I got an OWC Express 1M2 precisely because of thermal fears. The heatsink is huge, but no fans. Only real issue is needing to be careful to not nudge the cables

I got an OWC Express 1M2 precisely because of thermal fears. The heatsink is huge, but no fans. Only real issue is needing to be careful to not nudge the cables. I also suspect that trying to stream larger LLM models from disk hammered the USB 4 connection too much - lead to system hangs, so now stream from the internal SSD instead.