I have ran my C0 revision (I think it is) 965 with patriot memory at 1.9v and stock Vtt through prime95 for 24hrs and through 10 days general use before the actual memory started to fail and refused to post.

Now I am running Mushkin 2x6Gb kits at 1.64v at 1333mhz because the latest bios update refuses to allow speeds of 1600mhz