The performance varies a bit depending on the usage and computer configuration but they are in the order of:
ATI 9700 PRO
ATI 9700
ATI 9500 Pro
ATI 9500
Nvidia Ti4600
ATI 8500
Nvidia Ti4200
ATI 8500 LE
ATI 9000 Pro
Nvidia MX460
Nvidia MX440
ATI 9000
ATI 7500
Nvidia MX420
(without consideration to overclocking)
ATI 9700 PRO
ATI 9700
ATI 9500 Pro
ATI 9500
Nvidia Ti4600
ATI 8500
Nvidia Ti4200
ATI 8500 LE
ATI 9000 Pro
Nvidia MX460
Nvidia MX440
ATI 9000
ATI 7500
Nvidia MX420
(without consideration to overclocking)