Ultra X4 500 W is a very good 500 W power supply, being able to really deliver 500 W at very high temperatures, efficiency between 82% and 86%, voltages very close to their nominal values and very little noise and ripple. The full modular cabling system is a very nice feature and it comes with the correct number of cables for a 500 W product.

The only negative thing we could say about Ultra X4 500 W is its price: costing USD 100 it is one of the most expensive 500 W power supplies around. For this price you can get a 750 W power supply like Seventeam ST-750P-AF, however Ultra X4 500 W provides higher efficiency and comes with a fully modular cabling system (besides being limited to 500 W, of course) and it is on the same price range as 500 W units from Zalman and Enermax.

This way Ultra X4 500 W is one of the best 500 W units around – until someone releases an 80 Plus Silver or Gold 500 W unit.