For the best prices on CPUs & Computer Processor Upgrades check out BizRate. Find consumer ratings on Computers & Software stores. Compare CPUs & Computer Processor Upgrades from top brands like HP, Intel and AMD and IBM, Dell and Sun. There are many CPUs & Computer Processor Upgrades in the marketplace, so research before you buy. BizRate can help you check prices & product specifications. Narrow your choice to the product that is right for you: Intel Core 2 Duo E8400 3.0 GHz CPU or Intel BX80571E5200 Core 2 Duo E5200 2.5 GHz CPU - Boxed Retail.