New GPU made Express rendering times slower
I have used Hitfilm Express for a while and enjoyed it on integrated graphics (Intel HD 530, to be exact). Some long rendering times and a few gpu-related crashes later, I decided it was time to get a dedicated video card. As a basic benchmark of the new card vs integrated graphics, I made a test: rendering a 30 second HD clip with the motion blur preset. The integrated chip did it in around 4:50. Then I installed my new gpu (a 1050 ti), and rendering time was far longer (around double the time). Unless I am gravely mistaken, this should not be occurring - according to gpubenchmark, the 1050 ti is around 4.5x faster than what I had.
Testing was done with Hitfilm 4 Express (I have Express 2017 as well, but used 4 to remain consistent), and my drivers are up to date. Other components: Intel i5 6500 & 8 gb ddr4 ram.
Does anyone know what is causing this problem?