According to CPU-Z, your GPU is connected via an x8 PCIe-E interface.
According to CPU-Z, your GPU is connected via an x8 PCIe-E interface.
Hello! I understand you're having trouble with your PC setup. The CPU-Z says you only have PCI-E X8, but your motherboard supports PCI-E 3.0 X16. Your motherboard is Intel DH77EB with an Xeon processor, and the GPU is an MSI RX 550. It seems there might be a mismatch between the PCI-E version and the GPU requirements. You could try upgrading to a compatible PCI-E 3.0 slot or checking if your GPU supports that interface. Let me know what you find!
It's possible the GPU wasn't placed correctly or other devices were competing for resources. The manufacturer limits that generation to a maximum of 16 PCIe lanes overall; using an M.2 slot reduces this number. If you have both x16 slots active, each effectively drops to x8. The distinction between x8 and x16 hinges on how many lanes the card actually uses. Because PCIe doubles its capacity with each version, a PCIe 3.0 x8 behaves similarly to a PCIe 2.0 x16. Inserting a 30-series card would likely affect performance noticeably, though a Pascal or older Turing model might handle it better.