ya there are adapters. IDK i personally think just about any bronze rated power supply from a good manufacturer like, seasonic or evga etc will be good enough for a p3, your barely drawing any power compared to what they are rated for. other thing is gold rating etc doesn't matter becasue psus are rated at an effciency when they are drawing a certain amount of power. So since your not going to ever draw like 1000 wats for example it's not going to run at whatever effeincy that would be at.

psu comes with 20+4

I believe you want one that has more power on the 3.3 and 5v rails. I typically use evga as their 24pin atx connector will allow the last 4 pins to "break off" for 20 pin, plus a lot of their units have good 3.3 and 5v specs.

Do a search though as there are a few great threads about this.

Thanks all, EVGA seems like the best option I can see due to the split 24 pin plug. Also like the modular design so I can leave off cables like pcie that I don’t need. Hopefully can find a good cyber Monday deal today 😀

Just found this deal! Only $75! Has two peripheral plugs for molex and floppy power. And the detachable 24 pin plug. Then can leave off everything else as it’s all modular. Also 20amps on the 5V and 24 on the 3.3V so should be good there too.

EVGA 750 BQ, 80+ BRONZE 750W, Semi Modular, 5 Year Warranty, Includes FREE Power On Self Tester, Power Supply 110-BQ-0750-V1 https://a.co/d/3QBPpje