Gaming PC

The Gigabyte UD1000GM PG5 1000W PSU Review: Prelude to ATX 3.0

GIGABYTE is a well-known company with a wide range of motherboards and graphics cards, and countless of them have passed the test lab. Anyway, the huge amount of GIGABYTE producing motherboards and graphics cards has been diversified by GIGABYTE for almost every segment of the PC market, from laptops and mini PCs to gaming keyboards and chairs. It doesn’t prevent you from doing it.

GIGABYTE is not a stranger in the power and cooling business, but shyly sells the first few PCPSUs over 15 years ago. The company’s PSU was rarely released, and GIGABYTE gained a small portion of its market share, but made no significant effort to win the competition.

Today’s review introduces the GIGABYTE UD1000GMPG5, a powerful 80Plus Gold certified PCPSU. What sets the UD1000GM PG5 apart from the crowd is the new 12 + 4-pin connector (12VHPWR connector) required by the ATX3.0 standard. GIGABYTE does not claim that the UD1000GMPG5 is ATX3.0 compliant, but the 12VHPWR connector allows for partial compatibility and will make the PSU future for future graphics card releases. It will be available.

Power specifications (rated @ 50 ° C)
AC input 100-240 VAC, 50-60 Hz
rail + 3.3V + 5V + 12V + 5Vsb -12V
Maximum output 25A 25A 83.3A 3A 0.3A
125W 1000W 15W 3.6W
total 1000W

Packaging and bundling

GIGABYTE offers the UD1000GM PG5 in a visually appealing but relatively small cardboard box, suggesting the compact dimensions of the PSU for output. Inside the box, the PSU is contained in a thin packaging foam that partially protects it from damage in transit.

Virtually no items are bundled with the UD1000GM PG5, and GIGABYTE sticks to the absolute basics. There are only four common mounting screws and an AC power cable in the package.

The GIGABYTE UD1000GM PG5 1000W PSU has a fully modular design and allows you to disconnect all DC power cables, including the 24-pin ATX connector. Most cables are like bare ribbons, with black wires and black connectors. The only exception is the new PCIe 5.0 cable. It is made of black wire and has a black connector, but is covered with a black sleeve.

Connector type Wired Basic unit
ATX24 pin ―――― 1
EPS 4 + 4 pin ―――― 2
EPS8 pin ―――― ――――
PCI-E 5.0 ―――― 1
PCI-E8 pin ―――― Four
SATA ―――― 8
Molex ―――― 3
Floppy ―――― 1

The new PCIe 5.0 cable is the highlight of this PSU. This connector is required for all PCPSU’s new ATX 3.0 standards with outputs above 450 watts. Of course, the connector alone does not comply with UD1000GM PG5 ATX 3.0. This is because the new standard will bring a number of significant changes to the market. However, it helps extend the life of the UD1000GMPG5.

Physically, these 16-pin connectors aren’t significantly larger than traditional 6 / 8-pin PCIe connectors, but they have 12 pins and four sensing pins. Of the four detection pins, two are required and two are optional. Required pins tell the PCIe card the maximum power that the connector can handle, allowing the card to adjust its power consumption. The preset output isn’t close to 600 watts because it’s difficult to use an adapter with an older PSU because the PSU has no way to signal the card and the cable can’t handle the high currents. The only window for safe use of the adapter is to limit the output of the passive adapter to the minimum allowed by the new standard (150 watts) or require an active adapter with multiple legacy connector inputs. ..

Each of these new 12V HPWR connectors can deliver up to 600 watts. Depending on the capabilities of the PSU, the maximum wattage that the PSU can provide is printed on the connector itself. The UD1000GM PG5 connector states that it is capable of continuous processing of 600 watts. This is the maximum value specified in the ATX3.0 standard.



The GIGABYTE UD1000GM PG5 PSU is extremely compact for a 1kW unit. At just 86mm x 150mm x 140mm (H x W x D), the UD1000GM PG5 is fully compliant with ATX standard dimensional specifications and is compatible with virtually all ATX compliant cases. The steel chassis is sprayed with satin black paint, some of which is embossed for a futuristic design. The fan finger guard is also part of the chassis itself.

GIGABYTE has moved a sticker with unit certification and specifications to the top of the chassis, leaving an artistic design on the sides. The sticker is sideways, and the designer clearly believes that this orientation makes the sticker easier to read from the side panel with windows.

A typical on / off switch is 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 nothing was found there. Most of the front is covered with connectors for modular cables, and GIGABYTE insists that users should only use the cables that come with this PSU.

Internal design

GIGABYTE has outsourced the cooling of the UD1200GM PG5 to Jamicon, a sister company of the well-known Teapo. Taiwanese fan makers are not popular among PSU designers, but their products are considered to be of above average quality. The KF1225H1H120mm fan in the UD1200GMPG5 is a fairly basic model with a rifle bearing engine. This fan feels like a strange choice for a PSU with a 10-year warranty and can trigger many RMA demands over the years that follow.

Both OEM and GIGABYTE UD1200GMPG5 platforms are brand new. GIGABYTE has outsourced the manufacture of this PSU to Chinese OEM Xiamen Metrotec Electronic Industry Co (or MEIC). Founded in 2007, MEIC is not a new company, but has been primarily active in manufacturing small products such as chargers and power banks.

The filtering stage of the GIGABYTE UD1200GM PG5 is a textbook, with a total of four Y capacitors, two X capacitors, and two filtering inductors connected to a dual input rectifying bridge configuration. The bridge is located on a fairly large heatsink. The passive APFC component is a huge 400V / 1000μF APFC capacitor made by Nippon Chemi-Con and a filtering coil with a large capacity as well. The inrush current in this configuration can be terrible and the circuit breaker can trip if a Type B MCB or a low rated MCB is used. The active APFC component is on a long heatsink that crosses the edge of the PCB.

Two transistors form a typical half-bridge inversion topology on the primary side of the unit, and six MOSFETs generate a 12V line on the secondary side of the transformer. 3.3V and 5V lines are generated via a DC-DC converter circuit. This is a very common configuration for 80Plus Gold certified units. All secondary capacitors, electrolytic and polymer capacitors, are both provided by Taiwanese manufacturers Teapo and Lelon. Teapo is a manufacturer that often sees mid-tier products. Lelon is not as well known as Teapo, but their products are of about the same quality. Anyway, enthusiasts will probably want to find something better within a high-rise PSU with such a long-term warranty.

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