Depends on which card you end up going with. But even a 970 x 4 will draw 900 leaving you with 600 room for the rest. And that could be fine initially. But consider the fact that power supply ubits become less efficient over time and will start to output less wattage.
On Thu, Aug 6, 2015, 6:31 AM Morten Bartholdy <x...@colorshopvfx.dk> wrote: > Thanks guys for the very comprehensive walkthrough on this topic - this > list is still a goldmine! :) > > > > So for a 4 GPU workstation setup - would you suggest something like the > Corsair AX1500i or should it be bigger? > > > > > > Morten > > > > > Den 6. august 2015 kl. 12:49 skrev Matt Morris <matt...@gmail.com>: > > The conversation was aimed towards renderfarms rather than workstations > though, and I imagine running a render job per gpu rather than per node, so > that the scaling per gpu is much better (ie 100% minus maybe a small hit on > the cpu usage being shared). Could be run headless so no need for a display > card. > > In terms of power at the wall, in the uk a kettle will routinely use 3000w > (albeit only for a short time) so a 4 gpu pc should be within acceptable > limits - between 1000 - 1500 w when rendering. The biggest problem I've had > is finding a suitable UPS which is silent as most at that rating need fans, > and are designed to sit in a server room instead of a studio space. > > There was an interesting post on the RS forums recently from a guy setting > up a gpu renderfarm using these: > http://www.supermicro.com/products/system/2U/2028/SYS-2028GR-TRH.cfm > > dual xeon, 6 gpu solutions mmm. Sounds like quite a bit of work to get it > all working smoothly though, including modifying 980ti card power outlet > from top to back to match tesla cards. > > > On 6 August 2015 at 10:16, Tim Leydecker < bauero...@gmx.de > wrote: > > Would you guys find the 980Ti 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 < matt...@gmail.com > 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 < bauero...@gmx.de > 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 < tekano....@gmail.com > 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 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 < bauero...@gmx.de > 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 > > > > > -- > www.matinai.com > > > >
