Computers require a certain amount of power to function correctly. Too much power is just wasteful and too little has adverse effects on the system's performance. A gaming system with multiple graphics cards, for example, will require more power than say an HTPC using integrated graphics and low wattage CPU. It is reasonable to say then that, when considering power demands and overall system efficiency, we would have to say that size matters. Turning our eyes toward a gaming system, we will look at a gaming capable power supply from Thermaltake.The Thermaltake Tough Power 750 XT is a multipurpose power supply that can easily handle the demands of most systems The Thermaltake Tough Power 750 XT is rated for 750 Watt operation, and packs a massive punch for any system's needs. The construction of the case is quite sturdy, housing the components to power any rig. The Tough Power 750 XT comes with full certifications for SLI and CrossFireX for gaming.