We've already talked about Intel's super-overclockable low end E21x0 and E4x00 series CPUs, and the guys at Madshrimps have shown that the new stepping is no exception.
The new M0 stepping offers a lower range of CPU Vcore voltage, and the reviewer managed to squeeze an impressive 3.2 GHz from this $124 part.
At 1750MHz the E4500 worked at 1.288V, while at 3.2GHz the voltage was 1.368V. The E4400 used 1.096V at 1850MHz and 1.440V at 3.08GHz. At the stock 2.2GHz the M0 stepping E4500 works at 1.185V.
Read the original part here.