4-GHz smigahertz. Why can't we have by now at least a 1-Ghz frontside bus? 800-MHz ain't bad, but we can't truly realize these higher processor clock speeds with a woefully inadequate frontside bus.
Intel is certainly not alone in having problems going to 90nm. There isn't a manufacturer out there that isn't having difficulties with the yield rates. Moore's law just hit a roadblock . . .