You shouldn't worry too much about that even if the card would consume at it's max rated TDP which is like 170W, which is not, but you can give it a rough approximation with that number. If you want to partially cover the costs of that you could fold part time for team EVGA as well, they have a reward program, they give you EVGA folding bucks, max 10 US $/month that you can use as store credit when you buy directly from EVGA. This year there is I think 1.5 mil points for 5$ and 3 mil for 10$. In your client you just input the EVGA team number instead of HWC and you are set. You will have to create a username on the EVGA forums as well and it will have to coincide with your folding id.