w0oter :
Best answer selected by w0oter.
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nIt seems you selected my original post as the "Best Answer" while I was in the middle of editing it.
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nAnyway, like the original post stated the Athlon II X4 630 is not an ideal choice since the Phenom II X4 925 provides a little better performance for not much more money.
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nThe Hyper 212+ heatsink as recommended by
jjb8675309 is a good choice. It is very effective for the price that you pay.
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nSure, there are better heatsinks around, but they also cost more.