Thx. was not sure about it!
My old laptop was 800 ghz, 1 gb ram and Ati Radeon 3100:D But anyways I had no screen lagg at all:D
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If for overclocking definately AMD, if you're useing the system normally without Overclocking go with an Intel.
For sheer performance:
http://www.azuma-kinba.com/wp-conten...-bulldozer.jpg
Don't forget that you can't just put an other processor in your motherboard. The processors have all different sockets.