[gmx-users] GPU and aux power supply

[Alex]

It is a 4-core CPU, single GPU box, so I doubt I will be running more
than one at a time. We will very likely get a different PSU, unless...
I do have a molex to 6 pin concerter sitting on this very desk. Do you
think it will satisfy the card? I just don't know how much a single
molex line delivers. If you feel this should work, off to installing
everything I go.

Thanks a bunch,
Alex

SP> First of all, unless you run multiple independent simulations on the same
SP> GPU, GROMACS runs alone will never get anywhere near the peak power
SP> consumption of the GPU.

SP> The good news is that NVIDIA has gained some sanity and stopped blocking
SP> GeForce GPU info in nvidia-smi - although only for newer cars, but it does
SP> work with the 960 if you use a 352.xx driver:
SP> +------------------------------------------------------+

SP> | NVIDIA-SMI 352.21     Driver Version: 352.21         |

SP> |-------------------------------+----------------------+----------------------+
SP> | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr.
SP> ECC |
SP> | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util Compute
SP> M. |
SP> |===============================+======================+======================|
SP> |   0  GeForce GTX 960     Off  | 0000:01:00.0      On |
SP>  N/A |
SP> |  8%   45C    P5    15W / 130W |   1168MiB /  2044MiB |     31%
SP>  Default |
SP> +-------------------------------+----------------------+----------------------+


SP> A single 6-pin can deliver 75W, an 8-pin 150W, so in your case, the hard
SP> limits of what your card can pull is 75W from the PCI-E slow + 150W from
SP> the cable = 225 W. With a single 6-pin cable you'll only get ~150W max.
SP> That can be OK if your card does not pull more power (e.g. the above
SP> non-overclocked card would be just fine), but as your card is overclocked,
SP> I'm not sure it won't peak above 150W.

SP> You can try to get a molex -> PCI-E power cable converter.


SP> --
SP> Szilárd

SP> On Mon, Jun 29, 2015 at 9:56 PM, Alex <nedomacho at gmail.com> wrote:

>> Hi all,
>>
>> I have a bit of a gromacs-unrelated question here, but I think this is a
>> better place to ask it than, say, a gaming forum. The Nvidia GTX 960 card
>> we got here came with an 8-pin AUX connector on the card side, which
>> interfaces _two_ 6-pin connectors to the PSU. It is a factory superclocked
>> card. My 525W PSU can only populate _one_ of those 6-pin connectors. The
>> EVGA website states that I need at least 400W PSU, while I have 525.
>>
>> At the same time, I have a dedicated high-power PCI-e slot, which on the
>> motherboard says "75W PCI-e". Do I need a different PSU to populate the AUX
>> power connector completely? Are these runs equivalent to drawing max power
>> during gaming?
>>
>> Thanks!
>>
>> Alex
>> --
>> Gromacs Users mailing list
>>
>> * Please search the archive at
>> http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before
>> posting!
>>
>> * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists
>>
>> * For (un)subscribe requests visit
>> https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or
>> send a mail to gmx-users-request at gromacs.org.
>>