Does a capture card improve real time functions?

I am reading posts regarding capture cards and i figured for DV material, capture card may not be necessary as firewire is there. but does capture cards improve the effeciency of the machine /CPU , does it render faster and play more real time effects?
thanks
sameer

The Aurora is a Standard Definition card and the Decklink is an HD card. I don't have them both installed at the same time...I put in what I need. Right now I am working with HD so I have the decklink card in.
AJA I/O is a standard definition "solution." I say solution because it isn't a capture card per se, but rather an external box that captures SD signals (SDI, Component, Composite) and inputs them into FCP via a firewire connection to the computer. This allows it to be used on multiple machines easily. The Kona series are High Def cards that need to be installed in the PCI slots of your computer.
What is my workflow with the DSR-11? Probably the same as you. DV/NTSC Easy Setup, then connect it to the computer via firewire and capture. When I am done, I output back to tape. What else is there to do with this?
Codecs? DV, 8-bit uncompressed SD, DCPRO 50, DVCPRO HD. Depends on the project I am working on and how it was shot.
10-bit uncompressed DV? DV by nature is compressed 5:1 when it is recorded to tape. When you capture that via firewire from your DSR-11 deck, you are capturing it at the highest possible quality. It is simply a file transfer. Now, if you were delivering on DV then you don't need a capture card. But if you were, say, needing to deliver a digibeta master, or betasp, then you'd need a capture card to output to that format...uprezzing the DV footage to 8-bit uncompressed (better color space, beter codec for graphics and stils) and output. 10-bit is overkill for DV.
My workflow depends on the footage I am given and the format I need to master to. My HD workflow differs greatly from my DV workflow, which differs from my SD Uncompressed workflow. To go into detail of each would mean writing an article, and I am too busy editing to do that.
Shane

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