> True, the GPU is the ultimate SIMD processor. But in many cases, the SIMD task is too fast to go to the GPU. In particular, the Base64 encoder was encoding 20

> True, the GPU is the ultimate SIMD processor. But in many cases, the SIMD task is too fast to go to the GPU. In particular, the Base64 encoder was encoding 20GB/s, while PCIe can only transport 15.6GB/s!! The CPU is done before the data even gets to the GPU. That seems like a good case for using integrated graphics that has access to the CPU's memory controller and so can access data directly without copying it over PCIe. Though if you're running that kind of volume you may have PCIe as the bottleneck in any case to access the data on whatever storage/network device.