Question gen4 m.2 with 16x 4080 vs gen5 m.2 with 8x 4080

[egodmer]

Hello, I am upgrading my pc. I am wondering if ordering a gen5 M.2 drive with gen5 m.2 16x motherboard would be best. I know that if I plug in a gen5 in the first m.2 slot (the gen m5 16x one) then the PCIe port for the graphic card will drop to 8x. Will that impact my fps. I am using an rtx 4080 in 4k.

So basically gen4 m.2 with 16x 4080 vs gen5 m.2 with 8x 4080

 

[SkyNetRising]

I know that if I plug in a gen5 in the first m.2 slot (the gen m5 16x one) then the PCIe port for the graphic card will drop to 8x.

What model motherboard?

 

[egodmer]

If I am not mistaken all intel motherboard with the z790 chipset are like that. I am probably going to buy the rog strix z790-e gaming but not sure yet.

 

[SkyNetRising]

Will that impact my fps. I am using an rtx 4080 in 4k.

It would impact fps at resolutions 1080p, 1440p.
At 4k resolution impact would be minimal.

Here's review with 4090 PCIE performance scaling. 4080 would have similar impact.

NVIDIA GeForce RTX 4090 PCI-Express Scaling

The new NVIDIA GeForce RTX 4090 is a graphics card powerhouse, but what happens when you run it on a PCI-Express 4.0 x8 bus? In our mini-review we've also tested various PCI-Express 3.0, 2.0 and 1.1 configs to get a feel for how FPS scales with bandwidth.

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