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PSU Seasonic Platinum 660: review and testing 

The range of power supply units Seasonic Platium is the flagship in the model number of the company Sea Sonic Electronics. So you can often hear the opinion that the members of this series are exclusively bought for powerful gaming or overclocking systems, as well as in the building of silent PC (it is a fanless solution). However, in practice, the scope of the "platinum" device is much wider and also covers the segment of conventional desktop configurations, including one or two graphics cards. Do note that the only distinctive feature of a new model is the capacity, while the electrical characteristics and consumer qualities remain at the highest level, as we have already seen during testing PSU Seasonic Platinum 760. Now let’s check this assertion to model Seasonic Platinum 660 (Seasonic SS-660XP2).

Seasonic Platinum 660 (Seasonic SS-660XP2)

Like other members of the series Seasonic Platinum, it has recently had a new revision, which primarily has a positive impact on its cost. Thus, the "platinum" devices have become a little more affordable for the average user.

The specs:


Seasonic Platinum 660

(Seasonic SS-660XP2)



Rated capacity, W


12V channel capacity, W


+3,3V and +5V channel capacity, W


Q-ty of +12V lines


Outputs, А









+5VSB (stand-by power line)



4 (6+2-pin)



Efficiency, %

> 91

Certified 80 PLUS


Power factor, %


Method of Power Factor balancing


Input voltage, V

100 − 240

Frequency, Hz

50 − 60

Input current, А

4 − 8,5

Fan dimensions, mm

120 х 120 х 25

Fan speed controller

Yes (Seasonic S3FC: hybrid cooling system)

Noise level, dB

Up to 30,0

Support for energy saving states C6 / C7(Intel Haswell Ready)


Correspondence to environmental standards, electromagnetic safety and compatibility (EMI/EMC)

CB, CCC, TUV, cTUVus, GOST-R, BSMI, CE, FCC, RCM, RoHS, WEEE, ErP Lot 6 2013



Dimension, mm

160 х 150 х 86


Power cord, fastening screws, modular cables and bag, cable holders, straps with adhesive tape, manual, sticker and bag with company logo


Warranty, years


Producer website


Product page

Seasonic Platinum 660 

Package and content 

Seasonic Platinum 660 (Seasonic SS-660XP2)

Power supply Seasonic Platinum 660 comes in a colorful box, decorated in colors of series Seasonic Platinum. Traditionally, the packaging has a good aspect. Here there is the necessary information concerning about the electrical characteristics of the device, applied technologies, as well as the implementation of the system of power cables.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Most of all we are interested in the back side of the box, which lists the main features of the model Seasonic SS-660XP2:

  • 80 PLUS Platinum - a very high level of energy efficiency compliant with 80 PLUS Platinum;
  • DC to DC Converter Design – there is an advanced circuitry with a strong line +12V output, which basis remaining denominations;
  • Seasonic Patented DC Connector Panel with Integrated Voltage Regulation Module - patented design of module with inverters DC-DC, which can reduce the energy loss in the low-voltage side, to improve the quality of installation and cooling elements, as well as to simplify the structure of the entire assembly;
  • Tight Voltage Regulation [±2%] - high stability of output voltages (deviations from the nominal line shall not exceed ±2%, while the standard ATX12V allowed values in the range of ± 5%);
  • Seasonic Hybrid Silent Fan Control S2FC & S3FC - the presence of a hybrid cooling system, thanks to which the fan doesn’t rotate at low loads;
  • Sanyo Denki San Ace Silent Fan - the use of high-quality fans based on ball bearings;
  • Highly Reliable 105°C Aluminum Electrolytic Capacitors, Conductive Polymer Aluminum Solid Capacitors - all nodes have high-quality Japanese capacitors belonging to the high-temperature series;
  • High Current Gold Plated Terminals - all connectors are gold plated;
  • Multi-GPU Technology Support - presence of 6+2-pin PCIe connectors for additional power connection to the graphics card of any level simplifies the multi-graphics configurations creation;
  • 7 Years Warranty - 7 years warranty.

Those are not all the achievements of the company Sea Sonic Electronics, which are reflected in the model. Although they are sufficient to understand that we are dealing with a representative of the flagship line of the entire range of products under the brand Seasonic.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Supplied set of Seasonic Platinum 660 also is consistent with the status of top-end solutions. In addition to standard components in the box we found additional clamps and reusable ties with adhesive type, which will be useful for accurate placement of cables in the computer base. To store the cables there is a special two-piece bag. For the same purpose you can use the bag with the company’s logo. The delivery set is the following:

  • AC power cord;
  • screws to secure;
  • modular cables;
  • clamps and reusable ties with adhesive type to secure the cables;
  • special two-piece bag for storing a detachable cables;
  • bag form the power supply;
  • sticker with the company’s logo;
  • manual.


