The people with crashing systems due to RAM, do you run it in the 4th DIMM slot? So the most right red DIMM slot?

Cause if I plug any DIMM in there it hardly boots, if it does it BSOD's like hell. So incase you people indeed have a stick in the 4th DIMM slot, this might be a general issue (I thought I killed the DIMM slot cause I forced the 3rd and 4th slots a little out of each other in order to get 2x2GB OCZ ReaperX's to run next to each other lol). But even with normal sized DIMM it doesnt run