[gmx-users] 4 x Opteron 12-core or 4 x Xeon 8-core ?

[David McGiven]

Dear Carsten,

Thanks for the advice!

The thing is that considering the price differences, we could buy 2-3  
AMD machines (48 core) for each 1 Intel machine (32) core.

I'm only curious about how much faster Intel will be. Side to side,  
amd 48core vs intel 32core, would make us talk about 2x differences in  
ns/day?

Thanks again.

Regards,
David

>
> Message: 1
> Date: Thu, 20 Jan 2011 13:45:54 +0100
> From: Carsten Kutzner <ckutzne at gwdg.de>
> Subject: Re: [gmx-users] 4 x Opteron 12-core or 4 x Xeon 8-core ?
> To: "Discussion list for GROMACS users" <gmx-users at gromacs.org>
> Message-ID: <DBA5ECBB-D1F3-4559-A849-FB8CF16C918F at gwdg.de>
> Content-Type: text/plain; charset=us-ascii
>
> Hi David,
>
> On Jan 20, 2011, at 1:21 PM, David McGiven wrote:
>
>> Dear Gromacs Users,
>>
>> We're going to buy a new server for HPC. It is going to run mainly  
>> Gromacs calculations.
>>
>> Regarding Gromacs performance, I'm wondering which one, you Gromacs  
>> users and developers, think will be faster.
>>
>> AMD Server :   4 x AMD Opteron 6176 12-core 2.3 Ghz + 96GB Memory  
>> (2GB / core)
>> Intel Server : 4 x Intel Xeon 8-core 2.66 Ghz + 64 GB RAM (2GB /  
>> core)
>>
>> We normally run ~100k atom systems with PME and explicit water.
>>
>> Which one would you recommend ?
>>
>> Also, of course, AMD Server is cheaper. But we are mainly  
>> interested on performance.
>
> If you have a fixed amount of money, you will get the most ns/day
> if you buy the AMD Magny Cours machines. Each one will be slower  
> compared to the
> Intel server but you will get more servers altogether, thus more total
> performance. If you can only buy a single server and you do not care  
> about
> what it costs, the Intel will be faster for shure.
> Note that you do not need 2 GB/core for 100k atoms MD systems if you  
> run
> Gromacs. Half of it will be more than enough.
>
> Carsten
>
>
>> Thanks.
>>
>> Best Regards,
>> David
>>
>>
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>
>
> --
> Dr. Carsten Kutzner
> Max Planck Institute for Biophysical Chemistry
> Theoretical and Computational Biophysics
> Am Fassberg 11, 37077 Goettingen, Germany
> Tel. +49-551-2012313, Fax: +49-551-2012302
> http://www.mpibpc.mpg.de/home/grubmueller/ihp/ckutzne
>
>