I picked up a cheap 480 (150.00). It was a store return that came back from the factory and had a full warranty.
I have a 3 card rig that I use to test cards. 2 cards on the board and 1 riser.
I put the 480 in the 16x slot and it works fine, mines fine, good video....
Put the 480 on a riser and the computer doesn't see it.
The reason I use this setup is that I know the riser is good. I have 3 cards running. Before I swap out a card, I know the board, mem, cpu, power supply (750w), ect... are all good. I know the riser and usb cord is good because it is mining before I introduce the new card for testing.
Anyone experience this before? I have a good system that I know 100% works. I remove a 290 from the riser, add the 480 and it doesn't see the 480. Remove the 480, add a 570, it sees the card and mines fine. Replace the 480 with a 970 and the 970 on the riser works fine. Put the 480 back on and it won't see the card.
Is there something on the card that could be bad that won't allow it to function properly on a riser? Works fine in a 16x slot.
Just stumped.