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::>Power supplies > 2014 > 04 > Seasonic G-750 (SSR-750RM)

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26-04-2014


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Seasonic G-750 Power Supply review and testing

The most attractive device of Seasonic line is a product with index “G”. According capabilities and quality it holds the leading positions in comparison with Seasonic X but at the same time the price is reduced. Till recently Seasonic G line included only four models: Seasonic G-360 / G-450 / G-550 / G-650. They perfectly suit for PC with different performance and one graphics card but for gaming configurations with two graphics adapters its capacity won’t be enough. That’s why the appearance of more efficient PPSU in Seasonic G line was forthcoming event. The product got the name Seasonic G-750 but in computer stores it can have a code Seasonic SSR-750RM.

Seasonic G-750 (Seasonic SSR-750RM)

The specs:

Producer

Sea Sonic Electronics

Model

Seasonic G-750

(SSR-750RM)

Type

ATX12V / EPS12V

Nominal capacity, W

750

12V power, W

744

+3,3V & +5V combined, W

100

Number of +12V lines

1

Outputs, А

+3,3V

20

+5V

20

+12V

62

-12V

0,3

+5VSB (stand-by power supply line)

2,5

PCIe

6 (6+2-pin)

SLI Ready

Yes

CrossFire Certified

Yes

Modular

Yes

Efficiency, %

88 - 92

80 PLUS Certified

Gold

Power factor, %

Up to 99

Method of Power Factor balancing

Active

Input voltage, V

100 - 240

Frequency, Hz

50 - 60

Input current, А

10 - 5

Fan size, mm

120 х 120 х 25

Fan speed controller

Yes (S2FC)

Noise level, dB

Up to 39,1

EMI/EMC

CB, CCC, TUV, GOST-R, BSMI, CE, FCC, C-tick

Protection

OVP, UVP, OPP, SCP, OCP, OTP

Compliance of RoHS (low content in the solder of lead and cadmium)

Yes

Dimensions, mm

160 х 150 х 86

Packaging

Power supply in a bag, modular cables, mounting screws with Seasonic case badge, some zip ties, the power cord, the user manual, and company logo sticker.

Warranty, year

5

Website

Sea Sonic Electronics

Packing, bundle and design

Seasonic G-750 (Seasonic SSR-750RM)

PSU Seasonic G-750 is shipped in cardboard box which provides protection against impact and possible mechanical damages. The standard colors for Seasonic G series are white and black. The face of the box contains the key features: nominal capacity (750W) and energy efficiency class (80 PLUS Gold). Also here is modular cable system and PSU compliance to all requirements of Intel Haswell processors. On the one side you can see one more logo «NVIDIA SLI Ready» that indicates about Multi-GPU technology support.

Seasonic G-750 (Seasonic SSR-750RM)

The reverse side provides the information about key features for this model. First of all pay attention to the usage of modern configuration of reducing converter of DC in low-voltage parts and Japanese capacitors in all joints as well as the presence of modular cable system. PSU Seasonic G-750 has 5 year warranty.

Seasonic G-750 (Seasonic SSR-750RM)

Delivery set is quite rich and includes the most important items:

  • power cable;
  • installation screws;
  • set of modular cables in special bag;
  • some zip ties;
  • company logo sticker;
  • user’s manual.

The set of modular cables is not presented on the photo and we will learn it little bit latter.

Seasonic G-750 (Seasonic SSR-750RM)

According outward design this model is similar to other retail-solutions of Seasonic G series. Even the dimensions of PSU are the same 160 х 150 х 86 mm. The case is made of thick steel and painted by black color. The upper lid instead of usual “grill” you’ll find stamped frame with comb cells. According to producer information this structure is better for airflow.  Also vents are on the front wall along with mains socket and power button.

Seasonic G-750 (Seasonic SSR-750RM)

Seasonic G-750 has so-called half-modular cable system: the cables for main components (motherboard, CPU and graphics card) are led out from power unit and the others are removable. The back panel has six modular sockets: four 6-pin for periphery connection and two 8-pin for additional CPU and/or graphics card supply. 

Seasonic G-750 (Seasonic SSR-750RM)

Seasonic G-750 (Seasonic SSR-750RM)

Removable cables have easy-to-use flat ribbon style. Main 20+4-pin power socket ATX is unassembled. Two connectors of ATX12V: 4+4pin and 8-pin are provided for additional CPU power supply. 

Graphics card power supply is realized via six 6+2-pin sockets, this will allow to connect three high-level graphics adapters without the usage of off-side adapters. This is a good idea for those who build the device with several graphics cards.

Other connectors are enough. And its layout on various length cables will allow you to connect the device inside the computer without problems.

