для видяхи же нужен 3.0. Потому на макс графе вполне может упираться в пропускную способность шины.
PCI-Express 3.0 x8 is just fine for this generation of GPUs, and so is PCI-Express 2.0 x16. You lose about 4% in performance at PCI-Express 2.0 x8 and PCI-Express 3.0 x4, but that's no deal breaker. If you're still gaming on a PCI-Express 1.1 platform, congratulations, your future-proofing has worked for many years, but it may now be time to upgrade.
HKLM/SOFTWARE/MICROSOFT/WINDOWS/CURRENTVERSION/POLICIES/EXPLORER
HIDESCAHEALTH=DWORD:00000000