tell him these chips are pretty bullet proof as far as overclocking goes, i have abused mine and it still works away happily at 3ghz all day long (67% overclock) it would go higher (around 3.3ghz) im sure if I had bought some decent ram as i tested with my bro's crucial 800 ram.
I had never OC'd anything before the e2160, and found it to be simple, more than simple.
uped the fsb to 333mhz, set ram to ratio of 1:1 - off we go...