Ya it does... usually if the Voltage is inconsistent..
But even with the same type of the exact same RAM I've seen people had their OC's capped or worse instability at stock sometimes.... get 1 whole 4gb Kit and save yourself some trouble and instability
Looks very good.. enjoy your build (well you can't yet.. the HD 4870 is out of stock... lol)
thanks m8, and i hope soon lol.^That is going to be a kick *** build enjoy it