[fonograph]

And what about 7640x? Sure its only 4 core,but it have 4 channel memory controller,wouldnt that be nice budget choice?

[pibil1]

It's 2 channel memory, am I right?

https://www.intel.com/content/www/us.../i5-7640x.html

[flotus1]

Exactly. Kaby Lake-X only has two memory channels despite sharing the same socket and motherboards with Skylake-X
Could we please agree that you were already given good price/performance choices. I would have mentioned if there were any better options than X99 (Socket 2011-3) in this regard.

[pibil1]

5820K in x99 would be the most budget I can think of

[fonograph]

So all Xeons have 6 channel memory,or only gold & platinum?

5820k cost 30 euro more in my country than 7800x,I might save on X99 motherboard,but with cheap X299 around,I dont see single benefit to 5820k except that it doesnt need deliding,but then its 22nm older gen,so there is practicaly zero benefit

[flotus1]

All right this is my last post here. I will try to make it as clear as I can one last time:
I7-5820k and I7-6800k are old CPUs. Buy them used to save money. Do not buy new, the retail prices are too high.
Socket 2011-3 (X99 chipset) motherboards are an old platform. Buy used to save money or buy new if you can get it for a good price, say <150€
I7-7800x is current gen, so are X299 motherboards. Buy new.

[fonograph]

Are the bronze and silver xeons 6 channel memory too?
Can someone give me link to some CFD benchmarks where the advantage of more memory channels is shown?

[Simbelmynë]

Intel is a good resource when it comes to their CPUs, e.g.

https://ark.intel.com/products/12354...Cache-1_70-GHz

When it comes to memory channels/bandwidth I think it is generally accepted that this is good in general for most CFD software. If you run single tread then it may be of less importance (1-3 threads per memory channel is a good rule of thumb according to posters in this forum).

[fonograph]

I finaly got the money,so my a absolute highest budget is 700 euro.I already have the case and nh d14 noctua cooler from my previous computer build,this is what I plan to buy.

I5 8400 = 186.70 e

Asrock Z370 Extreme4 = 147.80 e

Evga Supernova G3 550w = 81 e

Intel 545s SSD 256gb = 91 e

I have about 170e remaining and I want to spend it on some type of 2x8gb ddr4 memory,I want something with big overclocking potential ( for a cheap ram ).I can get the following :

Crucial Ballistix Sport 2400MHz CL16 BLS2C8G4D240FSB = 160.60 e

Crucial Ballistix Elite 2666Hz CL16 BLE2C8G4D26AFEA = 171 e

G.SKILL Gaming Series - Aegis 2400 MHz CL15 F4-2400C15D-16GIS = 162 e

Corsair Vengeance LPX 2133MHz CL13 CMK16GX4M2A2133C13R = 171.50 e

Kingston HyperX Fury 2133MHz CL14 HX421C14FB2/8 = 156 e

I read three times on internet that the Kingston can be easily overclocked to 3000MHz.I had previously owned Corsair Vengeance DDR3 1600MHz that had big OC potential,but I am not sure how good this DDR4 2133MHz one can go,I have no idea about the Crucial,note its the normal version,not the LT.

EDIT : Can I even overclock ram on non-k cpu? The motherboard is Z370 so that should not be problem,but non-k cpu have locked multiplier and I heard bclk can only go from 100 to 102.7 MHz and also that any increase in bclk disables integrated gpu.I will be using the integrated gpu so I dont know if ram oc is possible.

[fonograph]

I did research all day,I decided to change the intel 545s to 850 evo 250gb.I narrowed my memory to two options.

1. 2x8gb Kingston HyperX Fury 2133MHz for 155e

2. 2x8gb Crucial Ballistics Elite 3466MHz for 198e

The kingston seams like nice cheap ram,I read multiple reports of people overclocking it to 3000 MHz.I believe its Hynix A die.The Crucial on other hand is the famous Samsung B Die,I saw it overclocked to 4000 MHz.

But my dilema is this,if I buy the B die fast ram,the extra money over the kingston ram is like 10 euro away from going to 8600k,like I said earlier,I already have one of most powerfull aircoolers,the nh d14,but I dont want to delid to void warranty.

Normaly I would take faster cpu over faster ram any day but I heard CFD is bottlenecked by ram bandwidth,and 2x 4000 MHz ram is significantly more than 2x 3000 MHz.But then 8400 is 3.8 GHz all core turbo,and I am confident I could OC the 8600k atleast to 4.8 GHz,what should I choose?

But the overclocked 8600k will run significantly hotter and fan will run faster so it will also be louder,also I like to avoid overclocking cpu,dont want longevity,stability and warranty problems,overclocking the fast B die ram would give me extra performance without extra noise and problems with heat.

[ashokac7]

If if are not much bothered about single core performance you can go for AMD Ryzen Threadripper with 8 cores. No doubt Intel processors gives best single core performance like for gaming etc. But for FEA or CFD where multiple cores can actually be used in simulations, more cores on AMD will outperform Intel. If you go on to buy Intel 8 core processor (like Intel i9 series), there cost is twice that of AMD. So if you want to run simulation on parallel serveres (MPI) the AMD is more economical choice.

[flotus1]

It is not really twice as expensive. AMD TR 1900x (8 cores) costs around 500€ where I live. Intels I7-7820X (8 cores) cost around 530€. With the advantage of cheaper motherboards and better memory compatibility.
AMDs mainstream Ryzen 8-core CPUs don't count here, they compete against Intels mainstream CPUs in terms of performance.

[fonograph]

I decided to not buy Z370 + 8600k,instead I will wait for the new Ryzen 2000 series that will come out in April,I will buy 6 core and overclock it.

Biggest problem I see in my budget pc build is ram size,there is three unfortunate elemenets at play,CFD needs alot ram,I have very little money,ram prices are crazy high right now.

The only choice I have is 16gb new ram or 32gb used ram,I read that CFD workstations tend to have 128gb,and minimum recomended size is 64gb,how bad will it be with 16gb? Will 16gb workstation be completly useless?

Buying second hand stuff is risky and the models I have opportunity to buy are the slowest 2133 MHz Crucial 16gb sticks,also some HP ECC 16gb 2133 MHz sticks,on other hand,I can buy new 3466 MHz 2x8gb samsung B die kit,considering Ryzen benefits from fast ram due to Infinity fabric working at ram frequency,I am not sure what should I buy.