You don't need anything bigger as a matter of fact I'm running that exact PSU for 4x Titan X, and before them it was pushing 4x Titans. Nothing more is needed. 1200W is cutting it a bit too close but 1500 is perfectly enough.
On Thu, Aug 6, 2015 at 1:31 PM, 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 > > > >
