CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Hardware

OpenFOAM - Buying a new PC

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   August 1, 2013, 10:51
Default OpenFOAM - Buying a new PC
  #1
New Member
 
Join Date: May 2013
Posts: 6
Rep Power: 4
falstaff is on a distinguished road
Hello Foamers,

I am writing this today as I need a little help in deciding what computer to buy.
I am relatively new to OF and I would like to use it for the following applications:
- importing cad drawings and subsequent meshing of offshore platforms
- Ventilation studies
- Gas dispersion
- Fire modelling

From experience it seems that the number of cells required lies between 2 and 5 millions.

I am not a computer expert by any stretch of the imagination so would like your feedback based on two possible options. Let it be told that I cannot build a machine by myself and my budget is around the £2,000.00 mark.

Option 1)
http://configure.us.dell.com/dellsto...en&s=bsd&cs=04

Option 2)
http://www.meshcomputers.com/Default...omepage_dtbox2

I would greatly appreciate your feedback on these options and any tweaks required to make the most of my simulations.

Thank you for your time

Falstaff
falstaff is offline   Reply With Quote

Old   August 2, 2013, 06:03
Default
  #2
New Member
 
Join Date: Jul 2013
Posts: 8
Rep Power: 3
natem is on a distinguished road
Maybe it's just me, but I cannot read your links...

In general I found the following threads quite useful:
Which hardwares for workstation are more important to do CFD analysis?
Yet another workstation configuration question
Advice on the technical requirements for a new Fluent Workstation
What Hardware for CFX

I know: OF is neither CFX nor Fluent. If you're aware differences you can still learn from the respective discussions on hardware, though.

Cheers
Nate
natem is offline   Reply With Quote

Old   August 2, 2013, 08:35
Default
  #3
New Member
 
Join Date: May 2013
Posts: 6
Rep Power: 4
falstaff is on a distinguished road
Thanks for the reply and the link which I will read right now.
Sorry about the links, something went wrong. These are the right ones

1) dell
http://configure.us.dell.com/dellsto...en&s=bsd&cs=04

2) meshcomputer.co.uk
http://www.meshcomputers.com/Default...omepage_dtbox2

Thanks


regards
Falstaff
falstaff is offline   Reply With Quote

Old   August 5, 2013, 03:17
Default
  #4
New Member
 
Join Date: Jul 2013
Posts: 8
Rep Power: 3
natem is on a distinguished road
Just a couple of comments with regards to the two systems. Be warned that I'm not an expert on this myself (see my recent post in this section of the forum), so this is just based on what I've read and learned in my own research for a new system...

If you're on a restricted budget (and I feel 2k is quite restricted), my general guess is that you will get better value opting for an i7 core rather than for one of the Xeons (good performance, but over-priced). Furthermore you will definitely save if you use "normal" DDR3 RAM rather than ECC (which Dell uses for all its workstations, it seems).
On this basis, it seems to me that the second system would be the better bargain. Having said that, the i7 you selected has only two memory channels.- It might be advantageous using a 2nd generation i7 with four of them. (Remark: It is unclear to me how much exactly OpenFOAM is affected by this bottle neck - see other threads in this issue.)
If you can afford to spend a little more, try getting a six-core processor rather than four cores, from my experience and with the range of mesh sizes you'll be using this will boost OF computation time a lot. You might also try an use faster memory (2133 MHz instead of 1600), but I am not sure if this is actually of use if the processor doesn't support this (actually I've asked exactly this question in my other post - so just keep it in mind).

Sorry I couldn't be more helpful, I hope someone else who is more experienced will help out as well.

Regards
Nate
natem is offline   Reply With Quote

Old   August 5, 2013, 04:16
Default
  #5
New Member
 
Join Date: May 2013
Posts: 6
Rep Power: 4
falstaff is on a distinguished road
Nate,

thanks pal. this is very useful stuff
I think I am going to go ahead with the following
- Intel® Core™ i7 3970X Six Core Extreme Processor (3.50GHz, 15M Cache)
- 32GB DDR3 2400Mhz (4x8GB ) Quad Channel Memory Kit

It comes with a 900W PSU, do you think I should upgrade it to 1.2kW?

Thanks

Regards
Falstaff
falstaff is offline   Reply With Quote

Old   August 5, 2013, 10:15
Default
  #6
New Member
 
Join Date: Jul 2013
Posts: 8
Rep Power: 3
natem is on a distinguished road
CPU sounds fine to me.
If you're really going for the 2400 MHz memory, make sure that your motherboard supports this, too! Again, I'd like to highlight one more time that I'm not sure how much use a fast memory is if Intel declares the CPU to be fit for 1600 MHz only (see http://ark.intel.com/de/products/70845). The system is obviously going to work, but to me it's unclear how much you actually gain (if anything). We'd need another user to comment on this here.
As for the PSU I cannot tell. If the system is pre-configured and comes with 900W, I'd think that's fine (and actually it's a hell lot of power, I would have expected something like 600W). However I've been told that quality of PSUs varies a lot and it's definitely worth investing in a good one which provides very stable voltage levels, otherwise you'll see hardware failures more often / earlier over time. I cannot give any advice on which PSUs are considered hiqh quality though.
Good luck!
natem is offline   Reply With Quote

Old   August 6, 2013, 07:30
Default
  #7
New Member
 
Join Date: Jul 2013
Posts: 8
Rep Power: 3
natem is on a distinguished road
Just wanted to make you aware of this thread (New workstation for different usage scenarios - CPU and RAM) where CapSizer explains that faster RAM is only useful if you overclock the memory clock. As far as I know this should be possible with the setup you have in mind. But if overclocking is a no-go to you, you can probably settle for the slower RAM.

Cheers
Nate
natem is offline   Reply With Quote

Old   August 6, 2013, 07:33
Default
  #8
New Member
 
Join Date: May 2013
Posts: 6
Rep Power: 4
falstaff is on a distinguished road
Nate,

thanks a lot once again. For info I have gone ahead with the following workstation:

950W High Efficiency G7 Extreme Modular Super Silent Power Supply

MSI X79A-GD45 Intel® LGA2011 Mainboard - CrossFireX™/SLI™ Support

Intel® Core™ i7 3970X Six Core Extreme Processor (3.50GHz, 15M Cache)

Corsair H80 High Performance CPU Liquid Cooler

32GB DDR3 2400Mhz (4x8GB ) Quad Channel Memory Kit

2GB NVIDIA GEFORCE GTX 680 - 1536 Cores,2 DVI,HDMI,DP - 3D Vision Ready
240GB SSD - Solid State Drive

3TB SATA III 6Gb/s, 7200rpm, 64MB Cache, 8ms Hard Drive
falstaff is offline   Reply With Quote

Reply

Tags
pc newbuild openfoam

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
OpenFOAM - Validation of Results Ahmed OpenFOAM Running, Solving & CFD 9 June 22, 2011 18:59
Critical errors during OpenFoam installation in OpenSuse 11.0 amscosta OpenFOAM 5 May 1, 2009 14:06
Problem installing OpenFOAM 1.5 installation on RHEL 4. vwsj84 OpenFOAM Installation 4 April 23, 2009 04:48
2009 OpenFOAM Summer School in Zagreb, Croatia hjasak OpenFOAM Announcements from Other Sources 0 March 27, 2009 13:08
Getting OpenFOAM to coexist with an existing JAVA VM nik777 OpenFOAM Installation 5 February 22, 2007 08:21


All times are GMT -4. The time now is 00:06.