Question Asus Z790-F Gaming Wifi II - does PCIe 5 x16 lane splitting occur?

[idoitz]

Hi folks,

Working on a new build after ~10 years.
I just got the "ROG Strix Z790-F Gaming Wifi II" Motherboard and a 12900KF (to avoid all the recent intel 13th/14th gen issues).
After reading a lot, I still can't get a clear answer as to whether or not using the CPU lane M.2 slot (M.2_1) will cause splitting of the GPU PCIe5 x16, making it run with x8.

Some places say yes, it will split GPU lanes to x8.
Other places say that because the CPU's PCIe4 x4 m.2 lanes are separate from the GPU PCIe5 x16 there is no "splitting" of the x16 lanes -> This is also aligned with Intel's documentation on CPU lanes for 12th/13th/14th gen [see here for example]

And of course Asus doesn't mention this topic in the manual at all...

Any ideas?
Thanks

 

[JohnBonhamsGhost]

of course Asus doesn't mention this topic in the manual at all

provide link to the manual.

if it is an issue, it will almost always be addressed in the manual's notes.
if not, then likely there's nothing to address.

 

[Lutfij]

This might be a worthwhile read.

 

[idoitz]

provide link to the manual.

if it is an issue, it will almost always be addressed in the manual's notes.
if not, then likely there's nothing to address.

https://dlcdnets.asus.com/pub/ASUS/...WEB.pdf?model=ROG STRIX Z790-F GAMING WIFI II

 

[idoitz]

This might be a worthwhile read.

Yeah, so that's the 2nd hypothesis I mentioned in my post, and it does seem to make sense.

If this is true for all mobos with CPU-based PCIe5 x16 + PCIe4 x4 M.2 (which also correlates to the available lanes on the 12th/13th/14th gen intel CPUs) then I guess this should also apply to my motherboard (I have the "Z970-F II" model).

Any idea if this would also be true for this board?