HELP!! RAM problem
i have 6GB of ram, but under performance in windows task manager, it says i only have 4. In system, under installed memory, it says 6 GB(4GB usable). i have 6 slots and im going to put ram in 1 3 and 5. the problem is slot 5. i tried different combination (all my rams work) and i found out that if i put a ram in slot 5, it become "unuseable". i built my computer last week and when i first built it, all 6 gb worked. this is driving me crazy, i really need help! what do i do?