I have a GTX980ti and an i7-6700k build that is my gaming pc. I will render videos on here from time to time. I also have a Phenom II x6 1100t and Radeon HD6850 build that i mainly use for rendering. The Older build renders videos, 2-3 times faster than my gaming build. I was thinking maybe its because OpenCL on the older build is more optimized with sony vegas than using CUDA on my gaming build? They both have 16Gb ram. Older build is DDR3 and newer build is DDR4. Maybe this is because graphics cards render videos out slower than cpu's and since the option in sony vegas is only "Use OpenCL if supported" so im thinking that maybe on my older build it is choosing the 6 core Phenom processor over using the Radeon 6850. And the 6 core Phenom processor is beating out the GTX980ti using CUDA? This baffles me, and all videos are being rendered at 1080p 60FPS