GPU Memory Write Rate (Bytes per Second)

What does this counter show?

This counter shows the rate within the current period that the GPU is writing data to the system memory bus in bytes/sec.

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 a consistently low, but the system is still memory bandwidth limited.

Memory write should be rarely a bottleneck. In the case that this counter is very high, try to reduce writing operations, for example reducing off-screen frame buffers, etc.