Overclocking the 5600 XT using the new AMD tuning tool in its 2020 software is very straightforward. There's an 1820MHz clock speed limit that my card could run at no problem, and there is also an 1860MHz (14.88Gbps) memory limit that my card could also achieve. I would not be surprised if the cards could run even faster, but currently that is locked down without some sort of mod.
Average clock speed under load
Maxing out the frequency slider didn't make that much difference to our average clock speed as we saw just a 39MHz (2%) increase.
Games
With 2% higher GPU clocks, and 6% higher memory clock, it's not a huge surprise that real-world performance didn't change much with this overclock applied. 3DMark scores increased by 3%, as did Metro Exodus frame rates. F1 2019 saw just a 2% frame rate increase, while the best result came from Gears 5 which saw a 4% performance boost.