Extracting the last bit of life from my G5

Forgive me if these are stupid questions.

1. Will a PCI-X AJA Kona card accelerate DVCProHD projects in FCP6.x if I chose not to actually use the Kona to monitor my work.

The reason for this somewhat odd question, is that I am currently editing a large project on an older dual 2.7ghz G5. It's a simple but long project and the renders are showing the age of the hardware. I'm currently using the Matrox MXO box from an ATi X800XT (the fastest AGP card that Matrox has qualified) to monitor the grade and, other than the overall sluggishness, this is all going very well.

A friend has an unused PCI-X Kona card that he has suggested I might put in my G5 alongside the regular GPU to give them system a boost. I m curious if this this going to add anything, if I continue to monitor via the existing ATi / MXO? (knowing how intimately the performance of Mac OS X systems are interwoven with the GPU).

2. Will this new set-up allow me to view 10bit 422 material in the full bit depth. AFAIK, the Matrox+ACD is only showing me 8bit e.g. if I bought a 10bit capable flat panel and stuck that alongside my 23" ACD, and connected the KONA via an adapter like the AJA Hi5 SDI to HDMI, would I get a true 10bit picture on the new panel?

3. Finally, does anyone know if the consumer Sony XBR960 34" HD CRT (which, according the the marketing information) has a 10bit comb filter, can display a true 10bit color image?

Thanks for any thoughts.

Paul.