Anybody have issues running 4 gb? Im running 4 x 1gb sticks of the crucial ballistic 12800 and the sticks all do 1900mhz when running just 2 gbs but when i populate all 4 channels I cant overclock worth a darn...in fact I cant even get 1600 to work in 1t mode and it wont even boot at 1800mhz and 8-8-8-20