2008 2.8 Oct-core ATi 4870 & 10.5.7 display issues

Anyone else with a 2008 Mac Pro and the new ATi 4870 graphics card? Waited forever for the card, then had to wait another week for 10.5.7. It works, but I get occasional, repeatable glitches on images in Aperture - while cropping images for example. Also sometimes random and not repeatable.
I left the 2600 card installed (moved it over to slot 2) because I have 2 monitors and didn't buy an adapter for the MiniDisplayPort. 2 CRT monitors - both Viewsonic, the main display on the 4870 is a G225f 22" at 2048x1536 and the other is a P95f+ 19" at 1600x1200. Display issues (chunky repeating patterns diagonally in the image, blocks of digital noise, etc) appear on both displays but not in the same way.
Anyone know, performance-wise if I would be better off running both displays off of one card?

There have been issues regarding ATI cards and 10.5.7
I am into Recording and follow the following forum. There is some discussion there.
http://www.logicprohelp.com/viewtopic.php?t=41255
Here is another:
http://discussions.apple.com/thread.jspa?threadID=2004341&tstart=75
Message was edited by: fazmanicg

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