Interface performance is significantly reduced compared to expectations.
Interface performance is significantly reduced compared to expectations.
I initially shared my experience on Reddit about PCIe 4.0. It seems it didn’t significantly impact my setup since my CPU caps at PCIe 3.0. I own a Qick 6750XT and according to CPU-Z, it’s not reaching its potential of x16 and 8GT/s as expected with PCIe 3.0. I was expecting higher performance due to the PCIe version but instead got x4. I checked my specs: 16 lanes for GPU, 4 for NVME, but adding an NVME reduced GPU lanes to 8. I installed NVMe and still saw only x4 output. Running games didn’t change much, so it might be a BIOS setting issue. I’m planning to list my components and screenshots of CPU-Z and GPU-Z for anyone who can assist. At the moment, upgrading my CPU isn’t feasible financially, but if possible, I’d consider a 5800X3D. For a motherboard, Asus Tuf B550M with Wi-Fi and a Ryzen 5 5600G would be ideal. My RAM is two 16GB modules at 3600MHz, plus one HDD, two SSDs, and an NVMe cooler with six fans.
PCIe 3.0 and 4.0 differences are minimal for most GPUs. The ones most impacted are those with just four lanes, like the RX 6500 XT. If your setup only has four lanes, it might be worth checking the motherboard details. It could relate to the CPU or possibly involve shared lanes with storage.
Top one from PDifolco, I looked before installing since I was aware it could happen. I understand that using an NVMe can cut the lanes in half with this CPU, which made my PC a nightmare to fix. The Bluetooth issue on this motherboard plus XMP problems from AMD really added to the chaos—lmao!
I understand an NVMe drive paired with this CPU lowers lanes from 16 to 8. The issue seems to be that I only have 4 RAM slots, possibly missing some details about the motherboard if it shares storage with other drives besides NVMe. I’ll recheck now; BIOS settings appear normal.
I verified the BIOS settings and noticed the auto mode was configuring my PCIe to RAID mode, operating at x4 speed. I opted for x8 or x8 mode, which functioned properly. I recalled that this particular motherboard/CPU seems to dislike auto mode for certain tasks.
It seems the second position doesn’t restrict my GPU but causes the NVMe to operate at PCIe 2.0 or 3.0 x2. It would be reversed too. Would the GPU limit NVMe performance, and could two lanes slow things down? Or is it worth it since I’m still getting solid results, especially with the GPU running at X8 now?
Verify the data rate you expect; even PCIe 2x2 delivers about 1GB/s, which won’t cause problems on an SSD except during massive file moves (it’s still close to double SATA). On the other hand, a PCIe 3.0 x4 connection on a GPU provides 4GB per second, and I think this could strain your GPU frequently.
I followed your suggestions and ended up with nearly identical speeds. In RND4K, my GPU ran at PCIe 3.0x16 initially, though my PC struggled at first. After a BIOS reset, everything functioned perfectly—though I had to reapply all the settings. It was likely worth it. I’m now checking performance in some games; Son of the Forest runs at 45fps in multiplayer and doubles in singleplayer. Hope this helps! Time to dive into Dark Ages next! Thanks a lot, really appreciate it.