Asus M3A79-T Deluxe

[justapost]

Thanks for advice! And yes it is running right now 2400MHz and 1.1V . default voltage it is? Stable at idle, stable at load, stable in 3D

You are sure that is NB VID and not the external NB voltage part? I do not get 2.4GHz NB stable here prime95 always fails even with 1.55V but it might take hours. If your NB VID is your CPU VID 1.4V might be abit too low.
Have you posted your setup already here? Do you use 2x4pin 12V rails or one? If one can be you exceed you'r psu's limit.

@gotvoltage: He He it's a mess with 2GB. I tend to run 3DMark06 while running prime95 here every now and then with winxp 32bit 3dmark06 took round 10 minutes to finish. Under Vista 64Bit SP1 it took ~2hrs and the system did barely respond. Still takes longer with 4GB but at least responds while running prime95.