IRRC with the 5xxx-9xxx series of nvidia GFX cards the 1st 2 numbers are the most important. the 1st number tells you how old it is 5 being the oldest and 9 the newest.
The second number is an indicator as to how good it actually is. with 1 or 2 being the lowest/worst and 9 being the highest. 2-4 are not really made for gaming mainly just casual use and most old games.
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