Ultra X4 ULT-HA850X 850W

  • Ultra X4 ULT-HA850X 850W
Browse 14 reviews so far
  • Excellent:
  • Good:
  • Average:
  • Bad:


  • Fully modular design, Beautiful fit and finish, Nice accessory set, Relatively compact, Stable, Pretty quiet, Efficient, Dedicated fan cable, Lifetime warranty
  • Tested out well in terms of regulation, ripple, and efficiency, Very quiet, Fully modular, Attractive, no nonsense appearance, Cables are well finished, plentiful, and long enough for most cases, Nice bundle of accessories
  • Excellent performance, Warranty, Modular Cables, Quiet


  • Expensive, Stiff cables, Louder and hotter than expected
  • MTBF temperature: 25C, maximum ambient operating temperature: 40C, MSRP of $250 (US), Limited availability, I killed it

Expert reviews and ratings

By X-bit Labs on

The Ultra X4 ULT-HA850X has a not-very-stable +12V power rail. Its real output power is some 50 watts below the specified one and its compatibility with UPSes is poor. On the other hand, this PSU differs from the competition with its very quiet...

By LanOC Reviews on 70

Ultra didn't include any of the fancy lighting or windows that I have seen in some of their past power supplies. Instead they focused on quality not flashy gimmicks. The modular design was great too work with. However, my only complaint was the...

By ComputerPowerUser on

We tested the Ultra X4 850W on an 8-core Intel Skulltrail rig, complete with multiple drives and a pair of AMDs recently released ATI Radeon HD 5970 cards. Despite peak power consumption...

By TweakNews on

The Ultra Products X4 850W power supply has a lot to recommend it. Its fully modular design is very unique and will be a boon to users with tight cases who like to have neat, tidy installs. The cable assortment is complete and provides the user with...

By Hardware Canucks on

As prices for quality power supplies fall, products that were once out of reach are now accessible to consumers who are on a budget. With the ever-increasing power demands of the most modern components, 850W PSUs have become one of the sweet spots...

By BCCHardware on

The Ultra Products X4 850W PSU is a solid piece of kit in a nice tidy package. This PSU comes equipped with one large 60A +12v rail and supports 6 PCIe devices - 3x 6-pin and 3x 8-pin. It is completely modular and features a nice large fan that...

By Club Overclocker on 80

With the X4 850 W power supply, Ultra has raised the bar for mid range power supplies. The X4 is loaded with features you usually find in much more expensive units and often over the 1000W mark while keeping the price from climbing to far out of a...

By 3dGameMan on

Like the popular Ultra X3 modular line of power supplies, the X4 line will is use to please. With wattage's ranging from 500 to 1600, you are sure to get the PSU that best suits your needs. These PSUs are 100% modular, come...

By Pro-Clockers on

The Ultra X4 600 and 850 units are very good looking power supplies. You can never go wrong with a modular power supply. The arrangement makes for better air flow within the case and allows for better cable management. When comes to the modular cables...

By Bigbruin on

While the unit did not survive the review, I won't hold that against it. As the new test setup gets refined the mortality rate will hopefully drop, while the useful information provided in these reviews will hopefully rise. Before its death, the...

By TechwareLabs on

Packaging: The package that the power supply came in was very clearly labeled with what the device was, the specification, and its features. The power supply and contents were all encased with a thick layer of foam to help prevent damage from...

By Overclockers Online on

As it turns out, Ultra has been keeping busy despite their absence from the power supply scene. If the X4s showing today is any indicator, Ultra still knows how to put together an amazing power supply. Ultras new X4 is quite an attractive package....

By Hardware Secrets on

Ultra X4 850 W is a honest power supply, being able to really deliver 850 W at 48 C. The main advantage of this unit is having six separated video card power cables, allowing you to build an SLI/CrossFire system with up to three high-end video...

International Review By Clube do Hardware on

A Ultra X4 850 W uma fonte de alimentao honesta, realmente capaz de fornecer 850 W a 48?dm; C. A principal vantagem desta fonte so os seis cabos de alimentao para placas de vdeo, permitindo configurar um...