You just have to realize that when you demand GPU compute tasks, you cannot expect fluid viewport performance at the same time. Thanks alot for all your thoughtful feedback. With up to three cards to choose for Maya 2013 + V-ray over 60+% of the time, and Adobe CC the rest, which config would be best? Would a K5000 viewport and Titan GPU outperform a single Quadro K6000? When Maya V-ray discussed everyone says GPU Titan but have yet to find mention of viewport card being used but am assuming they all have at least two GPUs? If you have a card like the K5000 or K6000, do you need a second card for Maya + Vray? With Maya by itself everything I read say K5000 best (did not see K6000 benchmarks). The slowest one won't be dragging the others - results will always be rendered faster, but burning extra watts etc through slow cards is not that productive. For the final image export, if your "viewport" card has enough VRam and meaningful GPGPU performance (for example K2000 while good viewports is nearly useless in GPGPU, and the K4000 is not that much better, being 2x of meaningless is not a feat), can always be added in the mix to help.Īgain, ANY mix of cards and performances can be used. If you want to use the RT engine as an activeshade window checking lighting and shaders from different angles etc, it is actually useful to have 2x or more cards: a dedicated viewport accelerating card that doesn't stumble each time you touch your middle mouse button, and one or more GPGPU cards that do just VRay RT acceleration. If say you need more than 1.5GB or RAM and you have a 1.5GB 580 and the 780, only the 780 will kick in - even if you select them both as active compute cards. adding a 780 to your current system will be working fine, with you having the option to render with either the 580 (actually the fastest single GPU GTX in VRay RT before the 780 and Titan) or the 780 or both simultaneously - given the scene "fits" in both's VRam individually.
On the "pro" side, you don't need to pair them with identical models as you do with SLI/CFX: i.e. Each one has half of the RAM "advertized" for individual and exclusive use, and if an application doesn't support SLI/CFX (like 3DS Max or Maya viewports as of 2014 versions for example), you are only using 1x GPU and half the ram. Just doesn't.Įach GPU needs to have all the assets available in its own VRam buffer to get started.ĭual GPU cards, like the GTX 690 or the Radeon 7990 are often advertized as "4GB" and "6GB" cards, but this is marketing bluntly lying: those are 2x individual GPUs on a single PCB SLI/Crossfired together, with one being the primary and the other being the secondary. Not for games either - doesn't matter if you SLI or not. Not for VRay RT, not for any other progressive rendering or GPGPU application. It is certain that VRAM in cards doesn't add up. I hope so since I will keep my 2x GTX 580 3gb for a while and make some sequences. It will be way faster on never cards like GTX 780, but GTX 580 might keep up okay. I think, and I'am pretty shure that Vray 3.0 will change these things quite drastically. No Vray RT, but hopefully it will compare pretty good with iRay or Octane. Tom's Hardware has very GPU renderengine benchmarks that is really good. 6gb memory on the GPU though is a very neat improvement. Unfortunately the speed improvement hasn't been that great two generations later (from GTX 580 to 780) when you render with physically accurate render engines. So my projects will be a little "easier" on that part and I have to think twice when i model, but It's okay since I'am still a architect student.
I have 2 GTX 580 3gb and think that i will be quite limited with the amount of ram.
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