Yes, it does support 1 CPU config, I think it does support anything in if it's PCIe x16 slot as long as card gets enough power, and I really doubt this PCIe slot provides full power as it should and as it does on desktop; Windmill does support Win 7, I think 8 and 8.1 too (some other open compute I think named "Wiwyan" doesn't support Win 7)Well I wasn't aware of anything obvious but apparently After Effects has some single core bottlenecks though I rarely use that at this point, I don't see much listed for Premiere.
Honestly if I could throw together a Windmill based workstation that might well be perfect - new enough Sandy Bridge cpu's, sounds like I can throw at least 128gigs there, if I literally see prices of $30 per 32gigs i'd just say the heck with it and go to 128gigs right away and not look back - I just considered those prices unattainable so was designing around RAM price bottlenecks.
I read through the 33 page Windmill deals discussion but questions i'm still left with are what's the newest supported videocard (someone reports a 950 GTX, my goal would be a 1050 GTX Ti and i'd be fully content with that for the time being - faster better even if an external PSU were needed), whether the system can work with only one cpu socket populated (if I want to upgrade later - i'd be tempted to kit out boards inexpensively on the cpu's to start and wait for prices to drop further honestly since they always seem to be trending down), and just how reliable it is to put together a working system. Reports of Win 7 working vs not working, a certain video card supported or not supported gives me a little hesitation. I'm also for having two nodes in the same box since one of the goals was two PC workstations per person - one for background processing processes powered up on demand plus the 'foreground' PC for continuing setting up other edits and such for instance.
I could quite happily design around a Windmill system if there's a good reliability of putting together a system where all the drivers and such work with something like the 1050 card. That would make me skip most talk of trying to cheap out with much older hardware because the price entry points for the performance i'm totally content with.
A year ago you could buy 1033MHz RAMs for even cheaper, for even cheaper, slightly cheaper.