Looks like cleaning the pci/dimm slots and the gpu/memory with QD electronic cleaner, some paper towels & a toothbrush fixed it, for now anyways.
Thanks alot Bones
Now I just wonder if I'll do better benching with 2x512 @ 270ishMHz 2.5-4-4-10, or if my other stuff...2x512 @ ~250MHz 2-2-2-5 will be better?