[gmx-users] GPU and aux power supply

[Szilárd Páll]

What I meant is this: http://goo.gl/8o1B5P

That is 2x molex -> 8pin PCI-E. A single molex may not be enouhg.

--
Szilárd

On Tue, Jun 30, 2015 at 7:10 PM, Alex <nedomacho at gmail.com> wrote:

> 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
> >> --
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