Cpu
 

Hey I am a new member,but also a newbie and i would like to build a PC to do some light CFD simulations.
My CPU options would be the Ryzen 5 3600 and Ryzen 7 2700.
Which one would be better?

Out of these two choices: Ryzen 5 3600.
It is almost as fast as the Ryzen 2700 in compute-heavy multi core benchmarks. It is much faster single core. And most importantly for CFD: the memory controller is so much better, meaning you can choose whatever DIMMs you find for cheap, and still get decent memory frequency.

If you plane to use the stock cooler, maybe it is better to buy a 3600X version accompanying better CPU cooler.


https://static.techspot.com/articles...21-image-3.jpg

Thank you!!!

One more question how much does the graphics card matter should i look for a 4GB or 8GB?

It usually doesn't matter too much. At least for calculations.
For pre- and post-processing, which you will be doing most of the time when learning the software, you still want a semi-capable graphics card.
Used AMD RX 470 or 570 offer a pretty good value for money. 4GB of VRAM should be enough for an entry-level workstation.