In no way Did I create this list. I found it on my favorite Overclocking site Overclock.net.
This was the final product of 38 pages of input from the entire community. The cards Go from of coarse Best to worst as it goes down the list. Keep in mind that is NOT my list or my exact beliefs but rather on average which card is better. Please don't complain to me if you think your X1950GT beats my 7900GS or whatever. I myself don't even fully agree with this list as my 7900GS overclocked beats an X1950PRO overclocked but hey these are on average.
8800Ultra
8800GTX
8800GT 512mb
8800GT 256mb
HD2900XT 1GB
8800GTS 640MB
HD2900XT 512MB
8800GTS 320MB
7950GX2
X1950XTX
X1900XTX
X1950XT
X1900XT 512MB
7900GTX
X1900XT 256MB
7900GTO
7800GTX 512MB
7950GT
X1950Pro 512MB
X1950Pro 256MB
7900GT 512MB
8600GTS
X1800XT 512MB
7900GT 256MB
X1800XT 256MB
X1900GT
X1950GT
8600GT
X1900GT Rev2
7800GTX 256MB
7900GS
7800GT
X1800XL
7800GS
X1800GTO
HD2600XT
X1650XT
7600GT
HD2600Pro
X850XT/XTPE
X800XT/XTPE
6800Ultra/EE
6800GT
6800GS
X800XL
X850Pro
X800pro
X800GTO/GTO2
8500GT
X1650Pro
X1600XT
7600GS
HD2400XT
X800
6800
X800GT
7300GT
X1300XT
X1600Pro
8400GS
6800XT/LE
6600GT
HD2400Pro
X700Pro
9800XT
5950Ultra
9800Pro
5900Ultra
9700Pro
5800Ultra
9800
9800SE 256bit
S3 Chrome S27
X700
9700
5900
5800
X1300Pro
6600
5900XT
X600XT
TI4800
TI4600
9600XT
TI4800SE
X1550
X1300
5700Ultra
9500Pro
9800SE 128bit
X600
9600Pro
TI4400
9500
6600LE
X1300SE
5700
7300GS
9600
7100GS
6200
TI4200
X550
5600
5600XT
9550
9600SE
7300LE
5500
X1050
X300
7300SE
9550SE
9200Pro
9000Pro
Matrox Parhelia
8500Pro
GeForce3 TI500
8500
8500LE
5200Ultra
9200
9250
GeForce4 MX460
5200
9000
9200SE
GeForce3
GeForce3 TI200
GeForce4 MX 440
7500
GeForce2 Ultra
GeForce2 GTS
GeForce4 MX 420
Radeon (later renamed Radeon 7200)
GeForce 256 DDR
Voodoo5 5500
GeForce2 MX 400
GeForce 256
Savage 2000
GeForce2 MX
Radeon VE (later renamed Radeon 7000)
Voodoo4 4500
Matrox G400
TNT2
Rage128 Pro
Voodoo3
TNT
Rage128
Savage 4
Matrox G200
Riva128
Intel i740
Rage3D Pro
Voodoo Banshee
Voodoo2
Riva
Rage3D
VooDoo1
