i also using an8 ultra but my corsair ram i think suck..i using amdx2 ..setting as below:

htt 250
ht multipler 4x
multiplier 10x
speed 2.5ghz
ram using ddr333 actually speed 210mhz (ddr 420)
prime stable...din push higher cos load temp reaching 59C using stock cooler..still waiting for my scythe mine to push it over 2.5 again..

i wan to ask is better to have high htt with low cpu multiplier or low htt with high cpu multiplier like the example below:-

10X270mhz = 2.7ghz
9x300mhz = 2.7ghz ....which 1 is better