Maybe it will BUT Not right now
as of ASUS offical CPU support for that board there is NO QX6850 Just
Core 2 Extreme QX6800 (4 cores,2.93GHz,1066FSB,L2:2X4MB,rev.G0) w/ Bios 1203
if its not on the LIST then it will not post and not all 1333FSB CPUs will be working with all esisting board becuase they want to spread them out for the next gen boards and the newer CPUs.