Stuttering Playback on iMac

I am experiencing stuttering playback and a strange noise on playback especially when unrendered h.264 is involved.  When it works, it works fine but occasionally this will happen:
www.givethatmanajob.com/Public/issues/StutterPlayback_a.mov
I am suspecting my GFX card may be having trouble. All software is current. Any throughts?

Sometimes I do transcode, sometimes not.  The problem happens intermittantly regaurdless and I started to suspect that it was h.264 that was given issues most of the time so I shot some test video on an iPhone.  In the original post the video I linked to shows footage that was *not* transcoded.
Coming from an iPhone means nothing, especially as the iPhone, whatever iPhone this is, shoots non-standard video formats.
An iPhone 4s shooting h.264 1080p .mov
In the world of tapeless media, this is pretty standard.
I understand that H.264 is a long GOP format, and not optimized for editing hence the desirability to transcode to an intraframe codec such as ProRes. However, one of the features of FCPX is that it is designed to handle h.264 footage because a lot of video is shot that way these days.
Coming from an iPhone does not mean nothing. It means the company that designed the software capable of editing h.264 also designed the software and hardware that shot the footage in h.264 format. It means we can expect that at least some thought was put into them playing well together. It means that if I shoot some test video on an iPhone, put in on an iMac running FCPX without filters I should be able to expect smooth playback all else being equal.

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