ST-220FUB-05E ReadyNAS NV, NV+ RND4250 PSU replacement power supply. This power supply has the 20 way motherboard connector modified for the NAS requirement and is ready to go. It is fitted with a suitable extension lead to make total length 41 cms long. The additional Sata and Molex connectors are tied up together for neatness, as these are no longer required in the NAS application. Based on FSP220-50LC or the FSP250-50GUB 220 / 250 watt fan cooled model. Air exhausts at mains input end, even without modifying power supply carrier. Power Supply also has 80 plus bronze efficiency.