AMD Ryzen Threadripper PRO 5945WX

dasith0001 · November 30, 2023, 02:25

Hi,

Need your help to decide the best combination for my condition of simulations.

More often than not, I want to run multiple CFD models ( say 3-4 models) with 8 cores allocated for each.

I am looking at AMD Ryzen Threadripper PRO 5945WX, but which to choose ?
1. 24 core
2. 32 core
3. 64 core

to go with 1,2 or 3rd option what would be the ideal RAM set up
1.2x16GB
2.4x8 GB
3.4x16 GB

I am thinking 32 core with 4x8 GB of RAM. would this be the optimal ? would the bandwith be a problem when I am running multiple models ?
please advice

flotus1 · November 30, 2023, 06:00

For this generation of Threadripper Pro CPUs, only the 32-core and 64-core variants make sense for CFD.
The lower-end variants technically still boast an octa-channel memory interface. But due to the low amount of active CCDs, bandwidth to the I/O chiplet can not saturate the memory bandwidth.

Speaking of octa-channel memory: you also need 8 DIMMs for these CPUs. And an expensive WRX80 motherboard.
There is usually a more cost-efficient alternative with a regular Epyc CPU. Or two of them

Memory bandwidth has the same importance, no matter how many simulations you are running simultaneously.

dasith0001 · December 4, 2023, 01:07

Hi Alex,

Thank you for your inputs.

Cheers

November 30, 2023, 02:25	AMD Ryzen Threadripper PRO 5945WX	#1
dasith0001 Senior Member Desh Join Date: Mar 2021 Location: Sydney Posts: 118 Rep Power: 5	Hi, Need your help to decide the best combination for my condition of simulations. More often than not, I want to run multiple CFD models ( say 3-4 models) with 8 cores allocated for each. I am looking at AMD Ryzen Threadripper PRO 5945WX, but which to choose ? 1. 24 core 2. 32 core 3. 64 core to go with 1,2 or 3rd option what would be the ideal RAM set up 1.2x16GB 2.4x8 GB 3.4x16 GB I am thinking 32 core with 4x8 GB of RAM. would this be the optimal ? would the bandwith be a problem when I am running multiple models ? please advice

November 30, 2023, 06:00		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	For this generation of Threadripper Pro CPUs, only the 32-core and 64-core variants make sense for CFD. The lower-end variants technically still boast an octa-channel memory interface. But due to the low amount of active CCDs, bandwidth to the I/O chiplet can not saturate the memory bandwidth. Speaking of octa-channel memory: you also need 8 DIMMs for these CPUs. And an expensive WRX80 motherboard. There is usually a more cost-efficient alternative with a regular Epyc CPU. Or two of them Memory bandwidth has the same importance, no matter how many simulations you are running simultaneously. CFDfan and dasith0001 like this.

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December 4, 2023, 01:07		#3
dasith0001 Senior Member Desh Join Date: Mar 2021 Location: Sydney Posts: 118 Rep Power: 5	Hi Alex, Thank you for your inputs. Cheers