Will this work for eyefinity?

that link will not work.

as long as its an "ACTIVE" display port to DVI adapter yes it will.
sapphire make one that works well. (I have 3)

never had any luck with VGA (DSUB) monitors in the group

Fixed it.  
What is the difference between powered and active?

looks like it will be fine. although does not give much product detail at all. but gives the same model number as
http://www.newegg.com/Product/Product.aspx?Item=N82E16814999034
"100925"

i know the early adapters required power from a USB port in order to work but since have been redesigned to be self contained and draw power from the cards.

Why are powered adapters more expensive than active adapters?

not sure. old stock with old pricing??????

Thanks. Now to find a good monitor for this setup...