Well as it's already been known the mobile XP's are awesome overclockers compared to their desktop counterparts thanks to of course the lower wattage, vcore, and above all less heat thanks to the decrease in power consumption.
I've been reading quite a bit on it and it seems that the 3400+ Mobiles are getting some really nice overclocks on air at that, reaching 2.7GHz with people having 275x10 to achieve it meaning they are basically having DDR550 with that.
Of course these mobiles are only on socket 754, so in the future you either gotta hope they make it for socket 939 or just do without dual channel.
Either way, I'm definitely thinking that will be the route to go in a year or so when I upgrade.
So anyone considering going to AMD64 should consider that as a good viable option. If you have your RAM up at DDR550 it won't really matter if you don't have DC.