When it comes to AMD cards, the model number gives a hint of it's performance. The first digit tells you it's generation. 6000, 7000, etc. The second number gives you relative performance or level in that generation of chips: 6200, 6600 or 4600 0r 7700. Higher the second number, the better the performance. The third number gives you an idea of the performance of the level of the of that generation of chips. 6230 or 6660 or 7750. Once again, the higher, the better. So an HD 6200 would be the last generations base model card. A 5650 would be a better card because the second and third numbers and higher. Does that make any sense?
It doesn´t work properly with AMD graphic cards, as a 5870 is much better than a 6870, as an HD 6990 is better for gaming than an HD 7970. AMD messed up its own nomenclature.
Anyway, I am not advising anyone to buy an HD6200 -- I have just limted myself to answer the OP.
How have they messed it up? (the x denotes card generation)
x200 - OEM
x300 - basic discrete display card
x400 - generally good for HTPC
x500 and x600 - minimum cards needed to play a game decently with settings turned down.
x700 - mainstream gaming
x800 - gaming enthusiast
x900 - top single GPU card
x990 - double GPU from either 800 or 900 series (depending on power requirement and heat)
The 5000 and 6000 series were different in that they bumped their card designations up in places. 5870 was not superseded by the 6870 (like it usually would have), but rather the 6970 instead. With that example, here was the move for the hd 6000 and later cards:
x600 -> x700
x700 -> x800
x800 -> x900
x900 (dual GPU) -> x990 (dual GPU)
that was the big change.
To the original poster, if he is trying to sell you a 6200, that cannot be right. This is generally reserved to the likes of Dell, HP, etc. - this series card is built in to the system. I would double-check the model number for sure.