It says that the Quadro FX 4500X2 uses the G70GL chip, which is basically the same chip that was used in the 7-series GeForce cards. The first graphics cards to support CUDA were the 8-series cards that used the G80 chip.
Unfortunately, graphics hardware is changing at a phenomenal rate these days (and really has been for the last decade or so); not just performance improvements, but design improvements as well. CUDA requires certain hardware features that the older cards simply don’t have, and so it’s not backwards-compatible with any cards prior to the 8-series. Even if it was, you would probably get very poor performance from it.
If you really want to use CUDA for your video editing studio without spending a lot of money, consider purchasing a GTX260. They can be had for around $150-170, and they also support the latest CUDA features (note: thats GTX, not GTS, which is based on a slightly older chip). And it should have much faster performance than your Quadro.
Sorry, there’s no way. It has to do with the design of the chip. The chips used in cards prior to the 8-series (like your Quadro) were only designed to be graphics cards, and not for GPU computing use. If you want to read more about it, Wikipedia has a pretty in-depth article on the history of GPUs:
I’m not 100% positive, but I don’t think that any of the GeForce cards support 4 monitors. If your motherboard has two PCI Express x16 slots, you could get two of them though, which would handle 4 monitors (2x2). I don’t know about the Quadro cards, you’ll have to do some research on those to find out.