Along these lines - which 980ti would you guys recommend? I found this an EVGA GeForce GTX 980 Ti Hybrid which has built-in watercooling and a separate fan to mount in the back of the cabinet - pretty cool.
http://www.proshop.dk/Grafikkort/EVGA-GeForce-GTX-980-Ti-Hybrid-6GB-2493470.html (danish site) Morten Den 6. august 2015 kl. 11:16 skrev Tim Leydecker <[email protected]>: > hitting the sweetspot between price and performance? > > How about connectors and power supply? > > The 970 is running on 2x6pin, e.g. a maximum of 150 Watts plus the 75 Watts > from the slot, a 225 Watts total. > > The 980ti is mostly 1x6pin and 1x8pin, the 1x8pin offering 150Watts > compared to a 1x6pin offering 75 Watts. > > In my case, I find it already hard to provide more than one 1x8pin and > 1x6pin via connectors. > How do you guys provide reliable power to more than 1 or 2 graphics cards > without melting your power lines? > > Here in Germany, it is rare to have more than around 1 kW sustained drain > per average wall plug supported by a great many home installations. > There is always loads of headroom of course but technically, constantly > draining a lot more from such a wall plug can get, uhmmm, hot. > > That´s a few of the reasons I suggested to start out with just 1 card, like > a Titan X (or a GTX980ti), case power supply connection, wall plugs, > electrical limits. > > Cheers, > > tim > > > > > > > > Am 05.08.2015 um 16:10 schrieb Mirko Jankovic: > > agree. 980ti is just a bit above 2 970s price wise, performance wise it > > realyl dpends on scenes you are working on. but I plan to upgrade my 4x970 > > with 980ti as soon as possible, even if it means replacing 1 by 1 > > > > On Wed, Aug 5, 2015 at 3:36 PM, Matt Morris < [email protected] > > <mailto:[email protected]> > wrote: > > > The 970 is the most cost efficient only with scenes that fit into its > > > memory - which using redshift is limited to 3.5Gb because of the internal > > > memory architecture. I'd recommend looking at gpus with 6Gb or higher. The > > > 980ti is a great card for the money, and the extra vram will help > > > performance even on small scenes as you can utilise memory optimisation > > > settings. Because you're limited to 4 gpus (risers don't work too well and > > > limited by number and speed of pci-e lanes as mirko said) you want to make > > > the most of that space. Per card electricity usage and heat output isn't > > > that much more for the 980ti. > > > > > > On 5 August 2015 at 14:04, Tim Leydecker < [email protected] > > > <mailto:[email protected]> > wrote: > > > > Thanks for the clarification, Dan. > > > > > > > > I think I mixed this up with the download section of the forum for > > > > customers? > > > > > > > > Whatever, good that the registered user forum is accessible to > > > > interested > > > > parties. > > > > > > > > Cheers, > > > > > > > > tim > > > > > > > > P.S: For Hair, Shave&Haircut is supported (I don´t have personal > > > > experience > > > > with it). > > > > > > > > > > > > Am 05.08.2015 um 14:17 schrieb Dan Yargici: > > > > > " you may find it helpful to register in the Redshift3D.com forums, > > > > > afaik > > > > > you´ll need to have > > > > > at least one registered license to get access to the "Registered users > > > > > only" forum area." > > > > > > > > > > Just to clear this up. I'm pretty sure you don't need to have a > > > > > license to > > > > > access the Registered Users section of the Redshift forums. > > > > > > > > > > DAN > > > > > > > > > > > > > > > On Wed, Aug 5, 2015 at 2:58 PM, Rob Chapman < [email protected] > > > > > <mailto:[email protected]> > wrote: > > > > > > A lot of good and informed points by all, just wanted to add, this > > > > > > guy > > > > > > here, Sven, at http://www.render4you.de/renderfarm.html > > > > > > <http://www.render4you.de/renderfarm.html> recently became the first > > > > > > official Redshift GPU render farm and have used him already on a few > > > > > > jobs > > > > > > with very tight deadlines. Essentially he has a rack of 7x Tesla > > > > > > K40st - > > > > > > so 1 node is the equivalent of a 6x single 980gtx which I find is > > > > > > pretty > > > > > > cost effective solution of adding a decent online GPU render node, > > > > > > that > > > > > > works with hardly any setup if you have a redshift scene ready to go > > > > > > > > > > > > best > > > > > > > > > > > > Rob > > > > > > > > > > > > On 5 August 2015 at 11:56, Tim Leydecker < [email protected] > > > > > > <mailto:[email protected]> > wrote: > > > > > > > Hi Morten, > > > > > > > > > > > > > > you may find it helpful to register in the Redshift3D.com forums, > > > > > > > afaik > > > > > > > you´ll need to have > > > > > > > at least one registered license to get access to the "Registered > > > > > > > users > > > > > > > only" forum area. > > > > > > > > > > > > > > There´s a few threads there about Hardware, multiple GPU systems > > > > > > > and some > > > > > > > user cases > > > > > > > of testing single gpu vs. multi gpu rendering plus some Developer > > > > > > > info > > > > > > > about roadmaps and such. > > > > > > > > > > > > > > Personally, I´m a big fan of Redshift 3D. > > > > > > > > > > > > > > Still, here´s a few things to consider you may find useful: > > > > > > > > > > > > > > - Compared to Arnold, there