Have functional difference with GPU acceleration and software processing of Mercury Playback Engine?

Used Decklink SDI and Premiere CS6 to testing.
I have a question~Have functional difference with GPU acceleration and software processing of Mercury Playback Engine?

(Can GPU acceleration export same used 59.94i external monitor export?).

IN specification,Is it need“software processing”? whether other restrictions?

 

If Anyone know please tell me.

thank you.

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