Hi! Thanks for the review link! Ildefonso. On Mon, Aug 30, 2010 at 6:01 PM, Greg Smith <greg@xxxxxxxxxxxxxxx> wrote: > Clemens Eisserer wrote: > > Hi, > > > > This isn't an older Opteron, its 6 core, 6MB L3 cache "Istanbul". Its not > the newer stuff either. > > > Everything before Magny Cours is now an older Opteron from my perspective. > > > The 6-cores are identical to Magny Cours (except that Magny Cours has > two of those beast in one package). > > > In some ways, but not in regards to memory issues. > http://www.anandtech.com/show/2978/amd-s-12-core-magny-cours-opteron-6174-vs-intel-s-6-core-xeon/2 > has a good intro. While the inside is like two 6-core models stuck > together, the external memory interface was completely reworked. > > Original report here involved Opteron 2427, correctly idenitified as being > from the 6-core "Istanbul" architecture. All Istanbul processors use DDR2 > and are quite slow at memory access compared to similar Intel Nehalem > systems. The "Magny-Cours" architecture is available in 8 and 12 core > variants, and the memory controller has been completely redesigned to take > advantage of many banks of DDR3 at the same time; it is far faster than two > of the older 6 cores working together. > > http://en.wikipedia.org/wiki/List_of_AMD_Opteron_microprocessors has a good > summary of the models; it's confusing. Quick chart showing the three > generations compared demonstrates what I just said above using the same > STREAM benchmarking that a few results have popped out here using already: > > http://www.anandtech.com/show/2978/amd-s-12-core-magny-cours-opteron-6174-vs-intel-s-6-core-xeon/5 > > Istanbul Opteron 2435 in this case, 21GB/s. The two Nehelam Intel Xeons, >>31GB/s. New Magny, 49MB/s. > > -- > Greg Smith 2ndQuadrant US Baltimore, MD > PostgreSQL Training, Services and Support > greg@xxxxxxxxxxxxxxx www.2ndQuadrant.us > -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
