View Full Version : Influence of memory brandwith
Where would you say in 3d worlds memory brandwith becomes more decisive (besides AA for instance)?
Where would you say in 3d worlds memory brandwith becomes more decisive (besides AA for instance)?You can't really answer that without a lot more context.
Typically you'll get 3 potential bandwidth bottlenecks:
1. Texture fetching: Where a pixel shader is pulling lots of samples from either lots of different textures, or from the same texture.
2. Output writing: Where there is lots of reading/writing from the frame buffer (e.g. lots of alpha blending)
3. Geometry: Much rarer in my experience, but you can get the transform unit stalling when waiting to fetch more vertices/triangles.
The most major consumer of bandwidth is usually the Z-buffer, although the colour buffer can generate more traffic if blending is on, Z compression is good and the Z ordering is poor.
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