Quick Look: Gigabyte UD850GM PG5 V2 850W Power Supply

With NVIDIA’s RTX 40 series we’ve seen more and more graphics cards not only become more powerful, but also use the new 12VHPWR connector. This new connection can actually bring with it 600W through a single cable, which is pretty crazy. With all of this we’ve seen a new standard set (ATX 3.0) for power supply design that brings with it a lot of new features. Today we are taking a quick look at a new ATX 3.0 power supply from Gigabyte, their UD850GM PG5 V2. This 850W power supply features an 80PLUS Gold certification, Japanese capacitors, a fully modular design, and of course support for PCIe Gen 5.0 graphics cards.

Special thanks to Gigabyte for providing us with the UD850GM PG5 V2 850W Power Supply to take a look at.

Current Price: Check on Amazon!


Ultra Durable
– Main Japanese capacitors
– Enhanced thermal solution
– 120mm smart hydraulic bearing (HYB) fan
– OVP/OPP/SCP/UVP/OCP/OTP protection
Support PCIe Gen 5.0 graphics cards
Support Intel ATX 3.0 standard
80 PLUS Gold certified
Fully modular design
Compact design
5 years warranty (Adjusted according to different regions)

ATX 3.0 Standard

This power supply is an ATX 3.0 unit, just not any other 850W unit. To help you better understand here are some of the changes that the ATX 3.0 standard brings with it.

  • Electrical Performance and Improved Compatibility
    • Increased tolerance for high power spikes, reaching up to 200% of the PSU’s rated power for 100 μs with Intel’s custom set duty cycle.
    • There are some changes in low load efficiency. Above 60% is required for 10W or 2% of max-rated capacity, and above 70% is a recommendation now instead of a requirement.
    • The power supply communicates with the graphics card about its power capabilities through sideband signals.
    • Increased slew rates for transient loads (2.5 – 5x times higher for the +12V rail. They remain the same for the other rails)
    • It is the first time the 12V rail can go up to 12.2V to allow for lower voltage drops with transient loads.
    • Wider load regulation limits for the +12V rail (+5 to -8% on the PCIe connectors and +5 to -7% for the other connectors).
    • There are some changes in the speed of the Power On signal to allow for faster response and the system’s wake-up, even when the rails are not at zero levels but somewhere in between.
    • Efficiency and design requirements for Alternative Low Power Modes (ALPM), previously called Alternative Sleep Modes. One of them sets some limits to the standby rail’s efficiency.
    • The labels on the PSUs should include T1 and T3 timings, among others. The role of these timing signals has been upgraded.
    • Power supplies should be able to cycle on & off 175,200 times per year of their life without breaking.
  • 12VHPWR (12+4 Pin) Connector
    • A new 12VHPWR connector / cable for PCIe cards and peripherals that can deliver up to 600 W.
    • The 12VHPWR should have a label printed on it showing the maximum power it can deliver.
    • All power supplies with more than 450W max power should have a 12VHPWR connector.


The UD850GM PG5 V2 comes in a nice retail box. On the front we have a picture of the unit, it lets us know the wattage, and some of the main features are listed. We do have the 850GM unit so we have 850 watts here. As far as the “PG5 V2” versions of the power supply go it is currently only available in 850W and 1000W versions.

Gigabyte UD850GM PG5 V2 850W Power Supply

Flipping the box over to the back we have a full list of specifications, information on the noise and efficiency, and a run-down of the connectors that you will get.

Gigabyte UD850GM PG5 V2 850W Power Supply

Getting everything out of the box we of course have the unit as well as all of our cables and accessories. This is a modular unit so all of your cables will need to be connected to the unit. When it comes to included cables you have a single 24pin (20+4) ATX power connector, a single 16-pin 12VHPWR connector, two 8-pin (4+4) EPS connectors, four 8-pin (6+2) PCI-Express connectors, eight SATA connectors, three 4-pin Molex connectors, and a single floppy connector. You’ll also get a power cable, mounting screws, and a user’s guide.

Gigabyte UD850GM PG5 V2 850W Power Supply

Gigabyte UD850GM PG5 V2 Overview

Having modular cables means that you only use the cables that you need, this will cut down on cable mess inside your case. Most of the modular cables have a flat design, which is pretty common when it comes to modular units. The 12VHPWR cable have a sleeved design. The cable is also labeled to let you know how much power can run through it. Making use of this cable the UD850GM PG5 V2 can sustain up to 3x GPU power excursion.

Gigabyte UD850GM PG5 V2 850W Power Supply

Taking a look at the unit itself it is not all that large. It has official dimensions of 150 x 140 x 86 mm. Being this small it should have no problem fitting in all cases that support ATX power supplies. The sides of the unit have a simple design that lets you do know you have the 850W unit. This will show if you have a case that does have a window in it.

Gigabyte UD850GM PG5 V2 850W Power Supply

The top of the unit has all of our information on it. As a reminder this unit conforms to the ATX 3.0 standard which supports up to 200% power excursion, reaches 70% low load efficiency and complies with required power supply timing standards. On the bottom of the unit is our cooling fan, which is a 120mm smart hydraulic bearing fan. The fan speed is adjusted according to the automatic power detection and stops when the system is idle or under low load (less than 20% load).

Gigabyte UD850GM PG5 V2 850W Power Supply Gigabyte UD850GM PG5 V2 850W Power Supply

Besides the fan, Gigabyte has enlarged the internal heatsinks of the unit by about 200%. This has improved the thermal performance and heat dissipation which will prolong the service life of the components. Talking about components Gigabyte is making use of high quality Japanese capacitors, which have a 4x longer lifespan than conventional capacitors. On one end of the unit you’ll find all of your modular connectors, which are labeled. Finally on the opposite end you have honeycomb ventilation, your power connection, and a physical power button.

Who is the Gigabyte UD850GM PG5 V2 For?

If you are going to be building a new system or even upgrading your system with a new NVIDIA RTX 40 series graphics card the Gigabyte UD850GM PG5 V2 is going to be a solid choice for a power supply. It follows the ATX 3.0 standard so you know your components are going to be safe. It has a dedicated 12VHPWR power cable so you don’t have to deal with adapters or anything like that. We can’t forget the fully modular design, 80PLUS gold certification, and Japanese capacitors.

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