Well, I am building a computer for a friend. Multitasking, Word, Excel, Internet, iTunes, thats it. Would you recommend the Athlon x4 620 (quad core but no l3 cache) or the Phenom X2 550 BE (dual-core, faster clock)
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Yes I would recommend Athlon II 620 because it is a quad core with a good multitasking ability. L3 cache benefits are largely in the gaming area, so I would not worry for those uses above mentioned.
The X2 if only for gaming. All other applications the X4 it is built for multitasking.