core have half their cache disabled, leaving them with only 2 MB of usable L2 cache. These Conroe-based E6300 and E6400 CPUs have the B2 stepping . The lower end E6300 (1.86 GHz) and E6400 (2.13 GHz), both with a 1066 MT/s FSB , were released on July 27, 2006. Traditionally,