Then you should have no trouble... just increase the speed by small incriments until you find it to be unstable, then increase the voltage a little and see if that helps... if it doesn't, increase it a little more. It takes some time to find the max. If you go for broke right away, you may miss an instability in the RAM or video card or something that would prevent you from getting higher speeds even if your CPU is capable of it.
To test for stability, I first run Prime 95... if it runs for 15 minutes I'm satisfied that the CPU is stable and running cool enough. Then I run PCMark2002 to run the RAM through it's paces... if I'm satisfied with that, then I run 3DMark2001 to put the processor, RAM, and video card through it's paces... if that's fine, then I'll either increase the clock speed again, or use it for a few days at that speed and make sure it's stable. If it is, then I may go for a little more speed and do it all over again.