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Via LAN maybe, as a render client.

Why would you wanna do this?

I mean, the MacPro is more powerful than the iMac, so why not use the MacPro?
 
Well it's a temporary solution to a problem I have. I'm trying to capture video via capture card for video projects, but most HD cards at a reasonable price are internal. An internal card won't work with my iMac, because there is no place to put it, so the idea of getting a cheap processor would solve the problem if I was able to connect it to the iMac somehow.
 
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