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Would be better but not by much.
4850 to 5850 is a much better upgrade.
I went from 4850 to a 5750 both in crossfire. Im getting better scores with the 5750 but not by much. Moved to them cause wanted the 1gig + less noise + heat and less power, Also DX11 is also a help & i only play at 1680x1050.
The 5770 would be better again but only after you overclock it. Also if it has more ram then your 4850 ect...
It all depends on why you want to upgrade.
anything bigger than a 22" then I'd say go for it, for the 1gb over the 512mb.
My 4850's was bad clockers also.
My 4850 won't even overclock by 1Mhz lol
Overclock the nuts off the 5770 and you'll be sorted![]()
No because the reason i think it won't overclock is due to heat so a different bios won't helptried flashing to another bios?
You could go Xfire 4850. However 512MB is certainly a limiting factor, especially in new games going forward.