Okay your demand for a lower end PC will be heard
At least in terms of the GPU which will be replaced in some weeks
My partly new built PC:
2500k @ 3,3ghz stock speed
Corsair Vengeance 8Gb Ram 1600
ASRock P67 Pro3
Geforce 9800gtx+ 512MB Ram Dx10
Settings in CoD:
1680x1050
SSAO/Vsync/Epilepsy Filter: No
Antialiasing: 1x
Model Detail: High
Building Detail: Low
Land Detail: Medium
Texture Detail: High
Forest: Low
Visual Effects: Medium
Texture Quality: High
Damage Decals: High
Buildings Amount: Unlimited
Land Shading: Medium
Grass: Off
Shadows: Off
Roads: On
Black Death Track results with these settings: Min: 2, Max:82, Avg: 18
With my Laptop (i7 2630QM (4x 2,0Ghz) - 4Gb RAM - Geforce GT540M - Win7 64-Bit ) with the excact settings as a comparison:
Black Death Track: Min: 1, Max: 43, Avg: 12
Of course with this settings unplayable for my Laptop, but for my PC it runs okay if clouds disabled. The Black Death Track is atm for my everyday gaming not significant as I disabled the clouds which give me quite a boost. As you know the track is quite cloudy.
But I build the pc 2 days ago and have to experiment with the settings. Guess there are 2-3 options which have to be lowered to get real decent fps.
Hope this helps anyway!(can't upload pictures because I'm not at home right now)