Unboxing GIGABYTE UD850GM PG5 Version 2.0 Power Supply / Conventional Upgrade to Native 12VHPWR PSU


The updated “UD850GM PG5 rev 2.0” power supply from GIGABYTE primarily features the ATX 12V v3.0 specification, along with a native PCIe 16-pin 12VHPWR cable. Retaining a compact 14cm form factor, it boasts an all-black flat modular cable and a primary Japanese capacitor design. This allows users with standard ATX cases to choose between installing high-capacity power supplies like the 80 Plus Gold UD850GM and UD1000GM.

Specifications Intel Form Factor ATX 12V v3.0
PFC: Active PFC (>0.9 typical)
Input voltage: 100-240 Vac (full range)
Input current: 12-6A
Input frequency: 60-50 Hz
Output wattage: 850W
Fan: 120mm Hydraulic Bearing(HYB)fan
80 PLUS: Gold
Efficiency: 90% at typical load
MTBF: >100,000 hours
Power Good Signal: 100-150ms
Hold Up Time: >16ms
Size : 150 x 140 x 86 mm

All black module flat cable
1 piece 1 x ATX/MB 20+4 Pin 610mm
1 piece 2 x CPU/EPS 4+4 Pin 600mm+200mm
1 piece 1 x PCIe 5.0 16 Pin 700mm
2 x PCIe 6+2 Pin 600mm+150mm
2 x SATA 600mm+150mm+150mm+150mm
1 x 3 x Large 4 Pin + 4-Pin floppy 500mm+120mm+120mm+150mm

GIGABYTE UD850GM PG5 rev 2.0 Out of the box / small size, modular, ATX 3.0, PCIe 5.0 graphics cards support

The first generation UD850GM PG5 power supply was introduced alongside the RTX 3090 Ti, and the updated model is clearly marked as UD850GM PG5 rev 2.0 for easy identification by users. This new version primarily upgrades to the Intel Form Factor ATX 12V v3.0 specification, capable of handling 3 times the GPU’s instantaneous overload output and 2 times the overall power’s instantaneous overload, satisfying the high-wattage power supply demands of top-tier CPUs and GPUs.

The UD850GM PG5 rev 2.0 holds an 80 Plus Gold certification, boasting a conversion efficiency of over 90%. It continues to feature high-quality Japanese capacitors and an improved heat dissipation design. The power supply is equipped with a 120mm HYB cooling fan that automatically stops when system power usage is below 170W. Even under full load, the maximum fan noise remains at approximately 35dB.

GIGABYTE UD850GM PG5 rev 2.0 outer box is marked with ATX 3.0.

The rear side of the packaging prominently displays important details such as power conversion efficiency, the fan’s wattage noise curve, and the count and length of connectors for the all-black modular flat cable. Naturally, it also features the comprehensive specifications table for the power supply.

Details on the back of the box.
Power supply, module cable and power cable.

The UD850GM PG5 rev 2.0 features a compact design with dimensions of just 150 x 140 x 86 mm, making it compatible with all ATX cases. It comes with a matte black metal enclosure and is fitted with a 120mm hydraulic bearing fan. The fan automatically stops when the output wattage falls below 170W, reducing noise, and its speed curve adjusts automatically as the load increases.

UD850GM PG5 rev 2.0.

The modular connector of the power supply offers various connection ports, including M/B, 3 sets of CPU/PCI-E, 3 sets of peripheral SATA, and 1 set of 12VHPWR.

Modular Connector.
Power mains input and switch.

The power meter indicates that the UD850GM PG5 rev 2.0 can deliver a maximum wattage of 850W at +12V and +12VHPWR. The maximum current for +12V is 70.8A, while the maximum current for +12VHPWR is 55A. This is sufficient to power the RTX 40 series flagship graphics cards.

Power meter.

The power supply employs an all-black modular flat cable, with the exception of the PCIe 16-pin 12VHPWR cable, which is encased in a braided sleeve. The modular cables provided include: 1 x ATX 24-pin, 1 x CPU 8-pin, 1 x PCIe 5.0 16-pin, 2 x PCIe 6+2-pin, 2 x SATA, 1 x large 4-pin, and other power cables.

Power module cable.
Motherboard ATX 24pin.

The UD850GM PG5 rev 2.0 includes a single CPU power cable, but it features two CPU/EPS 4+4 pin connectors with lengths of 600mm and 200mm, respectively.

CPU/EPS 4+4 pin connector.

