[Beowulf] Shanghai vs Barcelona, Shanghai vs Nehalem
kus at free.net
Wed Oct 22 10:29:13 PDT 2008
In message from Mark Hahn <hahn at mcmaster.ca> (Wed, 22 Oct 2008
13:23:08 -0400 (EDT)):
>>> Are there some informal comparisons of Shanghai vs Nehalem?
>> I beleive that Shanghai performance increase in comparison
>> be practically defined only by possible higher Shanghai frequencies.
>is that based on anything hands-on?
No, I'm not under NDA - because I don't have Shanghai chips in hands
>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 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
>is firing on all cylinders, AMD needs to be the rotary engine or have
>cylinders, or something...
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