Yes also for the reason of the better bandwidth I would prefer the new
990FX chipset
in combination with new bulldozer and not the 890FX one with Phenom
(although the best one) but
as I wrote before I did not find any 990FX MB which could offer X16/X16/X16
speed in triple GPU configuration :((
Best,
Marek
Dne Wed, 30 Nov 2011 23:31:00 +0100 Ross Walker <ross.rosswalker.co.uk>
napsal/-a:
>> Don't make this mistake. One of my machines is AMD based (ASUS
>> CROSSHAIR IV + Phenom II X6 1090T.4.0Ghz, Suse 11.4) and the results
>> with two GTX580 3GB and maximum overclock are (NPT):
> ^^^^^^^^^^^^^^^^^
> :'( -------------------------|
>
>> JAC: 51.18 ns/day ( just 46.7 not overclocked), i.e. the scale is not
>> good the CPU is..
>
> We are working on addressing this for the AMBER 12 release but it will
> need CUDA 4.1 and peer to peer support. I need to check with NVIDIA to
> find out if it will ultimately be supported by the GeForce cards.
>
>> The same tests on my second machine (Intel 2600K.4.6 and Asrok Z68
>> Extreme7 Gen3) :
>> JAC: 56.36 ns/day
>
> I suspect this can be related to the front side bus speed and hence
> memory bandwidth differences between the two machines. What is the CPU
> memory bandwidth like for these two machines? It shouldn't have any real
> effect on single GPU performance but for parallel GPU performance the
> CPU memory bandwidth is critical. This is why 2 nodes by 1 GPU per node
> is faster than 1 node by 2 GPUs per node. Since the CPU memory bandwidth
> per GPU is better in the first case even when taking into account the IB
> interconn
> All the best
> Ross
>
> /\
> \/
> |\oss Walker
>
> ---------------------------------------------------------
> | Assistant Research Professor |
> | San Diego Supercomputer Center |
> | Adjunct Assistant Professor |
> | Dept. of Chemistry and Biochemistry |
> | University of California San Diego |
> | NVIDIA Fellow |
> | http://www.rosswalker.co.uk | http://www.wmd-lab.org/ |
> | Tel: +1 858 822 0854 | EMail:- ross.rosswalker.co.uk |
> ---------------------------------------------------------
>
> Note: Electronic Mail is not secure, has no guarantee of delivery, may
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Received on Wed Nov 30 2011 - 15:30:03 PST
