On Sep 13, 2012, at 11:11 AM, Vincent Diepeveen wrote: > > e5 has 4 memory channels serving 8 cores. So that's 2 cores @ 4 > threads for each memory channel, just like 56xx.
I see on ark.intel the number of memory channels and number of cores of course largely depend upon which type of e5 you buy, they really released a lot of them. Not surprisingly they have a lot with 6 cores released as well, yet to my surprise i also see they have 8 core cpu's with 3 memory channels. Using 3 memory channels to serve 8 cores @ 16 threads under full load, it's not very optimal let me tell you that. Even a chessprogram already feels that difference. Yet the reason is pretty obvious, some of the E5's use the older socket 1356 versus 2011 for the higher numbered E5's. The new 2011 socket requires for 4 channels and multiples of 4 dimms. Lately Intel has both in consumer market as well as in server/HPC market a LOT of different types of cpu's. _______________________________________________ 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
