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CFD Workstation – RAM size & CORES number

    • StacyLab


            I need to select a good workstation for CFD modeling in ANSYS for my Lab to buy. 

      I understand that there's 25-40% decrease in simulation performances if all memory slots are not filled with the same amount of memory. - The specs of a DELL workstation option are listed below. I have 2 quick questions related to RAM choice:

      1. Are 64GB (8x8GB) or 96GB (4x16GB + 4x8GB additional sticks) valid options? 

      Or is it worth to consider reducing the cores number (for instance, 8C instead of 10C) and invest in larger RAM (8x16GB=128GB, for instance)?

      2. Do I really need 192GB of RAM to match the minimum memory requirement?


      Budget is ~ $6-7k. The workstation is needed for time-dependent, rigid-wall simulations (2M element mesh). As reference, I used to run these simulations on *2 CPU of 8 cores each (DELL Intel Xeon CPU 2650 0 @ 2.0 GHz), 64 GB of RAM, and 2 HHDs of 2TB each*. - The simulation would run for 2-3cycles in 4-6days.

      Thanks a lot in advance for your help!


      Full specs (DELL Precision 5820 Tower):

      Intel Xeon W-2115 (3.3GHz, 4.5 GHz Turbo, 10 Cores, 13.75MB Cache)

      64-96 GB RAM

      INVIDIA video card P4000 (8GB, 4 Displayport 1.4)

      Operating System: Windows 10 Pro

      Precision 5820 Tower 950 Chassis

      Hard Drive Controllers: Integrated Intel AHCI SATA chipset controller (8x 6.0Gb/s), SW RAID 0,1,5,10

      Hard Drive: 2.5” 512GB SATA SSD

      2nd Hard Drive: 2.5” 1T SATA SSD

      3rd Hard Drive: 2.5” 1T SATA SSD



      *edited for clarity - apologize for confusion*

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