Performance drop due to PCIe 4.0 x16 implementation
Performance drop due to PCIe 4.0 x16 implementation
You're considering the MSI MPG 650 CARBON WI-FI for your upcoming build alongside the 7800X3D. The PCI_E1, M2_2 and M2_3 slots share bandwidth, so PCI_E1 operates at x8 speed during M2_2 or M2_3 installations—useful if you later add more M.2 SSDs. Regarding performance, upgrading from X16 to X8 speeds won't cause a major drop in GPU performance.
It varies by graphics card. Typically it's around 1-2% drop in performance when switching to just 8 PCIe lanes instead of 16. In practice, this often means a slight reduction in frames per second during games.
You’ll enjoy ample bandwidth thanks to the PCIe 4.0 connection in the GPU, ensuring smooth performance without lag. The RTX 3080 handles PCIe 3.0 x16 just fine, matching up with PCIe 4.0 x8 capabilities.
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I found this product really interesting. It looks great, is affordable, and includes everything I need. Plus, it’s compatible with the latest AMD models.
Only when utilizing the 3rd or 4th M2 slot can this occur, and as noted by others, it won’t affect your GPU performance.
I don't have a 4090, but I'm using my 4070Ti at 4.0 x8 with the remaining two full-size slots for NVMe. I only saw a few hundred points drop in Cinebench 2024. If I let f@h run on the GPU it should still achieve around 13M PPD, which is quite solid.
Not according to the guide, PCI_E1, M2_2 and M2_3 all use the same bandwidth. PCI_E1 operates at 8x during device installation in M2_2 or M2_3 slots.
PCie4 x8 should suffice for the GPU without affecting its performance