Nvidia GPUs, that support ECC, do this. I believe it's called inline ECC and does cost latency, bandwidth, and memory capacity.
This helps, but ideally the entire path from CPU to Dimms is wider and covers not just what is being read or written, but also the address it's being written to. After all writing the correct bits to the wrong address is a serious failure.
This helps, but ideally the entire path from CPU to Dimms is wider and covers not just what is being read or written, but also the address it's being written to. After all writing the correct bits to the wrong address is a serious failure.