Both machines are running fresh installs of Creative Cloud and all apps are up to date. For some reason Machine 2 (with a less powerful video card and 16GB less RAM) is rendering about 3 times the speed of the other workstation. They are using identical LaCie 2big RAID drives with Thunderbolt 2. I have tried swapping drives between machines to make sure it wasn't a drive issue and Machine 2 is still faster than Machine 1.
I have gone through preferences and everything is identical between machines and they are both set to use "Mercury Playback Engine GPU Acceleration (OpenCL)" as the Renderer in Adobe Media Encoder.
Has anybody run into this problem or know what could be happening and a possible solution?