[mespinil]

Hi everyone,

I have a budget of 2k€ to make a general-purpose computer mainly for FEM and CFD. It is kind of annoying to have programs I need at work I cannot practice with at home because I have a mid tier 4 years old laptop, but it is not meant for super continuous or heavy use.

This is my first iteration:

CPU: AMD Ryzen 9 7900X3D 4.4GHz/5.6GHz (579€)
RAM: Corsair Vengeance DDR5 5600MHz 64GB 2x32GB CL40 (184€)
Motherboard: Gigabyte B650 GAMING X AX (224€)
SSD: Samsung 970 EVO Plus 1TB SSD NVMe M.2 (49€)
Cooler: Noctua NH-D15S chromax.black (110€)
PSU: Gigabyte UD850GM PG5 850W 80 Plus Gold Full Modular (104€)
GPU: MSI GeForce RTX 3060 VENTUS 2X OC LHR 12GB GDDR6 (300€)

For a grand total of 1870€ after Windows installation and delivery.

Many questions and any help related to component price, compatibility or reputability is appreciated (first ever build). The one main concern I have though:

Based on this thread, right now 12 cores with 64 GB is wasting cores. My intention is to substitute this 2x32 GB RAM for 2x64 GB which should be in the ballpark of an efficient system. I could not find anything about 2x64GB being impossible in terms of architecture but neither about them being released anytime soon or ever. It is not a priority for me to get 128 GB, I can wait for them to get released and cheap.

Any opinion on whether this is a good idea at all?

[wkernkamp]

Originally Posted by mespinil

Hi everyone,


....


Based on this thread, right now 12 cores with 64 GB is wasting cores. My intention is to substitute this 2x32 GB RAM for 2x64 GB which should be in the ballpark of an efficient system. I could not find anything about 2x64GB being impossible in terms of architecture but neither about them being released anytime soon or ever. It is not a priority for me to get 128 GB, I can wait for them to get released and cheap.

Any opinion on whether this is a good idea at all?

The limiting factor for your cores is the bandwidth, not the capacity. How much Memory do the problems that you want to run use on your work computers? Easy to check and should answer your question whether 64 GB is sufficient or not.

[CFDfan]

Originally Posted by mespinil

Hi everyone,

CPU: AMD Ryzen 9 7900X3D 4.4GHz/5.6GHz (579€)

Any opinion on whether this is a good idea at all?

The CPU is only a dual memory bandwidth. Knowing that the memory bandwidth is the bottleneck of the CFD solver I don't know if a dual channel CPU would be a good choice