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Workstation for ~€7-800 - 5820k based setup still best bet? |
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January 30, 2020, 17:40 |
Workstation for ~€7-800 - 5820k based setup still best bet?
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#1 | |
New Member
Rasmus Jørgensen
Join Date: Feb 2019
Location: Denmark
Posts: 7
Rep Power: 7 |
Hello,
I am considering putting together a budget workstation build as my time using my supervisors 2xE5-2637 V4 setup will soon expire. So, my cases are most commonly <5M cells, transient, single/multiphase flows in OpenFOAM. No reactions etc. At a budget of around ~€7-800 is the setup proposed below by flotus1 still my best bet? Quote:
It seems that a dual E5-2xxx V2/V3 setup is out of reach at this budget and perhaps it is not even optimal for my type of cases. If I have overlooked better alternatives, please fell free to inform me. Thanks in advance! - Rasmus |
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January 31, 2020, 09:00 |
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#2 |
Member
Jógvan
Join Date: Feb 2014
Posts: 31
Rep Power: 12 |
Hi Rasmus,
For your reference, I bought the following used PC in Denmark 3 years ago for 1350 EUR (10000DKK): i7-5820K Asus RAMPAGE V EXTREME X99 - 2011-v3 32GB Corsair VENGEANCE LPX red Samsung 950 PRO NVMe M.2 512GB GTX 1080 Founders Edition Corsair AX760i Corsair Graphite 760T Custom water cooling (EKWB) on the CPU & GPU Windows 10 home I would guess that for 700EUR-800EUR, you would get a similar PC. If you find something with a worse graphics card, then you can get a 6800k instead, for example, https://www.dba.dk/selvbyg-overclock...id-1063022322/. If you have an easy to run OpenFOAM setup, then can perform a test for you if needed. |
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January 31, 2020, 12:11 |
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#3 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,400
Rep Power: 47 |
It depends...
If your workflow mostly consists of pre- and post-processing, and solver times are less critical, X99 is still a valid option. Especially since DDR4 memory is still cheap. If you want to reduce the solver times for these transient simulations as much as possible, then dual-socket 2011 is the better choice. It is entirely possible to get a get a dual-socket 2011 system up and running for 800€. You can either search for decommissioned workstations from that era, or search for a good deal on a used motherboard. There is even another option: the cheap "dual X79" motherboards you can find on sites like aliexpress. Make sure to get one with 4 DIMM slots per CPU, and be prepared for long shipping times. Even dual-socket 2011-v3 might be possible with 800$ thanks to cheap motherboards from that site, depending on how much time you want to spend searching for good prices for CPUs and memory. |
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January 31, 2020, 15:13 |
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#4 |
New Member
Rasmus Jørgensen
Join Date: Feb 2019
Location: Denmark
Posts: 7
Rep Power: 7 |
@Jeggi: Thank you so much for your reply and thank you for offering to run a sample case. Also nice to find a fellow Dane here! I will remember your offer on running a test case
@flotus1: I was hoping to get a reply from you on this topic. I am definitely more biased towards reducing transient solver time as it will not be performing heavy pre-/postprocessing tasks. These E5's typically have lower clock frequencies than top range i7s. Is that not a significant disadvantage? And regarding GPUs, how cheap a unit can I get away with? Would something cheaper than a 2 GB GTX 750 Ti cripple my overall setup too much? |
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January 31, 2020, 15:48 |
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#5 | ||
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,400
Rep Power: 47 |
Quote:
The solver phase on the other hand benefits from more cores, as long as memory bandwidth can keep up. Any single CPU for the X99 platform will be slower than dual-socket 2011(-v3), because scaling stops at around 6 cores, due to memory bandwidth limit. No matter how high you crank up frequencies. Quote:
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February 1, 2020, 02:32 |
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#6 |
New Member
Rasmus Jørgensen
Join Date: Feb 2019
Location: Denmark
Posts: 7
Rep Power: 7 |
Thank you for your feedback, flotus1. I feel well informed to go part hunting on eBay now
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