12GB (6x2GB) GSkill PI 1333 7-7-7-19-1T
ASUS P6T Deluxe
i7 920 cooled by XSPC Delta V3, 750lph, 240 rad

With this system BCLK will not do 190MHz, it is currently priming at 185MHz (3.72GHz), relaxing the RAM to 9-9-9-27 doesn't help, setting tRFC to 110 doesn't help, using 2T or 3T doesn't help. But with only 6GB the board will do 190x20 or 200x19.

Has anyone else found that BLCK is limited by populating all RAM slots?