[Beowulf] General thoughts on Xeon 56xx versus E5 series?
orion at cora.nwra.com
Fri Sep 14 08:04:47 PDT 2012
On 09/14/2012 08:54 AM, Vincent Diepeveen wrote:
> 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
Clock Speed 2 GHz 2.5 GHz 3.3 GHz
Max Turbo Frequency 2.8 GHz 3 GHz 3.5 GHz
# of Memory Channels 4 4 4
Max Memory Bandwidth 51.2 GB/s 42.6 GB/s 51.2 GB/s
> 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.
>>> 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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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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