I'm very proud of my +5 year old GTS 450 it regularly shows up in the top 25 Windows GPU's. Obviously I would like the GTX 980 but its way out of my budget! It might be last on this list but I proud of the little GPU that could!

Windows
1.(1.000) GeForce GTX 980
2.(0.985) GeForce GTX 780 Ti
3.(0.945) GeForce GTX 770
4.(0.920) GeForce GTX 970
5.(0.900) GeForce GTX 980 Ti
6.(0.875) GeForce GTX 780
7.(0.865) GeForce GTX 670
8.(0.809) GeForce GTX 760
9.(0.795) GeForce GTX 680
10.(0.718) GeForce GTX 580
11.(0.702) GeForce GTX 570
12.(0.684) GeForce GTX 560 Ti
13.(0.684) GeForce GTX 660 Ti
14.(0.671) GeForce GTX 560
15.(0.663) GeForce GTX 660
16.(0.596) GeForce GTX 960
17.(0.588) GeForce GTX 690
18.(0.580) GeForce GTX 460
19.(0.503) GeForce GTX 750 Ti
20.(0.498) GeForce GTX 750
21.(0.458) GeForce GTX 550 Ti
22.(0.456) GeForce GTX 260
23.(0.364) GeForce GTX 650
24.(0.354) GeForce GTS 450

This list is not very reliable.
E.g. it do not account properly for people running more than one task/GPU
Running 3 tasks/GPU may give more production but every task takes more time and the server thinks (wrong) that the GPU is slow.

If you decide to change the GPU most people here will suggest GeForce GTX 750 Ti
It have the best ratio Performance/W (uses only ~60 W)

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- ALF - "Find out what you don't do well ..... then don't do it!" :)