-- gpu-intensity 23 (and others) does not apply (Windows, console). And if I have parallel mining on the processor (by another miner), the hashrate falls. However, xmrig has the lowest priority in the configuration.
If you want to manually set the gpu's you must use all mandatory parameters (--gpu-id, --gpu-intensity or --gpu-raw-intensity, --gpu-worksize and --gpu-threads)So:
--gpu-id 0 --gpu-intensity 23 --gpu-worksize 64 --gpu-threads 1
Next release won't have this requirement