Hi Waffles and welcome to the forums,where do we start,the cpu you have runs @1.6ghz,with a system bus @800mhz, htt multi of x8 with 512kb L2 cache,the problem you have is it has onboard graphics,meaning you dont have a dedicated graphics card,onboard graphics cards share system memory,you will really strugle to play the games you have any better than they allready run,sorry,thats not what you want to hear.
You say it's performance rated @2.65ghz,well where did that figure come from,?that's 1000mhz above the cpu's stock speed,i think you have misread something somewhere.Sorry to be the barer of bad news but its the old addage,you get what you pay for,and unfortunatly theres not much you can do to improve the system,but the main thing is dont be disheartened by it,you say it does what you want it to do,apart from run games a little better,so thats the main thing,your happy with it.
Once again sorry for dashing your hopes.
AMD 965BE @4.032GHZ 24/7 VCORE 1.528v TEMPS 32C/52C
MSI 790FX GD70
3 X SAPPHIRE 4890 OC's 991/1100
4 GIG G-SKILL RIPJAWS 1600 @ 7 7 7 24 1.65v RUNNING @1680MHZ
4 SAMSUNG F1 750 GIG SATA II HDD's 2X RAID 0
THERMALTAKE ARMOR+ FULL TOWER CASE
THERMALTAKE TOUGHPOWER MODULAR 850W
THERMALTAKE BIGWATER 760IS WC
28" HANNS-G LCD 1920X1200 3ms
WINDOWS 7 ULTIMATE 32bit OS