You probably need a EVGA SR2 and dual overclocked xeon
Dxva currently only support up to 1080p. if im correct.

The video you are playing are obviously way out-of-spec.

Change media player wont help, basically all media player will use the same video decoder, unless the video player isnt directshow-based.

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Added on December 26, 2010, 1:26 amWhats the default video renderer you were using?
perhaps change the video renderer to "EVR" since its faster than other advanced 3d renderer, but you will lose softsub support.
2160p quite taxing if running on the EVR custom presenter since its rely on your GPU processing power.
Full bitstream decoding is fastest but i think it has many limitation, while currently no decoder on Windows support Partial acceleration so you are out of luck.

There is a DXVA-HD, prolly support the 2160p or QuadHD, i guess you have to wait the mpc-hc developer to implement it.
IF you are dying want to play the 2160p without overclocking you cpu like a mad, you may try your luck and use *unix OS and change the GPU to nvidia to utilize the hardware acceleration: VDPAU

CoreAVC is the fastest software decoder, but the CoreAVC GPU acceleration only works with nvidia GPU
because it utilize CUDA, while no software utilize ATI Stream
If you still have to OC your CPU to 4.5GHz when using CoreAVC, theres prolly no hope for using other software decoder.

This post has been edited by 1024kbps: Dec 26 2010, 01:39 AM