AMD Radeon RX 6400 Tested on PCI-Express

First we need to identify at which PCIe slot the device is attached $ lspci grep -i nvme 08: Non-Volatile memory controller: Samsung

Slot configuration for Power H924 server The number of PCIe slots that are 4 x8 4 P1-C5, P1-C7, P1-C10, and P1-C11 PCIe Gen 4 x8 with x16 connector

pcie m2 slot A PCIe slot will not bottleneck the card But what CPU are you running? That might be a different story 6152021 EVGA_JacobF Nope

pcie x1 in x16 slot PCIe PCIe No PCIe Sold out Vertical GPU: up to 4 slots; horizontal GPU: 3 slots drive mounts