Hmm, I added my fourth semi-backup PC, with RX 580 and RX 470 "mining" cards, to do BOINC for PG challenge, but once those two GFN22 WUs are done (1 more day, I hope that they get done before the challenge is over), then I'm either going to mine with them, or turn them loose on F@H too. It would be so sweet to hit 3Mil PPD for me, maybe I could hit 50Mil points for the month. That's what I'm hoping to break. Consider it took me this long to even hit 100Mil (years?), then a 50% increase in total points in one month would be kinda neat. (I realize I can't quite compete with you high-PPD peeps with multiple RTX 2080ti cards, but for my meager funds, this represents a bit of a high-water mark for my production. Four new cards this year. Retiring the Polaris cards, if I can find buyers. Or, I'll hook some friends up with them for gaming builds.)
Edit: I'm relying on mining to essentially "pay off" the new video cards I got this year, I don't know if they will earn enough to make that work out. Use them for F@H in Dec., pay for themselves the rest of the year, except for the warmest summer months that I would normally have to run the A/C for. (No sense in running "intelligent heating" and A/C at the same time...)