[Beowulf] Shanghai vs Barcelona, Shanghai vs Nehalem

Bruno Coutinho coutinho at dcc.ufmg.br
Wed Oct 22 10:43:02 PDT 2008

2008/10/22 Mark Hahn <hahn at mcmaster.ca>

> Are there some informal comparisons of Shanghai vs Nehalem?
>> I beleive that Shanghai performance increase in comparison w/Barcelona
>> will be practically defined only by possible higher Shanghai frequencies.
> is that based on anything hands-on?
> IMO, AMD needs to get a bit more serious about competing.  if I7
> ships with ~15 GB/s per socket and working multi-socket scalability,
> it's hard to imagine why anyone would bother to look at AMD.  either:
>        - there is some sort of significant flaw with I7 (runs like a
>        dog in 64b mode or Hf turns into blue cheese after a year, etc).
>        - AMD gets its act together (lower-latency L3, highly efficient
>        ddr3/1333 interface, directory-based coherence).

AMD could MCM 2 shanghai chips, resulting in 6 cores (2 tri-cores) or 8
cores (2 quad cores) and "quad channel" memory interface.
But nothing prevents Intel doing it too.

>        - AMD satisfies itself with bottom-feeding (which probably
>        also means only low-end consumer stuff with little HPC interest).
> I've had good reason to be an AMD fan in recent-ish years, but if Intel
> is firing on all cylinders, AMD needs to be the rotary engine or have more
> cylinders, or something...
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