The Gigabyte UD750GM is a decent PSU, but it’s not the best PSU as you can pay $10-$20 more for a top performing Corsair RM750x (2021) and an EVGA SuperNOVA 750 G6.
We’ve already seen a 1000W member of the UD family with a PCIe 12+4 pin connector, but thought we’d also look at the smallest member of the lineup with a maximum power of 750W. The UD750GM was the successor to his P750GM, and its first version had serious reliability issues. Gigabyte released subsequent upgrades of the P750GM and P850GM units. Still, it was not possible to differentiate from the old model, and considering the low penetration rate, the best plan was to introduce a new line “UD” that adopted the P-GM with an upgraded platform.
Gigabyte UD750GM uses a fully modular cable design and is certified Gold by 80 PLUS. On the Cybenetics scale, it achieves Platinum and Standard++ for efficiency and noise respectively. The MEIC platform used is efficient and seems to have solved all reliability issues. A little too late. The 120 mm fan uses a rifle bearing fan instead of the advertised hydrodynamic, and the warranty is long enough at his 5 years.
specification
| Manufacturer (OEM) | MEIC |
| maximum. DC output | 750W |
| efficiency | 80 PLUS Gold, Cybernetics Platinum (89-91%) |
| noise | Cybenetics Standard++ (30-35 dB[A]) |
| base unit | ✓ (completely) |
| Intel C6/C7 power state support | ✓ |
| Operating temperature (continuous full load) | 0 to 40°C |
| Overvoltage protection | ✓ |
| low voltage protection | ✓ |
| over power protection | ✓ |
| Overcurrent (+12V) protection | ✓ |
| Overheat protection | ✓ |
| short circuit protection | ✓ |
| surge protection | ✓ |
| Inrush current protection | ✓ |
| Fan failure protection | ✗ |
| No-load operation | ✓ |
| cooling | 120mm rifle bearing fan (D12SH-12) |
| Semi-passive operation | ✓ |
| size (width x height x depth) | 150×85×140mm |
| weight | 1.42 kg (3.13 lb) |
| form factor | ATX12V v2.31, EPS 2.92 |
| guarantee | 5 years |
Power supply specifications
| rail | 3.3V | 5V | 12V | 5VSB | -12V | |
| maximum.Power | Amplifier | 20 | 20 | 61 | 3 | 0.3 |
| Watt | 105 | 732 | 15 | 3.6 | ||
| total max. Power (W) | 750 |
cables and connectors
| explanation | number of cables | Number of connectors (total) | gauge | with cable capacitor |
|---|---|---|---|---|
| ATX connector 20+4 pin (610mm) | 1 | 1 | 18AWG | No |
| 4+4 pin EPS12V (600mm) | 2 | 2 | 18AWG | No |
| 6+2 pin PCIe (600mm+150mm) | 2 | Four | 18AWG | No |
| SATA (600mm+150mm+150mm+150mm) | 2 | 8 | 18AWG | No |
| 4-pin Molex (500mm+115mm+115mm) / FDD (+150mm) | 1 | 3/1 | 18AWG | No |
| AC power cord (1400mm) – C13 coupler | 1 | 1 | 16AWG | – |
It’s odd that ATX cables are longer than EPS cables, but PSUs include all the connectors to deliver full power without issue. It also eliminates the need for a floppy (FDD) connector. Installed a 4-pin Molex instead, and for users who still need this old connector he can provide an adapter from Molex to his FDD. Finally, 150 mm between 4-pin Molex connectors is a good idea, as is the case with SATA connectors.
Component analysis
I highly recommend taking a look at the PSU 101 article which provides valuable information on PSUs and their operation. You can get a better understanding of the components that we are going to discuss.
| general data | – |
| Manufacturer (OEM) | MEIC |
| Substrate type | both sides |
| primary side | – |
| transient filter | 4x Y Cap, 2x X Cap, 2x CM Choke, 1x MOV, 1x Chipown PN8200 (discharge IC) |
| Inrush protection | NTC thermistor & relay |
| bridge rectifier | |
| APFC MOSFET |
2x NCE Power NCE65TF099F (650V, 24A @ 100°C, Rds(on): 0.109 ohms)
|
| APFC boost diode |
1 x JF SC0665 (650V, 6A @ 175°C)
|
| bulk cap |
1x Nippon Chemi-Con (400V, 680uF, 2,000h @ 105°C, KMW)
|
| main switcher |
2x NCE Power NCE65TF099F (650V, 24A @ 100°C, Rds(on): 0.109 ohms)
|
| APFC controller | |
| resonant controller | champion CM6901X |
| topology |
Primary Side: APFC, Half Bridge & LLC Converter |
| Secondary side | – |
| +12V MOSFETs | no information |
| 5V & 3.3V | DC-DC Converter: 4x Alpha & Omega AON6354 (30V, 52A @ 100°C, Rds(on): 4.4mOhm) PWM Controller: 2x uPI-Semi uP9303B |
| filtering capacitor |
Electrolysis: 10x Lelon (4-7,000h @ 105°C, RXW), 2x Lelon (4-10,000h @ 105°C, RZWMore), 4x Lelon (2-5,000h @ 105°C, RXK) |
| Supervisor IC | Weltrend WT7502R (OVP, UVP, SCP, PG) |
| fan model | Yate Loon D12SH-12 (120 mm, 12V, 0.30A, rifle bearing fan) |
| 5VSB circuit | – |
| rectifier |
1x JF Semiconductor SP10U45L SBR (45V, 10A)
|
| Standby PWM controller | PR8109T |
The platform is provided by MEIC, which entered the desktop PSU design with the P-GM series. MEIC is mainly known for its power adapters. As far as we know, his Gigabyte is the first to use this OEM for a desktop PSU. The design is clean and the heatsink is large enough to handle the heat load. The soldering quality is excellent, but the parts Gigabyte used aren’t the best, especially the cooling fan.
Your transient filter is complete. In addition to a MOV and NTC thermistor and relay combination, I also found a discharge IC to limit the energy loss in the X-cap.
A pair of bridge rectifiers can handle up to 30A in combination.
The APFC converter uses two NCE power FETs and one boost diode. The bulk cap is made by Chemicon.
The main FET is installed in a half-bridge topology. LLC resonant converters are also used to increase efficiency.
I couldn’t identify the 12V FET without desoldering the heatsink. This could damage the heatsink and required the PSU to be fully operational in case retesting was needed in the future.
The filter cap is made by Lelon. On paper, their specs are top-notch, but lesser-known manufacturers are usually skeptical. is also becoming more difficult.
The standby PWM controller is PR8109T IC.
There are some electrolytic and polymer caps on the surface of the modular board.
The main supervisor IC is Weltrend WT7502R.
The soldering quality is excellent.
We don’t like Yate Loon fans. Gigabyte should use a different brand for her one of the most important parts of the PSU: the cooling fan.
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