5 Monitor Setup with 6870 Flex Card

AMD card only supports 2 legacy port.

So you can only connect 2 of any of these (DVI, HDMI or VGA).

The rest must be through displayport.

If you don't have display port on monitor, use an active adapter (must be active), and use spliter (support up to 3 display on single display port.).
 
@ nikorr, it doesn't go that way. No single GPU from AMD is able to drive up to 5/6 monitors unless it's Eyefinity edition.

@Pyree, using a hub is different than using Eyefinity.

@ OP, you need to get a HD 5870/6990 to support your 5 monitors setup for Eyefinity.