Gun Metal 2	Source: Yeti Studio

Gun Metal 2 is one of the first benchmarks to take full advantage of DirectX 9 technology. According to Gun Metal 2, 2x AA is enabled by default on all videocards and the listed frame rates are average. Gun Metal 2 is not currently SLI compatible

GunMetal 2
Game 1 1024x768	FPS	Ranking
MSI RX800XT-VTD256E	58.79
PowerColor X700 Pro	30.25
Albatron Trinity PC6600	26.19
Albatron Trinity PC6600U	36.09
MSI NX6600GT-TD128 AGP	44.08
Albatron Trinity GeForce 6800GT AGP	45.16
Gigabyte GV-NX66T128D	46.37
MSI NX6600GT-TD128E (Single)	46.49
MSI NX6600GT-TD128E (SLI Mode)	46.08
Gigabyte GV-3D1 (Single GPU Mode 500/1120)	47.7
Gigabyte GV-3D1 (SLI Mode 500/1120)	47.5
Game 2 1024x768	FPS	Ranking
MSI RX800XT-VTD256E	67.8
PowerColor X700 Pro	39.91
Albatron Trinity PC6600	34.6
Albatron Trinity PC6600U	45.81
MSI NX6600GT-TD128 AGP	52.06
Albatron Trinity GeForce 6800GT AGP	53.3
Gigabyte GV-NX66T128D	54.99
MSI NX6600GT-TD128E (Single)	54.89
MSI NX6600GT-TD128E (SLI Mode)	54.5
Gigabyte GV-3D1 (Single GPU Mode 500/1120)	55.83
Gigabyte GV-3D1 (SLI Mode 500/1120)	55.45
Game 1 1600x1200	FPS	Ranking
MSI RX800XT-VTD256E	36.92
PowerColor X700 Pro	17.4
Albatron Trinity PC6600	16.36
Albatron Trinity PC6600U	22.89
MSI NX6600GT-TD128 AGP	27.17
Albatron Trinity GeForce 6800GT AGP	27.99
Gigabyte GV-NX66T128D	29.1
MSI NX6600GT-TD128E (Single)	29.08
MSI NX6600GT-TD128E (SLI Mode)	28.96
Gigabyte GV-3D1 (Single GPU Mode 500/1120)	30.68
Gigabyte GV-3D1 (SLI Mode 500/1120)	30.66
Game 2 1600x1200	FPS	Ranking
MSI RX800XT-VTD256E	47.07
PowerColor X700 Pro	22.02
Albatron Trinity PC6600	20.15
Albatron Trinity PC6600U	29.11
MSI NX6600GT-TD128 AGP	36.03
Albatron Trinity GeForce 6800GT AGP	37.01
Gigabyte GV-NX66T128D	38.14
MSI NX6600GT-TD128E (Single)	38.14
MSI NX6600GT-TD128E (SLI Mode)	38.05
Gigabyte GV-3D1 (Single GPU Mode 500/1120)	39.81
Gigabyte GV-3D1 (SLI Mode 500/1120)	39.8

As you can see, Gun Metal 2 does not support SLI. Something people should remember if they want to go SLI is to make sure the games you're going to run are supported! Future versions of the drivers should support creating your own SLI profiles, so this may not be an issue for long.