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Old RTX 3080 GPUs repurposed and modded for Chinese market as 20GB AI cards with blower-style cooling
(www.tomshardware.com)
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Blower fans are better if you want a bunch of cards in one system. Open air coolers dump too much of the hot air back into the case and are usually thicker. For non-gaming loads it's frequently better to have more cards at less than max speed.