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 (SLI Mode)	139.58
Asus EN7800GT 2DHTV/256M/OSP/A (Single)	122.38
Asus EN7800GT 2DHTV/256M/OSP/A (SLI Mode)	139.32
MSI NX6800GT-T2D256E	108.39
MSI NX6800-TD128E (Single)	83.61
MSI NX6800-TD128E (6800 SLI)	115.86
MSI NX6600GT-TD128E (Single)	85.01
MSI NX6600GT-TD128E (SLI Mode)	113.95
Gigabyte GV-RX18L256V-B	123.4
Gigabyte GV-RX18L256V-B (521/540)	122.96
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 (SLI Mode)	128.46
Asus EN7800GT 2DHTV/256M/OSP/A (Single)	85.93
Asus EN7800GT 2DHTV/256M/OSP/A (SLI Mode)	114.31
MSI NX6800GT-T2D256E	65.73
MSI NX6800-TD128E (Single)	45.58
MSI NX6800-TD128E (6800 SLI)	76.45
MSI NX6600GT-TD128E (Single)	45.93
MSI NX6600GT-TD128E (SLI Mode)	75.2
Gigabyte GV-RX18L256V-B	84.81
Gigabyte GV-RX18L256V-B (521/540)	87.39

Halo performance is all over the place... The ATi Radeon X850 XT PE performs very close to the Radeon X1800 XL based Gigabyte GV-RX18L256V-B. The Radeon X1800 XL and a single GeForce 7800GT perform neck and neck.