880g 1.70 bios... 300 htt works now but running my 1600's at exactly 1600 (300*5.33) doesn't boot. 301*5.33 htt does boot, though 295-299 doesn't. and so 240*6.67=1600 doesn't boot either. (i think this may have been the case from the first bios but i didn't relate it to memory clocks, i was only thinking htt ref clock then). anyway i'm kinda forced to run 1333C6 it seems.