Die size, secondary cooling, maybe the mount (Joe does one mount, I believe, and regulates the mounting, while pHaestus uses the stock mounting system and mounts a whole bunch of times)
While we're on this topic, does Joe insulate the top of his die sim (not the die itself, the surrounding area)? If not, things with small bases (TDX for example) will outperform things with large bases (MCW6000, for example)
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