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Subject: Re: Why is P4 less efficient than Athlon (or P3) for chess programs ?

Author: Russell Reagan

Date: 13:23:10 07/03/03

Go up one level in this thread

On July 03, 2003 at 15:02:55, Joachim Rang wrote:

>The main reason is, that Athlon and P3 have 9 instructions per cycle and P4 has
>only 6.

Also the length of the pipeline on the P3 is 10, which means that a mispredicted
branch costs 10 cycles. On the P4 the length of the pipeline is 20, which means
it costs 20 cycles for a mispredicted branch. I may be wrong about the actual
numbers (10 and 20, but I think they are close). I'm not sure what the length is
on the Athlon. Anyone know?

• Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Tom Kerrigan 13:48:07 07/03/03
  • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Vincent Diepeveen 11:37:37 07/04/03
    • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Jeremiah Penery 14:01:36 07/04/03
      • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Vincent Diepeveen 15:21:08 07/04/03
        • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Jeremiah Penery 18:21:47 07/04/03
          • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Tom Kerrigan 18:44:06 07/04/03
  • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Robert Hyatt 16:38:29 07/03/03
    • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Tom Kerrigan 17:11:24 07/03/03
      • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Robert Hyatt 20:26:56 07/04/03
        • Re: Why is P4 less efficient than Athlon (or P3) for chess programs ? Tom Kerrigan 14:19:50 07/05/03

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