[gmx-users] Re: GPU-based workstation

[Szilárd Páll]

On Tue, May 28, 2013 at 10:14 AM, James Starlight
<jmsstarlight at gmail.com> wrote:
> I've found GTX Titat with 6gb of RAM and 384 bit. The price of such card is
> equal to the price of the latest TESLA cards.

Nope!

Titan: $1000
Tesla K10: $2750
Tesla K20(c): $3000

TITAN is cheaper than any Tesla and the fastest of all NVIDIA GPUs (in
most cases).

>  Could it give me better performance in gromacs ?

The GROMACS GPU kernels are ~40% faster than on a GTX 680 and ~25%
faster than a K20, but when it comes to total performance, the
differences will obviously be smaller.

> Also assuming that 1 such card need 600 WATT power supply what supply I
> need for desktop with two such cards?

Nope. The peak power consumption of a TITAN is 250W and in
compute-only applications I doubt it draws more than max 70-80% of
that. With GROMACS as the GPU is only busy at most 70-80% of the time,
the effective consumption will scale roughly with those numbers. You
should use one of the online PSU calculators.

>
> 2013/5/28 Ehud Schreiber <schreib at cgen.com>
>
>> I have nothing to contribute regarding the CPUs, but note that last week
>> Nvidia introduced the GTX 780 GPU (a "Titan lite"), and this week it is
>> expected to introduce the GTX 770 one (probably an "overclocked 680").
>> Therefore, disregarding possible price issues, it seems that the GTX 680
>> may not be the best option.
>>
>>
>>
>> >Date: Mon, 27 May 2013 14:14:51 +0400
>>
>> >From: James Starlight <jmsstarlight at gmail.com<mailto:
>> jmsstarlight at gmail.com>>
>>
>> >Subject: Re: Re: Re: [gmx-users] GPU-based workstation
>>
>> >To: Discussion list for GROMACS users <gmx-users at gromacs.org<mailto:
>> gmx-users at gromacs.org>>
>>
>> >Message-ID:
>>
>> >             <CAALQopymnZm5r+3q4LK_ncM=
>> vOts3fVuKBEKy4k3PK27N2xAfg at mail.gmail.com<mailto:CAALQopymnZm5r+3q4LK_ncM=
>> vOts3fVuKBEKy4k3PK27N2xAfg at mail.gmail.com>>
>>
>> >Content-Type: text/plain; charset=ISO-8859-1
>>
>> >
>>
>> >On Nvidia benchmarks I've found suggestions of using of the two 6 cores
>> CPU for systems with the 2 GPU.
>>
>> >
>>
>> >Assuming that I'll be using two 680 GTX cards with 256 bits and 4gb ram
>> (not a profesional nvidia cards like TESLA) what CPU's >could give me the
>> best performance- 1 i7 of 8 cores or 2 Xeons e5 with 6 cores ? Does it
>> meaningful to use 2 separate CPU's with >several nodes each for the 2 GPU's
>> ?
>>
>> >
>>
>> >James
>>
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