A 2.8 with dual-channel should perform similarly overall to a 3.0GHz with single channel. Also, it will perform much better in certain applications that rely on constant RAM tranfers, such as games and some other 3D applications.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>