Which CPU upgrade? Intel Core 2 Quad Q8200, or the Q6700?
cpu Core 2 Quad Q8200 2.3 GHz Quad-Core CPU Processor 4M 95W 1333 LGA 775 Run quickly to help you run your computer. : Amazon.co.uk: Computers & Accessories
Intel Core 2 Quad Q8200
Intel Core 2 Quad Q8200 Specs | TechPowerUp CPU Database