ID Software Doom 3 1.3	Source: id Software

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.

ID Software Doom 3 1.3
HQ 1024x768	FPS	Ranking
Diamond Viper Radeon HD 2900XT	175.4
Diamond Viper Radeon HD 2900XT CrossFire	168.6
MSI RX2600XT Diamond	143.5
Asus EAX1900XTX 2DHTV/512M/A	170.3
Asus EAX1950PRO/HTDP/256M/A	143.2
MSI NX8800GTX-T2D768E	185.3
Foxconn FV-N88SMCD2-ONOC	182.3
MSI NX8800GTS-T2D320E-HD-OC	180.8
GeForce 8600GTS SLI	180.4
Foxconn 8600GTS-256	152.4
MSI NX8600GTS-T2D256E-OC	155.9
Albatron 8600GT-256	146.7
MSI NX8500GT-TD256E	97.4
MSI NX7950GX2-T2D1GE	172.4
MSI NX7900GTX-T2D512E	174.9
MSI NX7900GS-T2D512E-OC	165.9
Gigabyte GV-NX76T256D-RH	134.7
Biostar Sigma-Gate GeForce 7600GS	118.9
Gigabyte GV-NX85T256H (dual GFX cards in SLI)	133.8
HQ1600x1200	FPS	Ranking
Diamond Viper Radeon HD 2900XT	162.9
Diamond Viper Radeon HD 2900XT CrossFire	173.5
MSI RX2600XT Diamond	77.6
Asus EAX1900XTX 2DHTV/512M/A	116.7
Asus EAX1950PRO/HTDP/256M/A	81.9
MSI NX8800GTX-T2D768E	175.1
Foxconn FV-N88SMCD2-ONOC	153.1
MSI NX8800GTS-T2D320E-HD-OC	154.8
GeForce 8600GTS SLI	143.3
Foxconn 8600GTS-256	79.4
MSI NX8600GTS-T2D256E-OC	82.2
Albatron 8600GT-256	74.5
MSI NX8500GT-TD256E	44.6
MSI NX7950GX2-T2D1GE	162.1
MSI NX7900GTX-T2D512E	134.5
MSI NX7900GS-T2D512E-OC	112.7
Gigabyte GV-NX76T256D-RH	71.8
Biostar Sigma-Gate GeForce 7600GS	60.8
Gigabyte GV-NX85T256H (dual GFX cards in SLI)	67.1
UQ 1024x768	FPS	Ranking
Diamond Viper Radeon HD 2900XT	176.2
Diamond Viper Radeon HD 2900XT CrossFire	173.6
MSI RX2600XT Diamond	137.5
Asus EAX1900XTX 2DHTV/512M/A	164.4
Asus EAX1950PRO/HTDP/256M/A	134.1
MSI NX8800GTX-T2D768E	184.5
Foxconn FV-N88SMCD2-ONOC	183
MSI NX8800GTS-T2D320E-HD-OC	180.7
GeForce 8600GTS SLI	178.4
Foxconn 8600GTS-256	147.2
MSI NX8600GTS-T2D256E-OC	150.4
Albatron 8600GT-256	142.6
MSI NX8500GT-TD256E	83.1
MSI NX7950GX2-T2D1GE	170.3
MSI NX7900GTX-T2D512E	174.5
MSI NX7900GS-T2D512E-OC	164.3
Gigabyte GV-NX76T256D-RH	127.2
Biostar Sigma-Gate GeForce 7600GS	115.9
Gigabyte GV-NX85T256H (dual GFX cards in SLI)	129.4
UQ 1600x1200	FPS	Ranking
Diamond Viper Radeon HD 2900XT	156
Diamond Viper Radeon HD 2900XT CrossFire	171.2
MSI RX2600XT Diamond	65.8
Asus EAX1900XTX 2DHTV/512M/A	110.9
Asus EAX1950PRO/HTDP/256M/A	76.3
MSI NX8800GTX-T2D768E	174.9
Foxconn FV-N88SMCD2-ONOC	151.6
MSI NX8800GTS-T2D320E-HD-OC	153.3
GeForce 8600GTS SLI	112.1
Foxconn 8600GTS-256	69.9
MSI NX8600GTS-T2D256E-OC	71.9
Albatron 8600GT-256	70.5
MSI NX8500GT-TD256E	41.2
MSI NX7950GX2-T2D1GE	160.1
MSI NX7900GTX-T2D512E	130.9
MSI NX7900GS-T2D512E-OC	109.7
Gigabyte GV-NX76T256D-RH	68.6
Biostar Sigma-Gate GeForce 7600GS	59.9
Gigabyte GV-NX85T256H (dual GFX cards in SLI)	61.7

The GeForce 8500GT SLI combo nets a respectable performance boost when compared to a single Gigabyte GV-NX85T256H running on its own.