Dilyn

For your first reply...
I'd say to use the game that you listed which was the latest to come out. So that'd definitely not be StarCraft, 'cus that came out in the... 90's? Albeit, great game. But not good for testing an OC because you wouldn't really notice much improvements on it.
Warcraft 3 and Universe at War are the two that I'd look at.
To determine the speed in Ghz:
Let's say that your multiplier is 9.5 (like mine). You want to get your CPU to 3.2Ghz (which I did). You would divide 3200 by 9.5, or your desired OC by your multiplier. You'd get some number that when on forever, and if you rounded it up, you'd get 337. If you multiply 9.5 and 337, you'll get a little over 3200. That 3200 is in Mhz.
Do you get it now? If not, I can clarify it a bit more for you.
Basically, it's your multi times the FSB, and your answer is in Mhz. There are 1000 Mhz in one Ghz.

For your second reply...
Sounds like you managed to get it overclocked. My BIOS are not the same as yours, so I can't really walk you through on how to do it because mine is a bit different (I don't have an advanced section, but I do have an M.I.T or whatever tab where I tweak settings like what you have). Usually you'd go into the advanced section and edit the stuff in there.
Sounds like your multi is 12 if I did my math right...