I just upgraded to 4gb (2x 2gb) from 2gb. I'm overclocking my E6550 from 2.33ghz to 3.5ghz (500*7). This speed was stable with my old memory and when I used blend test with 2gb, prime95 used all 2gbs, however, with 4gb and using the same blend test its only using 2.60gb. Is this normal? if not how can i fix it? I'm using windows vista home premium 64bit.