Everything in the computer is stock except:
1. upgraded to 2.5 mb of RAM
2. upgraded to Corsair 550W power supply
3. upgraded GPU to Geforce 8800 GT 512mb
I achieve playable fps (25-35) on most maps at medium settings but with the old single core cpu I cannot run any additional applications while gaming (such as Mumble or Fraps).
I thought of upgrading the cpu to the Athlon 64 x2 4200. I found one online for $65.
Any advice?
A new computer is in the works but may be as much as a year off.
Thanks!

