Using bandwidthTest, D2D performance exceeds theoretical bandwidth

[Robert_Crovella]

Using bandwidthTest tool, D2D performance More than the official given bandwidth

Using bandwidthTest tool(/usr/local/cuda/samples/1_Utilities/bandwidthTest/), D2D performance（864.3GB/S） More than the official given bandwidth（NVIDIA GeForce RTX 3080 760GB/S），Whether it is reasonable or not? why? When calculating bandwidth, why multiply by 2.0，test code as follows: // calculate bandwidth in GB/s float time_s = elapsedTimeInMs / (float)1e3; bandwidthInGBs = (2.0f * memSize * (float)MEMCOPY_ITERATIONS) / (float)1e9; bandwidthInGBs = bandwidthInGBs / time_s; The test data i…