Yes, You can easily see this in the latency numbers of higher clocked processors. they're faster than lower clocked i7's of the same kind.
Let me email directly to you a test i wrote for that some years ago. On Sep 14, 2012, at 5:04 PM, Orion Poplawski wrote: > 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 >> available. >> > > Really? > > http://ark.intel.com/compare/64590,64591,64587 > > 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. >>>> 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 or...@nwra.com >>> Boulder, CO 80301 http://www.nwra.com >>> _______________________________________________ >>> Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin >>> Computing >>> To change your subscription (digest mode or unsubscribe) visit >>> http://www.beowulf.org/mailman/listinfo/beowulf > > > -- > Orion Poplawski > Technical Manager 303-415-9701 x222 > NWRA, Boulder Office FAX: 303-415-9702 > 3380 Mitchell Lane or...@nwra.com > Boulder, CO 80301 http://www.nwra.com _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
