Gigabyte UD1000GM PG5 1000W Power Supply Review: Prelude to ATX 3.0

GIGABYTE is well known for its wide range of motherboards and graphics cards, thousands of which have passed through our testing labs. Regardless, the massive volumes at which GIGABYTE is producing motherboards and graphics cards hasn’t stopped the company from making diversification efforts into virtually every segment of the PC market, from laptops and mini PCs to gaming keyboards and chairs.

GIGABYTE is no stranger to the power and cooling business, coyly marketing its first PC power supplies over fifteen years ago. The company’s power supply releases were few and far between, with GIGABYTE grabbing a small chunk of market share but never making a significant effort to overwhelm the competition.

In today’s review, we take a look at the GIGABYTE UD1000GM PG5, a powerful 80Plus Gold certified PC power supply. What makes the UD1000GM PG5 stand out from the crowd is the new 12+4 pin connector (12VHPWR connector), which is required by the ATX 3.0 standard. GIGABYTE does not claim that the UD1000GM PG5 supports ATX 3.0, but having the 12VHPWR connector allows partial compatibility and possibly future-proofs the power supply in the face of upcoming graphics card releases.

Power Specifications (rated at 50°C)
AC IN 100 – 240 VAC, 50 – 60 Hz
LANE +3.3V +5V +12V +5Vsb -12V
MAX OUTPUT 25A 25A 83.3A 3A 0.3A
125W 1000W 15W 3.6W
TOTAL 1000W

Packaging and Package

GIGABYTE supplies the UD1000GM PG5 in an aesthetically appealing yet relatively small cardboard box, suggesting the PSU’s compact dimensions in relation to its power output. Inside the box, the power supply is encased in a thin packing foam that offers partial protection against shipping damage.

There are virtually no items included with the UD1000GM PG5, and GIGABYTE sticks to the absolute basics. Only four typical mounting screws and an AC power cord can be found inside the package.

The GIGABYTE UD1000GM PG5 1000W Power Supply has a fully modular design that allows all DC power cables to be removed, including the 24-pin ATX connector. Most cables are bare, ribbon-like, with black strands and black connectors. The only exception is the new PCIe 5.0 cable which is made of black wires and has black connectors, but also has a black jacket covering it.

GIGABYTE UD1000GM PG5
connector type cabling Modular
24 pin ATX 1
EPS 4+4 pins two
EPS 8 pin
PCI-E 5.0 1
PCI-E 8 pin 4
sata 8
Molex 3
Flexible 1

The new PCIe 5.0 cable is the highlight of this power supply. This connector is required by the new ATX 3.0 standard for any PC PSU that outputs more than 450 Watts. Of course, the connector alone does not make the UD1000GM PG5 ATX 3.0 compatible, as the new standard brings numerous significant changes to the market. However, it would help the UD1000GM PG5 last longer.

Physically, these 16-pin connectors are not significantly larger than legacy 6/8-pin PCIe connectors, but they do feature twelve pins plus four sense pins. Of the four sensor pins, two are required and two are optional. The required pins tell the PCIe card the maximum power the connector can handle, allowing the card to regulate its power consumption. That makes using adapters in older PSUs tricky as there is no way for the PSU to send a signal to the card and its cables can’t handle high current draw so the preset output can’t be close to 600 watts. The only window for using adapters safely limits the output of a passive adapter to the minimum allowed by the new standard (150 watts) or it will require active adapters with multiple legacy connector inputs.

These new 12VHPWR connectors can deliver up to 600 watts each. Depending on the capacity of the power supply, the maximum power it can provide is printed on the connector itself. The UD1000GM PG5 connector states that it can handle 600 Watts continuous, which is the maximum dictated by the ATX 3.0 standard.

GIGABYTE UD1000GM PG5 1000W Power Supply

External appearance

The GIGABYTE UD1000GM PG5 power supply is very compact for a 1kW unit. At just 86mm × 150mm × 140mm (height × width × depth), the UD1000GM PG5 manages to fully meet standard ATX dimensional specifications, making it compatible with virtually any ATX-compatible case. The steel chassis is sprayed with satin black paint and various parts of it have been embossed to create a futuristic design. The fan finger guard is also part of the chassis itself.

GIGABYTE moved the decal with the drive’s certifications and specifications to the top of the chassis, leaving the sides to feature an artistic design. The label is facing sideways, and the designer clearly thought this orientation would make it easier to read from a windowed side panel.

A typical on/off switch can be seen on the back of the unit, next to the power connector. There is evidence that there was (or should have been) a sticker just below the power connector, but we found nothing there. Most of the front is covered by the modular cable connectors, and GIGABYTE insists that users should only use the cables provided for this power supply.

Internal Design

GIGABYTE entrusted the cooling of the UD1200GM PG5 to Jamicon, a sister company of the better known Teapo. The Taiwanese fan maker isn’t popular with power supply designers, but its products are considered to be of above-average quality. The KF1225H1H 120mm fan found inside the UD1200GM PG5 is a fairly basic model, with a rifle bearing motor. This fan feels like an odd choice for a power supply with a 10-year warranty and can lead to a lot of RMA requests after so many years.

Both the OEM and platform of the GIGABYTE UD1200GM PG5 are completely new to us. GIGABYTE entrusted the manufacturing of this PSU to Xiamen Metrotec Electronic Industry Co (or MEIC), a Chinese OEM whose products we haven’t seen before. Having been around since 2007, MEIC is not a new company, but has been mainly active in the production of smaller products such as chargers and power banks.

The filter stage of the GIGABYTE UD1200GM PG5 is textbook, with a total of four Y capacitors, two X capacitors and two filter inductors leading to a dual input bridge rectifier configuration. The jumpers are placed on a sizable heat sink. The passive APFC components are a colossal 400V/1000μF APFC capacitor made by Nippon Chemi-Con and an equally massive filter coil. The inrush current of this configuration will be horrendous and can cause the circuit breaker to trip if type B MCBs or low power MCBs are used. The active APFC components are on a long heat sink right at the edge of the PCB.

Two transistors form a typical half-bridge inverting topology on the primary side of the unit, while six MOSFETs generate the 12V line on the secondary side of the transformer. The 3.3V and 5V lines are generated through the DC to DC conversion circuitry. This is a very typical setup for an 80Plus Gold certified unit. All secondary capacitors, both electrolytic and polymeric, are provided by Teapo and Lelon, both Taiwanese manufacturers. Teapo is a manufacturer that we frequently see mid-tier products from. Lelon is not as well known as Teapo but its products are of the same quality. Regardless, enthusiasts would probably expect to find better inside a high-end power supply with such a long warranty.

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