Question About MSI X670 P Pro WiFi M.2 Slots

[Tomicolx]

Hi, I can't seem to find anywhere if an M.2 is inserted on the first slot (the one advertised as Gen 5) will reduce the number of lanes available to the first PCIe 4.0. It's currently running at PCIe 4.0 X16 with my 4080 and I don't want to loose performance.

Any help is appreciated.

 

[rgd1101]

first slot use cpu pcie lane the other are from chipset

 

[Tomicolx]

first slot use cpu pcie lane the other are from chipset

I know that, but using the CPU one, will it reduce the PCIE lanes for the x16 one?

 

[rgd1101]

what the cpu? most have 20 pcie lane

 

[Tomicolx]

what the cpu? most have 20 pcie lane

It's a Ryzen 7 7700x, I'm worried about the motherboard, because some of them do clarify that when another PCIE device is connected, the number of PCIE lanes available to the main one will get reduced to x8 instead of the normal x16

 

[rgd1101]

maybe on other motherboard, not this one