I don't have an 8800 GT but I do have an 8600 GTS. I've got mine set up using EFI with my card's hex embedded into the apple.com.boot.plist - everything is working great. The only game that runs like crap is CoD 2, but that is par for the course with the G9x chip.

---

MacBook Pro 15" | Mac OS X 10.6 • 2 GHz Intel Core Duo • 2 GB DDR2-667 • ATI Radeon Mobility X1600 128 MB • 100 GB Serial-ATA
Hackintosh | Mac OS X 10.5.6 • 3 GHz AMD Athlon 64 X2 6000+ • MSI K9N AM2 • 2 GB DDR2-667 • NVIDIA GeForce 8800 GT 512 MB • ALC888 Audio • 300 GB Serial-ATA
iPhone 3G • 8 GB