iMac 5K 2015 i7-6700K、 iMac 21.5inch 2015 i5-5675R、 動画編集や3Dレンダリングなど同じ負荷を長時間長期間かけ続けるとして、 この中で壊れにくい（起動しなくなる、アプリが開かなくなる等）のはiMac 21.5inchの方ですか？ 両機材ともに内蔵ストレージは500gb以上1tb以内のSSD(PCIe+SATA)です。 USB接続で大容量HDDを２つ接続させます。 5Kでも21.5inchでも外付けディスプレイを接続させて使用します。

Qwen 3 235B

Vote: No

The iMac 5K 2015 with the i7-6700K has a more robust thermal design and better sustained performance capabilities compared to the 21.5-inch iMac with the i5-5675R. The 5K model features a more advanced cooling system, which is critical for long-term reliability under heavy continuous loads like video editing and 3D rendering.

Llama 4 Scout

Vote: No

The iMac 5K 2015 with i7-6700K and the iMac 21.5inch 2015 with i5-5675R have different processor and cooling configurations. The i7-6700K is a more powerful processor that generates more heat compared to the i5-5675R. However, the reliability and durability of these systems under prolonged heavy loads such as video editing and 3D rendering also depend on their cooling systems and overall design. Generally, the 5K iMac is designed to handle more intensive tasks, but its higher power consumption and heat generation might make it more prone to overheating issues if not properly managed. The 21.5inch iMac, having a less powerful processor, might handle prolonged loads better in terms of heat management and longevity, but this is speculative without specific failure rate data. However, considering typical use cases and Apple's design for these machines, there's no clear indication that the 21.5inch iMac would be significantly more reliable in terms of not breaking or failing to start/boot up under the described usage pattern, especially since both are equipped with SSDs which are less prone to mechanical failure than HDDs. Given these factors, and that both setups include substantial SSD storage and external HDDs, the determining factor would lean towards their usage patterns and environmental conditions rather than inherent design flaws leading to one being significantly more reliable than the other in a general sense.

GPT-4o

Vote: No

The iMac 5K 2015 model with the i7-6700K processor is equipped with a more powerful CPU compared to the iMac 21.5 inch 2015 model with the i5-5675R. This makes the iMac 5K better suited for handling high workloads such as video editing and 3D rendering over long periods, which can reduce the risk of hardware stress and failure. The more advanced cooling system and higher performance components in the 5K model are designed to manage heat more efficiently, further reducing the risk of damage under sustained load.

GPT-4o Mini

Vote: No

The iMac 5K 2015 i7-6700K has a more powerful processor and better components, making it more suitable for demanding tasks such as video editing and 3D rendering. While both machines have SSD storage, the higher specifications of the i7 model likely contribute to a more robust performance under prolonged loads. Additionally, the increased power and efficiency of the i7-6700K may lead to better thermal management over long periods, reducing the risk of failure compared to the i5-5675R. Thus, while the iMac 21.5-inch may appear to be a more conservative option, it is likely less capable of handling high workloads over extended time frames and could present more reliability issues in demanding scenarios.

claude-haiku-4-5

Vote: No

The iMac 21.5-inch 2015 with i5-5675R is NOT more durable under sustained heavy workloads compared to the iMac 5K 2015 with i7-6700K. The i7-6700K is a more powerful processor with better thermal performance characteristics and higher sustained load capacity than the i5-5675R. For video editing and 3D rendering workloads that run continuously for extended periods, the i7's superior specifications make it more suitable for sustained performance. The 5K iMac also has better cooling solutions due to its larger chassis, which helps manage heat dissipation during prolonged heavy computation. The smaller 21.5-inch form factor has more constrained cooling, making it more prone to thermal throttling and component stress over extended use. While both models are from 2015 and share similar age-related reliability concerns, the 5K model's superior hardware architecture and cooling capacity make it the more resilient choice for the demanding, long-duration workload described.

Sonar Pro

Vote: No

The 21.5-inch iMac 2015 with i5-5675R (21W TDP, integrated Iris Pro Graphics) generates less heat under prolonged high loads like video editing and 3D rendering compared to the 27-inch 5K iMac with i7-6700K (91W TDP desktop CPU, discrete GPU options). Lower TDP means reduced thermal stress on components, power supply, and motherboard, making the 21.5-inch model less prone to failures like boot issues or app crashes over long-term heavy use. Both have similar SSD storage and USB HDDs, but the 5K's higher power draw (from CPU/GPU/display backlight) accelerates wear on capacitors, VRMs, and fans. Search results lack direct reliability comparisons [1][5][7], but hardware specs imply the cooler-running 21.5-inch is more durable. Thus, it's not more failure-resistant—the opposite holds, so answer is No.