The PCIe 16-pin 12VHPWR modular cable features a main 12-pin connector, which is divided into 6 +12V and 6 ground pins, as well as an additional 4-pin signal connector with CARD_PWR_STABLE, CARD_CBL_PRES, SENSE0, and SENSE1 pins. The SENSE signal pins enable the connector to deliver up to 600W of power.

When installing the PCIe 16-pin 12VHPWR power cable, it’s essential to ensure that there is an unbent length of approximately 3cm behind the connector and that the connector is fully inserted into the socket to guarantee the safety of the power supply.

PCIe 16-pin 12VHPWR module cable.
When connecting, make sure that the connector is completely inserted into the socket, and reserve a certain length of the wire so that it does not bend excessively.

The standard PCIe 6+2 pin cable features 2 and 4 connectors, with lengths of 600mm and 150mm, respectively.

PCIe 6+2 pin module cable.

Regarding peripheral power supply, it includes 2 cables with 8 SATA connectors and 1 cable with 3 large 4-pin and 4-pin floppy connectors.

SATA piercing connector.
Big 4 Pin connector.

UD850GM PG5 rev 2.0 and RTX 4080 GAMING OC burn-in, stress test

For testing, the OCCT stress testing software is used to conduct dual load tests on the CPU and GPU. The voltage status of +12V, +5V, and +3.3V, as reported by the motherboard through the software, is examined. Additionally, the NVIDIA PACT tool is utilized to test GPU power consumption and current fluctuations.

The hardware employed in the test consists of an Intel Core i9-13900K processor, a GIGABYTE Z790 AORUS ELITE motherboard, and a GeForce RTX 4080 16GB GAMING OC graphics card.

Test Platform
Processor: Intel Core i9-13900K
Memory: KLEVV DDR5-5600 UDIMM 16GBx2
Display Card: GIGABYTE GeForce RTX 4080 16GB GAMING OC
System Disk: Solidigm P41 Plus 1TB PCIe 4.0 SSD
Radiator: 360mm AIO water-cooled
Power supply: UD850GM PG5 rev 2.0
Operating system: Windows 11 Pro 22H2

During the stress test of the CPU and GPU using OCCT, the total wattage of the computer reached approximately 846.7W. The motherboard voltage information monitored by OCCT revealed that the +12V levels were stably maintained between 12.024V and 12.096V. As for the +5V and +3.3V levels, they also met the stable high-wattage requirements necessary for the high-end i9-13900K and RTX 4080 under dual load conditions.

OCCT Power Test 1H.
HWINFO motherboard sensor values.
The maximum power consumption of the computer is 846.7W for double burning.

Using the NVIDIA PACT tool, the first set of 12V1 voltage measured 11.990V / 0.940A / 11.271W during standby, with the PCIe slot of the graphics card consuming only 3.4W.

While running “Cyberpunk 2077” at 4K resolution, with ray tracing set to ultra and DLSS 3 quality settings, the GPU’s average power consumption was approximately 282W, with an instantaneous maximum of 350.3W. During this test, the 12V1 line reached a current of 18.615A.

Lastly, when conducting the Furmark Xtreme burn-in test, the GPU achieved an average power consumption of 326.7W and an instantaneous peak of 354W. The 12V1 line’s power consumption was measured at 11.915V, 26A, and 310.2W.

12V1 power consumption in standby.
“Dian Yu Ren Ke 2077” GPU power consumption.
Furmark Xtreme burn-in GPU power consumption.


The GIGABYTE UD850GM PG5 rev 2.0 power supply, updated to the ATX 12V v3.0 specification, is capable of meeting the instantaneous overload power demands of flagship CPUs and GPUs. It also provides the 16-pin 12VHPWR connector required by PCIe 5.0 graphics cards, catering to the power supply requirements of high-end RTX 40 series GPUs. This makes installation easier for users, while the power supply still maintains 2 sets of PCIe 6+2 pin cables, ensuring compatibility with standard graphics cards as well.

The UD850GM PG5 rev 2.0 boasts an 80 PLUS Gold certification and is priced at $4590 in Taiwan. With a power supply body measuring just 14cm in length, it is compatible with most ATX cases, allowing mid-tower cases to accommodate the latest ATX 3.0, PCIe 5.0 12VHPWR specifications, and providing the option for an 850W high-wattage power supply.

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Title: Unboxing GIGABYTE UD850GM PG5 Version 2.0 Power Supply / Conventional Upgrade to Native 12VHPWR PSU