I did find some references in the Apple Knowledgebase archive to using multiple video cards in the 6(4/5)00s. Apparently they don't recommend having 3 monitors attached -- something about how they can't handle all the different brightness levels or something.
<http://docs.info.apple.com/article.html?artnum=20230>: << Since a Power Macintosh 6400 series computer (or Power Macintosh 6500) has a video port and two PCI slots, if I install two PCI video cards, can I attach three monitors to my computer? DISCUSSION No. Though there are enough slots in these computers--through the monitor port and two PCI slots--to connect three monitors, due to the way the built-in video's brightness driver loads, it is possible for this driver to conflict with one of the PCI video card drivers. With only one PCI video card installed, this issue does not occur. When two PCI video cards are installed, the computer can freeze or lose video on one of the monitors. This configuration is not recommended by Apple for Power Macintosh 6400 or Power Macintosh 6500 computers. This article was published in the Information Alley on 6 January 1997. >> -- Over, Jutso http://pages.ripco.net/~jutso/ -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