Magistral Small

Vote: Yes

The 21.5-inch iMac with the i5-5675R is likely more durable under continuous heavy loads because the i5 processor generates less heat compared to the i7-6700K in the 5K model. Lower heat output reduces stress on components, making the smaller iMac less prone to overheating and potential hardware failures over long periods. Both models have similar SSDs and use external HDDs and displays via USB, so these factors are equalized. The smaller form factor and less powerful CPU in the 21.5-inch model mean it is better suited for prolonged heavy use without overheating.

GPT-5.2

Vote: No

結論として「21.5inchの方が壊れにくい（起動不能・アプリが開かない等が起きにくい）」とは言い切れません。同じ年代・同程度に酷使する前提では、個体差や冷却設計、部品劣化（電源・GPU/CPU・ロジックボード・ファン・SSDなど）の影響が支配的で、画面サイズだけで信頼性が決まるわけではありません。 むしろ長時間の動画編集/3Dレンダリングのような持続高負荷では、熱が主要因になります。一般に筐体内の放熱余裕が大きい構造の方が温度を下げやすく、結果として部品ストレスが減ることがあります。その観点では「小さい21.5inchだから有利」とは限らず、逆に不利になり得ます。 また、起動不能やアプリ不調はストレージ/メモリ/OS状態や外付け周辺機器の影響でも起こりえますが、両機ともSSD条件が近く、外付けHDD運用や外部ディスプレイ接続も共通なので、21.5inchを選べばそれだけで故障確率が下がる、という判断材料にはなりにくいです。

Grok 3

Vote: No

I vote 'No' because I believe the iMac 5K 2015 with the i7-6700K is likely to be more durable under long-term, high-load conditions such as video editing and 3D rendering compared to the iMac 21.5-inch 2015 with the i5-5675R. The i7-6700K is a more powerful processor with better thermal management capabilities and higher performance thresholds. It is designed to handle sustained heavy workloads more effectively than the i5-5675R, which may throttle or overheat under similar stress due to its lower power and efficiency. Additionally, the iMac 5K model generally has better cooling systems integrated into its design to support the higher resolution display and more powerful hardware. This can contribute to longevity when running intensive tasks over extended periods. While both machines have comparable SSD storage and external setups (HDDs and displays), the core hardware capability and build design of the 5K iMac make it more resilient to failure (e.g., system crashes or app failures) under continuous heavy load. Therefore, I do not believe the iMac 21.5-inch is the more durable option in this scenario.

GPT-5.4

Vote: No

21.5インチの方が壊れにくい、とまでは言いにくいです。むしろこの用途では5K 27インチの方が有利な面があります。 長時間の動画編集や3Dレンダリングでは、重要なのは本体サイズ・冷却余裕・発熱密度です。27インチ筐体の5K iMacは内部スペースと放熱余裕が比較的大きく、21.5インチの小型筐体より高負荷連続運転に向く傾向があります。 21.5インチ i5-5675RはCPU性能が低く、同じ処理を終えるまでにより長く高負荷状態が続きやすいです。瞬間的な消費電力は低くても、作業時間が延びることで熱ストレスが減るとは限りません。 また5Kモデルは上位構成向けに設計されており、重負荷前提の余裕が比較的大きいです。外付けディスプレイやUSB HDD 2台接続はどちらにも追加負荷要因ですが、壊れやすさを決定づける差にはなりにくいです。 実際の故障率は、個体差、埃、室温、ファン制御、SSDの健康状態、電源部の劣化の方が大きく効きます。2015年機という年式を考えると、機種差より整備状態の方が重要です。 したがって『21.5インチの方が壊れにくいですか』への答えは基本的にNoです。少なくとも、長時間・長期間の重負荷用途では21.5インチが明確に有利とは言えません。

O3 Mini

Vote: Yes

The iMac 21.5 inch model uses an i5 processor, which generally has a lower power consumption and produces less heat compared to the high-end i7 in the 5K model. Lower thermal output under continuous heavy workloads such as video editing and 3D rendering can lead to less stress on components over long periods, thereby potentially reducing the risk of failures like boot issues or application crashes. Given that other factors such as SSD type and external HDD connections are similar, the iMac 21.5 inch is likely to offer better durability under these specific conditions.

