There are some issues with how this measurement works and the fact that there are only a few examples. Additionally high end cards tend to run multiple work units at the same time, which I failed to account for properly. It is mostly an issue for milkyway. which is the primary FP64 project. Hopefully I can fix this in the next version. Here are some more accurate results for Titan V: https://steemit.com/gridcoin/@cautilus/my-quest-to-use-an-nvidia-titan-v-for-boinc-titan-v-and-1080-ti-boinc-benchmarks