Gigabyte UD1000GM PG5 1000 W Review - The First PCIe 5.0 PSU 49

Gigabyte UD1000GM PG5 1000 W Review - The First PCIe 5.0 PSU




Gigabyte had huge problems with its PG-M line, and everything started with our review of the P750GM model. They released revised models after the plethora of complaints from users and reviewers worldwide, but there was no way to tell the difference between the old and new models. To avoid further bad press, Gigabyte re-introduced the newer units as part of the UD line. These use the revised P-GM platform with lower OCP and OPP triggering points, and some minor PCB changes. After the release of the ATX v3.0 specification, which included specifications for PCIe 5.0 PSU compatibility, Gigabyte was the first to release a PSU featuring a 12+4 pin connector, while also claiming ATX v3.0 compatibility because the connector alone doesn't make a PSU ATX v3.0 compatible. As such, Gigabyte upgraded the UD1000GM model to the UD1000GM PG5.

The UD1000GM PG5 uses a fully modular cable design and has compact dimensions for the capacity. Because of the small case, it has to use a 120 mm fan combined with an aggressive fan-speed profile. As such, the PSU is rated Cybenetics Standard+ (35–40 dBA) for noise output—don't expect it to be quiet. Moreover, the unit is rated 80 PLUS Gold and Cybenetics Platinum for efficiency. At the time of review, the price was $160, which is below competing offerings that lack the new PCIe connector.


Gigabyte UD1000GM PG5
Features & Specifications
Max. DC Output1000 W
Efficiency: 80 PLUSGold
Efficiency: Cybenetics 115 V: Platinum (89–91%), 230 V: Platinum (91–93%)
NoiseCybenetics Standard+ (35–40 dBA)
ModularYes (fully)
Intel C6/C7 Power State SupportYes
Operating Temperature0–40 °C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling120 mm rifle bearing fan (KF1225H1H-AA)
Semi-Passive OperationYes
Dimensions (W x H x D)150 x 85 x 140 mm
Weight1.61 kg (3.55 lb)
ComplianceATX12V v3.0, EPS 2.92
Warranty10 years
Price at Time of Review (excl. VAT)$160
Gigabyte UD1000GM PG5
Power Specifications
Rail3.3 V5 V12 V12VHPWR5 VSB-12 V
Max. Power25 A25 A83.3 A553 A0.3 A
125 W1000 W15 W3.6 W
Total Max. Power1000 W


The box is small because of the PSU's compact dimensions. At the face, mention is made of the PCIe Gen 5 compatibility, but Gigabyte forgot to replace the ATX v2.31 mention on the back with ATX v3.0. The unit is listed as ATX v3.0 compatible on the product web page.

Foam spacers surround the PSU, providing good protection.

The bundle only includes the necessary bits and bobs: a user manual, fixing bolts, the modular cables, and the AC power cord.

At the face of the PSU is the power switch and AC receptacle. There is no switch to toggle the semi-passive operation on/off.

The power specifications label is on the bottom of the PSU, which it covers nearly entirely.

Including the 12VHPWR socket, the modular board has nine sockets.

At only 140 mm long, this PSU is compact.

Some more photos of the PSU from various angles.

Cables and Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn-Cable Capacitors
ATX Connector 20+4 pin (610 mm)1118AWGNo
4+4 pin EPS12V (600 mm+200 mm)1218AWGNo
16 pin PCIe 5.0 (700 mm)1116AWGNo
6+2 pin PCIe (600 mm+150 mm)2418AWGNo
SATA (600 mm+150 mm+150 mm+150 mm)2818AWGNo
4-pin Molex (500 mm+115 mm+115 mm) / FDD (+150 mm)13 / 118AWGNo
AC Power Cord (1400 mm) - C13 coupler1116AWG-

Both EPS connectors are on the same cable, so utilizing them fully won't be possible. Each EPS connector should be on its own dedicated cable. Moreover, it would be nice to see three PCIe cables instead of two.

There is no need for an FDD adapter, and the 4-pin Molex connectors should at least be 150 mm apart.

The AC power cord.

Component Analysis

Before reading this page, we strongly suggest looking at this article, which will help you better understand the insides of a PSU.

