Intel Core 2 Duo E4500
Clocked at 2.2GHz with a fairly slow FSB of 200MHz (QDR800). With this CPU Intel created a budget line of Core 2 Duo's that would fill in the gap with the original Core 2 Duo E6xxx-series and the Pentium Dual-Core.
Due the fairly low FSB it was easier to overclock these CPU's while staying within reasonable specs. You could gain up to 3GHz with the standard 266MHz (QDR1066) bus frequency.