I have a GTX660 2GB and am wondering if upgrading it will have meaningful impact on editing and encoding 4K h.265 & h.264 clips using CC 2015 Pr and AME. I do a lot of encoding to preview h.265 100Mbps drone footage (4K TV only handles max 50Mbps). My 3.06Ghz 12c 64Gb cMP handles playback pretty well on Pr timelines, but I'm only previewing in HD as I don't edit with a 4K monitor. I note that CUDA is best encoding performer in AME over OpenCL or CPU only - but I'm not sure what is more important in a card CUDA cores vs RAM vs clock Mhz? yeah, yeah "all of the above"... I don't want to blow alot $$ as I don't game on Mac...I put a few parameters into an xls to help me compare a couple of options of 2nd cards I see in my local area...I came up with a score based on cuda, clock, ram and price relative to scale of 1 being my old GTX660 which cost me $199 new a few years ago...the GTX1070 comes out on top basing on 2nd hand prices (AUD). The score is cal using my GTX660 as reference i.e. new core count divided by gtx660 core count multiplied by clock speed, similarly for ram then minus relative value of price to obtain overall performance-value...980ti just for comparison I don't wanna mess with power options of risk reliability.