New CPU for BFBC2

ya so i determined that my Athlon II X2 215 OC'd to 3.3 is just not good enough for this game, so im investing in a quad core, looking at the Phenom II x4 925 or the Athlon II x4 630, the 925 is $140, and the 630 is $100, now im looking whether the L3 cache is worth the extra $40 or not, and its kind of hard to find stictly gaming benchmarks for CPU cuz thats all im concerned about, idc about load times and video transcoding stuff, so is the Phenom worth it for strictly gaming?

o and my rig is
Athlon II x2 215 OC'd to 3.3
Sapp 5770 V1 OC'd 960 1400
4GB ddr2-800 gskill
700 stealthxstream PSU

i dont get good FPS at all in BFBC2 ive done every tweak imaginable, and only getting low 40's high 30's on a good fps map @ 1920x1080 with everything off, and ive seen people getting 60's 70's with my card with 4xAA and crap and a quad core so ya, and i preferably want to keep it between these two CPU's, im stretching my budget going with the 925