If you run 4 seperate instances (setting core affinity on Quad obviuosly, 2 for Dual) of P95, you can max out the cores. You just have to copy the Prime95.exe into 3 other folders (in the same directory is easiest) and rename the copies to something different (i.e. Prime95_1.exe, etc...). But don't run blend on more than one instance, cause it will likely lock your system.