Oh, and as for the question of when should you undervolt, anytime you can get away with it. Oh and disable the power efficiency setting as that was just for managing it overdrawing the PCIe slot IIRC, and I'm guessing your card has more robust power delivery on card so it shouldn't be doing that anyway. I also set the FPS limit to 60 (same as my monitor), and disable Chill (since Chill causes some wonky behavior, dips and stuff in certain games). I forget why, but for some reason that helps AMD cards so that it'll maintain max performance or something and isn't about the actual power use or efficiency or what it seems to imply (so its not telling the card to disregard TDP and go for broke, its basically saying "hey, you've got headroom, use it" when combined with the lower voltages). Also remember to increase power limit by the max (50%). I think I just looked at what others were doing and then went a little more conservative and much lower heat and much less noise, with lower power use, and all the performance I was getting before (I OC'ed the memory a bit, and upped some of the clock speeds at the higher end of the P-states). For figuring out what you can go with there's probably guides, and probably even people that made a table so that you can start with a pretty good guess what voltages you can do for the ASIC quality of your card/chip, or you can spend a lot of time testing for stability. With AMD's cards, undervolting actually tends to bring increased performance, especially sustained performance because their stock voltage settings are stupid high and thus causes it to not hold turbo clocks for long if at all due to the heat/power.
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