But wouldn't be as good as 5770 CF
Plus the ref 5770 one of the best OC card there is.
And even the non ref cards can be V modded generally.
Have mine at 960/1375 at 1.20v and had them at 1000+/1400
plus, but heat became a problem because of my board in CF.
Added ram heat sinks and side case fan to help.
Spacing on my board and top card a problem
Spacing problem Pics.
And case fan help.