White-colored theme build hype seems to be picking up again recently and we can see more brands launching white-colored versions of their existing products, which takes us to this – the Gigabyte UD850GM power supply which will be taking a quick look at today.  Gigabyte launched its UD series power supply lineup back in 2022 as one of the first few power supplies that support the RTX 3090 Ti and RTX 40 series graphics cards that use the 12VHPWR connector for those who prefer a tidier cable management.

The UD850GM White Edition we have this time is the second highest rated model after the UD1000GM in the UD series power supply lineup. Our test this time is a simple one, which we will be using on our test system with an Intel Core i9-12900K and an RTX 4090 to see if it can handle our usual testing methodologies.


ModelGP-UD850GM PG5W
TypeIntel Form Factor ATX 12V v3.0
PFCActive PFC (>0.9 typical)
Input Voltage1200-200 Vac (full range)
Input Current12-6A
Input Frequency60-50Hz
Output Capacity850W
Dimension150 x 140 x 86 mm
Fan Type120mm Hydraulic Bearing fan
Efficiency80 PLUS Gold (90% at typical load)
MTBF>100,000 hours
Power Good Signal100-150ms
Hold Up Time>16ms
Cable TypeFlat, All white
  • ATX/MB 20+4 Pin x 1 – 610mm
  • CPU/EPS 4+4 Pin x2 – 600mm + 200mm
  • PCIe 6+2 Pin x 1 – 700mm
  • SATA x 8 – 600mm + 150mm + 150mm + 150mm
  • 4 Pin Peripherals + 4 Pin floppy x 1 – 500mm + 120mm + 120mm + 150mm


  • Gigabyte UD 850W 01

Gigabyte prominently showcases the PCIe Gen5 compliance of this model on the front of the box, which is the 12VHPWR which is present on the RTX 40 series graphics cards. For further details about the product, including cables, connectors, and specifications, you can find information on the back of the box before making your purchase. One thing to take note of is that the UD850GM White Edition is a new revision that is ready with the 12VHPWR connector, unlike the earlier release of the UD850GM.

  • Gigabyte UD 850W 06

The design of the UD850GM White is quite straightforward – devoid of unnecessary RGB lighting and featuring a honeycomb grill design to enhance airflow. On the reverse side of the power supply, you’ll find a label detailing the specifications of the UD850GM. Regarding PCIe power output, you have the option of utilizing either the standard PCIe power connector capable of delivering up to 850W or the +12VHPWR that can deliver up to 660W.

Turning to the available sockets on the power supply unit, it aligns with what is typically seen in fully modular designs, with an additional socket provided for the 16-pin PCIe power, catering to newer graphics cards with 12VHPWR connector.

User Experience

The following list is the components used for the tests we’ve done for those who are interested to know about our test system configuration.

CPUIntel Core i9-12900K
MotherboardASUS ROG Maximus Z690 APEX
MemoryADATA XPG LANCER RGB DDR5@6000MHz CL30 (16GB x2)
Graphics CardNVIDIA GeForce RTX 4090 Founders Edition
Power SupplyGigabyte UD850GM White Edition
Primary StorageKingston KC3000 2TB
CPU CoolerCooler MasterLiquid PL360 Flux
ChassisCooler Master MasterFrame 700
Operating SystemWindows 11 Pro 64-bit 21H2 (Build 22000.1696)

We put the UD850G White through a battery of stress tests, including FurMark, ROG RealBench, Cinebench R23, and Prime95. Each test ran for at least an hour, with the system reaching a maximum power draw of around 716W during the most demanding workloads. Thankfully, the UD850G White performed well with no signs of instability or failure.

We also ran the 3DMark Time Spy Extreme stress test for a full day to further assess its capabilities. The UD850G White handled it without any issues. We even extended the testing duration, and the power supply continued to operate reliably. Temperatures remained moderate, typically ranging between 48-56°C, suggesting ample thermal headroom for demanding tasks.

First Impressions

From the looks, it’s easy to tell that the UD850GM White Edition prioritizes a minimalist design aesthetic, and of course, the all-white color scheme for users who are going for a full white-themed build. The flat cables offer a clean look and can simplify cable management, particularly for users who prioritize a tidy interior. A minor drawback for first-time builders might be the lack of labeling on some cables, which is the same issue we encountered back then when trying out the UD1000GM. Differentiating between a 4+4 pin EPS connector and a 6+2 pin PCIe power connector can be confusing for those without prior knowledge.

Although it manages to handle our test system that is equipped with an Intel Core i9-12900K and GeForce RTX 4090 without any noticeable hiccups, the recorded 716W system power draw during load is under the condition where the two major components, CPU and GPU are running at the default settings. If you’re going to overclock the components for more performance, it is recommended that you upgrade the power supply to something like the UD1000GM at least.


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