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Last edited by Vinouch on 23 September 2020 at 1:46 pm UTC
For reference, check the Expansion Options section here.
If your hardware does provide a way to set this manually, it would likely be somewhere in the (UEFI) bios configuration panel. On my Asus MB all the relevant settings are in Advanced -> Onboard Devices Configuration, but all I can configure is the amount of PCI lanes available. (And PCIe voltages in the overclocking section.)
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So don't expect to see any effect on game performance right now.
On the 3080 I saw a difference on 3-4 fps according to benchmarks but I don't think my NAVI can saturate the bandwith as you mention. But I'm talking about games benchmarks that have a high frame rate count like CSGO or so, might be less than 2% increment.
Last edited by Koopacabras on 24 September 2020 at 12:25 am UTC