Some friend asked me for two 1.8 CPU's, and i have exact 2 1.8 that are working. And a 2.0 that is also working. So i thought i put the 2.0 in my 1.8 machine. It works, it is recognized as 2.0 but i noticed while benchmarking, that the speed goes up and down. This is a Xbench of the 1.8 and that is very constant: This is 3 times the 2.0: As seen it is some kind of rotating. Running something like Cinebench is slower than on the 1.8 The ASD-cd tells me that i installed a CPU whit a Faster MLB than the one on the mainboard. The 2.0 has 1000 Mhz and the mainboard has 900 Mhz. I think that there is the Problem. Is it possible to modify the Mainboard to 1000 MLB? or the CPU to 900? The Thermal Calibration worked.