technoboyhrishi :
thanks bro so which one is the best in AMD radeon Series graphics ?
Well the latest series is 7 thousand series. Each year a new series is released and they're better and more powerful.
Easy way to work them out, The first number is the series, example "7"870. The second number is the model, ranging from 1 being the least powerful to 9 being the most. The third number is an extension of the second number, it just means that they're the same card but one is turbocharged. So a 7870 is more powerful than a 7850.
So from the current series of AMD cards, the 7750 is the weakest and the 7990 is the most powerful. And of course the price reflects this: 7750=£65 / 7990=£800.
So are you looking for a new card or building a new rig???