Conventional PSUs use multi-rail technology which basically combines cheaper and lower wattage PSUs into one single PSU to generate a higher total wattage. However, smaller rails have lower maximum wattages so left over wattage on individual rails become too small to handle major components and gets wasted. Unique, continuous EasyRail technology enables you to maximize available power and make set-up easy. Stack numerous power-hungry components, such as your GPU, CPU and other components - without fear of crashing – with XFX ProSeries PSU with EasyRail Technology. In addition, this XXX Edition PSU has been awarded the 80 Plus Silver certification for its high power efficiency and is also designed for NVIDIA SLI and AMD CrossfireX multi-GPU systems, making it a perfect solution for hardcore gamers. One Rail, One Setup. Fans: 1 x 135mm Ball Bearing Fan (Black) Main Connector: 20+4Pin +12V Rails: Single PCI-Express Connector: 4 x 6+2-Pin SATA Power Connector: 8 Efficiency: Up to 88% Over Voltage Protection: Yes Input Voltage: 90 - 264 V