This was occurring to me as well. I used RamMap and discovered in the File Summary that my total active was 61,655,876 K (basically 62GB of RAM being active on the file type). The file type is a .mrimg (Image File) created by a software used for backups called Macrium Reflect. I'm actually using Macrium Reflect to do a restore of about 600GB of data to one of my drives. Also, looking at Physical Pages, I'm showing my Macrium Image files as Mapped Files (at least a few thousand IF not more!). This seems to be an issue with software for me. I've only been using Windows 8.1 for a few hours now and already running into issues.
OK - Restore completed and I'm using 95.9GB of RAM (64GB Physical and 32GB pagefile.sys/ 256MB swapfile.sys). The second I unmounted the image, my RAM plummeted from 95.9GB consumed to 6GB! WoW! All I have to say is that I am opening a support case with Macrium. If this is the behavior to expect, then I'm getting a refund and looking elsewhere.
Not sure if this had any relevance, but if anyone is using the latest Macrium Reflect Pro, then expect this behavior on large restores. By the way, it took 2.5 hours for 600GB to restore.
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