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4890...Ass whoops a 5770 for the same or less 

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From what I have seen 5770 is mostly cheaper than 4890?
4890 - http://www.overclockers.co.uk/showproduct.php?prodid=GX-120-OK&groupid=701&catid=56&subcat=1403
5770 - http://www.overclockers.co.uk/showproduct.php?prodid=GX-131-OK&groupid=701&catid=56&subcat=1515
True I would personaly go with the 5770 and crosfire as A) you get much better crossfire scaling B) Direct X11 and C) Eyefinity
They are pretty much equal, it just depends whether you want upgradability or performance
the 4890 is older tech and will probably show it's age much quicker than the DX 11 5770
the 4890 is older tech and will probably show it's age much quicker than the DX 11 5770