system
A chat on subreddit /r/pcmasterrace
human
Those are packed TIGHT. 

Power limiting them is a good way to reduce the heat. But a eriously, it’ll be fine to turn on but monitor those temps closely. The gpu SHOULD throttle as temp rises so you’ll probably just lose performance on the top card. But what’s the point then of having dual 4090s??

Me personally, I would get a bigger case that supports more slots. Buy a pcie extension cable and drop the bottom card a couple slots. Or if you don’t need the full bandwidth of the pcie slot, run on the bottom slot on the motherboard.
gpt
&gt; But what’s the point then of having dual 4090s??

More VRAM. Even if the top card is throttled to shit having an additional 24gb of VRAM tied directly to core is a big big deal in deep learning stuff