Purpose of use : Flow Simulation (AirFlow)
Is it OK to use 1800 x?
If for simulation it is better to have multiple core of high clock speed. But you know this is only if we talk for simulation no other factor included like other software, cost of hardware, work to be done and etc,
There haven't been a lot of studies done on this, but general consensus is that Flow Sim does not scale well to multiple threads. Better to spend your money on a newer CPU with high clock speed and plenty of high-quality RAM.
Single 4-core CPU should be fine.
Keep in mind, that is with an Nvidia GPU. Some reviews have shown that Ryzen performs better when paired with an AMD GPU. However, I don't recall any theories as to why.
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