[RC5] P4 Speed Question

Colin L. Hildinger colin at ionet.net
Mon Jun 11 00:08:39 EDT 2001

First, understand that, by its nature, the P4 does less per clock than the P3.  The P4 was optimized to satisfy the marketing department's requirement for a high MHz/GHz number, not for the best overall performance, and a 1.5GHz P4 performs worse than a 1GHz PIII on many applications, particularly x87 floating point.  There are any number of very good articles on the subject of the P4's underwhelming performance, I recommend starting at the following sites:


  ----- Original Message ----- 
  From: Gregory S. Hopkins 
  To: rc5 at lists.distributed.net 
  Sent: Sunday, June 10, 2001 5:41 PM
  Subject: [RC5] P4 Speed Question

  After unpacking my new Dell Dimension 8100 with a P4 at 1.7ghz , I was expecting a SUPER increase (at least double) over my P3 500 overclocked to 620. 

  However, I am quite disapointed. It seems that Dnet is not optimized for P4 or something, because the 620mhz P3 can do approx 1,677,500 keys a second, but the P4 at 1700mhz can only do approx 2,313,000 per second. This is a HUGE disapointment. Is there anything I can do to improve this, or am I stuck waiting for a new version?

  Also, the P4 is supposed to have the full P3 instruction set, right (plus some). Why isnt the keys/sec nearly triple (like the mhz is)? Even if the P4 was acting like a P3, its still doing it nearly 3 times faster.



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