L3 cache or quad-core
- manu
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16 years 2 weeks ago #3531
by manu
L3 cache or quad-core was created by manu
I'm in the process of upgrading my motherboard/RAM and CPU. I'm opting for an AM3 board with DDR3 RAM (for sake of upgrade longevity). I'm debating between an AMD Phenom II x3 720 CPU and an AMD Athlon II x4 620 CPU. Will CAELinux benifit more from (1) a quad core with no L3 cache (Athlon) or (2) a tri core with 6 mb of L3 cache (Phenom). Also, the clock speed of the Athlon is 2.6 GHz while that of the Phenom is 2.8 GHz. Many years ago, large L1 and L2 caches were considered valuable in floating point computations, however, it's not clear to me if a lower level 3 cache provides the same benefits.
- Joël Cugnoni
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15 years 11 months ago #3596
by Joël Cugnoni
Joël Cugnoni - a.k.a admin
www.caelinux.com
Replied by Joël Cugnoni on topic Re:L3 cache or quad-core
hi
difficult to answer without testing, but it depends mostly on which application you intend to run:
- for Aste or single threaded apps (Salome, gmsh, elmer): the parallel speedup is not optimal; so a high clock-large cache cpu with fewer cores is better
- for mpi cfd codes (openFoam, Saturne): due to a good scalabilty, a larger nb of cores is better
Joel
difficult to answer without testing, but it depends mostly on which application you intend to run:
- for Aste or single threaded apps (Salome, gmsh, elmer): the parallel speedup is not optimal; so a high clock-large cache cpu with fewer cores is better
- for mpi cfd codes (openFoam, Saturne): due to a good scalabilty, a larger nb of cores is better
Joel
Joël Cugnoni - a.k.a admin
www.caelinux.com
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