Crossfire 6770 or 6950

With the 6950 you'll have an upgrade path for the future, with the 6770 you're done and finished.

but the 6770 CF faster than one 6950 !!

Not all games work well with multi-GPU setups, so he will run into problems and bad performance in some games. Plus, replacing the 6770s when they are too weak will cost more than getting a 2nd 6950, in most cases. The performance difference is hardly significant anyway. Plus, he's limited to 1GB of VRAM in CrossFire.

nope. CF 6770 has the same performance as a 5870 and the 6950 is slightly better by a 2-4% overall margin.

IF you already had one 6770 then crossfire 6770's would be the way to go but if buying new then go for the 6950 -- performance is going to be close on both but as mentioned the 6950 will only tie up a single slot leaving room to add another in the future for improved performance where the 6770's cap out and would require replacing both to get any improvement in the future. Plus some games still have issues with crossfire configs and depending on the setup you have usually run hotter and use more power.

Thanks guys. That was all very helpful feedback.

if u unlock 6950 to 6970 , the 6770s are of no use in future as u can blow another one in future