Antong,
As Loonym suggested, it could be a driver issue. However, let's check a few things...
Couple of questions: How are you running SLI? (both in blue slots or one in blue and one in white?) If one is in the white slot, you may want to give your SB voltage a bit of a boost, as I believe the white slot is handled via the SB. Try increments of .05v and see if that improves things. Next, how did you arrive at raising the NB GTL voltage? Have you tried to find stability with that on auto? GTL voltages can be finicky. Setting it too high may cause the problem.
Lastly, you want to be sure that your testing thoroughly. Prime95 is a good CPU test, but other tests are better for NB and memory. When running Prime95, be sure to set round-off error checking to on (in the menu,) and be sure you are running the Small FFT test. Also, many don't consider a Prime test worthwhile until it runs for at least 8 hours, while others don't consider anything under 24 hours as being able to prove stability.
For NB and RAM, you'll want to get Orthos 2.0 and run a custom NB only test. If it fails within an hour, you know you have some work to do adjusting your NB voltage settings.
Good luck.
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