I refuse to push it any further than this (@ 1.375 V). I still have memory to play around with.
Here is my current overclock that I am very happy with (@ 1.28125 V). I use this 24/7, but frankly the 3600 is already overkill for what I do, so I have all power saving options enabled. Consistent 70–90 fps in Grand Theft Auto V/Online with an overclocked (and not flashed) RX 460 at 1080p high–very high (from a variable 40–60 fps with my previous CPU) is nothing to sneeze at. Now it's the GPU holding my CPU back!
It will also do 4,200 MHz at stock voltage (1.1 V), and 4,425 MHz at 1.3 V. The newer silicon is definitely better.
Here is what I upgraded from (the CPU could do 4,600 MHz, but the board was trash for that). Next, I'm looking into possible GPU upgrades during the Black Friday sales.