When beta-testing Win7 (months ago) I also noticed the hardware reservation of my memory. The reservation was caused by the GRAPHICS driver. I suggest delving into your graphics driver and/or graphics control software to look for solutions. Also, beware using 2 different class memories to buffer your GPU (i.e. DDR5 on-board Graphics ram w/ DDR3 Win 7 OS-buffering.) I will look deeper into the disabling of OS-Graphics buffering and get back with you.
*EDIT*- >> Look for a "Turbocache" setting.
*EDIT*- >> Look for a "Turbocache" setting.
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