that's huge dude, i got duron 800MHz and when i overclock it over 880MHz my pc doesn't start if i don't reset cmos, and that guy overclocked 1500MHz!!! wow
after waiting so long it's too late for me now to buy 5660 with R9000, better to wait couple more month then be sorry, and i know my luck if i buy 5660 with R9000 the next day both 3.06 and R9700 will come out, and i'll be sooo pissed off