Originally posted by cheadley
That's right. To clarify, remember that the Power4 chips that the 970 are based on are actually running with SLOWER Ghz ratings than the 970. Although I'm not an engineer, it's obvious from reading IBM's website concerning the differences between the Power4 and the 970 that the Power series intentionally runs slower than the 970 and future derivations. The reason is that the Power series is intended for servers and has greater error checking and general stability. Even though the Power5 will have a somewhat "slow" rating compared to what we're hoping for, its derivations made for Apple will be MUCH faster.
Despite that IBM seem very conservative with their projected frequency ratings (I'm remembering the 970 was going to top out at 1.8Ghz, not start there...) the Power series chips have very thick oxide gates to increase their stability (fractionally) - this also reduces the frequency they can run at.
I believe the 970 uses cow'ide gates instead, and while not as good as raw'ide gates, should do us just fine.