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Hi @tonycstech,
I think it's fairly transparent, as per the manual. The motherboard firmware doesn’t distinguish between active devices and passive adapters when reallocating lanes; it will simply detect that the slot is in use. This will very likely be the same regardless of SKU vendor.
I would check bios and load defaults etc see what happens.
are you using GPU-z to verify? Check with CPU-z on the second page mainboard and run a test to see if its gimped at 8x.
you have nothing in the m.2 slots on the motherboard? Your using a SSD as your OS?
System specs please, thanks
GPU stuck in X8 no NVME drive
Just a suggestion! I could be wrong!
GPU Vertical/Horizontal installation: Is the computer case VGA slots and motherboard near a perfect 90-degree angle? That slight lift starts migrating towards the back of the PCIe slot and may cause X0, X2, X4 and X8. Do you have to use another instrument to remove your GPU instead of your index finger?
GPU horizontal/Vertical installation: Is your GPU sagging? Might need a GPU lift bracket.
I could be wrong!
Not sure why you wont just detail what specs your running CPU/GPU/HD+SSD+M.2/
Hard to determine bifurcation of CPU lanes and chipset lanes when we dont know anything other than u have any gpu installed and a 12900ks and a z690 hero.
Not sure if you have AIDA64 but if you download the one that came with the ASUS mobo, you can check exactly whats using what, for example
CPU 12900KS i already said that>
GPU does not matter, its Nvidia. I also said i tried another GPU, same thing.
I also tested PCIE lanes with a tester, they pass. all 16 lanes work on the top slot of the motherboard.
HDD NVME does not matter because problem exists even if none of them are plugged in at all.
I can run Linux from USB and confirm the issue.
Never heard of ADA so here it is. It says EXACTLY what i've been saying.
PCIE X16 is in X8 mode.
Other devices that are currently occupying PCIE lanes are NVME (4 lanes) and capture card (4 more) so total is 16.
Without NVME and capture card, same thing .,X8 only.