is no HtoA or C4DtoA equivalent, e.g. > > > > > > > no direct > > > > > > > C4D or Houdini support > > > > > > > - Compared to Arnold, rendering Yeti is not yet supported in > > > > > > > Redshift3D - > > > > > > > it´s looked at, no ETA. > > > > > > > - Maya Fluids, Volumerendering, FumeFX e.g. Fire&Smoke&Dust&such > > > > > > > isn´t in > > > > > > > Redshift3D sofar > > > > > > > > > > > > > > - Multitasking, compared to CPU based multitasking and task > > > > > > > switching (e.g. > > > > > > > switching between > > > > > > > rendering in Maya, Softimage while simultaneously comping in > > > > > > > Nuke and > > > > > > > painting Textures in Photoshop > > > > > > > or Mari) may pose GPU specific limitations with multiple > > > > > > > applications > > > > > > > fighting for a very limited GPU VRAM. > > > > > > > Redshift3D can utilize system RAM for VRAM but there can be > > > > > > > headache when > > > > > > > other, "dumber" apps go ahead > > > > > > > and just block VRAM for their caching. It´s well worth running a > > > > > > > good few > > > > > > > hard tests in typical workflow scenarios. > > > > > > > Maya, Substance Painter/Designer, Nuke, Photoshop, they all offer > > > > > > > one type > > > > > > > or another of GPU caching or GPU > > > > > > > acceleration option. My personal feeling is, such stuff never > > > > > > > gets tested > > > > > > > in real-world, multiple-applications-running scenarios. > > > > > > > > > > > > > > At a glance, it would sound easy enough to have separate, > > > > > > > dedicated GPUs > > > > > > > run headless for rendering and reserving one GPU > > > > > > > for viewport display and other apps but to be honest, all this > > > > > > > stuff is so > > > > > > > new, even thought it´s great, it´s still pushing grown > > > > > > > legacy workflows and boundaries and in doing so, it may sometimes > > > > > > > hurt. > > > > > > > > > > > > > > My very personal suggestion is: > > > > > > > > > > > > > > - a starter kit is just one GPU, optimally a Titan X with 12GB > > > > > > > VRAM. > > > > > > > - step 2, adding a second GPU, running headless, reserved for > > > > > > > rendering > > > > > > > - step 3, adding a third GPU, comparing speed to step 2 > > > > > > > - step 4, price/performance balancing, comparing a 1-2-3 GPU > > > > > > > GTX970 render > > > > > > > rig with the above > > > > > > > > > > > > > > Could be you find out you like to run 1 Titan X for viewport > > > > > > > display and > > > > > > > multi-apps, and 2 GTX970 for a render job. > > > > > > > > > > > > > > > > > > > > > Another thing. > > > > > > > > > > > > > > Multi-socket CPU boards and PCIe slots. It seems easier to get > > > > > > > solid single > > > > > > > socket CPU boards with lot´s of PCIe slots. > > > > > > > > > > > > > > Again, from my personal experience running a current generation > > > > > > > dual socket > > > > > > > Xeon rig, it is annoying how many CPU > > > > > > > cycles I see wasted away in idle in most of my daily chores, > > > > > > > except for > > > > > > > pure rendering with Arnold or the likes, I find > > > > > > > myself mostly having one CPU and even most of the other CPU´s > > > > > > > cores just > > > > > > > not used properly by software. > > > > > > > > > > > > > > I think a good sweetspot would have been to just go for one fast, > > > > > > > solid > > > > > > > 6-core(budget) or 8core (current) CPU, unless of course for a > > > > > > > dedicated > > > > > > > render slave... > > > > > > > > > > > > > > > > > > > > > Cheers, > > > > > > > > > > > > > > tim > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Am 05.08.2015 um 12:05 schrieb Morten Bartholdy: > > > > > > > > I know several of you are using Redshift extensively or only > > > > > > > > now. We are > > > > > > > > looking in to expanding our permanent render license pool and > > > > > > > > are > > > > > > > > considering the pros and cons of Arnold, Vray and Redshift. I > > > > > > > > believe > > > > > > > > Redshift will provide the most bang for the buck, but at a cost > > > > > > > > of some > > > > > > > > production functionality we are used to with Arnold and Vray. > > > > > > > > Also, it will > > > > > > > > likely require an initial investment in new hardware as Redshift > > > > > > > > will not > > > > > > > > run on our Pizzabox render units, so that cost has to be counted > > > > > > > > in as > > > > > > > > well. > > > > > > > > > > > > > > > > It looks like the most priceefficient Redshift setup would be to > > > > > > > > make a few > > > > > > > > machines with as many GPUs in them as physically possible, but > > > > > > > > how have you > > > > > > > > guys set up your Redshift renderfarms? > > > > > > > > > > > > > > > > I am thinking a large cabinet with a huge PSU, lots of cooling, > > > > > > > > as much > > > > > > > > memory as possible on the motherboard and perhaps 8 GPUs in > > > > > > > > each. GTX 970 > > > > > > > > is probably the most power per pricepoint while Titans would > > > > > > > > make sense if > > > > > > > > more memory for rendering is required. > > > > > > > > > > > > > > > > Any thoughts and pointers will be much appreciated. > > > > > > > > > > > > > > > > > > > > > > > > Morten > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > www.matinai.com <http://www.matinai.com>