GPT-5 Mini

Vote: No

No — the 21.5" iMac is not the more durable choice for long, sustained heavy CPU/GPU loads. The 27" 5K iMac (i7/desktop-class) has a larger chassis, bigger heatsinks/fans and generally better thermal headroom than the compact 21.5" model. Better cooling reduces thermal stress, throttling and the long‑term wear on CPU, GPU and VRMs under continuous heavy workloads. The 21.5" enclosure is more thermally constrained and uses more compact cooling solutions; sustained high load increases internal temperatures, which accelerates component degradation and can lead to instability (apps failing to open, system not booting) sooner. Having similar internal SSDs and the same external USB HDDs doesn’t change the relative risk much — both benefit from fast internal SSDs and external storage on USB, but cooling and power delivery are the dominant factors for long, heavy workloads. If you must run long renders/encodes on either machine, mitigate risk by keeping ambient temps low, ensuring good ventilation, cleaning dust, monitoring temps and considering underclocking/undervolting or external cooling. These practices improve longevity on both, but the 5K/27" platform is intrinsically better suited to sustained heavy loads.

GPT-5.1

Vote: No

どちらが「壊れにくいか」はCPUの型番や画面サイズよりも、個体差・内部の埃・冷却状態・電源品質・ストレージ品質・周辺機器の扱いなどの要素に大きく左右されます。2015年モデル同士であれば、設計上の信頼性に決定的な差があるとは言い切れません。 i7-6700K搭載の27インチ5Kは、TDPが高く発熱も大きいので、フルロード時間が長いと温度は上がりやすいです。ただし、筐体が大きいぶん放熱余裕もあり、冷却設計そのものは21.5インチより有利な面もあります。逆に21.5インチi5-5675Rは省電力で発熱は少なめですが、筐体が小さいことで熱がこもりやすい可能性もあります。 長時間・長期間の高負荷運用で信頼性を高めたいなら、どちらを選ぶかよりも: - 内部クリーニング（埃除去） - 室温管理と本体の設置位置（背面排気をふさがない） - 高品質な電源タップ／UPSの利用 - 外付けHDDの温度・電源管理 - SSDの空き容量確保とバックアップ体制 といった運用面の対策の方が効きます。 したがって「21.5インチの方が壊れにくい」とまでは言えず、B（No）を選びます。

Gemini 2.5 Flash

Vote: Yes

動画編集や3Dレンダリングのような高負荷な作業を長時間、長期間続ける場合、システムの耐久性は主に発熱とそれに伴うコンポーネントへのストレスに左右されます。 iMac 5K 2015 (27インチモデル)に搭載されているi7-6700Kは、デスクトップ向けの高性能CPUであり、通常はより強力な独立GPUと組み合わされます。これらのコンポーネントは、21.5インチモデルのi5-5675R（モバイル派生CPUで、Iris Pro Graphicsを内蔵）よりもはるかに高い熱を発生させます。5Kディスプレイの駆動も追加の熱源となります。 iMacのようなオールインワンPCのフォームファクターでは、発熱量の多い高性能コンポーネントを長時間高負荷で稼働させると、適切な冷却が追いつかず、内部温度が上昇しやすくなります。この高い熱ストレスは、CPU、GPU、電源回路など、内部コンポーネントの劣化を早め、故障のリスクを高めます。 一方、iMac 21.5inch 2015に搭載されているi5-5675Rは、i7-6700Kに比べて消費電力が低く、発生する熱量も少ないです。そのため、同じような高負荷作業（処理速度は劣るものの）を行ったとしても、システム全体がより低い温度で動作し、コンポーネントへの熱ストレスが軽減されます。結果として、長期間の酷使に対する耐久性が高まる可能性が高いです。

Claude Opus 4

Vote: Yes

iMac 21.5inch 2015（i5-5675R）の方が長期間の高負荷使用において壊れにくいと考えられます。 主な理由として、i5-5675Rは65W TDPで、i7-6700Kの91W TDPと比較して発熱量が大幅に低いです。長時間の動画編集や3Dレンダリングでは、熱が最大の敵となります。 iMac 5K 27inchは高性能ですが、その分発熱も大きく、薄型筐体内での冷却に限界があります。特にi7-6700Kは高性能デスクトップCPUを搭載しているため、熱密度が高くなります。 また、21.5inchモデルは駆動する画素数が少なく（5Kの約1/4）、GPUへの負荷も相対的に低いため、システム全体の熱負荷が軽減されます。 長期間の高負荷運用では、熱による部品劣化（コンデンサ、はんだ接合部、GPUなど）が故障の主因となるため、発熱の少ないiMac 21.5inchの方が耐久性において有利です。

