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October 19, 2014, 01:24 |
Trying to pick system
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#1 |
New Member
Join Date: Mar 2010
Posts: 10
Rep Power: 16 |
So I'm looking to run optimization for several different sized fans. I've already done a few individual runs using Fluent RKE at about 8 millions cells (24GB RAM using double precision). Using a single core (5 year old Xeon) it takes about 2-3 days for a single run. I would like to build a machine which can get this down to about 8 hours.
I've got a budget of up to $5000, but that might be overkill and would prefer to stay under. I've put together a system, feedback would be appreciated. Because I'll be using multi-core I'll be ditching Fluent for something like OpenFOAM so I don't have to worry about the added cost of Fluent. CPU: Intel Xeon E5-2650 v3 Haswell 2.3GHz Link MoBo: SUPERMICRO MBD-X10DRI Dual 2011 R3 Link RAM: Thinking of something like this Also a few questions: 1) The latest generation of RAM (DDR4) has a high Cas latency (15 ms) and that makes me think I should just go with a slightly older 2011 v2 board with DDR3 ram. Is the lower latency better or is the newer DDR4 worth it? 2) I initially want to start with 32GB of RAM, should I go for 2 sticks of 16GB or 8 sticks of 4GB? Is there a method for maximizing the QPI's transfer rate? Thanks. |
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October 20, 2014, 04:21 |
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#2 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,396
Rep Power: 46 |
The CAS latency has the unit of cycles, not seconds.
So DDR4 2133 MHz with a CL of 15 has about the same latency as DDR3 1866 MHz with a CL of 13. But dont worry too much about latencies, for CFD applications you will want to maximize memory bandwith instead. Which brings us to your second question: The Xeon V3 CPUs all have four memory channels, so using only 2 DIMMs per processor will effectively halve the performance you get. Use at least four DIMMs per processor, so at least 8 in total if you want to use 2 processors. The processor you picked seems like a good choice, it is the cheapest that officially supports 2133 MHz DDR4 |
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