How can I change by software the bandwidth of a PCIe GPU from 16x to 8x ? I use an Asus Hero XI and Windows 10 Enterprise, and a 2080ti.
I could not find anything in the BIOS or in Windows GP or drivers or anything.
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I dont know of any software that will allow you to limit PCIe bandwith.
Looking at the ASUS Hero XI manual, it seems the only way to limit it there is to switch back to Gen2. As stated above already, it should negotiate Gen2 speeds halving your bandwith.
Third option would be to block of half of the pins on the gfx cards.