[Cinek_Poland]

Hi. I would like to know what is performance or efficiency each of three processors
Amd Threadripper 2920x
Threadripper 1920x
Ryzen 5800x

Is the performance difference between 2920x and 1920x large? Which would be more efficienty ?
I read that 2920x core can work using turbo mode (4,3 Ghz).

[Simbelmynë]

1. I assume you are talking about CFD simulations.
2. By efficiency I assume you just mean "the fastest CPU" and not performance per watt.


2920X and 1920X are quite similar although memory compatibility for the 1920X is much worse.


With high frequency, low latency, dual rank memory modules you can get amazing multi-threaded results with the 5800X, close to the 1920X. It will be the fastest - by far - when it comes to single-threaded simulations and also probably for pre/post.


I would probably go with a 9800X or 10900X if you can stretch your budget a bit, or even better - a used dual 2678v3 workstation (which will give you way more performance for the money).

[CFDfan]

Originally Posted by Simbelmynë

a used dual 2678v3 workstation (which will give you way more performance for the money).

There are these AMD threadripper CPUs with say 32/64 or 64/128 cores. I wander if a single CPU like these could over-perform a dual CPUs with the same number of cores
in CFD tasks (provided the RAM is the same, DDR4, and the max amount of RAM is not a limitation). This is more of a question if a single CPU can compete with a dual CPUs with the same total # of cores in solving CFD tasks. I know about the more memory lines in the dual version, but the single CPUs usually have higher speed and support higher speed RAM as well. I just wander if somebody has has practical experience about this and is willing to share it.

[Simbelmynë]

Originally Posted by CFDfan

There are these AMD threadripper CPUs with say 32/64 or 64/128 cores. I wander if a single CPU like these could over-perform a dual CPUs with the same number of cores
in CFD tasks (provided the RAM is the same, DDR4, and the max amount of RAM is not a limitation). This is more of a question if a single CPU can compete with a dual CPUs with the same total # of cores in solving CFD tasks. I know about the more memory lines in the dual version, but the single CPUs usually have higher speed and support higher speed RAM as well. I just wander if somebody has has practical experience about this and is willing to share it.

You have the practical experience in the large benchmarking thread.


So the short answer is; if your workloads behave as typical CFD workloads then you are better off with more memory channels in almost all cases, as is evident by the nice performance of older setups with dual CPU.



If you are on a tight budget and also wish to use your computer for single threaded tasks then current generation desktop CPUs may be a good option. Alder Lake may also be interesting in a month or so.