hey guys, i want to buy this gpu HD 7870 but the R9 270X was said slightly better than hd 7870. Then i saw the other R9 270 without an X and its also slightly cheaper than R9 270X. my question is do R9 270 do the same or just a lil bit different from R9 270X and HD 7870 ? I need to know the answer before this December 3. thankyou