It's alot better than my Athlon XP 2100+ (13*133). The FSB is actually set at 136 MHz, and that's it. My PC boots at 140 MHz, but is unstable, at 145 I don't go farther than the POST and at 150 my BIOS autoflashes itself (Gigabyte dual BIOS feature). Of course, the multiplier is locked, I'm using the stock heatsink and have to learn how to play with voltage and memory settings. Did you know that newest AMD Athlon64 FX don't have a locked multiplier?