CFD Workstation – RAM size & CORES number

- June 26, 2019 at 3:11 pm
  
  StacyLab
  Subscriber
  
  Hi!
  
  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
  
  2^nd Hard Drive: 2.5” 1T SATA SSD
  
  3^rd Hard Drive: 2.5” 1T SATA SSD
  
  *edited for clarity - apologize for confusion*

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