Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Pentium 4's FP ability is lower than Athlon64 1 time

  1. Jul 24, 2005 #1
    My computer is Pentium 4 1.6Ghz, I found some interesting discoveries recently. I used a CPU tested software Standard 2001 to test my P4 1.6Ghz's FP ability. I found that my P4's FP ability is not good as the P3 1 Ghz.

    P3 1Ghz has 13xx millions FP/s , Athlon4 1.33Ghz has 18xx millions FP/s, but my P4 1.6 Ghz only has 8xx millions FP/s!

    P4 is very slow and very bad on FP efficacy.

    How do you think about this? I think the Athlon series are the better platform's choice.
     
  2. jcsd
  3. Jul 24, 2005 #2

    russ_watters

    User Avatar

    Staff: Mentor

    Intel made a conscious decision with the P4 to chase clock speed at the cost of processor efficiency. The decision was partly due to some engineering constraints that made it difficult to push the p3 core any higher. Updates to the p4 core since have made it roughly equal to the p3 again in efficiency.

    However, new technologies such as dual core (two processors on the same chip) mean all of this is becoming irrelevant: For the first time since the P3 and Athlon were released, there has been a sudden and massive increase in processing power - with AMD coming out way ahead.
     
  4. Jul 24, 2005 #3
    Yes! I agree with you.

    P4 has 20 pipelines, but P3 and Athlon64 only have 12 pipelines. Therefore the Athlon64's branch prediction efficacy is better, and it has more workload per period, so the Athlon64's FP mark is higher. I rathan than to choose Athlon64. I am going to upgrade to Athlon64.
     
  5. Jul 30, 2005 #4
    I am quite certain that the p4 does not have 20 pipelines. Perhaps you mean stages?
     
  6. Jul 31, 2005 #5
    Sorry, I made a wrong. It should be P4 has a 20-level pipeline constructure.
     
  7. Jul 31, 2005 #6
    P4 has a low efficiency unless you take advantage of the SSE2 instructions.
    There are applications (like Prime95) where the P4 gives better performance/MHz than any other CPU, by a large margin (about 150% compared to an Athlon running at the same clock speed).
     
  8. Jul 31, 2005 #7
    As far as taking advantage of the SSE2 instructions, is this accomplished by the compiler or is it something the programmer has to do? Or I imagine it's probably some combination of the two.....

    Anyone know?
     
  9. Aug 1, 2005 #8

    russ_watters

    User Avatar

    Staff: Mentor

    Its mostly a function of the compiler, but I'm sure the programmer has to have a little to do with it.
     
  10. Aug 1, 2005 #9
    Yes, you are right. The p4's SSE2 efficacy is better than Athlon 64, but SSE2 is only clearly to improve the efficacy on graphics and sounds, but SSE series and MMX can not benefit the basic float points' operations. This difference between Athlon64 and P4 is clearly to appear in science study, smart robots, handwriting input, etc., also games. But the float points' operation proportion in games is only occupying a few. So the games' performance in P4 sometimes will exceed Athlon64.
    And I admit the P4's dual buses operate in simultaneity, it can has better performance. But you may be wrong in a point, "about 150% compared to an Athlon running at the same clock speed", the Athlon64's speed is PR value.
     
  11. Aug 1, 2005 #10
    Ei, I want to upgrade my computer to Athlon 64 3200+ or 3000+ very much, they are very suitable for me to view DVDs, VCDs and make websites. Only the woman is still hasn't come, I am very discontent, I have waited for many monthes, I really don't know what slow transport she is using. I will not content her intentions if she is too late. I know much about this, she has selfishness.
    When I got the money, I will spend much money to make a powerful computer by DIY, a Pocket PC, a smartphone, open a shop for selling computers and digi products... And the most important is I can have money to spend for amorism with my girlfriend.
     
    Last edited: Aug 1, 2005
  12. Aug 1, 2005 #11
    The Pentium M is a pentium III with a great big cache and outperforms the
    pentium IV with a lower clock, and with much less power consumption. The
    Pentium M is a good machine, comperable to the Athlons. I own them both.
     
  13. Aug 17, 2005 #12
    AMD Athlon64 and Pentium BOTH have up to SSE3 multimedia instructions... and in my opinion AMD is greater than Intel. at least for gaming.
     
  14. Aug 17, 2005 #13
    There was a class action lawsuit filed against Intel for this very reason. Intel touted the P4's as "more powerful" when the reality was the P3's outperformed the P4's for quite some time. Ealry adopters of the P4 got screwed.
     
  15. Aug 18, 2005 #14

    russ_watters

    User Avatar

    Staff: Mentor

    There was really a class action suit aginst Intel for that? I didn't hear about that one.... Do you have a link?
     
  16. Aug 18, 2005 #15
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Pentium 4's FP ability is lower than Athlon64 1 time
  1. Celeron or Pentium (Replies: 4)

Loading...