So, I went out and bought me way too expensive hardware. I now am the proud owner of: asus p7p55d i7 870 and 3870x2 (times 2) The problem here is: the 3870s won't go into crossfire properly. They run in triple crossfire (according to the catalyst control center, the highest I can set them: choices being 2 GPUs (20) or 3 GPUs (205)), and apparently in dual (can see 2 of the GPUs / 1 card drawing power) which I can see in performance (90 versus 170 fps). Just now I had a boot in which only dual worked regardless of the amount of GPUs catalyst control center said were set. Now I had the 3870x2 x2 setup inside my core 2 duo e4500 (gigabyte ep45-ds3r) setup and it ran fine in quad crossfire then... the OS installed then was windows 7 ultimate x64 just like now. Only thing I can think of is that I have yet to install directX (surprisingly benchmarks from unigine run without it). All four GPUs are detected by the OS and have proper drivers installed (latest greatest). Oh and of course I have a crossfire bridge installed . So anyone have any ideas ?