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#1 |
New Member
Abhishek
Join Date: Dec 2018
Posts: 6
Rep Power: 7 ![]() |
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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#2 |
Senior Member
Join Date: May 2012
Posts: 551
Rep Power: 16 ![]() |
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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#3 |
New Member
Abhishek
Join Date: Dec 2018
Posts: 6
Rep Power: 7 ![]() |
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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#4 |
Senior Member
Join Date: May 2012
Posts: 551
Rep Power: 16 ![]() |
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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#5 |
New Member
Abhishek
Join Date: Dec 2018
Posts: 6
Rep Power: 7 ![]() |
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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#6 |
Senior Member
Join Date: May 2012
Posts: 551
Rep Power: 16 ![]() |
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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#7 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,426
Rep Power: 49 ![]() ![]() |
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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Tags |
ansys, cfd, fluent, intel, processor |
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