If you're still having problems with low GPU usage (20-60%) using a Fermi card (GTX 460-480), you might wanna try these drivers if you don't already have them.
It's the Quadro 265.90 WHQL drivers. I haven't tried them yet, but supposedly they fix the low GPU usage problem seen in FFXIV and BF:BC2, which results in low framerates no matter what settings you change.
Unlike most people, I don't believe the issue to be a CPU bottleneck, considering I've had a system still using a stock dual core E8500 with a GTX 460 running Metro 2033 at much higher, stable FPS and 95-99% GPU usage. Granted, my i7 920 system with a GTX 480 runs both games flawlessly, but that's more a matter of brute forcing good performance instead of dealing with the actual problem. This leads me to believe that it's a problem with console-ported games being poorly coded that they don't use a GPU's full potential (both FFXIV and BF:BC2 are ported from PS3 and XBOX 360), either a fault of Square-Enix/DICE, or a fault of Nvidia's drivers themselves not being compatible with the ports... maybe both.
The Quadro drivers supposedly put some of this excess CPU processing on the GPU, where it would normally be. I've done some browsing on the Guru3D forums and most people seem to have their FPS doubled and GPU usage bumped up to 80-90% usage in BC2.
Though, like with any other driver, a few reported no change.
Just wanted to put it out there for anyone who wanted to try it.
Here's the thread on Guru3D, including the driver download and modified .inf for the best results:
Edited, Dec 27th 2010 5:19pm by SoumaKyou