Some MBs didn't play nice with certain cards. If it worked perfectly fine in one system and had errors in another, I'd examine the malfunctioning MB for bad caps before I assumed it was the cards themselves.

FFXIhealer wrote:

Some MBs didn't play nice with certain cards. If it worked perfectly fine in one system and had errors in another, I'd examine the malfunctioning MB for bad caps before I assumed it was the cards themselves.

Well, visually the board looks fine, but I don't have any soldering tools to replace any of the caps.

My MB had caps that were bulging slightly, but otherwise looked fine. But I had the occasional "bad RAM" stick that was a fault of the RAM slot and its power delivery (via the caps). A full re-cap job on the MB fixed all stability problems I was having. But that might not be YOUR case at all. I sent my MB off to someone else to get recapped because I tried to remove the first cap and couldn't get it to flow properly. So instead of burning my MB trying to keep at it, I stopped and just paid the other guy to do it. Did a really good job too.

FFXIhealer wrote:

My MB had caps that were bulging slightly, but otherwise looked fine. But I had the occasional "bad RAM" stick that was a fault of the RAM slot and its power delivery (via the caps). A full re-cap job on the MB fixed all stability problems I was having. But that might not be YOUR case at all. I sent my MB off to someone else to get recapped because I tried to remove the first cap and couldn't get it to flow properly. So instead of burning my MB trying to keep at it, I stopped and just paid the other guy to do it. Did a really good job too.

Pretty much done with older PCs for the time being, no reason to have it re-capped if I won't use it beyond testing

I'd test the cards individually without SLI to see if the individual cards work properly. It's also a good way to find out if one of them is bad or both.

FFXIhealer wrote:

I'd test the cards individually without SLI to see if the individual cards work properly. It's also a good way to find out if one of them is bad or both.

Both work fine alone after 1 hour of 800x600 Quake 2 demos.

Then it's not a problem with the cards themselves.