On Mon, 16 Jul 2007 00:31:26 +0800, Johnny Luo wrote: > > ... why IBM doesn't increase the clock of mainframe CPU? >There is no need or there are some technical problems?
Actually, IBM is an acknowledged leader in processor design and microelectronics technology. I would suggest you read some of the articles in http://www.research.ibm.com/journal/rd51-12.html . Particularly, http://www.research.ibm.com/journal/rd/511/mayer.html . For some additional background, see http://www.research.ibm.com/journal/rd50-45.html http://www.research.ibm.com/journal/rd48-34.html http://www.research.ibm.com/journal/rd46-45.html You might think that 1.7 GHz is slow when you hear about Intel processor clock rates, but z/Architecture is considerably more complex than any Intel processor. It is quite remarkable that such a large and complex processor is able to achieve a cycle time that is equivalent to the time that it takes light to travel about 7 inches. -- Tom Marchant -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
