I spent most of last night researching a safe voltage for Rzyen, auto voltage on my Asus C6H seemed rather high. But never did find any consensus as the answer seemed to vary depending on whether one was talking about Zen, Zen+, Zen 2, Zen 3, etc.AMD has stated that seeing those 1.4+V numbers is fine though.
I opted for 1.35V on my Ryzen 2700; in part, because my cooling sucks. The case fans that came with the Define R5 are suppose to be 1,000 rpm, but neither come anywhere close. The better one barely does 800 rpm; plus one or more of them make that weird clicking noise like a cable is touch the blades.