Interesting to note that IBM's SOI .13 micron fabricated chip is clocked ~1.8 Ghz, while AMD?s non-SOI .13 micron fabricated chip is clocked at ~2.2 Ghz now.
fabing 64-bit chips at high clock rates is a lot harder then fabing 32-bit chips at the same clock rate. that's why AFAIK Intel's IA-64 chips clock at a bit over 1 GHZ, while the P4 clocks at 2.5Ghz.
