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

Name: Gigabyte UD1000GM PG5 1000 W
Brand: GIGABYTE
Price: 160 USD

crmaris

on May 13th, 2022,

in Power Supplies.

Manufacturer: GIGABYTE

Voltage Regulation Stability & Ripple »

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 Type	Double-sided
Primary Side
Transient Filter	4x 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 Protection	NTC thermistor (NTC-5D15) (5 ohm) & relay
APFC MOSFETs	2x NCE Power NCE65TF099 (650 V, 24 A @ 100 °C, Rds (on): 0.109 ohm)
APFC Boost Diode	1x 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 Switchers	2x NCE Power NCE65TF099 (650 V, 24 A @ 100°C, Rds (on): 0.109 ohm)
APFC Controller	Champion CM6500UNX
Switching Controller	Champion CM6901X
Topology	Primary Side: APFC, half-bridge & LLC converter Secondary Side: synchronous rectification & DC-DC converters
Secondary Side
+12 V MOSFETs	6x Nexperia PSMN1R4-40YLD (40 V, 214 A @ 100 °C, Rds (on): 1.4 mOhm)
+5 V & +3.3 V	DC-DC converters
Filtering Capacitors	Electrolytic: 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 IC	Weltrend WT7502R (OVP, UVP, SCP, and PG)
Fan Model	Jamicon 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 Controller	PR8109T
-12V Circuit
Controller	Axelite 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.