would you want help to figure out a compliacted math problem? or would you rather do it by yourself and take twice as long? the 4000 is good but with dual core it's like having 2 brains on one chip. the Ghz doesn't really matter. It's not like INTEL who clock everything using that number (2.8Ghz, 3.0Ghz, etc...) just trust us when we suggest to go with the 3800 dual core.