Hello all well my problem is i upgraded my motherboard /psu/memory motherboard im useing is the Asrock N7AD-SLI memory is all matching 5300 / 677 right heres my fault when i installed windows vista 32-Bit my system boots perfect with all 8 gb of ram no problems at all soon has i try to install windows vista X64 wont boot . so i took out 4GB booted up vista X64 no problems installed it run great then i upgraded the memory sticks to 8gb after i did this i tried a normal boot but it keept crashing on the vista loading bar allways a white screen. ive tried ovrclocking the power / speed on the memory sticks allways the same fault 6gb works wonderfull in the system but 8 gb keeps crashing ive got the most upto date bios for my mother board tried the new sticks i brought on there own did a memory test no fault detected . has i said 6gb will boot great but anymore then 6gb crashes on loading screen it has to be 64 - bit vista as i get the full 8gb in 32 - bit vista please could you guys thanks in advance !!!!