4 reasons you shouldn't use an SFX power supply in a standard ATX build
SFX power supplies are best used for what they're made for: small-form-factor PCs

The power supply is one of the most important parts of any PC build, and while it's certainly not the most flashy component, it's one that your computer relies on for everything. Having a PSU that is built with good components and has been tested to be reliable is paramount, but that doesn't mean that you can't find a deal on one.