"Overclocking the processor on the Intel board was a pretty easy since the only options available to manually adjust the performance was the bclock speed. Even so, this processor was able to run up to a 3.85GHz clock speed by increasing the bclock speed to 153Mhz with a 25 clock multiplier. This gave me only about a 400Mhz increase over the 3.46Ghz speeds I was seeing when using Intel's Turbo Boost option."
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Original URL, circa 2010: http://www.overclockersclub.com/reviews/intel_core_i5_661/