Hi guys, I hope someone of you can clear somethings for me about parts compatibility.I am looking to buy a new pc in parts and to save few bucks i want to use my old GPU( Radeon 7770HD) and power supply(corsair vx 450w). The new ring should look like this https://pcpartpicker.com/list/qM4mf8. I know the gpu i old but it works fine for me and my needs in playing game.So i was wondering if the power supply will be enough to power up the new ring or should i get a 550w power supply?