Specifications:
https://en.wikipedia.org/wiki/GeForce_900_series
http://hexus.net/tech/reviews/graphics/85553-asus-geforce-gtx-950-strix-direct-cu-ii-oc/
Comparing Processing Power, TDP and efficiency
GTX 750 Ti: 1306 gflops, 60 watts - 21.76 gflops/watt GTX 960: 2308 gflops, 120 watts - 19.23 gflops/watt
GTX 950 (first source): 1572 gflops, 90 watts - 17.46 gflops/watt
GTX 950 (second source): 1825 gflops, 90 watts - 20.27 gflops/watt
1572 gflops is not enough for the current generation.
If GTX 950 is really weak, it will be a shame because both GTX 750 and GTX 960, which are older, are more efficient than it.
I believe it is 1825 gflops. If that is true, then I will buy it.