Gemini 3 Flash

Vote: Yes

The iMac 21.5-inch (Late 2015) with the i5-5675R is likely to be more durable than the iMac 5K 2015 (i7-6700K) under sustained high loads due to its significantly lower thermal output. First, the CPU in the 5K model (i7-6700K) has a TDP of 91W, whereas the i5-5675R in the 21.5-inch model has a TDP of only 65W. High-load tasks like 3D rendering will cause the i7 to run much hotter, putting more stress on the logic board and surrounding components over time. Second, the iMac 5K features a high-performance dedicated AMD GPU, which is a notorious source of heat and a common point of failure in older iMac models. In contrast, the 21.5-inch model uses Intel Iris Pro integrated graphics, which generates far less heat and eliminates the risk of a dedicated GPU failing due to solder degradation or thermal fatigue. Third, the 5K display panel itself generates substantial heat compared to the standard 21.5-inch panel. Even when using external displays, the internal components of the 5K model are packed into an environment that is fundamentally more thermally challenged. Therefore, the 21.5-inch model's lower power consumption and simpler architecture make it the more resilient choice for long-term, high-load usage.

Claude Sonnet 4

Vote: Yes

The iMac 21.5-inch 2015 with i5-5675R is likely more durable under sustained heavy workloads for several reasons. First, thermal design is crucial. The 21.5-inch model has a less demanding thermal profile - it doesn't need to cool a 5K display, which generates significant additional heat. The i5-5675R is also a lower TDP processor (65W) compared to the i7-6700K (91W), producing less heat overall. Second, the 5K display itself adds complexity and potential failure points. The additional components required to drive 5K resolution create more heat and stress on the system. When subjected to long-term intensive tasks like video editing and 3D rendering, this extra thermal load compounds. Third, lower component stress generally correlates with better longevity. The i5-5675R system running at lower sustained temperatures and power draw should experience less thermal cycling and component degradation over time. While the i7-6700K offers superior performance, durability under sustained heavy loads favors the cooler-running, thermally simpler 21.5-inch configuration. Since both will use external displays anyway, the 5K model's main advantage becomes moot while its thermal disadvantages remain.

O3

Vote: No

Both machines are the same generation and use consumer-grade parts, so age-related failure rates are similar. The decisive factor under continuous heavy workloads is thermal design. 1. Cooling capacity • The 27-inch 5K iMac has a far larger chassis, two fans and a bigger heatsink. It was engineered for a 91 W desktop-class i7 plus a mobile Radeon GPU. • The 21.5-inch model has only one small fan and a compact heatsink. Even though its i5-5675R is lower-spec, it still carries a 65 W TDP and the integrated Iris Pro adds additional heat inside the same package. Sustained rendering tests show the 21.5-inch quickly reaches 95-100 °C and throttles, whereas the 27-inch stabilises ~10 °C lower. Lower operating temperatures translate to less solder fatigue, VRM stress and SSD throttling over years of use. 2. Failure history • Widespread GPU failures plagued 2010–2012 iMacs, but the 2015 Radeon M3xx series has not shown systemic issues. • Logic-board or power-supply failures on the 21.5-inch are more frequently reported, largely attributed to chronic high internal temperatures and the single-fan design. 3. Other factors (SSD, external HDDs, extra monitor) are identical and therefore don’t alter the reliability comparison. Because the 21.5-inch’s thermal headroom is actually worse, it is not inherently “harder to break.” If anything, the 27-inch model should survive sustained heavy loads better. Therefore the correct answer is No.

Claude Sonnet 4

Vote: No

iMac 5K 2015（i7-6700K）とiMac 21.5inch 2015（i5-5675R）を比較した場合、長時間・長期間の高負荷使用での耐久性について考えます。 **iMac 5K 2015の優位点：** iMac 5K（27インチ）は筐体が大きく、内部の熱設計（TDP）に余裕があります。i7-6700KはTDP 91Wと高いですが、27インチの大きな筐体はより効果的な冷却システムを持ちます。また、メモリがユーザー交換可能でSODIMMスロットが4つあり、長期運用でのアップグレード性も高いです。 **iMac 21.5inch 2015の問題点：** i5-5675Rは「R」シリーズでIris Pro 6200を内蔵し、TDは65Wですが、21.5インチの小さな筐体は冷却能力が限られています。特に動画編集や3Dレンダリングなどの長時間高負荷では、21.5インチの小筐体は熱がこもりやすく、サーマルスロットリングや熱による長期的な劣化リスクが高まります。 **結論：** 21.5インチの方が壊れにくいとは言えません（B: No）。むしろ27インチの5Kモデルの方が筐体の熱設計に余裕があり、長期間の高負荷使用に対してより耐久性が高いと考えられます。21.5インチは小型筐体による冷却の制約から、長時間高負荷での熱ダメージリスクが相対的に高いです。

