The lower it si on the list, the faster it is in most games.
The only wild card is I'm not sure where the geforce6200 series fits in, but just expect it to be 1/2 to 1/4 as fast as the 6800. at very low resolutions all optios lowest, the 6200 will be 1/2 as fast, at more played resolutinos, with higher quality settings, ti will struggle to be even 1/4 as fast.
GeforceSDR
GeforceDDR
Geforce2mx400
Geforce2 GTS
Geforce2 Ti
Geforce2 Ultra
Geforce mx440
Geforce mx460
Geforce FX5200
Geforce3 ti200
Geforce FX5200ultra
Geforce3
GeforceFX 5600
Geforce3 ti500
GeforceFX5600Ultra
Geforce4 ti4200
Geforce4 ti4400
Geforce4 ti4800SE
Geforce FX5700
Geforce4 ti4600
Geforce FX5700Ultra
Geforce FX5800
Grforce 6600
Geforce FX5900XT(also Calles FX5900SE by 1 manufacturer which I cant recall off the top of my head)
Geforce FX5900
Geforce FX5800Ultra
Geforce FX5900Ultra
Geforce FX5950Ultra
Geforce 6600GT
Geforce 6800
Geforce 6800GT
Geforce 6800Ultra
Geforce 7800GT
Geforce 7800GTX