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 Content of type "text/html" skipped
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