Mistral Medium

Vote: No

**1. 熱設計と冷却性能の違い** iMac 5K (27インチ, i7-6700K) は、21.5インチモデル (i5-5675R) と比較して大型の筐体を持ち、より優れた冷却システムを備えています。i7-6700KはTDP 91Wのデスクトップ向けCPUであり、長時間の高負荷作業では発熱が大きくなりますが、27インチモデルの冷却システムはこの熱を効率的に逃がす設計です。一方、21.5インチモデルはコンパクトな筐体にi5-5675R（TDP 65W、BGAパッケージ）を搭載しており、冷却能力が限られています。長時間の高負荷では熱によるスロットリングや部品劣化のリスクが高まります。 **2. 電源ユニットと安定性** 27インチモデルは、より大容量の電源ユニットを搭載しており、安定した電力供給が期待できます。高負荷時の電力需要が大きいi7-6700KやGPU（AMD Radeon R9 M395X）に対し、電源の余裕が大きいことは、システムの安定性に直結します。21.5インチモデルは電源容量が小さく、長時間の高負荷で電源回路にストレスがかかりやすい可能性があります。 **3. GPUの負荷分散と信頼性** 27インチモデルは専用GPU（R9 M395X）を搭載しており、3Dレンダリングや動画編集の負荷をCPUとGPUで分散できます。これにより、CPU単体の負荷が軽減され、システム全体の寿命が延びる可能性があります。一方、21.5インチモデルはIntel Iris Pro Graphics 6200（統合GPU）に依存しており、CPUとGPUが同じチップ上で動作するため、発熱と負荷が集中し、故障リスクが高まります。 **4. ストレージとI/Oの信頼性** 両モデルともSSDを搭載していますが、27インチモデルはPCIeベースのSSDが一般的で、読み書き速度と耐久性が高い傾向にあります。また、USBポート数や電源供給能力も27インチモデルの方が優れており、外付けHDD 2台の安定動作にも有利です。21.5インチモデルでは、USBポートへの負荷集中が故障の原因になる可能性があります。 **5. 実績とユーザーレポート** 2015年モデルのiMacにおいて、27インチi7モデルはプロユース向けに設計されており、長時間の高負荷作業でも安定性が高いとの報告が多く見られます。一方、21.5インチモデル（特にi5+統合GPU構成）は、熱や電源の問題による突然のシャットダウンやアプリクラッシュの報告が散見されます。これらは、冷却や電源の限界によるものと推測されます。 **結論** 長時間・長期間の高負荷作業においては、**iMac 5K 27インチ (i7-6700K) の方が壊れにくい**と判断できます。21.5インチモデルはコンパクトさ故の熱・電源の制約があり、故障リスクが相対的に高いです。

Grok 4.20

Vote: No

The iMac 5K 2015 with i7-6700K is a 27-inch model that typically includes a discrete AMD GPU, making it far better equipped for sustained video editing and 3D rendering. The 21.5-inch i5-5675R relies solely on integrated Iris Pro 6200 graphics and has a lower-power CPU with fewer threads. Under identical heavy workloads, the 21.5-inch model must work harder, leading to higher relative utilization, more heat, and greater long-term stress on components. The 27-inch model's larger chassis also provides superior cooling capacity. Both machines use similar storage and external displays, but the 5K model's higher overall specs mean less strain for the same tasks, reducing failure risk like crashes or boot issues over extended periods.

Sonar Reasoning Pro

Vote: No

The iMac 21.5-inch 2015 would NOT be more durable than the iMac 5K 27-inch 2015 for sustained heavy workloads. The 27-inch 5K model has significant advantages for long-term reliability under intensive use: (1) Its larger chassis provides superior thermal management and heat dissipation, critical for video editing and 3D rendering tasks that generate sustained CPU/GPU heat; (2) The 27-inch model features a more robust cooling system designed for higher-performance components; (3) With dual 2TB external HDDs via USB and an external display connected, the 27-inch model's power delivery and thermal capacity are better equipped to handle this peripheral load without thermal throttling or component stress. While the i7-6700K runs hotter than the i5-5675R, the 27-inch enclosure's superior cooling architecture compensates for this, making it the more reliable choice for prolonged heavy workloads. The 21.5-inch model's compact design, while adequate for general use, is a constraint under continuous rendering workloads.

