Conflicts with ATI Radeon 5770?

Hello,
I am using a Mac Pro 3.1, 2x2.8 quad core Xeon, with OSX 10.6.7.  I recently upgraded to a ATI Radeon HD 5770 in slot 1 and put my original ATI Radeon 2660XT in Slot 4 to run an older DVI monitor.  It ran ok for a while, but my computer starting crashing more and more often--the black screen scrolls down and it says the computer needs to be restarted.  I am using a NEC PA271W on the 5770 and a NEC 2180UX on the 2660.  Removing the 2180UX seems to have  helped.  My computer has crashed only once since then.
The other odd bit is occassionaly the PA 271W doesn't pick up the signal from the 5770, and I have to restart.  This has happened since I first installed the card and monitor.  Different setting on the monitor don't seem to help.
Anybody have similar problems and have any recommendations about how to fix the problem?  I need to run two monitors.  Do I have to buy a new DVI-D monitor that can be run through the mini connector on the 5770 to replace the 2180UX?
Thanks,
Drew Harty

If I read that article correctly, they don't mention using any combination of dvi and vga displays. The options they mention are:
2 mini display port displays and 1 dvi display
2 dvi displays
3 dvi displays
3 vga displays
(this article doesn't mention 2 vga displays, or my combination of 1 dvi display and 1 vga display).
Conspicuously, my combination of 1 dvi display, connected to the dvi port, and 1 vga display, connected to a mini display port with an apple mini display port- vga adaptor, occasionally gives me popcorn on my dvi display after waking from sleep, restarting, or starting up.
I've never had a problem with the vga display, but there seems to be a problem with the dvi display and connection through the 5770 card on my mid 2010 4-core.

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    +
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    Message was edited by: francis.t

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