A couple of years ago it genuinely was cheaper to build your own system with your chosen components instead of opting for a premium prebuild. However, pre-built machines may be the cheaper option in the coming weeks, now that a new 40 series of GPUs is being released. As new machines with those 40 series graphics cards are assembled by manufacturers, it's much more likely that our current picks for best gaming PC that house 30 series cards will drop down in price.