Which one of these GPU setups is better?

[angelkiller117]

Would ONE of these http://www.newegg.com/Product/Product.aspx?Item=N82E16814102795

be better than

Two of these http://www.newegg.com/Product/Product.aspx?Item=N82E16814102719

 

[Jones]

Yep.

One 4870 as 800 stream processors, whereas the 3870's have 320 each.

IMO - You're almost always better off to get the single more-powerful card than to go with two less-powerful cards.