Now here's a quick look at how the RTX 3080 performs on the Z490/10900K combo using PCI Express 3.0 x16 and x8 bandwidth. Intel Core i9-10900K PCI 3.0 vs PCIe 4.0 Benchmarks If anything this reduces the need for PCIe bandwidth as it lowers the frame rate. we're not sure what that's based on, but here are the DLSS + ray tracing numbers. We've also seen people claim ray tracing uses a lot more PCI Express bandwidth. Wolfenstein: Youngblood behaves similarly to Doom, so while we are seeing a reduction in performance with PCIe 3.0 x16, the margins are meaningless.įor those wondering, enabling a technology like DLSS doesn't change much, we're looking at similar margins to that of native performance. The threshold for PCIe 3.0 x8 in this title appears to be just over 300 fps, while x16 will allow for almost 360 fps and PCIe 4.0 x16 doesn't limit the 3950X, allowing for 368 fps on average. You'll often see the biggest performance differences at higher frame rates and this is because bus transfers are fairly consistent per frame regardless of resolution, meaning the frame rate is the primary driver of PCIe bandwidth. The Doom Eternal results are interesting because we're pushing really high frame rates in this title. We see virtually no difference between PCIe 3.0 and 4.0. We know that Resident Evil 3 isn't CPU sensitive at all, at least within reason and it doesn't appear very PCIe bandwidth sensitive either. In fact, we only start to see a reduction in frame rate with PCIe 3.0 x8. Horizon Zero Dawn has proven to be more PCIe sensitive than most other titles we've tested, but even here we're seeing very little difference between PCIe 3.0 and 4.0. Interestingly, it is again 1440p that takes the biggest hit, but we're only talking a 6% drop off for this unlikely configuration. Really nothing to see here.į1 2020 is yet another title that isn't noticeably impacted by PCI Express bandwidth and it's not until we drop down to PCIe 3.0 x8 that we see some kind of performance loss at 1440p and 4K. It's a similar story when testing with Rainbow Six Siege, we see an insignificant 2.5% performance drop off at 1080p when changing PCIe version from 4.0 to 3.0, and then a further 2% drop when switching to x8 bandwidth. In the unlikely scenario that you're running at PCIe 3.0 x8 on an X570 or B550 motherboard, there is a performance hit, particularly to the 1% low performance, where we see up to an 11% drop in frame rate at 1440p, though typically we're looking at more like a 7% dip in performance.ĭespite being a very visually impressive game, Shadow of the Tomb Raider doesn't eat up a lot of PCIe bandwidth and as a result we see virtually no change in performance, even when going from PCIe 3.0 x8 bandwidth right up to PCIe 4.0 x16 bandwidth. Starting with Death Stranding we see no real difference in performance between PCIe 4.0 and 3.0 when running at full bandwidth in the x16 mode. Ryzen 9 3950X PCI 3.0 vs PCIe 4.0 Benchmarks In both instances we're using 32GB of DDR4-3200 CL14 memory and the graphics card of choice is the RTX 3080 Founders Edition.įor all practical purposes, we'll skip the talk about the PCI Express bus, the bandwidth available at each mode or anything of the sort since we've gone over that previously, we'll assume you already know the details and we're mostly concerned about the numbers, so let's get to it. 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. 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 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. We suspected there may be a small performance advantage with high-end parts such as the RTX 30 when using PCIe 4.0 over 3.0, something like a ~5% uplift. Recently we've been discussing PCI Express 4.0 and the role it plays with the new GeForce 30 series.
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