Or do I really need any extra hardware?
I'm running Production Suite CS5 on a Dell Precision M4500 laptop, i7 Core 840, 8 GB RAM, Windows 7 Ultimate, Nvidia Quadro FX 1800M.
...we have a huge archive of Beta tape that is often useful for historical purposes or filler as we work to rebuild our library in HD. I have been doing a bit of experimenting to make sure we will still be able to utilize our deck with an Adobe system. It seems that the Nitris DX box is taking care of analog to digital conversion when capturing from or digitizing to tape.
Rather purchasing another standalone A/D converter, I came across this:
Would this or something like it allow for capture?
That one - no; among BMD cards, you'd need an Intensity Pro ($200) or a Decklink Studio ($695).
If you like the look (and features) of Nitris DX, check out Multibridge Eclipse. More than likely, Nitris DX is its step-child...