I am looking to run 2 HD 5870's in this machine. I already have 1 card it is a ASUS V2 ( the one with 1 DVI, 1 HDMI and 1 display port). I cant seem to find another card that matches mine exactly. I can find the V1 card that from my understanding is longer and has 2 DVI ports and I can find the eyeinfity version that has all display ports. Can I use any of these cards in crossfire or do I have to have the one that matches my card exactly? And also I have a 800 watt powers supply and from my understanding that should be plenty of power but just wanna make sure.