I've got an issue with RX480 - low GPU usage(100%-0% spikes) and low FPS in games( Tomb Rider 2013, ROTB, Witcher 3 etc.). This issue is not depending of quality settings,and on all settings i've got about the same low FPS.
CPU: Xeon 1241 v3, RAM 2x8GB 1600, WIN7x64, MB ASUS H97M-E, HD Samsung 850 EVO 240gb, WD Black 2TB 64Mb cache. GPU Saphire RX480 NItro+ 4GB.
Tried to OC my ram,(1600 -> 1866) but, unfortunately this didn't solve the problem.
Seemed like VSYNC is turned on, but i've checked several times, it's off.
DxDiag, screenshots and videos on the link : https://drive.google.com/drive/folders/0BxsqbitpjHGrUlhLd2I2UHREMlU?usp=sharing
Thank you in advance for your help!
Best Regards, Alexander.
P.S. Doom@Vulkan runs pretty well, 120-140fps on 1920x1080.