Video card rankings as of Oct 2008

HD4870X2
GTX 280
9800GX2
HD4870 1 GB
GTX 260-216
HD4870
GTX 260
HD3870X2
9800GTX+
HD4850
8800Ultra
9800GTX
8800GTX
8800GTS 512MB (G92 Revision)
8800GT 512MB
HD3870 512MB
9600GT
HD2900XT 1GB
HD2900Pro 1GB
HD2900XT 512MB
HD2900Pro 512MB
8800GTS 640MB
HD3850 512MB
8800GT 256MB
8800GTS 320MB
7950GX2
8800GS/9600GSO
HD 3850 256MB
HD2900GT
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 512MB
9500GT
8600GT 256MB
X1900GT Rev2
7800GTX 256MB
7900GS
7800GT
X1800XL
7800GS
X1800GTO
HD2600XT
HD3650
X1650XT
X850XTPE
7600GT
X850XT
7600GTS
HD2600Pro
X800XT/PE
6800Ultra/EE
6800GT
6800GS
X800XL
X850Pro
X800pro
X800GTO/GTO2
Chrome 440GTX
8500GT
Chrome 430
X1650Pro
X1600XT
7600GS
HD2400XT
X800
6800
X800GT
7300GT
X1300XT
X1600Pro
HD3450
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
6200
6200LE
X550
TI4200
5600
5600XT
9550
9600SE
7300LE
5500
X1050
X300
7300SE
7100GS
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
Intel i740
Savage 4
Matrox G200
Riva128
Rage3D Pro
Voodoo Banshee
Voodoo2
Riva
Rage3D
VooDoo1

Sources:
Wikipedia
Anandtech
Xbit Labs
Toms Hardware
Hard OCP
Firing Squad
The Tech Report