[mft1997]

Hi folks,
I’m configuring a Lenovo workstation for ANSYS mechanical and cfd. Which CPU will perform better, i7 9700k or i9 9900non-k. I don’t plan to overclock. Both are 8 cores, same all core turbo frequency at 4.6ghz, i9 has hyperthread, the i7 doesn’t.
i7 has 3.6ghz base frequency, i9 has 3.1ghz. Not sure if this will make any difference.
i7 is 95W TDP, i9 is 65W TDP, If they all run at full load, will the non-k version runs cooler than the k version? Price isn’t a big factor here.
I’m not sure if hyperthread will make ansys run better or worse or no difference, I’v seen different people give different opinions. If I get the i9, do I need to disable the hyperthread?

Thanks

[flotus1]

With the 9900, you will probably end up disabling Hyperthreading anyway. So the more cost-efficient of these two options is the 9700k.
And yes, without overclocking, which you probably can't do anyway on such an OEM system, a 65W TDP CPU from Intel will run cooler than a 95W SKU of the same generation. Note that I don't see a benefit in "running cooler" itself.
As a heads-up: Intel has already released the "10th" generation of their mainstream CPUs, with lower prices. So you will be paying more for older hardware.
Heads-up number two: these mainstream CPUs are not the best choice for CFD and FEA. Intels CPUs for socket 2066 outperform them thanks to quad-channel memory, and the hardware itself does not cost much more. Markups for OEM systems will of course make them more expensive.