"After playing around with this card for a while, I started tinkering with overclocking. I quickly learned that the core and the memory speed were locked together at 175/175. This seemed to be a pretty conservative setting. The chip doesn't run too hot, and the memory is spec'd for 5ns (200 mhz) operation. Time to overclock. The highest I was able to achieve was 185/185. Something's wrong!"
FULL STORY @ PROCOOLING (http://www.procooling.com/articles/html/kevin_s_uber_fast_kyro_ii_mod_.shtml)