I can confirm this from my own experience. I threw in --shaders 2048 for good measure, and more importantly --gpu-engine 1065 which gave me the best hashrate but I doubt this will be the same for everyone, just note this overclocks the card and will lead to higher temperatures; try to keep it below 85 deg C and you should be OK, if your card runs too hot try undervolting it or just cut back on the engine clock.