On the AMD side of things, nVidia chipsets runs stable.
My experience shows otherwise. My old Asus A8N32-SLI paired with an AMD Opteron 165 was far from stable. I would get random BSOD crashes (Windows XP) at least twice a week. When that same CPU was on an Asus A8R-MVP I never had issues.
It wasn't the video card, sound card or hard drive because I migrated all of that to an Intel Core 2 Duo rig with a P35 chipset. Never had stability issues with that setup.
Will never touch anything nVIDIA ever again. By far the most horrible and unstable drivers that I have ever seen.