Hi all. I've recently upgraded my old rig, but kept my old PSU (CoolerMaster 850w) and case. I already found a nice case I want to buy to replace my old one (FractalDesign Arc Midi R2). I was thinking to get a Crosair Gold 850W PSU, but just wanted to ask if I even need Gold certified? I will eventually buy another gpu to crossfire with my current one, and I'm going use this pc for gaming and working. Power efficiency wasn't my top priority to be honest, and I was mainly looking at Corsair PSU because its modular, and I read somewhere that a good PSU can help with overall stability of the system. But if I can save some money and get bronze/silver, that'd be great (captn. obvious here). Can anyone help me with an advise, and maybe suggest good PSU options for my rig? Thanks in advance!