Nehalem is fast

Discussion in 'Mac Pro' started by liquid stereo, Feb 2, 2009.

  1. liquid stereo macrumors regular

    Joined:
    Jan 21, 2005
    Location:
    Saint Paul
    #1
    I use a MacPro with 8 cores. I also use 8-core AMD (Shanghai) CPUs.
    I write my own parallel code (parallelized via MPI) and these codes scale linearly up to around 1,400 CPUs/cores.

    The new CPUs are ridiculously fast. By that I mean my codes are 2 to 4 times faster than the 8-core AMD.
     
  2. Tallest Skil macrumors P6

    Tallest Skil

    Joined:
    Aug 13, 2006
    Location:
    1 Geostationary Tower Plaza
    #2
    Yes, the Mac Pro is fast, but you don't have Nehalem. ;)
     
  3. liquid stereo thread starter macrumors regular

    Joined:
    Jan 21, 2005
    Location:
    Saint Paul
    #3
    Correct. But I've seen the performance of my codes on Nehalem. Its ridiculously fast for codes/applications that are memory-intensive.

     
  4. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #4
    I've also linked some geekbench scores in another thread, where a Core i7 920 was OC'ed to 4.2GHz, and kicked the crap out of the current Mac Pro.

    Tom's Hardware also has a performance chart comparing 3.2GHz Penryn and Nehalem (Core i7 965) to one another. Very good results, and by extrapolating, will be worth the additional $$ IMO. ;)
     
  5. liquid stereo thread starter macrumors regular

    Joined:
    Jan 21, 2005
    Location:
    Saint Paul
    #5
    Performance really depends on code

    The performance I've seen really depends on code/algorithm.
    Codes which are memory limited will show the greatest performance increase.

    Codes which aren't are going to scale with clock speed. Meaning for some calculations the 2.8GHz Nehalem will be slower than the current 3.2GHz Xeon.

    Fortunately my codes are memory intensive and show significant speed-up.

    Cheers!


     
  6. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #6
    I know. ;)

    The chart posted by Tom's made a decent attempt at using enough of a variety of commonly used apps to give a more well rounded outlook. :) Broad enough, it can be of use to a fair number of users. :)

    Email and web browsing won't be significantly faster, but the EDA package I use is another story. :D

    The code will hopefully progress enough where it can utilize such a system, but another two generations of hardware may be out by then. :p
     

Share This Page