From my personal experience you can expect about 200mhz over stock from a tbird w/ aircooling. For that speed proc I would use an FOP38 or Superorb. With watercooling and the voltage mod about 300-350 is possible. Right now I'm runnin a 700@945 (111*8.5@1.9vcore) w/ a superorb in a A7V. My advice is to get the highest possible fsb with whatever multi it will take. Use the multiplier to find the speed cap and then find the right combo of fsb and multi to hit that speed. If you give me a run down of your syste config and operating enviroment I could tell you what to expect. Let me know, laterz.
"I yam what I yam!"