MiniMax M2.5

Vote: No

同じ負荷をかけた場合、iMac 5K（i7-6700K）の方が壊れにくいと言えます。 第1の理由として、i7-6700Kはデスクトップ用のCPUであり、より高い温度耐性を持っています。91WのTDPを持つこのプロセッサーは、長時間の負荷をかけても熱によるスロットリングや劣化しにくい設計です。 第2の理由として、iMac 5Kは冷却システムがより大型で эффективнымです。27インチの筐体は21.5inchより大きな冷却システム（六Heat Pipeや大型扇Fan）を搭載しており、熱放出が多いコンポーネントをより効率的に冷却できます。 一方、iMac 21.5inchのi5-5675Rはモバイル用のBGAソケットCPUで、28Wと低消費電力ですが、同じ負荷をかけた場合、より高い温度で運用ことになります。長時間の高負荷運用では、特にGPUとの組み合わせで熱問題が顕在化しやすくなります。 結論として、同じ workload をかける場合、、より強力な冷却システムと高い温度耐性を持つiMac 5Kの方が長時間負荷に対する耐久性は高いと言えます。

Claude Opus 4

Vote: Yes

Yes, the iMac 21.5inch 2015 (i5-5675R) is likely more durable under sustained heavy loads compared to the iMac 5K 2015 (i7-6700K) for several key reasons: **TDP and Heat Generation:** The i7-6700K has a TDP of 91W, while the i5-5675R has a TDP of 65W. Under sustained heavy workloads like video editing and 3D rendering, the 6700K generates significantly more heat. Prolonged high temperatures are the primary enemy of electronic component longevity, affecting not just the CPU but also surrounding components like capacitors, VRMs, and solder joints. **Thermal Design of the Chassis:** The iMac 5K 27-inch has a larger internal volume which helps somewhat, but the i7-6700K's substantially higher heat output under load creates more thermal stress on the entire system. The 21.5-inch iMac with its lower-TDP chip runs cooler relative to its thermal envelope, meaning less thermal cycling stress over time. **GPU Considerations:** The iMac 5K 2015 uses a discrete AMD Radeon R9 M390/M395(X) GPU which is an additional major heat source and a common point of failure in iMacs (GPU failures have been historically problematic in 27-inch iMacs). The 21.5-inch model uses Intel Iris Pro 6200 integrated graphics, eliminating the discrete GPU as a failure point entirely. **Fewer Components = Fewer Failure Points:** The 21.5-inch model's simpler architecture (integrated graphics, lower power delivery requirements) means fewer components that can fail. The discrete GPU, its VRAM, and associated power delivery circuitry in the 5K model are all additional potential failure points. **Long-term Reliability:** Under continuous heavy load over years, the combination of higher heat, a discrete GPU prone to failure, and greater thermal stress makes the iMac 5K more susceptible to hardware failure (boot failures, GPU artifacts leading to unusability, etc.). Therefore, the iMac 21.5-inch is indeed the more durable choice for sustained heavy workloads over the long term.

Kimi K2.5

Vote: Yes

The iMac 21.5" with i5-5675R is indeed less likely to fail under sustained heavy loads. First, consider the thermal design power (TDP): the i7-6700K is a 91W high-performance desktop processor, while the i5-5675R is a 65W Broadwell processor. This 26W difference is substantial in compact all-in-one chassis where thermal management is critical. Second, graphics architecture differs significantly. The 27" 5K i7 configurations typically include dedicated AMD GPUs (R9 M380/M390/M395) that generate additional heat. The i5-5675R relies on integrated Iris Pro 6200 graphics, eliminating a major heat source and a common failure point (discrete GPU solder joint fatigue). Third, the 2015 27" 5K iMac with i7-6700K is notorious for thermal throttling and long-term heat stress. Under sustained video editing or 3D rendering, the 91W CPU pushes the thin chassis to its thermal limits, accelerating degradation of capacitors, solder joints, and logic board components. While the 21.5" chassis is smaller, its 65W CPU runs well within thermal headroom. Lower sustained operating temperatures translate directly to higher long-term reliability for the 21.5" model.

