I have a Mac Pro 2,1 (late 2007). 16GB RAM (upgrading to 28GB RAM).
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I'm running 2 displays via my*Nvidia quadro fx 4500*video card. These are standard DELL 22" monitors (DELL 2208WFP)
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I'd like to run QT videos (via my music software DAW) to a Toshiba 42" LCD screen. It has old VGA input (along with S-Video and RCA).

I'm currently using a FW Canopus box to do this (via S-Video), but it's no longer behaving well with my softwarre MOTU Digital Performer 8) and OS (10.6.8).
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Is it posisble to install a SECOND*Nvidia quadro fx 4500*video card*in order to view video on the TV screen (and possibly also a 3rd computer monitor, since it has 2 DVI outs?).*

Would two Nvidia cards be ok on my motherboard?...
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Thanks!