Doom 3	Source: id Software

Doom 3 is the most advanced OpenGL game to date. It takes advantage of the latest videocard technology and pushes the processing power of the CPU to its absolute limits. At its highest setting, Ultra quality, texture sizes pass the 500MB mark which means even tomorrow's videocards will have a hard time running everything. The frame rates in the game itself are locked at 60 fps so anything above that point is wasted. Each test is run three times and with the third run being recorded.

Doom3
HQ 1024x768	FPS	Ranking
ATi Radeon X850 XT PE	116.9
MSI RX850XT-TD256E	112.5
MSI RX800XT-VTD256E	109
ATi Radeon X800 XL	101.8
PowerColor X700 Pro	54.3
MSI NX7800GTX-VT2D256E (Single)	123.5
MSI NX7800GTX-VT2D256E (7800GTX SLI)	121.9
Asus EN7800GT 2DHTV/256M/OSP/A	125.3
Asus EN7800GT 2DHTV/256M/OSP/A (7800GT SLI)	127
MSI NX6800GT-T2D256E	112.6
MSI NX6800-TD128E	87.8
MSI NX6800-TD128E (6800 SLI)	119.4
MSI NX6600GT-TD128E	92.4
MSI NX6600GT-TD128E (6600GT SLI)	116.2
Gigabyte GV-NX66T256DE	80.1
Gigabyte GV-NX66T256DE (617/875)	89.9
HQ1600x1200	FPS	Ranking
ATi Radeon X850 XT PE	66
MSI RX850XT-TD256E	61.8
MSI RX800XT-VTD256E	58.4
ATi Radeon X800 XL	52.5
PowerColor X700 Pro	25.9
MSI NX7800GTX-VT2D256E (Single)	97.6
MSI NX7800GTX-VT2D256E (7800GTX SLI)	117.6
Asus EN7800GT 2DHTV/256M/OSP/A	87.2
Asus EN7800GT 2DHTV/256M/OSP/A (7800GT SLI)	118.3
MSI NX6800GT-T2D256E	70.4
MSI NX6800-TD128E	46.3
MSI NX6800-TD128E (6800 SLI)	70.6
MSI NX6600GT-TD128E	47.4
MSI NX6600GT-TD128E (6600GT SLI)	79.4
Gigabyte GV-NX66T256DE	40.4
Gigabyte GV-NX66T256DE (617/875)	45.4
UQ 1024x768	FPS	Ranking
ATi Radeon X850 XT PE	113.1
MSI RX850XT-TD256E	108.3
MSI RX800XT-VTD256E	104.5
ATi Radeon X800 XL	97.8
PowerColor X700 Pro	52.8
MSI NX7800GTX-VT2D256E (Single)	122
MSI NX7800GTX-VT2D256E (7800GTX SLI)	121.9
Asus EN7800GT 2DHTV/256M/OSP/A	121.2
Asus EN7800GT 2DHTV/256M/OSP/A (7800GT SLI)	124.3
MSI NX6800GT-T2D256E	111
MSI NX6800-TD128E	88.4
MSI NX6800-TD128E (6800 SLI)	115.9
MSI NX6600GT-TD128E	87.5
MSI NX6600GT-TD128E (6600GT SLI)	115.3
Gigabyte GV-NX66T256DE	75.1
Gigabyte GV-NX66T256DE (617/875)	83.8
UQ 1600x1200	FPS	Ranking
ATi Radeon X850 XT PE	63.8
MSI RX850XT-TD256E	59.5
MSI RX800XT-VTD256E	56.2
ATi Radeon X800 XL	51
PowerColor X700 Pro	21.9
MSI NX7800GTX-VT2D256E (Single)	96.7
MSI NX7800GTX-VT2D256E (7800GTX SLI)	118.8
Asus EN7800GT 2DHTV/256M/OSP/A	84.2
Asus EN7800GT 2DHTV/256M/OSP/A (7800GT SLI)	116.7
MSI NX6800GT-T2D256E	69.3
MSI NX6800-TD128E	48.7
MSI NX6800-TD128E (6800 SLI)	82
MSI NX6600GT-TD128E	46
MSI NX6600GT-TD128E (6600GT SLI)	79.7
Gigabyte GV-NX66T256DE	38.7
Gigabyte GV-NX66T256DE (617/875)	43.1

The extra memory on the Gigabyte GV-NX66T256DE is not enough to make up for its lower stock clock speed.