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Date: Mon, 15 Jul 2013 11:59:13 +0530
From: Sayantan Datta <std2048@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: GPGPU SLI/CROSSFIRE

On Mon, Jul 15, 2013 at 8:27 AM, Jeremi Gosney <epixoip@...dshell.nl> wrote:

> On 7/14/2013 7:23 PM, Sayantan Datta wrote:
>
> Hi marcus,
>
> On Mon, Jul 15, 2013 at 3:24 AM, marcus.desto <marcus.desto@...pl> wrote:
>
>> does SLI / CROSSFIRE increase performance during GPGPU computations? Does
>> it have any advanges for GPGPU computations at all?
>
>
>
>  Of course it does, only you need to write programs that can do it.
>
>
>
> Actually this is not true, at least not for AMD. Crossfire needs to be
> disabled in order to use OpenCL.
>
> In the "old days" you had to explicitly disable Crossfire in order to run
> OpenCL apps. If Crossfire was enabled, the app would either 1. not run, 2.
> would run very slowly, or 3. would only run on one GPU. But I believe
> nowadays the driver just simply ignores any Crossfire configuration.


Oh, I thought crossfire is just a name given to identical multi-gpus in a
system.  I didn't recognize it as something related to software which you
can enable or disable.

Regards,
Sayantan

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