I've been eagerly waiting for this issue to be resolved since December, but seeing it's still ongoing, I decided to report it. I really want to stay up-to-date with my drivers but this issue is preventing me from updating.
On 17 series drivers (including 17.3.1) on some titles (I'll use World of Warships as an example) I get stutters when running them fullscreen or borderless fullscreen. The stutters occur every ~1 second and last about 0.5-0.25 seconds which makes the game unplayable. During the stutters my whole controls freeze, including mouse control.
I checked what's happening with Wattman and here's what I found out when playing World of Warships:
When I switch to the game and make it fullscreen, my memory speed momentarily drops down to 300Mhz along with some GPU speed fluctuation. When I alt tab, and let it run in the background, it runs perfectly.
I did a clean install of the driver (With DDU) and the issue is still there. Windows power settings make no difference.
The only solution I found is to roll back to 16.12.1 drivers, which work flawlessly in the same situation. Obviously I can't stay on this driver especially when I want to play the latest titles . . . which is exactly what I had in mind when bought an RX480.
My system specs:
MSI RX480 8Gb Gaming X
16GB DDR4 RAM (2100MHz)
600W EVGA PSU
Windows 10 (64 bit)