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[Jonathan Aquilina]

this is quite an interesting read. it talks about the entry level i5 and
compares them to the i7s. granted its comparing the 2 you will learn alot
about the i7s as well.

http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/22151-intel-lynnfield-core-i5-750-core-i7-870-processor-review.html

2009/10/13 Dmitry Zaletnev <dzaletnev at yandex.ru>

>
> Hi,
> may be somebody will find interesting this CFD perfomance tests for
> different desktop i7/memory configs:
>
> http://techreport.com/articles.x/15967/4
>
> Sincerely,
> Dmitry
>
> > > On Behalf Of Dmitry Zaletnev
> > >
> > > I just thinking about a 2-nodes Beowulf for a CFD application that
> > > reads/writes small amounts of data in random areas of RAM (non-cached
> > > translation). What would be the difference in overall performance (I
> > > suppose, due to the memory access time) between Q9650/ 8 GB DDR2-800
> > > and i7 920/ 6 GB DDR3-1866.
> > you probably mean "DDR3-1066".
> > Concerning overall CFD performance, I would go for the i7 920.
> > For CFD performance data, one good resource are the FLUENT benchmark
> pages:
> > http://www.fluent.com/software/fluent/fl6bench/fl6bench_6.4.x/index.htm
> > click on one of the 6 test datasets there and get tables of benchmark
> performance. For example the Aricraft_2m model (with at:
> >
> http://www.fluent.com/software/fluent/fl6bench/fl6bench_6.4.x/problems/aircraft_2m.htm
> > The Nehalem (same architecture as i7 920) generation:
> > INTEL WHITEBOX (INTEL_X5570_NHM4,2930,RHEL5)*
> > FLUENT rating at 8 cores: = 784.9
> > The Harpertown generation (same architecture as Q9650, I think)
> > INTEL WHITEBOX (INTEL_X5482_HTN4,3200,RHEL5)
> > FLUENT rating at 8 cores: = 307.6
> > * To help decode these brief descriptions of processors, systems &
> interconnects, you can often find more details at this page:
> http://www.fluent.com/software/fluent/fl6bench/new.htm
> > THe FLUENT rating is a "bigger is better" metric relating to the number
> of jobs you can run in 24 hours, IIRC.
> > So with the newer generation, on these FLUENT benchmarks anyway, you get
> approximately 2x the performance.
> > > By the way, are local variables of
> > > methods/functions stored in L2 cache?
> > There are 3 levels of cache in the i7, 2 levels in the Q9650.
> > All your problems are likely to use all levels of cache. You are right
> that data you tend to reuse frequently will tend to live in the lower cache
> levels longer, but there are no hard and fast rules.
> > Bets of luck,
> > Tom
> > > The code will use all the system
> > > memory for data storage, excluding used by OS, no swapping supposed.
> > > I'm going to buy motherboards next month.
> > >
> > > Thank you in advance for any advice,
> > > --
> > > Dmitry Zaletnev
> > > _______________________________________________
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>
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-- 
Jonathan Aquilina
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