Halo	Source: Bungie

The game tells the tale of Master Chief, the last surviving Spartan -- a genetically enhanced breed of future super soldier, as he battles mankind's greatest threat -- the Covenant. Released in 2003, Halo is Microsoft/Bungie's first person shooter classic. The game takes advantage of DirectX 9 shaders as well as Pixel Shader 2.0.

Halo
1024x768:	FPS	Ranking
ATi Radeon X850 XT PE	122.9
MSI RX850XT-TD256E	120.39
MSI RX800XT-VTD256E	119.41
ATi Radeon X800 XL	114.03
PowerColor X700 Pro	74.81
MSI NX7800GTX-VT2D256E (Single)	128.41
MSI NX7800GTX-VT2D256E (7800GTX SLI)	139.58
Asus EN7800GT 2DHTV/256M/OSP/A	122.38
Asus EN7800GT 2DHTV/256M/OSP/A (7800GT SLI)	139.32
MSI NX6800GT-T2D256E	108.39
MSI NX6800-TD128E	83.61
MSI NX6800-TD128E (6800 SLI)	115.86
MSI NX6600GT-TD128E	85.01
MSI NX6600GT-TD128E (6600GT SLI)	113.95
Gigabyte GV-NX66T256DE	78
Gigabyte GV-NX66T256DE (617/875)	86.82
1600x1200:	FPS	Ranking
ATi Radeon X850 XT PE	83.89
MSI RX850XT-TD256E	79.39
MSI RX800XT-VTD256E	76.29
ATi Radeon X800 XL	67.28
PowerColor X700 Pro	36.78
MSI NX7800GTX-VT2D256E (Single)	104.25
MSI NX7800GTX-VT2D256E (7800GTX SLI)	128.46
Asus EN7800GT 2DHTV/256M/OSP/A	85.93
Asus EN7800GT 2DHTV/256M/OSP/A (7800GT SLI)	114.31
MSI NX6800GT-T2D256E	65.73
MSI NX6800-TD128E	45.58
MSI NX6800-TD128E (6800 SLI)	76.45
MSI NX6600GT-TD128E	45.93
MSI NX6600GT-TD128E (6600GT SLI)	75.2
Gigabyte GV-NX66T256DE	41.51
Gigabyte GV-NX66T256DE (617/875)	47.02

At stock speeds the Gigabyte GV-NX66T256DE comes in slightly slower than the MSI videocard but not by much. It still compares very nicely against the X700 Pro and even nVIDIA's own Geforce 6800.