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http://support.hp.com/us-en/product/HP-Compaq-6000-Pro-Desktop-PC-series/4023814/model/4023815/document/c01865757#AbT0 That should tell you
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http://support.hp.com/us-en/product/HP-Compaq-6000-Pro-Desktop-PC-series/4023814/model/4023815/document/c01865757#AbT0 That should tell you