Quote Originally Posted by scottc19 View Post
Got my 88800gt back from rma, stress tested it stock and the stock mem 950mhz was stable! So I out on my water block and modded it up. I set it to 1.5v and 1.84vmem like my other card and boot up w/sli bridge in. I get into xp and make sure all my rivatuner overclock stuff is off. Then I open the nvidia control panel and click enable sli. Screen goes black and pc immediatly restarts. I load up xp again and do the same thing, it restarts again, this time won't get past xp loading screen. I unmod the Vmem buck and take my other 8800gt out and put this one in the default slot. I turn it on and I get white and green boxes everywhere that move in post screen. It looks like heavy artifacting, but it has to be stock clocks, because i did not mod bios and I took my Vmem buck mod off, so It is completly stock... Maybe tomorrow I'll take the Vcore mod off and try it, but I doubt that will fix it, but i'll give it a shot. In the mean time anyone have any ideas????
I can't specifically diagnose your problem, but hopefully it'll work fine after you remove or at least turn down vGPU.

I wanted to comment on your vmem mod, though. 1.84v may be ideal for 1 card, but it varies from cad to card, so you need to do some testing. My first card liked 1.84v, but the 2nd one only liked 1.8v.