Date: Sun, 14 Jul 2013 19:57:29 -0700 From: Jeremi Gosney <epixoip@...dshell.nl> To: john-dev@...ts.openwall.com Subject: Re: GPGPU SLI/CROSSFIRE 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 > <mailto: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. See the AMD APP FAQ : "ATI CrossFire technology allows multiple AMD GPUs to work together on a single graphics-rendering tasks. This does not apply to AMD APP computational tasks because it is not compatible with the compute model used for AMD APP applications." "It is recommended that ATI CrossFire be turned off in most system configurations so that AMD APP applications can access all available GPUs in the system." : http://developer.amd.com/wordpress/media/2012/10/AMD_APP_SDK_FAQ.pdf Content of type "text/html" skipped
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