I'm considering upgrading my 2.5GHz C2D E7200 cpu to to something around 3GHz. Should I stay with the 7xxxx series with 3MB cache instead of paying more for the 8xxxx series with 6MB cache? I want to stay with a C2D for its low power consumption vs the C2Q. How much improvement in performance is gained by going with a 6MB cache instead of a 3MB one? Will it be more or less than 10%? I mainly use my PC for surfing the web and watching HD videos and DVDs. It's plenty fast as it is but I just want to upgrade the CPU when Windows 7 arrives.