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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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    Why is it exactly that you're wanting to limit the number of PCIe lanes your GPU uses? I feel like this could be an XY problem. – Sam Forbis Feb 14 at 14:36
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    It's about benchmarking memory bound processes. – Soleil Feb 14 at 15:18
  • I see. That's certainly a valid reason for wanting to limit PCIe lanes. Thanks for the info! – Sam Forbis Feb 14 at 15:19
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    It should give you approximately the correct results if you go from Gen3 to Gen2. – Sam Forbis Feb 14 at 15:35
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    @Soleil - Are two versions of the PCIe specification equivalent to one another. No; They are not equivalent. Those firmware options basically enable/disable hardware features. – Ramhound Feb 14 at 17:24
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You cannot change it manualy. But slot1 will switch to 8x, if you put any device in slot2

  • Actually I only can change it manually ! I know this, and I want to avoid it. – Soleil Feb 14 at 15:19
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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.

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