[Beowulf] General thoughts on Xeon 56xx versus E5 series?

Vincent Diepeveen diep at xs4all.nl
Fri Sep 14 07:54:04 PDT 2012


The memory controller is on die, so the bandwidth that the CPU itself  
delivers,
independant from the number of channels, is dependant upon the CPU  
frequency.

Higher frequency means more bandwidth simply with the given memory  
channels available.



On Sep 14, 2012, at 4:41 PM, Orion Poplawski wrote:

> On 09/14/2012 05:00 AM, Igor Kozin wrote:
>> if memory bandwidth is your concern then there are models which boost
>> it quite significantly. e.g.
>> http://ark.intel.com/products/64584/Intel-Xeon-Processor- 
>> E5-2660-20M-Cache-2_20-GHz-8_00-GTs-Intel-QPI
>> probably very few codes are going to benefit from AVX without extra
>> efforts but BW is a clear win.
>> i'm seeing a good speed up on some applications which can be
>> attributed to higher BW.
>
> There are 6.4, 7.2, and 8 GT/s chips
>
> This is an interesting puzzle and the mid tier price point:
>
> DUAL INTEL XEON 6C E5-2640 (2.5GHz/7.2GT/s/15MB) CPU  [+ $1,810.00]
> DUAL INTEL XEON 4C E5-2643 (3.3GHz/8GT/s/10MB) CPU  [+ $1,798.00]
> DUAL INTEL XEON 8C E5-2650 (2GHz/8GT/s/20MB) CPU  [+ $2,270.00]
>
> So for BW limited one would go with the second two, but you have a  
> big choice
> between low cores/cache high MHz and high cores/cache low MHz.
>
> -- 
> Orion Poplawski
> Technical Manager                     303-415-9701 x222
> NWRA, Boulder Office                  FAX: 303-415-9702
> 3380 Mitchell Lane                       orion at nwra.com
> Boulder, CO 80301                   http://www.nwra.com
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