GPU Memory Interface Load

What does this counter show?

This counter shows the total utilisation of the GPU memory bus, for both read and write memory operations over the GPU memory interface within the current period.

What does a high value mean?

A constantly high value means the GPU may be accessing memory too often. On shared memory systems it is possible that this value may be low, but the whole system might be still memory bandwidth limited.

If this value is high, then you should attempt to reduce number of memory accesses. This can be achieved by removing texture fetches from the shaders or making textures more cache efficient using texture compression. There can be a small overhead reading vertex data from the Parameter Buffer. In these cases try to reduce the number of polygons or the number of varyings used in the shaders.