Neoseeker tries out the AMD64 4000+, pairing it with DDR600.  They managed to hit 2.7 GHz from the 2.4 it ships at, and they include hints for reaching it yourself. 
“The 4000+ is a very good overclocker – or at least the part we had a chance to play with. As you can see from our charts the performance is very nice when the processor is overclocked. I ran the processor at 1.5V, the memory at 2.7V with 2.5-4-4-8-2T timings and the HT multiplier at 3x. Using a 9x multiplier and a 300MHz memory bus allowed us to reach 2.7GHz with a very high maximum memory bandwidth.”

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