Is an RX580 on a CX450 psu fine? in Graphics Cards Posted September 28, 2019 2 minutes ago, seon123 said: Please avoid spreading misinformation. If you have no idea what you're talking about, it's often best not to. The 2017 CX is quite decent. LLC resonant primary, DC-DC and a rifle bearing fan. Unlike a lot of EVGA's stuff, which often uses sleeve bearing fans and group regulation on the low-mid range. That's a great way to just waste time. PCPP's calculator overestimates, and when a part doesn't have a number for the power draw, it assumes it's 0W. Particularly the motherboard and RAM power draw is exaggurated. It's more than fine. Just make sure the GPU only needs a single PCI-e 8 pin to work. Here's the power draw of the XFX Fatboy. The power draw goes up to about 230W, so accounting for the rest of the system, expect around 300W draw from the PSU under a gaming load. Hide contents https://pcper.com/2018/11/the-amd-rx-590-review-featuring-xfx/7/ Thanks a lot for the well-made answer man. Appreciate it Just to be sure, if i were to purchase a 590 instead, i'd be plenty fine right? The recommended PSU is 500w for both the 590 and 580 but i'd heard it drew less power being a different, more efficient die, but you seem like you would know more than me about that lol.