Dual 3090 build - question about motherboard choice & cooling

Hey guys! First timer here, I’m not sure if this is the right place for this sort of questions (posted on the GeForce forum yesterday and was told to try it here) but here it is:

I am looking to build a PC with Intel Xeon CPU and dual RTX 3090s for machine learning, and have some questions about the choice of motherboard and cooling issues related to the dual GPU build.

  • Does the type of fan in the individual GPU (e.g., founders edition, open air or blower style) matter for cooling? Or is it more of how they are oriented/separated and the overall airflow in the case? What’s your recommendation?

  • Are PCIe risers/extenders an effective way to physically separate the two GPUs to ensure adequate cooling?

  • About the choice of motherboards, something like Supermicro X13SRA-TF should work, right? Its spec. says “3 PCIe 5.0 x16 Slots, support up to 3 Single Width/2 Double Width/2 Triple Width GPU cards”, so I should be able to plug in two 3090s?

Thanks a lot!