Quote from: dingus on February 10, 2011, 12:35:13 AM

Quote from: yurumtin on February 09, 2011, 11:23:12 PM

When I started generating bitcoins using my GPus I had two Nvidia 8800 GTS cards. So pleased with bitcoin I decided to upgrade and changed to an ATI 5770 card. I had to remove both of my nvidia cards to do this because when one of them was in it wouldn't allow me to generate with my new ATI card. No big deal, this new card was 10x as powerful as one of those cards. But now I have become so excited about bitcoin I decided to buy another ATI card to go with my new 5770. This time I got a 5870. But, when I get them both set up neither works. The 5870 doesn't seem to work on it's own either. I am trying to figure out why. Below I will list my relevant hardware to help you.

600W PSU with enough 6 pin jacks for both cards.
ASUS M2N-SLI Deluxe motherboard
ATI 5770 card
ATI 5870 card.

Any advice would me much appreciated!

What gpu miner are you using? Have you tried starting the miner on one card, unplugging the monitor, waiting a second, and then plugging it into the other gpu and then starting another miner for that gpu? That trick works with my 5970 + 5770 rig.

Sorry,I didn't make this clear. When the other card is in the second slow neither card work at all. The screen isn't coming on.

However, I just tried the 5870 card in the first slot, the one I was using for the 5770.Works. So, turns out either my second slot is the problem (Which I doubt because both of my nvidia cards worked flawlessly together). I think this may have something to do with either A. Not enough power from my PSU. B. My motherboard is trying to do SLI without telling me. This second option is possible because SLI is in the name of the board and because the two cards are not the same. I know for SLI you need two cards that are exactly the same.

Any thoughts?