My system is very similar except:
Amd 5200+ (not 6000)
OCZ Vindicator Cooling Kit for CPU
EVGA GeForce 8800 GTX 768mb GDDR3
4 gb DDR2 Dual Channel memory (2 gb corsair, 2gb PNY)
2 WD 160gb SATA HD
MoBoard is Gigabyte (cant get model # where im at right now)
I also upgraded to 700w or 750w power supply
I used to get over 300 fps (dont remember exactly how high) with everything turned on, I lock it at 65 fps. I can check it for exact fps after today's work, if you want me to.
EDIT: CHECKED IT. With everything on, hi-res texture pack, 1600x900x32bit res, and most nvidia stuff set to high quality (vs performance) Im getting average 130fps on South City. I think I was running lower res, no texture packs, and performance setting on nvidia gpu when I was getting the 300 fps.
My system is NOT overclocked. is almost 2 years old, and my 750 w power supply hasnt crapped out on me yet
Found this old post comparison between my old system and new:
OLD system (Intel Celeron 3.2g, BioStar MoBo, ATI Radeon X1300 (AGP, 256mb), 1GB DDR
I can only monitor cpu temp.
Idle Temp: Cpu 41C
Max Temp: Cpu 56C
PcMark05: 2126
3dMark06: 676
NEW System: AMD5200+, Gigabyte MoBo, EVGA 8800GTX (PCI-E, 768mb), 4gb DDR2
I can monitor cpu cores and grafix card temps;
Idle Temps: Core1: 36C, Core2: 34C, GrafX: 64C
Max Temps: Core1: 46C, Core2: 43C, GrafX: 77C
PCMark05: 6316
3DMark06: 9492