我用 A II 250 780G 4670 Driver 9.10
測試結果

Peak CPU->GPU Bandwidth = 5.516 GB/sec [data size = 4194304 bytes]
Peak GPU->CPU Bandwidth = 759.166 MB/sec [data size = 33554432 bytes]

GPU->CPU 怎麼都比較低啊！PCIE 2.0 不是應該更高的頻寬嗎？