That 6000+ is a 3.1ghz 65nm Brisbane chip. You're better off with a 3.0ghz 90nm Windsor chip, also named 6000+. The AMD naming scheme is pretty bad, the "6000+" is supposed to denote performance, but they're not the same, and obviously neither can come close to a 3.0ghz Intel dual core. The new one perform worse than the old one despite being 100mhz higher clocked, due to smaller L2 cache and higher latency.
Performance of the 2 6000+ chips.http://hothardware.com/Articles/AMD-Athlon-64-X2-65nm-BrisbaneCore/?page=10
Price for Windsor 6000+ is lower than Brisbane.http://www.newegg.com/Product/Product.aspx?Item=N82E16819103233http://www.newegg.com/Product/Product.aspx?Item=N82E16819103272&guid=d25224752a604d129ab036235eaa0d00