Since my macbook pro died, and my insurance covered it, I devided to build myself a desktop. I want to be able to boot os x (hackintosh) so I can finish off my projects before migrating to Windows 7. I know its not a long term solution but thats not what I need. Anyway my question is regarding multiple gpu's. I have the choice between the nvidia 580 3gb gtx and the Radeon hd6970 2gb. However I want multiple outs which the Nvidia cards doesnt support. 1. Is it any VJ softwares that support multiple gpu's in crossfire/sli? 2. Any lowend nvidia cards with 3 or more outputs. All the ones i've seen only have 2 outputs. 3. Will adding several lowend gpu's fore more outputs pull full power, or do they remain in a semi-passive state? 4. How much better approx is the 580gtx 3gb than the radeon 6970? Basically all my questions summarized: Would a gtx 580 3gb with two extra low-cost gpu's for multiple outs make more sense than a single radeon 6970 2gb 6 outputs? Considering heat, compability and performance. Thanks alot!