[SOLVED] What memory is best?

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http://ubuntuforums.org – I have bought a laptop, and I noticed that now they've changed some hardware in the laptop. I will get the laptop with 4gb DDR3 1333MHz RAM People that buy the same laptop today will get 6gb DDR2 800MHz RAM What is best? 6gb DDR2 800MHz or 4gb DDR3 1333GHz (Hardware)