Resolution loss in multicam when GPU acceleration enabled

Hello all,
Strange multicam problem here. I know others besides me have struggled with multicam playback resolution, but at least on the surface, this particular problem seems counter-intuitive.
When I enable GPU acceleration (I have a GTX 650 Ti BOOST), playback resolution is decreased in the multi-cam monitor. With CS5.5, this was extremely noticeable; now in CC, it's less apparent, but still detectable. The footage will blur slightly when playback begins, and then sharpen again when paused. If I disable GPU acceleration, playback resolution in the multicam-monitor is the same as the paused resolution.
Is this a bug, or something that should be expected? I can live with this, but it'd be nice not to have to disable GPU acceleration for multi-cam, and then re-enable it for other tasks.
Thanks in advance.

Update: At least in some cases, I can see that the paused image is sharper with GPU acceleration enabled than the paused image without it. So the playback resolutions may well be the same with or without GPU, and all I'm seeing is a greater difference between playback and paused during GPU acceleration. Also, there may in fact be a drop during playback resolution in software only mode, albeit less noticeable.
(As mentioned though, this was certainly an issue I experienced in 5.5; don't know if anyone else has experienced something similar.)
My new question would be, is it possible with the right hardware to guarantee full resolution playback in multi-cam? I'm currently editing 4 cameras: 2 5DMIIIs, a GH2, and a Sony NX5U. Editing system is comprised of an i7 4770K overclocked to 4.2GHz, 16GB RAM, GTX 650 Ti Boost, and three HDDs: an SSD for OS and Programs, a 7200 for media and projects, and another 7200 for pagefile, previews, and media cache. Would creating a RAID 0 for the media files help at all in this case? Or is the drop in resolution I experience something I likely won't be able to change?

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    To: [email protected]
    Subject: premiere CS6 crashes after enabling GPU acceleration
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