Timing is everything.

Got my hands on four 2GB sticks of 1333MHz DDR3 RAM, and that quad core system I mentioned last time turned out pretty sweet. Well, at least it did when I only had the first 4GB in there. Upon adding the second 4GB, things got sketchy. I've tried countless combinations of timings (9-9-9-20-1T and slower), voltages (RAM@1.9V and SPP@1.45V and lower), and bus speeds (1333MHz and 1066MHz) with 4x2GB, but lockups and errors are not consistent... Except that they occur regardless of configuration. I have been able to get all four sticks working together at 1066MHz, 9-9-9-20-2T, RAM@1.7V and SPP@1.4V... But this is supposed to be 1333MHz RAM :\