My buddie is using a 285 too and has similar problems (he has 4 core 3.4GHz i7 and 6GB RAM).
It could be the VRAM. His card has 1GB, my GTX570 has 1.28GB and CoD is using every bit of mine. Of course it's faster too and my i7 is at 4GHz but neither of our CPUs are taxed more than around 60-70% on Core1, 30% core 2, 10-15% cores 3 & 4. My fps is 50-60 over water, 30-50 over land, on High settings with Grass off and Forest and Buildings at Medium (1680x 1050). So, probably the GPU.
But Luthier says there is still work to do on that.
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klem
56 Squadron RAF "Firebirds"
http://firebirds.2ndtaf.org.uk/
ASUS Sabertooth X58 /i7 950 @ 4GHz / 6Gb DDR3 1600 CAS8 / EVGA GTX570 GPU 1.28Gb superclocked / Crucial 128Gb SSD SATA III 6Gb/s, 355Mb-215Mb Read-Write / 850W PSU
Windows 7 64 bit Home Premium / Samsung 22" 226BW @ 1680 x 1050 / TrackIR4 with TrackIR5 software / Saitek X52 Pro & Rudders
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