apple’s 5000 cards are modded
normal 5000’s have 2 DVI, 1 HDMI and 1 DP
apples 5000 have 1 DVI, 2 DP
apples 5870 are pretty ok in price, $449. but remember, to attach a dual link DVI display to a DP port, you need an active adapter. those are expensive, about $100.
so apple’s card will be very expensive if you have monitors larger then 24″ that are not from apple.