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i9-9900k for Ansys cfd.

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Old   January 2, 2019, 11:55
Default i9-9900k for Ansys cfd.
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I am building a new desktop, mainly for Ansys fluent and some mechanical. My mesh sizes vary between 1mil to 6mil. For my budget I was thinking to buy the new i9-9900k. How well does this CPU perform CFD simulations? Any other CPU recommendations in my price range would be appreciated.
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Old   January 2, 2019, 12:58
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In my country the 9900k is extremely overpriced (approx. 570 Euro). That is approximately the same as the much faster 7820X!



9700k should give the same performance @ 440 Euro (unlikely that the extra L3 cache will yield a significant performance difference).


9600k would also give very similar performance @ 300 Euro and is probably a much better option than the 8700k @ 420 Euro.



As a comparison - My old 7600k yield similar results as the 8700k when I use slightly higher memory clock speeds.


For pre-processing such as meshing, then the 9900k is probably be the best CPU you can get right now.
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Old   January 2, 2019, 13:23
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Thanks for the reply. Are you sure the 7820x is faster than 9900k? From the benchmarks I saw online 9900k is slightly faster. I might be wrong.
Also what about the AMD ryzen threadripper series? Especially the 1920x or the 2920x.
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Old   January 2, 2019, 13:35
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The 7820X will be much faster if you use all 8 cores, the 9900k will most likely hit the memory bottleneck when running on more than 4 of the 8 cores.


Threadrippers can be used, but they normally have less room for overclocking. Check the benchmark thread for some comparisons between Threadrippers and 7820X.
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Old   January 2, 2019, 13:42
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Thanks! Sorry but could you please explain memory bottleneck in 9900k. I didnt quite understand it. Are you referring to the RAM?
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Old   January 2, 2019, 13:52
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Yes. The 9900k has 2 memory channels. The 7820X has 4 memory channels.



Note that this has nothing to do with the amount of RAM installed, but rather how the CPU can communicate with the memory. The memory bandwidth is a measure of the width of the memory bus as well as the memory speed and the number of memory channels.
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Old   January 5, 2019, 13:45
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Quote:
Originally Posted by Simbelmynė View Post
Note that this has nothing to do with the amount of RAM installed
I know what you meant, but just to make sure OP makes the right choice: A CPU with 4 memory channels needs 4 physical DIMMs populated in order to leverage the quad-channel memory interface. E.g. 4x8GB or 4x16GB in the correct slots. The motherboard manual holds information about which slots are the right ones.
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