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TECHINFO-0020230
TOPIC
Since my Macintosh Performa 6400 series computer 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, although there are enough slots in the Macintosh Performa 6400 series computer--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 the Macintosh Performa 6400 computer. 
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