Have you just built a mining rig featuring four high end graphics cards or are you currently configuring a system incorporating dual AMD R9 295X2 graphics cards? Regular KitGuru readers will have seen our recent review of the Overclockers UK Infinity Vesuvius system (http://www.kitguru.net/desktop-pc/zardon/overclockersuk-infinity-vesuvius-r9-295x2-quadxfire-system-review/24/) ? which could demand almost 1,200 watts at the socket. If you are building a similar system, then a 1,500 Watt power supply would be a wise investment.