GTX 590/Radeon HD6990
Radeon HD5970
Geforce GTX580
Geforce GTX570
Geforce GTX480
Radeon HD 6970
Radeon HD 6950
Geforce GTX295
Radeon HD4870X2
Geforce GTX560 TI
Radeon HD5870 2gb
Radeon HD5870
Geforce GTX470
Radeon HD6870
Radeon HD5850
Radeon HD6850
Geforce GTX285
Geforce GTX460 1gb
Geforce GTX465
Geforce GTX460 SE
Geforce GTX460 768mb
Radeon HD5830
Radeon HD6790
Geforce GTX280
Geforce GTX275
Radeon HD4890
Geforce 9800GX2
Geforce GTX260-216
Geforce GTX550 Ti
Radeon HD4870 1gb
Radeon HD5770
Radeon HD4870 512mb
Geforce GTX260
Geforce GTS450
Radeon HD3870x2
Radeon HD5750
Geforce GTS250 1gb
Radeon HD4850 1gb
Geforce 9800GTX+/GTS 250 512mb
Geforce 8800Ultra
Radeon HD4850 512mb
Geforce 9800GTX
Geforce 8800GTX
Radeon HD4770
Geforce 8800GTS 512
Radeon HD6670
Radeon HD4830
Radeon HD5670
Geforce 8800GT 512/ 9800GT
Radeon HD4730
Geforce 9600GT
Geforce GT240
Radeon HD 2900XT
Radeon HD3870
Geforce 8800GTS 640
Radeon HD4670
Radeon HD2900Pro
Radeon HD3850 512mb
Geforce 8800GT 256mb
Geforce 8800GTS 320
Geforce 8800GS/9600GSO 384mb
Geforce 9600GSO 512mb
Radeon HD5570
Geforce GT430
Radeon HD6450
Geforce GT520
Radeon HD5550
I listed older cards to simply give a frame of reference, below the HD5550 are the Geforce GT230 and lower, Geforce 9500GT and lower, Geforce 8600GTS and lower, and Geforce 7 and lower, as well as RadeonHD5450 and lower, Radeon HD4650 and lower, Radeon HD3850 256mb and lower, Radeon x1k and lower.
These numbers can be backed up at any major review site, tomshardware, Techreport, techpowerup, anad ect, this is a basic list, how it preforms in the games you care about isnt listed this is an average of the benchmarks, use this as a basic gague when asking how say your old 8800GTS320 compares or if you should upgrade to a Geforce GT520 for instance.