I am building a PC for Christmas and i would like to know if the things i bought are good for gaming? I really want to know if the Sapphire Radeon HD 7870 ghz edition 2gb..... is good for gaming.....
In general, it is a very good card. But it depends on what your expectations are.
Click the following link for benchmarks which includes the Radeon HD 7870 along with a few weaker cards and more powerful cards. Note the specs of the test rig and the settings used for the games being benchmarked.