Thanks for the reply guys...sorry but may i ask one more question?
Will it be viable to do such a thing or just get a 5870?
Upgrading from a HD5850 to HD5870 is very small, two HD5850 in crossfire would be a big upgrade.
+1^ You can OC a 5850 to reach 5870 speeds so going from a 5850 to 5870 won't give you a noticeable boost in performance;however adding another 5850 will give you a good performance boost(you'll get the performance of a 5970)
Cool thanks a whole bunch..will go for xfired 5850's..