The finish on the X4 is a very durable flat black with matching black modular connectors. Basically mirroring the number and type of cables provided, there are connectors on the side for the main ATX, separate 4-pin and 8-pin +12v, three 6-pin and three 8-pin PCI-E, four SATA and four Molex. The X4 logo is stamped on either side of the power supply case, and the rear houses the AC power socket, on/off rocker switch and mesh grill for exhaust airflow. It's surprising to see a relatively large 1050W rated power supply like this have such small dimensions, only 6" wide by 6½" long and 3½" tall. Many manufacturers units including even the Ultra X3 begin growing in length once they reach 700W or so. Typically the extra space inside is needed to house the additional power components.


A single 135mm fan is used to cool the X4 1050W, and a black wire grill with brushed Ultra X4 logo protects the blades. The X4 1050W is rated for 24A on the +3.3v, 30A on the +5v and a whopping 76A on the single +12v rail, which is preferred over most multi-rail +12v configurations for high-end graphics card setups. This is the same principle that was used in the X3 series and we're happy to see Ultra continue this in the X4 line. The UL certification E239028 indicates that this power supply is manufactured by Andyson International, a Taiwanese OEM for brand names such as Hiper, Raidmax, Aerocool and Sunbeamtech in addition to Ultra. If weight is any indication of the quality of components used, the 1050W comes in at a hefty four and a half pounds.


The X4 600W shares the appearance of the 1050W, down to the exact same finish, grill treatment and dimensions. Indeed the only way they can be differentiated is by examining the number of modular connections or checking the label. Just as we saw with the cable count, the 600W offers one less SATA connector and only one each of the 6-pin and 6+2-pin PCI-E cables. The ratings for the +3.3v and +5v are 24A each, with 37A reserved for the single +12v, less than half that available on the 1050W. Andyson is listed as the manufacturer for the 600W also, and it weighs only half a pound less at four even.