Hi, We did some tests with SLI as well, GeForce 285. We had a single screen and a way to expensive shader on a single quad. Just to be sure the CPU wasn't the bottleneck. Worked like a charm. Frame rate doubled when we enabled SLI under windows. We had to set the settings to alternate frame as the automatic settings just didn't do anything.
-- Nico On Fri, Nov 20, 2009 at 10:13 PM, Jan Ciger <[email protected]> wrote: > "Roman Grigoriev" <[email protected]> wrote: > > Hi,Robert > > Thanx for you reply. But you see I'm sure that under windows it's not > > possible to render on two Geforce cards and nvidia guys told me that I > > need to buy Quadro. My app works fine and do some render but only one > GPU > > calculate graphics. And in SLI mode you have only one virtual GPU > visible > > to OS. And that's why I decide to move on linux. Today only CUDA can > work > > on two Geforce under windows, and nvidia cuts some functionality in > > Geforce cards. When I run my code on linux I haven't got any speedup of > > using two GPUs. And that's why I ask about this subject. > > Roman, you can set your system up in such way that each GPU is assigned one > X > screen (not Twinview where you have one large desktop stretched over the > cards). Then OSG will use two graphic contexts and render on both cards for > sure. > > On the other hand, I doubt that you will see much of a speedup compared to > a > single card. If you are rendering for an HMD and do not have some kind of > special, high-end high resolution one, you are most likely bound by the CPU > and not the GPUs. Usual HMDs that I have seen have resolutions from about > 320x240 (low end) up to about 1280x1024 (decent, expensive stuff like > Kaiser) - > the GPU you are mentioning should be able to cope with that easily. > > Regards, > > Jan > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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