[BackBone]

Hello everyone. It is my 1st post on this forum. I hope im making the right questions.

Im trying to build a computer with the help of my teacher and the intended use is Flow-3D (Cast). I'm still a beginner when it comes to CFD so if someone could point me in the right direction or correct me i would be extremely thankful!

After reading a lot of threads and researching quite a while i've come to these conclusions:

1) Using GPUs to compute isn't worth it, for CFD.
2) Memory bandwidth and cache, per CPU, is the most important.
3) Faster CPU cores is always good.
4) Hyperthreading is bad.

So i've ended up on this build:

http://pcpartpicker.com/p/NjpxmG

So the questions are:

Is it good to have all 8 DIMM slots populated?
Is 32GB DDR4 enough for a six core CPU?
Will a 2133MHz ram overclock to higher clocks?
And lastly, should i consider a Xeon CPU?

Im trying to keep the build as cheap as possible, while still having a good quality!

Note: The Kingston RAMs in that build are there because a shop is making a very good deal on them (60 euro discount per kit).
Note2: The build doesn't include GPU, but i was thinking on the Quadro K2200, what do you think?

Thank you so much and i hope u can help me with this.

João Mira

[BackBone]

How would the i7-5820k fare against a xeon e5-1650 v3?
They have the same cache, cores, memory bandwidth (as seen in intel ark). Only diference is ECC Support and a bit more expensive.

[HyperNova]

Hi,
Xeon cpus can work non-stop 7-24,they are designed to do that, because of that they are a bit expensive, another thing is that you can install 2 or 4 of them in a single mainboard.
good luck

[BackBone]

Originally Posted by HyperNova

Hi,
Xeon cpus can work non-stop 7-24,they are designed to do that, because of that they are a bit expensive, another thing is that you can install 2 or 4 of them in a single mainboard.
good luck

Thank you for ur reply. Yes i know Xeons are basically done for multi CPU motherboard/application. But since i want a single CPU solution, is the build in the 1st post good? Can u give feedback if i should change anything for better performance with Flow-3D?

[HyperNova]

actually i can not open the link,
but in my opinion 5820k is very good with high memory bandwidth which is very essential in CFD ( it is about 68 Gig/sec) , of course 8*4Gig is better than 4*8Gig as i read in some threads, but the GPU you choose i think it is suitable for rendering or graphic works like photoshop or 3Dmax, as flow3d can not use GPU in simulating it is better not to spend money on that, i think a nvidia GTX 750 or 750Ti is enough, if you are planning to play games go for a higher ones like GTX 960 or 980,for ram go for a higher clock rams like 2400 or 2666 or even 3000, you can also overclock them but i think overclocking rams is rare! and also a bit dangerous.if you have enough budget go for a liquid CPU cooler because of their higher efficiency.The TDP of 5820k is 140watt so i think the stock fan may not be enough as you want to use all cores for hours nonstop.working on lower degrees increase the cpu life.
good luck

[flotus1]

For your scope of application the I7-5820k is the right choice. It can run 24/7 just as any Xeon processor, provided proper cooling.
And it can be overclocked which justifies the expensive water cooler.
Note that Xeon processors with numbers 1xxx are only intended for single-processor setups anyway.
You picked some of the most expensive DDR4-2133 RAM. It might even be incompatible with most cpu coolers because of the large heatsink attached to it.
Start with 4 8GB modules instead, then you can still upgrade it later if 32 GB are not sufficient. Try to get 2400MHz or even 2666MHz modules, they are still quite cheap.

[BackBone]

Originally Posted by HyperNova

actually i can not open the link,
but in my opinion 5820k is very good with high memory bandwidth which is very essential in CFD ( it is about 68 Gig/sec) , of course 8*4Gig is better than 4*8Gig as i read in some threads, but the GPU you choose i think it is suitable for rendering or graphic works like photoshop or 3Dmax, as flow3d can not use GPU in simulating it is better not to spend money on that, i think a nvidia GTX 750 or 750Ti is enough, if you are planning to play games go for a higher ones like GTX 960 or 980,for ram go for a higher clock rams like 2400 or 2666 or even 3000, you can also overclock them but i think overclocking rams is rare! and also a bit dangerous.if you have enough budget go for a liquid CPU cooler because of their higher efficiency.The TDP of 5820k is 140watt so i think the stock fan may not be enough as you want to use all cores for hours nonstop.working on lower degrees increase the cpu life.
good luck

This link http://pcpartpicker.com/p/NjpxmG doesn't work for you?
I have a corsair H100i on that build. The computer, besides flow 3d will also be used for CAD/CAM (like autocad, solidworks, powershape, powermill, catia, creo). Taking in account what you said i will probably go for the Quadro K620.
As for RAM, i follow ur advise. Thank you so much!

Originally Posted by flotus1

For your scope of application the I7-5820k is the right choice. It can run 24/7 just as any Xeon processor, provided proper cooling.
And it can be overclocked which justifies the expensive water cooler.
Note that Xeon processors with numbers 1xxx are only intended for single-processor setups anyway.
You picked some of the most expensive DDR4-2133 RAM. It might even be incompatible with most cpu coolers because of the large heatsink attached to it.
Start with 4 8GB modules instead, then you can still upgrade it later if 32 GB are not sufficient. Try to get 2400MHz or even 2666MHz modules, they are still quite cheap.

That ram was chosen because there is a store selling them for 170 euros only (normal price is 270). But if indeed its better to go for higher frequency i will follow the advice! Thank you

Note: I've tried looking online for the Cooler/high profile ram conflict but it seems that Corsair H100i is small enough not to get into contact with any RAM.

[BackBone]

This is the finished build. Budget ~1700 euros.

http://pcpartpicker.com/p/hrkvFT

Thank you for all your feedback!

João

[evcelica]

I don't know if this is still the case, as it was with DDR3 ram, but usually you should try to get a matched set of RAM. Meaning not two separate 4x4GB kits, but a 8x4GB kit instead. You shouldn't mix RAM kits, even ones from the same manufacturer and model. Especially when overclocking them.
There is a good chance it will work fine, but it is safer to get a single kit.
The XMP profiles may be different on the two 4x4GB kits, than on a 4x8GB kit, as their power requirements can be different.