guys please help me i have seen very good deal for 5850 and i thought if i can buy it it will be very good to me if i can CF with my current 5870 because i crave fps increase so will it work second i heard my 5870 will downgrade it speed to be equal with hd 5850 is that right third what is CF X i heard if i can run them together it will be possible through CF X ? ok thxxx