FSP Hydro G PRO 850 W Review 11

FSP Hydro G PRO 850 W Review

Load Regulation, Hold-up Time, Inrush Current, Efficiency & Noise »


We would like to thank FSP for supplying the review sample.

FSP revamped its Hydro G line. The capacities of the four new models range from 650 W to 1000 W, and all of them feature top build quality, are fully modular, and have a ten-year warranty. Such an extended warranty seems to be the standard for high-end PSUs nowadays. With a $150 price tag, the HG2-850 isn't affordable given an additional $10 gets you a Seasonic Focus Plus Gold model of similar capacity. Moreover, the highly popular Corsair RM850x is listed at $130, which creates lots of problems for FSP's offering in this category.

As you can easily figure out based on the above, the HG2-850 is notably more expensive than its competitors. Because of some high-end parts FSP uses in this platform, the manufacturing cost is pretty high, which might not be a concern for users after the best reliability under even harsh conditions. However, most users base their purchases on performance per dollar.

The HG2-850 utilizes a fully modular cable design and has a semi-passive fan operation, which can be deactivated should the user want to install the power supply with its fan grille facing sideways or downwards. On the Cybenetics scale, the unit meets the ETA-A and LAMBDA-S++ standards in efficiency and noise respectively. It is also 80 PLUS Gold certified.


FSP HG2-850 Features & Specifications
Max. DC Output850 W
EfficiencyETA-A & 80 PLUS Gold
Intel C6/C7 Power State Support
Operating Temperature0–40 °C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling120 mm Fluid Dynamic Bearing Fan (MGA12012XF-O25)
Semi-passive Operation✓ (Selectable)
Dimensions150 mm (W) x 85 mm (H) x 150 mm (D)
Weight1.7 kg (3.75 lb)
ComplianceATX12V v2.31, EPS 2.92
Warranty10 years
Price at Time of Review (excl. VAT)$149.99

The fan is of high quality, but small, so it has to spin at high speeds to produce enough airflow, and its profile is aggressive at high operating temperatures, so noise output can be annoyingly high. Finally, at 150 mm deep, dimensions of the HG2-850 are compact.

FSP HG2-850 Power Specifications
Rail3.3 V5 V12 V5 VSB-12 V
Max. Power20 A20 A70.8 A2.5 A0.3 A
120 W850 W12.5 W3.6 W
Total Max. Power850 W

Cables and Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (600 mm)1118-22AWGNo
4+4 pin EPS12V (700 mm)2218AWGNo
6+2 pin PCIe (650 mm+150 mm)1218AWGNo
6+2 pin PCIe (500 mm+150 mm)2418AWGNo
SATA (520 mm+150 mm+150 mm+150 mm)1418AWGNo
SATA (500 mm+150 mm+150 mm+150 mm)1418AWGNo
SATA (500 mm+150 mm) / 4-pin Molex (+150 mm+100 mm)24 / 418AWGNo
SATA (500 mm+150 mm) / 4-pin Molex (+150 mm) / FDD (+150 mm)12 / 1 / 118-22AWGNo
AC Power Cord (1370 mm) - C13 coupler1118AWG-

There are plenty of cables and connectors without any extra filtering caps. This makes the cables less bulky, which can be a strong advantage, especially in cases with a small interior, as well as small cable-routing holes.

I finally come across a PSU with the proper distance between peripheral connectors. Most brands and manufacturers cut corners here to save some money, but FSP left 150 mm clearance between both SATA and 4-pin Molex connectors and deserves high praise for doing so.

Not everything is perfect, though. I noticed an affixed Berg connector that will most likely not be used. It should be provided as an adapter, and FSP should install an additional 4-pin Molex connector instead.

Component Analysis

FSP HG2-850 Parts Description
General Data
Manufacturer (OEM)FSP
PCB TypeDouble Sided
Primary Side
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 2x Gas Discharge Tubes
Bridge Rectifier(s)2x HY GBJ2506 (600 V, 25 A @ 100 °C)
Inrush Current ProtectionNTC Thermistor & Relay
APFC MOSFETs2x Infineon IPA60R180P7(650 V, 11 A @ 100 °C, 0.18 Ohm)
APFC Boost Diode1x STMicroelectronics STPSC6H065 (650 V, 6 A @ 110 °C)
Hold-up Cap(s)1x Nippon Chemi-Con (450 V, 680 uF, 3,000 h @ 105 °C KHS)
Main Switchers2x STMicroelectronics STF28N60M2 (650 V, 14 A @ 100 °C, 0.15 Ohm)
APFC ControllerInfineon ICE2PCS02
Switching ControllerChampion CM6901T2X
TopologyPrimary side: Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V4x Toshiba TPHR8504PL (40 V, 150 A @ 25 °C, 0.85 mOhm)
5V & 3.3VDC-DC Converters: 6x Diodes Incorporated DMN3009SK3 (30 V, 60 A @ 70 °C, 5.5 mOhm)
PWM Controllers: ANPEC APW7159C
Filtering CapacitorsElectrolytics: 5x Nippon Chemi-Con (1 - 5,000 h @ 105 °C, KZE), 1x Rubycon (3 - 6,000 h @ 105°C, YXG), 5x Rubycon (6 - 10,000 h @ 105 °C, ZLH), 2x Rubycon (6 - 10,000 h @ 105 °C, ZLJ)
Polymers: 30x United Chemi-Con
Supervisor ICSITI PS223H (OCP, OTP, OVP, UVP, SCP, PG)
Fan ModelProtechnic Electric MGA12012XF-O25 (120 mm, 12 V, 0.52 A, Fluid Dynamic Fan)
Fan ControllerAPW9010
5VSB Circuit
RectifiersCET CEF04N7G FET (700 V, 4 A @ 25 °C, 3.3 Ohm) & PFC P15L50SP SBR (50 V, 15 A)
Standby PWM Controller-

The platform looks different from the one previous-generation Hydro G units used. No cables block the airflow in this new design, and the distance between components is larger, allowing for better cooling and lower operating temperatures. On the primary side, FSP again uses a half-bridge topology along with an LLC resonant controller.

The APFC converter uses a bulk cap of incredibly high quality and a lifetime of 3,000 hours at 105 °C. Even more expensive PSUs use 2,000 h @ 105 °C bulk caps, so the HG2-850 has an advantage here. The last parts I expect to fail in this unit are the bulk cap and cooling fan.

The caps on the secondary side are exclusively provided by Japanese manufacturers. All belong to good lines, not entry-level ones.

The soldering quality on the business side of the mainboard is good. The +12V FETs are installed on this side, along with several controllers and other interesting ICs.

Several polymer caps at the front of the modular board are used for ripple-filtering purposes.

The DC-DC converters that generate the minor rails.

The Protechnic Electric fan with model number MGA12012XF-O25. It is of high quality, but I would like to see a larger diameter fan to keep noise output lower.
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