Gigabyte UD1000GM PG5 Parts Description
General Data
Manufacturer (OEM)MEIC
PCB TypeDouble-sided
Primary Side
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x Chipown PN8200 (Discharge IC)
Bridge Rectifier(s)2x GBU1506 (800 V, 15 A @ 100 °C)
Inrush Current ProtectionNTC thermistor (NTC-5D15) (5 ohm) & relay
APFC MOSFETs2x NCE Power NCE65TF099 (650 V, 24 A @ 100 °C, Rds (on): 0.109 ohm)
APFC Boost Diode1x STMicroelectronics STPSC10H065 (650 V, 10 A @ 135°C)
Bulk Cap(s)1x Nippon Chemi-Con (400 V, 1000 uF, 2,000 h @ 105 °C, KMW)
Main Switchers2x NCE Power NCE65TF099 (650 V, 24 A @ 100°C, Rds (on): 0.109 ohm)
APFC ControllerChampion CM6500UNX
Switching ControllerChampion CM6901X
TopologyPrimary Side: APFC, half-bridge & LLC converter
Secondary Side: synchronous rectification & DC-DC converters
Secondary Side
+12 V MOSFETs6x Nexperia PSMN1R4-40YLD
(40 V, 214 A @ 100 °C, Rds (on): 1.4 mOhm)
+5 V & +3.3 VDC-DC converters
Filtering Capacitors

7x Teapo (3–6,000 h @ 105 °C, SY),
4x Lelon (4–7,000 h @ 105 °C, RXW),
3x Teapo (2,000 h @ 105 °C, SH),
8x Lelon (4–10,000 h @ 105 °C, RZW)
1x Lelon (105°C, RG)

Polymer: Polymer: 14x Teapo

Supervisor ICWeltrend WT7502R (OVP, UVP, SCP, and PG)
Fan ModelJamicon KF1225H1H-AA (120 mm, 12 V, 0.35 A, rifle bearing fan)
5VSB Circuit
Rectifier(s)1x JF Semiconductor SP10U45L SBR (45 V, 10 A)
Standby PWM ControllerPR8109T
-12V Circuit
ControllerAxelite Technology AX3111

The platform looks identical to the UD1000GM for all but the addition of a daughter board hosting the -12 V circuit. Investing money and time into creating a dedicated board for this rail seems odd as -12 V has been optional for some time now. The PCB is small, too small, which poses some limitations. There is no space for two bulk caps, and there is no bypass relay for the NTC thermistor as there is no space to install one. Soldering quality is great, but I cannot say the same of the caps on the secondary side.

The transient filter is complete. There is also an MOV for protection against power surges.

I found a discharge IC in the transient filter; it provides a small efficiency boost.

An NTC thermistor lowers inrush currents. There is no bypass relay to isolate it from the circuit as the PSU operates, which is a great shame since it notably affects inrush current protection.

The two bridge rectifiers can handle up to 30 A.

The APFC converter uses two NCE Power FETs and a single STMicroelectronics boost diode. The bulk cap is by Chemi-Con and among the largest I have seen in desktop PSUs. There was no space to install two in parallel, so they had to go with a single cap, hence the increased capacity.

The APFC controller is a Champion CM6500UNX. To make my life harder than it has to be, MEIC tried its best to erase the marking on all ICs it used for this platform.

The two NCE Power primary switching FETs are installed in a half-bridge topology.

The resonant controller is a Champion CM6901X.

According to Wikipedia, George Ripple was an American social reformer, Unitarian minister, and journalist associated with Transcendentalism. Why they used his name on the main transformer is a mystery to me.

Six Nexperia FETs regulate the +12 V rail. They are installed on the main PCB's business side, and small heatsinks help cool these.

The electrolytic caps on the secondary side are by Teapo and Lelon. I don't have a problem with Teapo caps unless it is SC line caps being used for the main ripple filtering layer. However, I don't trust the Lelon caps. In addition to electrolytic caps, MEIC used several polymer ones.

Two DC-DC converters generate the minor rails.

The standby PWM controller is a PR8109T IC, and the 5VSB secondary rectifier is an SP10U45L SBR.

The supervisor controller is a Weltrend WT7502R.

This is the board responsible for the -12 V rail.

Several polymer and electrolytic caps.

Soldering quality is great.

The fan uses a rifle bearing, so it will last for a while. The problem is the aggressive fan-speed profile driving it.

Test Setup

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