Keeping multi-GPU rigs cool?

r/LocalLLaMA
Generative AI AI Hardware

As a newbie to building computers, been having issues trying to figure out how to cool my rig. The problem is that as the heat gets shunted upwards, each card gets hotter than the last (eg 31C -> 38C -> 42C -> 44C. At load during things like video generation, the hottest card can reach close to 90C). Trying to search for answers online or via chatbots has been not very helpful, given the 3D nature of the problem and the unique nature of each person’s setup.