Does anyone else have the upgraded 2.8Ghz CPU on their macbook pro 15"? This is supposed to turbo boost to 4Ghz in certain circumstances (i.e. single core use) but my system is only getting 3.8Ghz when I max out one core. I understand there are certain factors involved but it doesn't even spike to 4Ghz. If anyone else has this system could you do this quick test and let me know the figures: 1. Open the Intel Power Gadget 2. Open Terminal and type "yes > /dev/null" (without quotes) After a few seconds you should see the Frequency in Ghz of the CPU. Can you report it here? I'm curious to find out if it's just my machine or all 2.8Ghz chips in the MBP, maybe they aren't capable of the full 4Ghz in these chips and apple didn't test correctly!