User report: M5 Max MacBook Pro’s PCIe 5.0 SSD reportedly tops 100°C under AI load

What happened

It has been reported that a user running AI workloads on an Apple M5 Max MacBook Pro saw SSD temperatures exceed 100°C, potentially becoming the system’s thermal bottleneck. The claim — first circulated on Reddit and picked up by Chinese tech site IT Home (IT之家) and Wccftech — centers on the new PCIe 5.0 NVMe drives Apple equipped in its 14‑inch and 16‑inch M5 Pro and M5 Max MacBook Pro models, which Apple says double read/write performance and push bandwidth to about 14.5 GB/s.

Technical details and user evidence

According to the Reddit poster (username “M5_Maxxx”), photos from the monitoring app TG Pro showed the SSD controller reaching roughly 106°C while the CPU and GPU reportedly stayed below 100°C, implying the SSD controller — not the NAND — was the hot component throttling overall performance. It has been reported that the user concluded the device’s real limiter was storage thermal headroom rather than the Apple silicon itself. Caveat: TG Pro sensor mappings and absolute thermal accuracy have been questioned by other users, so these specific temperature numbers remain unverified.

Reactions, DIY fixes and caveats

Some owners blamed Apple’s cooling design for insufficiently handling the higher-power PCIe 5.0 drives; others warned that adding conductive pads over NAND to move heat into the chassis — a recommended DIY hack — would make wrist and lap temperatures much hotter and could be impractical. The Reddit post did not clarify whether the machine was a 14‑inch or 16‑inch M5 Max unit, a detail that matters: larger chassis usually offer more thermal headroom. Apple has not publicly commented and it has been reported that no official firmware or hardware response has yet been announced.

Why it matters

On‑device AI workloads are stressing laptops in new ways. Faster PCIe 5.0 storage reduces I/O bottlenecks, but also concentrates heat in controller silicon inside ever‑tighter chassis. What should consumers do? Monitor temps when running heavy local models, and watch for firmware or software updates from Apple. The episode also underscores a broader industry pivot: as companies push more AI to endpoints amid complex global supply chains and regulatory pressures, thermal engineering is becoming as important as raw compute.