FSB is nice but doesn't mean ya CPU can breach 4ghz unless you whack insane voltages coupled with extreme cooling

Newer E8400 Wolfdales top out around 4-4.2Ghz stable at reasonable voltage levels (sub 1.4Vcore) for most users... while they can breach 550FSB doesn't mean they can go up to 4.5ghz and higher stable... Sell that E6850 and go wolfdale it will make life easier on ya...