Hardware Secrets posted a review on the Ultra X4 500 W Power Supply
A quote from the article:
>> Ultra X4 500 W Power Supply Review
Ultra has recently launched a new power supply series, X4, with seven models featuring a complete modular cabling system and single-rail design. We've already reviewed the 850 W model from this series and now we are going to dissect their 500 W version.
>> Ultra X4 500 W Power Supply Review