Slow preview playback in After Effects

Hi Folks
I just recently set up CS6 on a new z820 workstation and for some reason my after effects timeline does not playback in realtime when previewing. Everything is green on the timeline, yet when it plays it is about half speed. I have no doubt my system has the specs to play rendered media in real time (2x8core, Quadro 4000, 64GB Ram, Sonnet hard drive array) so obviously I have something set up wrong. I'm running a Kona 3 with the latest drivers and I suspect this is the culprit. I've had other issues related to the Kona, such as losing display to my external monitors sporadically. It will be fine for a while then suddenly the output signal turns either solid green or some form of garbled junk. Very strange, although the Kona output seems perfectly fine when I'm in Premiere.
Anyhow, any help zeroing in on the problem would be greatly appreaciated.
Best,
EE

Thanks Tom
However, I do think I have playback set to computer monitor (not in front of system right now). Definitely seems like there's something AE doesn't like about my card (it is an older version of the Kona 3). I have a support ticket in with AJA so hopefully that will turn up something.
As far as my Quadro 4000 goes, I was kind of forced into using it on account of other software on my system. If it was up to me, I would have put in a GTX680 or 690. I have a GTX680 at home and it is rock solid in AE and Premiere. Timelines that are heavily dependant on GPU accelerated FX render about twice as fast on my 6-core/GTX680 vs my z820/Quadro 4000 work system. I'm hoping to upgrade to the Quadro 5000K when it comes out, possibly with the Tesla sidekick. In the meantime, I have to sort out this Kona thing

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<languageVersion : 1.0;>
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Thanks,
Christian

I've figured it out.
If you test like so, it works!
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Christian

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