Some one a computer us telling me the dual is better
he said
The 2.8 Pentium D Dual Core is two Prescotts sat side-by-side on a single processor socket, which means that both cores can run relatively slowly and still provide more computing power than the current Pentium 4. It won't break into a sweat with light gaming but you'll need to upgrade the graphics to run anything more serious like the current crop of 3D FPS's.
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decision to be made in 30 mins !