I run 12Gb & it's hard to get over 1600/1700 mainly because you need high vQPI for running 12Gb & as I believe it will also depend on your particular CPU sample (internal memory controller quality)
It's nice to run without pagefile, windows is more responsive & games load quicker, although there's no performance increase, at least that I have noticed.
Things get a bit more complicated with 12Gb but it's deffinately attainable together with a nice CPU OC, you will need to slowly raise vQPI & maybe loosen a bit some subtimings
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