1t works fine for me....ocz pc3500@ 2,2,2,5,1t. i was peviously using 1 gb of kingston hyperx pc4000 and that also ran fine with 1t (3,4,4,8,1T).
if it is overvolting.....rma it quickly!
this is a known issue with some of these boards. i rma'd mine and recieived a properly running board...