PCIe 4.0 vs. PCIe 3.0 GPU Benchmark

Recently we've been discussing PCI Express 4.0 and the role it plays with the new GeForce 30 series. We suspected there may be a small performance advantage with high-end parts such as the RTX 3080 and 3090 when using PCIe 4.0 over 3.0, something like a ~5% uplift. We took a very brief look at this in our day one review and found at most we were looking at just a 3% uplift, which honestly adds up to very little.Still we had planned to take a more in-depth look at PCIe performance with the RTX 3080, so that's what we're going to do today. We'll be looking at many different PCI Express configurations using the Ryzen 9 3950X on the X570 platform using MSI's X570 Unify motherboard, as well as the Intel Core i9-10900K on the Z490 platform using MSI's Z490 Unify. In both instances we're using 32GB of DDR4-3200 CL14 memory and the graphics card of choice is the RTX 3080 Founders Edition.For all practical purposes, we'll skip the talk about the PCI Express bus, the bandwidth available at each...