Hi Filip and all,
regarding overclocking I have good
eperience with special editions of GPUs
which are overclocked already in factory
and so usually they have also improved cooling
system (e.g. they are bigger than GPUs from the basic edition
having bigger cooler). Concrete types which I am using
are:
EVGA GeForce GTX680 Classified (4GB)
GIGABYTE N680OC-4GD (4GB)
MSI N580GTX Lightning Xtreme Edition ( 3GB )
I owe here some EVGA GeForce GTX680 Classified benchmarks,
I will post them in few days here just to have
comparison between basic and in factory OC GPU regarding Amber jobs.
In case of some bigger overclocking of the basic edition GPU
I would be careful here in case of long term GPU calculation jobs unless
you have really perfect and reliable cooling (e.g. liquid), but
I have no experiences here so it is just my opinion.
Perhaps also in case of TITAN some in factory OC versions will be
released.
BTW speaking about the new top HW technologies, how is the
story about the Amber + Intel Xeon Phi Coprocessor ( the "GPU killer" :))
).
(
http://www.intel.com/content/www/us/en/processors/xeon/xeon-phi-detail.html
)
Best wishes,
Marek
Dne Tue, 19 Feb 2013 20:59:39 +0100 filip fratev <filipfratev.yahoo.com>
napsal/-a:
> Hi Ross, Scott and all,
>
> Yes.., this card looks to be awesome! I am really
> glad that all our predictions agree! I know that the DP is not so
> important in
> Amber now, but this is just an interesting fact:)
> If someone is able to get the card soon, please
> post some benchmark results here. I will try to get some of them asap
> too:)
> Ross and Scott, when you have time please
> comment this:
> I know that you're against any GPU's overclock,
> but with the current technology and in particular Titan we will have in
> fact
> two choices. First, if someone prefers to work in 1/3 DP mode he will be
> restricted to 837MHzby
> GPU itself, but if someone decides to use the 1/24 DP the card will
> automatically
> work at the boost speed level of 876Mhz. Moreover, the boost speed can
> be defined to be more than 900+Mhz. Thus
> we have different speeds using same card. Do you think that this wills
> affects
> much the calculations (not speed :) )?
> All the best,
> Filip
>
> ________________________________
> From: Scott Le Grand <varelse2005.gmail.com>
> To: AMBER Mailing List <amber.ambermd.org>
> Sent: Tuesday, February 19, 2013 9:08 PM
> Subject: Re: [AMBER] GTX Titan was finally released
> GTX 680 is ~75 ns/day (though my 32-bit linux system has seen 77 now and
> then)...
>
> I expect 115-120 for GTX Titan...
>
> GTX690 is your throughput bargain while the Titan is just frickin'
> awesome...
>
>
>
> On Tue, Feb 19, 2013 at 9:58 AM, Ross Walker <ross.rosswalker.co.uk>
> wrote:
>
>> Hi Marek,
>>
>> You are comparing the 'wrong' thing. K20 / K20X are HPC cards, this
>> means
>> SLOWWWWWW (but green ;-) ). Thus you should really compare the K20X
>> performance with the M2090 which is the other HPC card. So there you
>> have:
>>
>> DHFR/NVE
>>
>> M2090 = 43.74 NS/day
>> K20X = 89.13 ns/day
>>
>>
>> So that's a more than doubling in performance which is pretty much in
>> line
>> with Moore's law.
>>
>> The GTX Titan you should compare against the GTX680 as they are both
>> gaming cards. And thus FASSSTTTT (and hot!). There you'll be looking at
>> 54.46ns/day and I expect about 115ns/day or so for the GTX Titan board
>> so
>> yeap pretty much Moore's law as well.
>>
>> So I am not sure what numbers you were looking at to say the performance
>> difference was not big. Perhaps you looked at the TRPCage numbers which
>> is
>> the first plot on the page and GB? That won't tell you much since it is
>> only 304 atoms! There you are pretty much at the parallel limit so it
>> doesn't benefit from the extra cores in the new cards. I might move the
>> implicit solvent benchmarks to the bottom of the page to avoid this
>> confusing people. For comparison you should really look at the explicit
>> solvent benchmarks on the amber page:
>>
>> http://ambermd.org/gpus/benchmarks.htm#Benchmarks
>>
>> With regards to your question about optimization for K20. There is
>> potential for about another 30% performance improvement or so but this
>> is
>> quote a bit of work and has to be balanced against adding more features.
>>
>> All the best
>> Ross
>>
>>
>> On 2/19/13 8:55 AM, "Marek Maly" <marek.maly.ujep.cz> wrote:
>>
>> >Hi Filip and all,
>> >
>> >I just obtained offer to test K20 here:
>> >
>> >http://www.nvidia.co.uk/object/k20-gpu-test-drive-uk.html
>> >
>> >so it forced me to check actual Amber benchmarks where K20/K20x
>> >results are already present so one may compare
>> >their performance e.g. to GTX680.
>> >
>> >http://ambermd.org/gpus/benchmarks.htm
>> >
>> >
>> >as anybody can see the increase of performance
>> >is not so overwhelming.
>> >
>> >So in this context I do not understand Filip's
>> >
>> >"much much faster" .
>> >
>> >much much faster THAN WHAT ???
>> >
>> >Perhaps not than K20/K20x if yes why ?
>> >
>> >Anyway I would be grateful for any comments regarding so small
>> >performance increase of the new architectures K20/K20x
>> >comparing to GTX608.
>> >
>> >I am not sure but if I remember well there was some
>> >opinions that the new Kepler will be about
>> >5x times faster (maybe not than GTX680 which is K104 based
>> >but than fermi based GTX580 which is also not true)
>> >
>> >Is there problem, that the Amber code is still not fully
>> >optimised for K20 and the actual patch 14 just allowed
>> >to use Amber on these new generation GPUs but it will
>> >need some more code improvements in order to use all
>> >the advantages of the new Kepler architecture ?
>> >
>> >
>> > Best wishes,
>> >
>> > Marek
>> >
>> >
>> >
>> >
>> >
>> >
>> >Dne Tue, 19 Feb 2013 17:40:12 +0100 filip fratev
>> <filipfratev.yahoo.com>
>> >napsal/-a:
>> >
>> >> Hi Ross and all,
>> >>
>> >> After a lot of rumors the GTX Titan card was
>> >> released today. For the first time on any consumer-level NVIDIA card,
>> >> double precision (FP64)
>> >> performance is uncapped. That means 1/3 FP32 performance, or
>> >> roughly 1.3TFLOPS theoretical FP64 performance. Thus this card is
>> very
>> >> similar
>> >> (same for Amber use) to Tesla K20x, but costs 1000$ and will be much
>> >>much
>> >> faster! I suppose that Titan will break the 100+ ns threshold on JAC
>> >> test with
>> >> Amber 12 and have no patience to see some test results!
>> >> All the best,
>> >> Filip
>> >> _______________________________________________
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>> >> AMBER.ambermd.org
>> >> http://lists.ambermd.org/mailman/listinfo/amber
>> >
>> >
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Received on Wed Feb 20 2013 - 06:00:04 PST
