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31 votes

How can one do rendering with Cycles using an NVIDIA RTX GPU?

Update as of July 29th 2019: NVIDIA RTX GPUs are now officially supported and can be used to accelerate renderings in Cycles using the raytracing cores of RTX cards. You can read more about this from ...
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20 votes

Why/how does tile size effect performance?

The difference and why there are different optimal bucket sizes comes from the size and design of on chip cache/memory of cpu or gpu. The gpu has a massive amount of cores. But they are dumb and ...
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16 votes
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GPU slower than CPU?

I'm not sure if you really have any problem here. Actually here is common mistake made by a lot user that are not into programming. GPU rendering is NOT faster than a CPU rendering, GPU rendering is ...
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  • 184
16 votes
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GPU compute grayed out

Go to "File"->"User Preferences" and click on the "System" tab. On the left it should say "Cycles Compute Device". On my machine (I have the same card) when I change from "None" to "CUDA" the GPU ...
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13 votes

Why can't I use GPU rendering in Blender?

Blender Cycles relies on GPU compute languages like CUDA or more recently OpenCL. CUDA is exclusive to Nvidia and while OpenCL is technically cross platform, in practice AMD's implementation is the ...
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  • 1,620
13 votes
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Rendering on command-line with GPU?

The following script allows you to enable all GPUs and optionally all CPUs as well. ...
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13 votes

AMD GPU Material in "material preview mode" and "rendered mode", is entirely gray as background. Only outline is displayed

Update: Blender 2.92.0, 2.91.1 and 2.83.11 will contain workarounds for the missing / incorrectly rendered surfaces of mesh, curves and metaballs as well as the incorrectly rendered wireframes caused ...
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12 votes

Why can't I use GPU rendering in Blender?

I'm quite surprised at the amount of false information here. First off Intel does indeed support OpenCL, as far as I can see up to 2.1. Not only this, but I have actual field experience with ...
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  • 250
12 votes

Is it possible to render a movie on a single computer in blender?

It is possible to render a movie on a single computer. It depends on what movie it is. If you choose a style that renders extremely fast, it is possible. Nothing like the ones Disney make though. Not ...
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11 votes
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Does Blender support dual-GPU rendering if the two GPUs aren't the same?

You can, as long they are from the same brand (AMD, or NVidia) you should be able to use them simultaneously to render in Blender Cycles. If you keep them out of any proprietary GPU pairing ...
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11 votes
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Why can't I use "GeForce 9500 GT" for GPU rendering with Cycles?

The NVIDIA GeForce 9500 GT is from the GeForce 9 series, which doesn't fulfill the minimum requirements for Blender 2.8x. Supported Graphics Cards NVIDIA: GeForce 400 and newer, Quadro ...
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11 votes

AMD GPU Material in "material preview mode" and "rendered mode", is entirely gray as background. Only outline is displayed

As mentioned in the bug report T82856 a temporary solution is to enable High Quality Normals under the Performance section in the Rendering tab on the right in a default Blender layout.
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  • 111
10 votes
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Can you render using the CPU with Eevee

The Blender EEVEE render engine uses OpenGL for all the rendering, so YES, rendering on the CPU should be completely doable, as long as a viable CPU-based OpenGL implementation is also installed and ...
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  • 1,380
9 votes

CUDA rendering on Linux Mint or Ubuntu variants

You will need to install the package nvidia-modprobe which (I believe) allows Blender to detect your nvidia CUDA device. This is applicable to Mint, Debian and ...
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  • 460
9 votes
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Is it possible to do OpenCL rendering on Intel processors?

As it's still quite experimental and there are quite a few features still missing, it's only enabled for AMD gpus by default. It's possible to "force" it to work on other opencl devices by ...
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  • 153k
8 votes
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Cycles / CUDA Error: Out of Memory

The short answer is that SSS on the GPU eats up a lot of memory, so much so that it is recommended to have more than 1 GB of memory on for your GPU. This was mentioned in one of the videos from the ...
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  • 2,507
8 votes
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OpenCL vs CUDA Rendering

Go with the Nvidia. Performance aside, CUDA works better with Cycles. Until recently, OpenCL was not even supported in Cycles so it is not as bug-free and stable as CUDA. Another thing to consider ...
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8 votes
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Can the GPU be used while video editing

No there is no GPU assist for the VSE (sequence editor) and before you ask, no you can't have more cores either. You can make an OpenGL render (without audio IIRC) though. If you look at an OS task ...
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  • 8,804
8 votes

Why does Denoising take up so much memory?

Like Cegaton said, it uses the other tiles in the memory. Using that logic, I ran a test, and found that if you reduce the tile size (in the performance pulldown) the image renders using much less. My ...
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  • 133
8 votes
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How can one do rendering with Cycles using an NVIDIA RTX GPU?

You cannot enable it since it is not yet supported. You will need to wait until it is, or attempt to build Blender with the support for Cuda 10 yourself apparently.
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8 votes

Mac Pro Tower - Sapphire Radeon Rx580 is really, really slow

Unfortunately Apple has deprecated OpenCL and OpenGL in favor of their own Metal API. In fact, Blender has recently dropped OpenCL support on macOS completely, due to too many bugs in the macOS OpenCL ...
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  • 153k
7 votes

Enabling GPU rendering for Cycles?

Also note that you need to change 2 settings to enable GPU rendering. The obvious one is in the User Preferences, System. You also need to set it for the blender file (scene) by clicking on the ...
7 votes
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GPU render with multiple cards: Does card order matter?

So I just tested this: No, card order does not make a difference. Doesn't really matter which one is set as system (if the system is doing nothing) or to which the monitors are plugged. The render ...
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7 votes
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How do I get Cycles to use GPU on a linux server?

For enabling the device for use, see bpy.context.user_preferences.system.compute_device_type and ...
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  • 153k
7 votes

What is GPU tile size contingent upon?

The infamous answer to this question is: It depends The 256 x 256 recommendation that is given many times is a very good starting point. In general it will lead to decent render times and sufficcient ...
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  • 10.8k
7 votes
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Use Blender Cuda Build to use GPU in Simulations:

I think you've misunderstood the description for that build. It is merely stating what features were enabled at compile time. It's possible to build Blender without some things, such as the smoke ...
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  • 8,917
7 votes
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Scene complexity and VRAM

I bet those 4x8GB gpus are much faster than single 32GB card. Here are some options: Get the faster setup and a renderer that can do out-of-core rendering like Octane or Redshift. This allows your ...
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