I recently purchased a 2012 Mac mini, i5 processor, 4GB RAM, 500GB hard drive. I upgraded it to 8GB a few weeks ago. It was using about 1GB idle when it had 4GB RAM, but now it is using 1.7GB. After looking at other Macs at my school, it seemed that they were using around 0.9GB less RAM than mine. Is this usage abnormal? I have three dashboard apps and I frequently quit applications to free up memory, so neither of those could be the issue. Does anybody have thoughts or suggestions?