[fini]

Hi everyone,
I need a computer for ANSYS mechanical.

I have two choices:

Intel 11900K + 64GB RAM (3200MHz - CL16 DDR4)
or
Intel 13700K + 64GB RAM (5200MHz - CL36 DDR5)

Which one is the better choice?

[flotus1]

Doesn't seem like too tough of a choice, the latter is certainly faster.
If it is memory latency you are worried about, let me put that into perspective:

CL16 mean a CAS latency of 16 clock cycles. With DDR4-3200 (i.e. 1600MHz), that results in 10 ns.
For DDR5-5200 CL36, the latency is 13.8 ns. Certainly sill slower, but more than compensated by the higher bandwidth and overall newer CPU architecture.

And of course you could (in my opinion: should) go faster. DDR5-6400 CL32 kits are available in 2x32GB, and not even crazy expensive. E.g. https://geizhals.eu/corsair-vengeanc...loc=de&hloc=pl

[fini]

Originally Posted by flotus1

Doesn't seem like too tough of a choice, the latter is certainly faster.
If it is memory latency you are worried about, let me put that into perspective:

CL16 mean a CAS latency of 16 clock cycles. With DDR4-3200 (i.e. 1600MHz), that results in 10 ns.
For DDR5-5200 CL36, the latency is 13.8 ns. Certainly sill slower, but more than compensated by the higher bandwidth and overall newer CPU architecture.

And of course you could (in my opinion: should) go faster. DDR5-6400 CL32 kits are available in 2x32GB, and not even crazy expensive. E.g. https://geizhals.eu/corsair-vengeanc...loc=de&hloc=pl

Thank you, dear Alex, your answer was so helpful.

[Crowdion]

Originally Posted by fini

Hi everyone,
I need a computer for ANSYS mechanical.

I have two choices:

Intel 11900K + 64GB RAM (3200MHz - CL16 DDR4)
or
Intel 13700K + 64GB RAM (5200MHz - CL36 DDR5)

Which one is the better choice?

Floating point performance of the i7-13700k is twice that of the i9-11900k

i9-11900k: Floating Point Math 53,340 MOps/Sec
vs
i7-13700k: Floating Point Math 116,466 MOps/Sec


Comsol benchmark: 11900k vs 13700k


Source: https://www.techpowerup.com/review/i...13700k/10.html


Therefore, without any doubt, 13700k is a more preferable option.