I took a couple of hours today and came up with a performance scale based on PG for Nvidia cards. the 5XX series might be a little off dew to lack of data I spent about 6 hours on it. They are all based on stock speeds.
https://docs.google.com/spreadsheet/...URsb3NxazU4RkE
The newer ones are more efficient so the performance gflops are modified to show such.
I updated this today with the 6XX series if anyone is still using it.