4K videos stutter on 2011 Mac Mini with AMD 6630

I have a Dell 4K monitor and while it works perfectly with MDP to MDP cable @ 2160p and plays back videos up to 1080p with no issues, trying to play 4K movies or trailers results in choppy, video that is virtually unplayable.  Is this a function of the video card or a combo of the i5 and video card.  Of course videos play correctly on my Windows gaming laptop.
Cheers,

From the 2011 Mac Mini Tech specs:
Video Support
Works with almost any display or HDTV.
Thunderbolt port with support for up to 2560-by-1600 resolution
HDMI port with support for up to 1920-by-1200 resolution
DVI output using HDMI to DVI Adapter (included)
Support for dual display and video mirroring

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