hi guyz.. this is the story..i have 2 pc's (mine and my brother) on my house with 2gb of ram.. one with 667mhz kingston and the other with 800mhz supertranx something like that.. well i decided to put the supertrenx memory on my pc to have 4gb.. well i proceed.. i put it without problems and boot.. yay window detect 4gb of ram without problem.. i played for like 30 mins with better performance... then i put back the supertrenx memory to my brother pc... put it.. boot.. and no video( no 3ticks) .. WTF? oh *** i started sweating i damaged my brothers ram.. well calm lets try in the other slot.. nothing.. lets try the memory alone on my pc.. nothing .. lets try my memory on his pc.. nothing.. OH *** I DAMAGED THE 2 sticks..lets try my memory on the other slot... pc boots...phew.. lets try the 2 sticks on my brother pc... nothing... lets try the 2 sticks on my pc.. the pc boots but window detects just 2gb of ram (kingston) in some cases 4gb but only 2gb usable.. i checked the dimm slot on the bios and it recognize the supertranx memory .. cpu-z says i have 4gb of ram and recognize the supertranx memory in his respective slot.. i run games and the performance is the same that i have with 2gb of ram.. what happened? can someone help me plz.. sorry for my english