According to reviews, the 980 has way more speed for games than the 950 but according to https://developer.nvidia.com/cuda-gpus they both have a compute capability of 5.2. Does this mean there is no point in upgrading a 950 to a 980 if all I am looking for is better cuDNN performance?
compute capability is just an operation set and implementation details, like a haswell/skylake/… cpu architectures. GF950 has 6 SMs (a sort of CPU cores) while 980 has 16 SMs, so it should be ~3 times faster in most applications. i have no idea about any cudnn specifics though