[Beowulf] Shanghai vs Barcelona, Shanghai vs Nehalem

Mikhail Kuzminsky 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 
>>w/Barcelona will 
>> 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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