Just got a 3800x yesterday and did some testing, I am satisfied with stock performance. It also seems to play well with my MSI B350 Pro Carbon. One caveat though, high voltages don't seem limited to low threaded tasks. I am running the latest bios from MSI's site, (Released December 3rd) as well as the November 25th chipset drivers from AMD. I began testing at all stock, including memory.
I was expecting to see some high voltages (upwards of 1.4) for max boost in lightly threaded scenarios.
What I did not expect was for the CPU to maintain voltages around 1.38-1.39 (sometimes higher) in cinebench (all core).
It does preform as expected on stock, with a 4.525 single core and 4.25 all core boost, but the voltage readings from Ryzen Master are definitely concerning for sustained use. Bios options seem to be a bit limited as compared to an X570 board, although 4.3ghz @ 1.275 manual voltage is stable (and according to Ryzen Master, it still reduces voltage at idle).
What confuses me is why the chip is so adamant about pushing voltages that may be unsafe for all core scenarios. It appears it can easily make do with a full .1v + less while maintaining a clock higher than the automatic boost. On my board, offset voltages have mixed results: With the boards basic offset, it seems to just increase voltage when set to '-' which on my first gen chip was a negative offset as expected. Another option, 'AMD Overclocking' has offset options from -25mv to -100mv. When using the -100mv offset, all core voltage hovers around 1.35v which is still higher than I would like to see.
I am simply concerned for the longevity of the CPU here and would like to hear about what others have experienced with their stock 3700/3800x CPU's. I am wondering if it is just my board, any help is much appreciated!