[yassermshok]

Hello guys

I need your advice on buying a new machine for running CFD simulations (Mainly using ANSYS Fluent and FDS).

I want to make a decision between buying a single processor machine with the following specs:

E5-2690 V3 (PassMark score 19002) (12 cores)
128 GB RAM (4 identical 32 GB RAM sticks)

Or the second option with the following specs:

Dual E5-2650 V3 (PassMark score 20291) (2x10 cores)
128 GB RAM (8 identical 16 GB RAM sticks)

From my experience I think that the second system will be much better because it will have more cores and more memory channels (8 instead of 4), but the PassMark scores indicates that the difference will not be much.

My question is: Are PassMark scores representative of the real life performance when running CFD simulations ?

[flotus1]

Are PassMark scores representative of the real life performance when running CFD simulations ?

Not at all. It is geared towards measuring maximum FPU throughput, and handles more than one NUMA node poorly.

The second system is the better choice for your requirements.

[clarc]

twice as fast had been strange. The system has more overhead when using two cpus, but for very heavy multiprocessing workloads more is better.






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