Turns out I made a mistake
I'm not home right now, had to call my dad yesterday and I asked him which power supply is on my PC, turns out it's a CX430, not a CX550, those with the green name on the side. He (my dad) bought a CX550 for his PC last year, that's why I switched the names. My bad!
Btw, I decided to go with a G3 550W, it's already waiting for me when I come back home, let's see how it performs. Thanks for poiting out my mistake!