If you wanted you could always set it up as a VNC client using the Mac's inbuilt Per User Screen Sharing (available since OSX Lion) and have your new iMac become the server and do all the processing and your old one with the nice screen useful as a workstation - then you will have two fast, lastest version OSX iMacs !
Any of the users logged in this way will have their own complete virtual machine running independently but simultaneously.
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