[Pw_forum] IS DUAL CORE 2.7 GHz, 2GB RAM SUFFICIENT FOR QE calculations??

[siddheshwar chopra]

Dear Lorenzo,
yes what you suggested is correct. Only one point I need to clarify here.
The power consumption per R-Pi board is 4 watts. Regarding network switch,
yes we need one. But overall what you said is right. It is better to buy a
desktop than building R-Pi cluster.
I am planning for a refurbished or used one IBM server with Intel Xeon
either quad core or 2 quad cores and 8 GB RAM. How much HDD would be good?

Regards,


On Wed, Jul 23, 2014 at 1:38 PM, Lorenzo Paulatto <
lorenzo.paulatto at impmc.upmc.fr> wrote:

>
> On 07/23/2014 08:55 AM, siddheshwar chopra wrote:
> > Ashkan how about studying molecules with QE? As far as I read, we use
> > 1x1x1 k-point (Gamma) only for studying them. Please give your
> > comments on molecule study. Say I need to study magnetic, optical and
> > DOS of molecules. Then is my system sufficient?
>
> I would recommend to use the same money to buy a powerful desktop
> machine instead. The ARM1176 cpu used in the Raspberry Pi is not
> particularly suited for floating-point arithmetic (even if it does
> include hardware floating point). You also have to factor in the slow
> network hardware, and the maintenance nightmare that it would be to keep
> such a cluster running.
>
> Buying 10 RPi would cost ~ 230£, to which you have to add 10 USB power
> and micro usb cables and the network cables and some kind of network
> switch. I would say around 350£ for 20 extremely slow cores. With the
> same money you can probably grab special offer desktop from Dell with
> only 4 cores, but each 4 times faster.
>
> cheers
>
>
> --
> Dr. Lorenzo Paulatto
> IdR @ IMPMC -- CNRS & Université Paris 6
> +33 (0)1 44 275 084 / skype: paulatz
> http://www.impmc.upmc.fr/~paulatto/
> 23-24/4é16 Boîte courrier 115, 4 place Jussieu 75252 Paris Cédex 05
>
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-- 
*Dr. Siddheshwar chopra,*


*M.Sc., Ph.D (Physics)Assistant Professor (Physics),*
*Amity University, Noida, India.*
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