tri channel is i7 thing only
amd cpus have dual channel memory controllers, it is said by amd i remember seeing somewhere tahat they will have four channel mch in the future but only on the opteron cpus if i remember right
btw tri channel doesent bring any real world performance advantage, it is somewhat a conspiracy(lol) to buy tri-channel kits thus giving more cash
and is raeally showing performance increase in sinthetic bandwith benchmarks!
like sinthetic is allways quite far from reallity except in relative terms between hardware