All available socket types as well as cable length are given in the following table:

Socket type

Quantity

Cable length up to socket, cm

Cables led out from PSU

ATX 20+4-pin socket

1

50

ATX12V1 4+4-pin socket

1

50

2xPCIe 6+2-pin sockets

1

60-70

Modular (removed) cables

2xPCIe 6+2-pin sockets

2

57-67

ATX12V2 8-pin socket

1

65

2xPATA sockets

1

30-40

3xPATA sockets

1

40-50-60

4xSATA sockets

2

40-50-60-70

2xSATA soxkets

1

30-40

Adapter from PATA to FDD

1

10

Seasonic G-750 (Seasonic SSR-750RM)

One side wall includes a sticker with technical parameters. +12V channel capacity is 744W that corresponds nominal capacity of the unit. As for many high-quality solutions with high efficiency +12V channel is realized as one line and is not divided for several “virtual”. At the same time it is designed for very high load of 62A. This is very important feature for high-performance systems with several graphics cards.

+3,3V and +5V lines have total power capacity of 100W and each can bear a load of 20A. This value will be enough for modern components.

According energy efficiency Seasonic SSR-750RM corresponds 80 PLUS Gold standard. Let’s remind that power supply units are standardized to 80 PLUS Gold if their efficiency for voltage 230V at loads 20%, 50% and 100% is not lower 88%, 92% and 88% respectively.

Also we want to specify a wide range of input voltages from 100 to 240V that allows to reject from external voltage stabilizer in case of network instability.

Internal device

Seasonic G-750 (Seasonic SSR-750RM)

Disassembling process is quite clear and simple. The only thing you need to do is to unscrew four installation screws out top panel. Pay your attention to the presence of special sticker “Warranty void if removed”.

Seasonic G-750 (Seasonic SSR-750RM)

120mm 7 blade ball bearing fan ADDA AD1212UB-A70GL is used to cool inside components. It has quite high power and airflow values that provides good temperature mode of PSU components during the operation. Detailed specification is given in the following table:

Model

ADDA AD1212HB-A70GL

Bearing type

Rolling bearing

Supply voltage, V

12

Current, А

0,37

Power, W

4,44

Max speed of rotation, rpm

2200

Air flow, CFM

85,2

Noise level, dB

Up to 39,1

Dimensions, mm

120х120х25

There is a special small pellucid plastic plate fixed to fan with the aim to provide airflow optimization inside the power unit.

Seasonic G-750 (Seasonic SSR-750RM)

The base of Seasonic G-750 is well-known LLC platform. Let’s remind that Sea Sonic Electronics Company develops all circuitry and provides quality control for production.

Seasonic G-750 (Seasonic SSR-750RM)

At the input there is a filter smoothing of high-frequency noises provided by power unit. Traditionally it is divided into two parts: one is near clamps of wall outlet and shielded by metal foil and the second is on main circuit board. EMI filter includes all required components (six Y- and two X- capacitors, three coils and a varistor). So there is no any doubt in its operability.

Seasonic G-750 (Seasonic SSR-750RM)

Input rectifier consists of 15A diode blocks GBU1506. They are equipped with aluminum cooler. Next to them you will find big choke of automatic phase and frequency control and its power unit. To cool a pair of transistors and STTH8S06D diode a bigger separate cooler is used.   

Seasonic G-750 (Seasonic SSR-750RM)

There is a high voltage capacitor (470µFx420V) produced by Japanese Company Nippon Chemi-Con and refers to high-temperature class (up to 105°С).

Seasonic G-750 (Seasonic SSR-750RM)

Seasonic SSR-750RM includes half-bridge resonance converter. Unfortunately we could not dissemble the marking of transistors.

Seasonic G-750 (Seasonic SSR-750RM)

Two chips ICE3PCS01 and ICE2HS01G are used as control logic. The first is responsible for correct APFC module operation and the second is PWM-controller of the main converter.

Seasonic G-750 (Seasonic SSR-750RM)

Stand-by power unit (+5Vsb) is based on Infineon ICE2QR4765 chip.

Seasonic G-750 (Seasonic SSR-750RM)

The voltage of main line +12V is realized by synchronous rectifier. The elements of DC-DC-voltage +3,3V and +5V converters are on the daughter circuit board. The right side includes LC-filters of +3,3V and +5V channels and power part is on reverse side under aluminum plate. That’s why we could examine neither marking nor quantity of transistors.

Seasonic G-750 (Seasonic SSR-750RM)

Seasonic G-750 (Seasonic SSR-750RM)

For output voltage filtration the capacitors with solid and liquid electrolyte are used (mainly on +12V line). The producer is well-known Japanese Company United Chemi-Con and the elements refer to high-temperature series (up to 105°С). All this informs about good quality and durability.

Seasonic G-750 (Seasonic SSR-750RM)

According technical specification Seasonic G-750 power supply unit has a number of protections (OVP / UVP / OPP / SCP / OCP / OTP) including overload and overheating protection. The joint is based on popular chip PS223 and realized on separate circuit board.


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