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Asus Maximus Hero XII 2nd PCI-E slot not working

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Hi all, it's been a minute since I've been here. Just put together my first build in a while, and I'm having issues.


Specs are as follows:


Asus Maximus Hero XII

Intel 10900k

2x 2080ti

Corsair RM1000 1000W PSU


My 2nd PCI-e slot does not appear to be working correctly. It will just about let the system boot to windows and show visuals, but the card shows as "Windows has stopped this device because it has reported problems. (Code 43)" in device manager.


Trying to use 2x 2080ti, but the second slot just will not work at all.

This is my 2nd of these boards now, the first also had the same issue. Anyone else experience this? Is there something I could be missing? I've tried both cards in both slots, both cards work in the first slot.

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