CS4 does not have the hardware acceleration that was added in CS5 so just about any card will work
Further, ATI video cards don't offer hardware acceleration in CS5, only nVidia cards do.
Finally, there is no SLI support, so only one card is needed.
Thanks for the feedback. Im still wondering though why I still get problems importing my clips to cs4. My computer specs, I believe, is more than enough for the minimum requirements required by the program (i7-930, 4GB DDR3 RAM, (1) 320GB and (1) TB 7200RPM SATA Drives, ATI 4670 VC). and I already converted my Xacti1010 clips to HD avi/mov/mp4 even avchd as suggested by Mr. Milaard on my previous post http://forums.adobe.com/thread/682651?tstart=0.
Side question though, does the proper sequence selection affect the importing of files to cs4?
Thank you and hope to learn more from you guys.