AMDzone overclocks the FX60 using stock air, high end air solutions, water and phase change cooling:

So here we see the fruit of our labor as the Prometeia Mach II GT is able to reach a full 3.6GHz, and 300MHz higher than the Thermalright XP-90C. There is a significant price difference, but you also don't have that loud whine of the Tornado. You see thanks to the high powered phase change cooling we were able to push the core CPU voltage to 1.65V without overheating the system. We expect that more tweaking, and perhaps using the DFI Expert might get us up even higher with this unit.

So we see that the FX60 can easily hit 3GHz with stock cooling, and can overclock by 1GHz with phase change. There is definitely some headroom in the FX60s out there, and at least something to look forward to while we await 65nm. We can only dream of those overclocks, but for now if you have the cash, and really want the fastest system on the planet pick up an FX60 and the Prometia Mach II GT. You should have bragging rights for some time to come.