Running GeForce 8800 GT and the GT 120 together, any advantages?  Safe?

Hey everybody, I just took the risk and bought a GT 120 card for my early 2008 Mac Pro (to run the new cinema display) and thankfully everything is working fine! I guess running the GT 120 on older macs isn't technically supported.
In any case, on to the main question: I know the GT 120 isn't quite as good as the 8800 GT, so I took another risk and decided to see what would happen if I left the 8800 GT in slot one and put the GT 120 in PCI slot 2. I booted it up, and everything seems perfectly normal. I have the cinema display and a smaller samsung plugged into the GT 120 in slot 2, and system profiler shows both video cards installed correctly (nothing is plugged into the 8800 GT). My question is whether having these two cards plugged in is both safe, and advantageous in any way. I have the 8 core model from early 2008 with 8 gb of ram. Is my mac able to take advantage of these 2 different video cards? Any chance they could overtax the system? Is having the 8800 GT in slot one and the GT 120 in slot 2 the best layout?
Any tips or advice would be great!

Thanks for the info!
I had to buy the new card because the older 8800 GT doesn't have the mini display port that the new 27" cinema display requires. As far as I could determine, you can buy an adaptor to plug a DVI monitor into the mini display port, but you can't buy an adaptor to plug the 27"'s mini display port into a DVI port on a video card. It looked like there were some converter boxes available out there, but many were around the same price as the GT 120, and received mixed reviews. In any case, with the 8800 GT plugged into the main slot and the GT 120 plugged into the second slot with the monitors, is the 8800 GT even being used for graphics processing (After Effects, Cinema 4D, etc.)? Does it get bypassed altogether because the monitors are plugged into the GT 120?

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