So, I just bought some upgrades for my Early 2011 15" 2.0GHz Core i7 MBP. I got a 256GB Samsung 840 Pro SSD and 16GB (8x2) Crucial Brand RAM. Everything installed just fine, fresh new copy of 10.8.4. Ran Apple Hardware Test - Everything OK No problems found. Both Intel and Apple state the 2.0GHz i7-2635qm in my machine is only capable of 1333MHz memory. I purchased 2 sticks of Crucial #CT102464BF1339 8GB memory which is rated at 1333MHz with a voltage of 1.35V. My machine now shows the memory running at 1600MHz. Both the OS, System Diagnostic, and Apple Hardware Test show 1600MHz. Is this possible?