The System section allows you to set graphics card options, memory limits & sound settings.
If your hardware does not support some of the options described on this page, then they will either not show up or be corrected on startup.
Cycles Render Device¶
- When set to None or when the only option is None: the CPU will be used as the computing device for the Cycles Renderer.
- If the system has a compatible NVIDIA CUDA device, it will show up an option for rendering with Cycles.
- If the system has a compatible AMD OpenCL device, it will show up an option for rendering with Cycles.
Memory & Limits¶
- Undo Steps
- Number of Undo steps available.
- Undo Memory Limit
- Maximum memory usage in Mb (0 is unlimited).
- Global Undo
This enables Blender to save actions done when you are not in Edit Mode. For example, duplicating Objects, changing panel settings or switching between modes.
While disabling this option does save memory, it stops the Redo Panel from functioning, also preventing tool options from being changed in some cases.
For typical usage, its best to keep this enabled.
- Sequencer Cache Limit
- Upper limit of the Sequencer’s memory cache (in megabytes). For an optimal Clip editor and Sequencer performance, high values are recommended.
- Console Scrollback Lines
- The number of lines, buffered in memory of the console window. Useful for debugging purposes and command-line rendering.
- Texture Time Out
Time since last access of a GL texture in seconds, after which it is freed. Set this to 0 to keep textures allocated.
- Garbage Collection Rate
- Number of seconds between each run of the GL texture garbage collector.
- VBO Time Out
Time since last access of a GL Vertex buffer object in seconds after which it is freed (set to 0 to keep VBO allocated).
- Garbage Collection Rate
- Number of seconds between each run of the GL Vertex buffer object garbage collector.
This panel contains the sound settings for live playback within Blender and are only available with SDL or OpenAL. To control these settings for exporting sound see the Encoding Panel and Audio Panel.
- Audio Device
Sets the audio engine to use to process and output audio.
- No Audio support (audio strips can still be loaded normally).
- Uses Simple Direct Media Layer API from libsdl.org to render sounds directly to the sound device output. Very useful for sequencer strips editing.
- Provides buffered sound rendering with 3D/spatial support. Used for 3D source support by Speaker Objects.
- Sets the audio channel count. Available options are: Mono, Stereo, 4 Channels, 5.1 Surround, 7.1 Surround.
- Mixing Buffer
- Sets the number of samples used by the audio mixing buffer. Available options are: 512, 1024, 2048, 4096, 8192, 16384, and 32768. Higher buffer sizes can cause latency issues, but if you hear clicks or other problems, try to increase the size.
- Sample Rate
- Sets the audio sampling rate. Available options are: 44.1 Khz, 48 Khz, 96 Khz and 192 Khz.
- Sample Format
- Sets the audio sample format. Available options are: 32 bit float, 8 bit Unsigned, 16 Bits Signed, 24 Bits Signed, 32 Bits Signed, 32 Bits Float, and 64 Bits Float.