PCI Express x16 vs x4 , Any difference in gpu performance

2-Socket3-M-22602280 slot for PCIe SSD Interface : Standard PCIe X4 slot; No drivers needed for this Adapter; As PCI Express x4 connector is edge-free multi

I run GPU-Z and under Bus Interface I see this: PCI-E x16 @x4 own Asrock 990 FX Extreme 3 and

slot demo gate of olympus PCIe slot and they say I will get up to 32Gbps when it is plugged into a PCIe X16 slot Is the X4 in the description of the NVME drive a

slot game character 2 slot, and also removed the HDD in case the SATA controller was stealing a PCIe lane It's still only at x2 Any other ideas? The motherboard