[Wien] 2 XEON 5355 or 4 XEON 5150?
shaposh at isp.nsc.ru
Mon Oct 22 11:23:33 CEST 2007
On Monday 22 October 2007 15:35, Florent Boucher wrote:
> Dear Wien users,
> In that case, if you look the benchmark results below, it is not a good
> solution !
> bi-Xeon 5320 (overcl 2.67GHz)
> You can see that even an overclocked solution run slower than an AMD
> when putting 8 jobs on it !
> The memory band width is much lower than on AMD, due to the memory
> architecture. It is better in that case to by more nodes with less
> expensive AMD chips for which the efficiency is much better when the
> load average is close to 100%.
I believe those are results i obtained for my machine :)
The scaling is very bad indeed, even though the machine has almost 20% faster
memory than standart non-overclocked bi-Xeon X5355 (and the same CPU
> For information, we have been able to buy a solution with 20 nodes from
> a well known company (1U, 2 x AMD 2.8GHz bicore, 8Go DDR2 per node,
> Infinipath DDR 4X, warranty 3 years) for less than 50k€ (without taxes).
> The power consumption for such a configuration will be less than 7kW/h.
You could have done better and pay less.
Typical 24-port infiniband switch is 5k€, 1 node based around Intel Q6600 with
8GB memory is 1k€ including infiniband mem-free network card, so 24k€ for 24
nodes, 30k€ total.
The cluster will have 920Gigaflops, and consume no more than 5KW.
And if you dare :) , you can always trouble-free overclock it to at least
3GHz, increasing to 1.15 Teraflops.
Scaling will be good enough, as the memory performance of Intel desktop
chipsets is adequate.
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