It's worth to mention that you need to finish 10 (CPU generated) WUs first in order to get the full amount of (estimated) credits.

And if you have difficulties getting WUs assigned for your GPU/CPU than you should add "Beta WU".....see here:

https://linustechtips.com/main/topic/6971-how-do-i-get-foldinghome-beta-wu-i-want-to-be-able-to-use-gpu-core-17/

Now i'm close to 500k PPD.