I often have a problem with OpenCL accelerated Mercury where in spite of my switchable graphics settings Media encoder uses either both my intel integrated graphics (HD 530) and my discrete graphics (FirePro W5170M), thus under-utilising my discrete graphics or just out right prefers my Intel integrated graphics. My CPU is an Intel i5-6300HQ. If Media Encoder offered an option to select which device(s) to utilise for HW acceleration that'd be amazing.