Update
After looking at my 3dmark06 score, remembering seeing higher scores in reviews/roundups on the web, I started doing some hardware investigating. Using the system info tool in the NVidia control panel, I found that I was only using 8 lanes of my PCI Express bus.
Wait...Wut? PCI-E should be using 16 when running a single card.
* JamminR thinks about it a few minutes...
DOH.
I put the card in one of the two slots meant for SLI, which, only allows 8 lanes. (It's not a PCI-E v2 board)
Going to go put the card in between the two 8x slots and will retest.
Will repost.