Mga bros, nia nasad ko mangutana ninyo mga masters

(its somewhere here in the HW section) I recently built a new rig 2 months ago. And I encountered a problem with my AVR. Ani ang situation, my PSU is 850watts then I have 2 cheapo AVRs at home nga nag sunod ug ka guba after nako nagamit sa ako new rig. tsk3x...
So mao ni ako question before purchasing a new heavy duty AVR or UPS. Since I'm using a 850watts PSU do I also need to have the same or higher AVR/PSU wattage sa ako PSU? or sakto ra ang 500watts na PSU? and unsa na heavy duty na PSU inyong ma suggest?
Correct me if I'm wrong with my statements. Di man gud ko suheto.
salamat.