Can I put ATI Radeon HD 5570 PCI-E Graphics Card - 1GB in ACER X3910 PC?

Newer ATI cards have a technology called "Eyefinity" It's their brand marketing for the 3 monitor output. It essentially can wrap images to span all 3 monitors in a panoramic view or you can isolate each monitor to work independently as desktop space. Not all ATI cards are capable of 3 monitor output so you need to double check and make sure the card you have has the Eyefinity technology.

The other port you're probably referencing is called "Display Port" and is rather new in terms of input for monitors. I've heard mixed things about using an adapter and depending on whether your monitor needs an active or passive adapter. Ideally you would want to use a newer monitor that supports Display Port Input to eliminate any issues.

I somehow have the feeling that "some other port" was probably video out, seeing as how this is a video card.

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