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.
Core 2 Duo E8300