<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Brecht,<br><br>Thanks for your answers. <br><br><div><div><br>On 16.11.2011, at 14:53, Brecht Van Lommel wrote:<br><br><blockquote type="cite">Hi,<br><br>I guess this can almost turn into a GPU FAQ :)<br></blockquote><div><br></div><div>lol</div><br><blockquote type="cite"><br>2011/11/16 Sebastian Röthlisberger <<a href="mailto:lalli@gmx.net">lalli@gmx.net</a>>:<br><blockquote type="cite">Cycles GPU Rendering currently is limited by the amount of available memory on the GPU, as far as i know.<br></blockquote><blockquote type="cite">1.-will cycles be able to render scenes bigger than the available Memory on (one) GPU?<br></blockquote><blockquote type="cite"> 1b.-if, in future, cycles uses multiple GPUs will it be still limited by the max amount of memory on one GPU or by the sum of all?<br></blockquote><br>Rendering scenes bigger than available memory is planned to be added,<br>but it may be a year or so before I look at that. Multiple GPU's will<br>be limited by the max amount memory of 1 GPU.<br><br></blockquote><div><br></div><div>"will be limited by the max amount memory of 1 GPU" until the "bigger scene than memory" feature is added?</div><div><br></div><br><blockquote type="cite"><blockquote type="cite">2.-Is the rendering speed mainly determined by GFLOPS?<br></blockquote><blockquote type="cite"> 2b.-if not, can you tell me what is?<br></blockquote><br>There is no single GPU feature that correlates directly to rendering<br>performance, only way to know is to test.<br><br></blockquote><div><br></div><div>about 2. GFLOPS.<br><span class="Apple-tab-span" style="white-space:pre"> </span>afaik GFLOPS is not a single feature but (<a href="http://de.wikipedia.org/wiki/Floating_Point_Operations_Per_Second">wiki</a>) Floating Point Operations Per Second.<br></div><div><br></div><br><blockquote type="cite"><blockquote type="cite">3.-Does Cycles make use of any "newer" NVIDIA technology? I mean will an older GPU (cycles ready) with same specs as a theoretical new One render at about the same speed?<br></blockquote><br>It doesn't use any specific new functionality, but it benefits from<br>improved architecture of newer fermi cards.<br><br><blockquote type="cite">4.-Cycles doesn't care about Nvidia SLI, "just" (will) use all GPUs, right?<br></blockquote><br>SLI should probably be disabled to make multi GPU work even, not sure.<br><br><blockquote type="cite">5.-Will cycles care about different GPUs (for example 1xOlder Cuda, 2xNew Cuda)<br></blockquote><blockquote type="cite">6.-Will/might it be possible to mix Cuda and OpenCL GPUs?<br></blockquote><br>Probably using the same GPU's is more reliable, since you get the same<br>memory limits and GPU capabilities. If you've got an older GPU, use<br>that for drawing and the others for compute.<br><br><blockquote type="cite">7.-Is there a chance that, in future, currently older GPUs like gtx 295 will drop out of Cycles support?<br></blockquote><br>It's possible that some features will not be supported on them.<br><br><blockquote type="cite">8-. just for private use: Do you recommend any GPU?<br></blockquote><br>NVidia GTX 460, 560 and up, with as much memory as possible.<br><br><blockquote type="cite">Just wondering:<br></blockquote><blockquote type="cite">9.-I know you can't tell, but when you think will multiple GPUs be supported (CUDA)?<br></blockquote><br>In the next few months.<br></blockquote><div><br></div><div>That sounds great</div><br><blockquote type="cite"><br><blockquote type="cite">10.-Do you know/predict anything about significant speed differences (of cycles) between CUDA and OpenCL?<br></blockquote><br>There might be, we'll have to see how far we can get. In principle the<br>languages are similar and the hardware the same, but in practice it's<br>impossible to predict how it will turn out.<br><br><blockquote type="cite">11.- Between 0-100%, approximate about where is cycles development at the moment.<br></blockquote><br>There is no 100%, it's like asking when Blender will be done. Just try<br>it and see if it supports what you need.<br><br></blockquote><div><br></div><div>Yeah i know,there's never 100%. I was just wondering about what you "feel". I used cycles a lot and it is already very usable.</div><br><blockquote type="cite">Brecht.<br></blockquote><div><br></div><div>Thank you so much.</div><br><blockquote type="cite">_______________________________________________<br>Bf-cycles mailing list<br><a href="mailto:Bf-cycles@blender.org">Bf-cycles@blender.org</a><br>http://lists.blender.org/mailman/listinfo/bf-cycles<br></blockquote><br></div></div></body></html>