Hey guys I need your help! I bought two 8Gb sticks of Crucial PC-12800 RAM to augment the two 4Gb ones that come default from Apple. Everything comes up great with a single tri-tone "bong" and the system runs fast so I haven't given it much thought in the week and change since it arrived. I've been running old/new x86 apps (came from a PowerMac Dual 2.3 G5), doing a ton of blu-ray encoding/burning form Toast 11 and even Win7 and Win8 under Fusion 5 with 8Gb of RAM assigned to the VMs. So the 24Gb of RAM has had its workout. However, like all people who've just bought a new computer or have added a performance related upgrade, at some point I looked for performance benchmarking apps to run and ran geekbench. http://browser.primatelabs.com/geekbench2/search?utf8=✓&q=iMac13%2C2+3770 While my score of 12878 is right in the pack for even those whose memory shows up as 1600MHz, it was this and the thread of "show your About This Mac" that finally got me to notice the 1333MHz instead. I'm about to run memtest to see what's going on. One thing I've done is to pull out one of the 8Gb Crucial sticks to at least see that it's labeled 1600MHz just in case I received the wrong product. The other thing I intend to do is to leave in just the apple ram and then just the crucial ram and see what the profiler shows. Any insight? Thanks!