HD play it's cpu consuming and not GPU. So, in this case, your grafic card does not have any influence. BIOS memory allocation is for 3D texture (games) no use in this case.
So, at this moment, which decoder it's used ? CoreAVC or ffdshow ?
If you don't need AERO while watching a movie, my advice is to use old rendering engine and internal renderer (default) for video. Screen will flicker for a second when movie starts / ends.
By the way, what's the audio decoder ?
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