Well, I tried again with success so far...
FSB 430 x 7,5 = 3.225Ghz
Core Voltage in bios = 1.2750 (CPU-Z gives 1.248 V)
Memory 1:1, 5-5-5-18
Core Voltage should be save now I guess?
Looks fine to you guys or did I forget something?
So I came to Core Voltage on 1.30625 to run Prime95 (Small FFT's) for one hour without errors.
Temps with RealTemp were at max. 71,67,67,67. Are those temps ok?