I can post w/ 1t cmd rate w/ 1:1 @ ddr 667 w/ 2x 1066 and 2x 1000 Crucail ballistix but its not stable and fails memtest rightaway, this was w/ pretty lose 5 5 5 15 timings @ 2.2V w/ the 0311 bios so w/out alot more volts or maybe even loser timings I doubt it will fly. this same memory works fine a 4 4 4 12 w/ 2.2V at DDR 1000 on the 2:3 raito.