I have the 4gig LAA patch, but skyrim still only uses 2gigs. I don't know if its even using that much. I have Task manager running in the background, and the chart only shows 2gigs being used.
Also, I found a weird glitch. I was messing with my RAM, trying to get it to run at 1866, and I screwed up some timings in windows, and didn't realize it but started skyrim, and fraps read 650 fps. So, when I moved, I was running like 200mph! Time also goes really fast at that speed.
So I ran around and discovered a bunch of stuff I had never seen before, between riverwood, solitude and dawnstar. also markath. Its almost as fast as fast travel. You just have to be careful around cliffs and things. I think my ram wasn't actually doing anything; or maybe all 8gigs were being used, idk.