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I'm in a similar situation to AP,  though running a regular 5900x in a ASRock x570 Pro4 mATX board, not an APU.


So my current thinking of running the GPU in the 4x (16 physical) slot (3rd one). Now usually that would be crazy talk. However since its gen 4.0 I'm guessing its similar in data rate to a 8x PCIe 3.0? And I also read that 8x 3.0 vs 16x 3.0 is kinda negligible affect on FPS for the GPU.


Soo.. is my thinking correct here? Can you actually run a new RTX 3080/RX 6800 in a 4x (4.0) slot and have it perform OK? (don't mind a few percent off of optimal). If so , that's really fantastic.


That way I could put the Hyper 4x card in slot one and give each NVME the full 4.0 4x it needs. Kinda imaging the glory of 4x2TB SN 850's on a 16x slot  and the insanity that would ensure :)


Kinda want to try the most dense crazy build possible in mATX and 18L.