I think my PCI-E slot is defective.

[gyuho945]

I bought Asus Maximus VII Formula on newegg two months ago. Everything was working perfectly by now. But suddenly my PCI-E doesn't recognize my GPU ( Gtx 780 ). GPU's fans are working though. So I'm using PCI 2.0 now.
What do I have to do to fix it?

 

[markwp]

Have you tried the gpu in a different slot and does it work there?

 

[gyuho945]

Have you tried the gpu in a different slot and does it work there?

Yes. I'm currently using the GPU in a different slot and it works fine. GPU is not the problem. I wonder what's the difference between PCI-E and PCI 2.0. If there's not much difference, I'll keep using this slot.

 

[markwp]

Try reseating the gpu in the original slot. If it still doesn't work, RMA the board.

PCIE is the high speed interconnect bus for peripheral components (gpu, sound card, etc). In today's boards the different versions start at pcie, then pcie-1, -2, -3. Each ascending number is basically an upgrade in speed capability. While your card is designed for -3, it will work fine on -2 as the versions are generally backward compatible. Generally, today's cards cannot saturate -2, but that will change quickly.

Regardless, if the lane isn't working, I'd send the board back.

Mark