Together with an APC SmartUPS SC 620 this PSU worked normally at loads up to 370W (from the mains) and 310W (from the batteries). If the load was higher than these values, the UPS reported overload when switching to the batteries, yet went on working.
The output voltage ripple is overall normal, yet the individual spikes provoke some apprehensions.
Alas, there are also low-frequency pulsations at the PSU output, and the combined ripple on the +5V rail is slightly above the maximum permissible value.
The cross-load diagram looks good. Even though some portion of it is red, this red section falls on the range of very high loads, not only on the +12V rail but also on the +5V and +3.3V rails, which is not usual for a modern system.
The PSU employs a 135x135x25mm YLTC DFB132512H fan.
The speed of the fan is varied from 1000 to 1950rpm, making the PSU average in terms of noise. It does look good among 1000W model in this respect, especially in comparison with the PSUs from Thermaltake, let alone from FSP Group.
The efficiency is not as high as you might wish. It is barely above 80% at the maximum and drops to 77% towards the full load.
So, the Ultra Products ULT-HE1000X falls into the same category as the above-discussed PSU from Floston. It is a good mainstream model that provides reasonable characteristics and is free from obvious defects. Interestingly, this PSU behaved differently in my tests than the ENFP-1050W despite the external resemblance between them. It did not pass the output voltage ripple test but only slightly exceeded the permissible limit. The good thing about this PSU is that it comes with a broad selection of cables of various lengths, which facilitate the process of connecting the devices of a particular PC system.