Well if you look at http://game.amd.com/us-en/cros...ex_components.aspx?p=3 you'll see that your psu is not certified for the 3870x2,but it is certified for 2 3870's.Maybe with 2 cards drawing power from 2 pci-e slots it balances out the power draw better?
Crossfire/sli aren't the only ones that see gains going to pci-e 2.0,the newer games that can't fit there textures into vram also show speed improvements on single card setups.When the resolution/IQ are high.
http://www.tomshardware.com/re...xpress-2-0,1915-9.html
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