Upgrading my ITX build, all compact so no over locking will be taking place. PSU is a Corsair SF450 and the system will be: I5 8600 Zotac GTX1070Ti mini 16gb (2x8gb) 2400mhz memory 1 SSD 1 2.5" 5400rpm HDD 2 case fans and a few usb peripherals as usual. Test systems with higher specs seem to only draw around 300w at full load for gaming from my reading, and the SF450 has excellent efficiency throughout the range i.e. over 90% at pretty much everything bar the lowest loads. Will it be enough? I'm assuming yes, like I say no overclocking will be done and surely future systems are likely to reduce in power generally. I'd also expect that since the PSU comes with a wide array of connections including 2 8 pin pci-e, that a single 8 pin GPU and a 65w CPU should be easy.