Re: Question about O/Cing
1GB of RAM is really stretching it for online games like BF2. The lag you're seeing is probably due to the RAM.
Why do you have a different model/amount of RAM in your signature?
Anyway, as for OC'ng, you didn't list your memory speed, so it's hard to say what kind of divider you should be using. I know that my 680i was never stable unless I ran it at half my FSB speed. I ran a 3600mhz overclock w/ 1600 on the FSB and 800mhz on the RAM and it was stable until my board crapped out on me this week.
i7-2700k @ 5.0 GHz
Nvidia GeForce 570 2.5GB Tri-SLI
Asus P67 WS Revolution (Tri-SLI)
OCZ Vertex SSD x 4 (Raid 5)
G.Skill 8GB DDR3 @ 1600MHz
PC Power & Cooling 950W PSU