GPU running at full speed usually occurs going out of sleep mode on both Sapphire R7 370 Nitro and RX 470 OC. With 17.2.1 fixed it with the RX 470 until this morning. I didn't activate Wattman all I do is toggle on Power efficiency since I installed the RX 470.
I have ran the latest version of DDU and re-installed 17.2.1 at clean install mode but still didn't reinstate the dynamic clocking for the GPU memory. RX 470 OC at default setting
Asrock 970 Extreme 3 R2.0 with FX8370
Sapphire RX 470 4GB GDDR5 OC(Titanium)Elpida
32 GB DDR3 (Kingston Fury 1833 set at 1600 4x8 GB)
Dual Display at 1080 using 2 display port to hdmi cables
Philips 273V5 primary Philips 243V5 extended
Antec True Power Classic Gold 550W
I opened Wattman and the gpu memory set at 1750 Max, set it at dynamic but still stuck at 1750.
Strange It was working great.
Whatever the cause, can't trace it. System restore fixed it.
Sapphire Tech support also recommend when things go wrong, on preferences>restore factory defaults.