The thing is that I bought it already the w3690 but when I swapped it it didnt post or boot. Then i bought two w3680 (really cheap on ebay) and didnt work either. Al three cores when i put them on and start the pc, they power on for 3-4 seconds, then power off for 2 seconds and then on again with no further activity. Does anybody here have any suggestions of what am i doing wrong? I'd appreciate any help Thank you