Re: ATI 4870? Cmon
What settings are you running in COD4? I run everything maxed @ 1440x900 and run in the upper 100s to 200s. Only thing I turn off is smoke edge smoothing, it's a stupid addition and will kill performance of any card.
-Desktop- Dual Monitor, Q8200 2.34Ghz, 8GB, 1TB, XFX 6850, 7 Ultimate
-ASUS UL50- SU7300, 4GB, 500GB, G210M, 7 Home Premium 64, XP Pro
-HP NC6400- Core Duo 1.86Ghz, 2.5GB, 64GB SSD, x1300, XP Pro