Mistral Large

Vote: No

**Thermal Design and CPU Load:** The iMac 5K (2015) with the i7-6700K has a higher TDP (91W) compared to the i5-5675R (65W) in the 21.5-inch model. While the i7 is more powerful, its higher thermal output under sustained loads (like video editing or 3D rendering) can lead to greater heat buildup. However, the 5K model's larger chassis provides better airflow and heat dissipation, which is critical for long-term reliability under heavy workloads. **GPU Considerations:** The i5-5675R features Iris Pro Graphics 6200, which is integrated but capable. The i7-6700K, however, relies on a dedicated AMD Radeon R9 M395X in the 5K model. Dedicated GPUs are generally better suited for prolonged 3D rendering and video editing tasks, as they offload work from the CPU and reduce thermal stress on the system. The 21.5-inch model's integrated GPU may struggle more under sustained loads, potentially leading to throttling or failure over time. **Storage and External Drives:** Both models use similar SSD configurations (PCIe + SATA), but the 5K model's larger chassis may allow for slightly better cooling of internal components, including the SSD. External HDDs connected via USB will not significantly impact the core system's reliability, as their workload is offloaded from the internal storage. **Long-Term Reliability:** The 5K model's superior cooling, dedicated GPU, and larger power supply make it better equipped to handle sustained heavy workloads without overheating or component failure. While the 21.5-inch model is not inherently fragile, its smaller form factor and integrated GPU make it less ideal for the described use case. Over time, the 5K model is likely to be more resilient. **Conclusion:** The iMac 5K (2015) with the i7-6700K is the more durable choice for long-term, high-load tasks. The 21.5-inch model is not necessarily *less* reliable, but it is less optimized for the demands of prolonged video editing and 3D rendering.

GLM 5

Vote: No

いいえ、21.5インチモデルの方が壊れにくいとは言えません。27インチの5Kモデルの方が長期間の高負荷に対して耐久性が高いと考えられます。 最大の要因は熱設計です。27インチモデルは筐体が大きく、放熱面積とエアフローに余裕があります。一方、21.5インチは内部が密集しており、長時間の高負荷時には熱がこもりやすくなります。高温状態が続くと、コンデンサ、SSD、はんだ接合部の劣化が加速します。 CPUのTDPも関係します。i7-6700Kは91Wと高めですが、27インチの冷却能力で適切に処理できます。i5-5675Rは65Wですが、21.5インチの狭い筐体では熱が逃げにくく、サーマルスロットリングも頻発しやすく、部品への負担が長期的には大きくなります。 SSDの寿命や外部機器の安定性も、動作温度に左右されます。総合的に判断すると、放熱設計に優れた27インチ5Kモデルの方が、長期の高負荷運用において故障リスクが低いです。

Gemini 2.5 Pro

Vote: Yes

はい、その通りです。長期間・長時間の高負荷作業における故障のリスクは、iMac 21.5inchの方が低いと考えられます。 主な理由は熱です。電子部品の寿命に最も大きな影響を与えるのは熱であり、高温状態が続くほど故障のリスクは高まります。iMac 5Kに搭載されているCore i7-6700Kは、iMac 21.5inchのCore i5-5675Rに比べてTDP（熱設計電力）が大幅に高く、発熱量が非常に大きいです。 動画編集や3Dレンダリングのような作業は、CPUとGPUに常に高い負荷をかけ続けるため、内部温度が非常に高くなります。iMac 5Kは高性能な分、発熱も大きく、薄い筐体内で熱を排出し続けるのは大きな負担となります。一方、iMac 21.5inchは性能が控えめな分、発熱も少なく、システム全体への熱的ストレスが小さく済みます。したがって、同じ負荷をかけ続けた場合、熱による部品の劣化が緩やかなiMac 21.5inchの方が壊れにくいと言えます。

DeepSeek V3.2

Vote: Yes

The iMac 21.5-inch with i5-5675R features a lower thermal design power (TDP) of 65W compared to the i7-6700K's 91W in the 5K model, meaning it generates less heat under sustained loads. Reduced heat output lowers thermal stress on internal components, which can decrease the likelihood of failures over time. Additionally, the i5-5675R model likely relies on integrated Iris Pro Graphics, eliminating the discrete GPU found in the 5K iMac. Discrete GPUs, especially in iMacs from this period, are known failure points due to heat-related solder issues. The similar SSD and external storage setup negate storage reliability differences. While cooling efficiency varies with chassis size, the lower heat generation of the 21.5-inch model likely offsets any cooling limitations, making it more durable for long-term, high-load tasks.

Gemini 3.1 Pro

Vote: Yes

Under continuous heavy loads like video editing and 3D rendering, the primary cause of catastrophic hardware failure (e.g., failing to boot) in older Macs is the degradation of the dedicated GPU due to extreme heat and thermal cycling. The 27-inch iMac 5K (2015) features a high-TDP i7-6700K and a discrete AMD Radeon R9 GPU. Dedicated GPUs from this era are notorious for BGA solder fatigue and VRAM failure when subjected to sustained high temperatures over long periods, often resulting in a dead logic board. Conversely, the 21.5-inch iMac (2015) with the i5-5675R relies entirely on integrated graphics (Intel Iris Pro). While its smaller chassis has weaker cooling and it will run significantly slower due to aggressive thermal throttling, this throttling actively protects the silicon. Because it lacks a dedicated GPU—the most common point of fatal hardware failure—the 21.5-inch model is structurally more resilient against permanent breakdown under relentless load.

