GPU Memory Total Rate (Bytes per Second)

What does this counter show?

This counter shows the rate within the current period that the GPU is reading or writing data over 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 low, but the whole system might be still memory bandwidth limited.

If this value is high, then you should attempt to reduce the number of memory accesses. See the read and write specific versions of this counter.