Yup. I have 5 rx580 and I can set the clock, mclock without any problem, but the voltages stay at the maximum level, using more than 1200w. Also, the memory clocks are reduced to 1000mhz from time to time (maybe because it's hitting the max TDP value for the card). So, unless claymore fixes this issue, I recommend that you don't apply any tweak to your card using the claymore miner and do it with msi afterburner or other compatible tool.
And also, on these newer beta drivers, there's no need to patch the driver if you only have rx500 series gpu's.