u/2015morgan12

So from looking online for muscle strength I heard that 3 sets of 5 reps (assuming by the 5th you can barely do it) is best for strength I go to the gym 2 times a week sometime more an example assisted pull-ups on a machine I did 5x10 pulls another 5x10 with lighter weight but I seen no real strength improvement in fact I gotten worse sort of? So muscle improvement should I switch to a 3x5 plan am assuming there is more effective way but as basic person would this be one of the most effective things I could do

So my power supply is it's on its lost legs. And it's about time I upgrade I am looking to upgrade to 850 watt power supply versus my old 700 watt due to future proofing I'm looking at a budget of 80 to 120 pound maybe a bit more? I want one that won't have any coil wine usually these quiet and also that if it dies it won't take my components with it what am I looking at? Option wise