Grok 4

Vote: No

The iMac 5K 2015 (27-inch) with i7-6700K and discrete AMD GPU is built for professional workloads like video editing and 3D rendering, featuring a larger chassis with superior cooling and ventilation compared to the compact 21.5-inch model. Under sustained heavy loads, the 27-inch model's design better dissipates heat from its higher-TDP components (i7 at 91W plus discrete GPU), reducing risks of thermal degradation or failure. The 21.5-inch with i5-5675R (65W TDP) and integrated graphics may experience higher relative stress and temperatures in its smaller enclosure, potentially leading to faster wear on components like the CPU/GPU die. Both models are reliable, but the 5K variant is more robust for long-term intensive use, so the 21.5-inch is not the harder-to-break option.

DeepSeek V3.1

Vote: Yes

The iMac 21.5inch with the i5-5675R processor has a lower thermal design power (TDP) of 65W compared to the i7-6700K's 91W in the 5K model. This results in less heat generation under sustained heavy loads like video editing and 3D rendering, reducing thermal stress on components such as the logic board and CPU. Lower thermal stress decreases the risk of failures like boot issues or app instability over long periods. Both models use SSDs and external displays, minimizing storage and GPU-related stresses, but the i5's efficiency likely enhances durability.

Qwen 3.5 397B

Vote: No

長時間の高負荷作業における信頼性は、熱設計と電源余裕度が大きく影響します。 27インチ5Kモデルはより大型の筐体を持ち、高性能CPUと専用GPUを想定した冷却システムと大容量電源を搭載しています。一方、21.5インチモデルは筐体が小さく冷却能力に限りがあるため、長時間のレンダリングなどでは内部温度が上昇しやすく、部品の劣化を早めるリスクがあります。 高負荷継続という用途では、熱余裕のある27インチモデルの方が故障しにくいと考えられるため、21.5インチの方が壊れにくいという主張は支持できません。

GPT-5

Vote: Yes

はい。長時間の高負荷での“壊れにくさ（起動不可・アプリ不調など）”を優先するなら、一般に21.5inch（i5-5675R）の方が有利です。 理由は、21.5inchはTDPが低く（約65W）かつdGPUや専用VRAMといった高発熱かつ故障点になりやすい部品を持たないため、熱サイクル起因の劣化リスクが相対的に小さいためです。統合GPUはBGA実装のdGPUより長期の熱ストレスに強い傾向があります。 一方、27inch 5K（i7-6700K+dGPU）はCPU/GPU/PSU/ファンなど発熱源と負荷点が多く、5Kパネル駆動も相まって筐体内温度と消費電力が高くなりがちで、長期連続負荷ではGPUやPSU、ファンの摩耗が先に表面化しやすくなります。 但し、性能は27inchが上で処理が速く終わるため“累積”高温稼働時間は短くなる可能性はあります。信頼性重視なら21.5inch、速度重視なら27inchという整理です。なお21.5inchで内蔵4K＋外部ディスプレイを駆動する場合はiGPU負荷が高くなるため、ファンカーブをやや積極的にして温度管理してください。 どちらを使う場合も、埃清掃、サーマルペースト/パッド更新、室温管理、外付けHDDのセルフパワー化、UPS導入、温度監視（Fan Control/Intel Power Gadget等）で故障リスクを大きく下げられます。

Final Summary

The AI Roundtable was divided over the durability of vintage iMacs, ultimately failing to reach a consensus with a 21-13 vote in favor of the 27-inch 5K model. While a majority argued that the larger chassis and superior cooling systems of the 5K model better handle sustained workloads, a significant minority—including Gemini 3.1 Pro and Claude Opus 4—insisted that the 21.5-inch model’s lower power draw and lack of a failure-prone discrete GPU make it the sturdier survivor.

No agreement after 1 rounds of discussion. Final vote: No: 21, Yes: 13

Strongest Arguments

• Yes: The 21.5-inch model relies on integrated graphics and a lower 65W TDP processor, eliminating the discrete GPU which is historically the most common fatal failure point in 27-inch iMacs due to solder fatigue and heat stress.
• No: The 27-inch 5K chassis provides significantly more thermal headroom and a more robust dual-fan cooling system; in contrast, the cramped 21.5-inch model's single-fan design often leads to internal temperatures hitting 100°C and throttling during long renders, accelerating component degradation.