Seasonic Platinum 660 (Seasonic SS-660XP2)

Externally Seasonic Platinum 660 doesn’t differ from more efficient counterparts (Seasonic Platinum 760 and Seasonic Platinum 860). The product has similar dimensions (160 x 150 x 86 mm) and the same case structure. By the way, the quality of the last is at the highest level: the panels are made of thick steel, have good edge handling and fit tightly to each other.

Seasonic Platinum 660 (Seasonic SS-660XP2)

This model uses a familiar layout of the vents. They can be found only on the cover and the front wall, while the other panels are made continuous. Manufacturer refused to use the traditional "grilling", replacing it with a mesh in honeycomb. According to the company's employees Sea Sonic Electronics, this design should better effect on airflow resistance.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Since the power supply Seasonic SS-660XP2 belongs to a series of high-end devices, the system output cables it is organized on a fully modular. That is they are detachable, even those that are designed to supply the motherboard and processor. This technical performance greatly simplifies the process of connecting components and routing of cables.

Seasonic Platinum 660 (Seasonic SS-660XP2)

The rear panel has 13 connectors that are signed and have a different design. Therefore, even inexperienced users can easily deal with the connections of the modular cables. But just in case will specify the purpose of each of them:

  • 18-pin and 10-pin («M/B») - to power the motherboard;
  • five 6-pin («Peripheral IDE/SATA») - to supply periphery
  • six 8-pin («CPU / PCI-E») - for additional power processor and graphics card.

Attentive readers have noticed that the number and location of connectors at the Seasonic Platinum 660, Seasonic Platinum 760 and Seasonic Platinum 860 is identical. This does not mean that all three solutions have the same capabilities. The use of the universal components can significantly reduce the final cost of the power supply, saving resources for their development and future production. Most importantly, this approach does not suffer the quality of the final product.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Another characteristic feature of the top solutions from Sea Sonic Electronics is a hybrid cooling system, which at low loads on the power supply is capable of operating in a completely passive mode. In other words, the fan does not rotate, and the device doesn’t produce a single sound. Moreover, the better organized air circulation inside the computer case, the later fan start. If Seasonic Platinum 660 is planned to operate in an environment of high temperature, the hybrid cooling system would be appropriate to transfer to normal operation. For this purpose there is a special rear toggle labeled «Fan Control». In this case, the fan will start immediately after turning on the PC and will run regardless of the nature of the load on the power supply.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Organization of the cable system only deserves the highest praise. Not only that, they are all made detachable, so more and most of them has the form of strips (traditional braid was found only on the beam of the cables leading to the motherboard). In this version, they are more flexible that has a positive impact on their usability.

The main power connectors have the following configuration: collapsible 20+4-pin ATX and two 8-pin ATX12V (one of which is also collapsible). The additional power of graphics card is provided four 6+2-pin PCIe. Thus, Seasonic Platinum 660 can be used without problems in the dual-composition or gaming systems configurations that contain multiple graphics cards. Yes, we're talking about solution with capacity of only 660 W. 

The number and configuration of cables for connecting peripherals is also at high level: available connectors SATA and PATA are enough, and they are located on different cables. Thus, buying this adapter, you can not only power all the necessary components, but also to make it the best possible way.

Socket type


Cable length to socket (connectors), cm

Modular (detachable) cables

20+4-pin power socket ATX



4+4-pin power socket ATX12V



8-pin power socket ATX12V



6+2-pin socket PCIe



three sockets PATA



two sockets PATA



four sockets SATA



two sockets SATA



adapter PATA-FDD



Seasonic Platinum 660 (Seasonic SS-660XP2)

Now let's take a closer look at the technical characteristics of the model Seasonic SS-660XP2. Its nominal power is 660 W. The same value has line +12V, which naturally is made in a single line. In other words, everything is done to ensure that the user won’t have any problems with the connection of the productive components and their subsequent overclocking. Lines +3.3V and +5V have a maximum total power of 125 W and are designed for a load of 25 A each. Again, it will impose minimum restrictions when choosing PC configuration.

As you might guess from the title, Seasonic Platinum 660 complies with standard 80 PLUS Platinum, which has a fairly high level of efficiency requirements for power supply. Thus, for the voltage of 230 V at a load of 20%, 50% and 100% of the nominal power, this figure should not fall below 90%, 94% and 91% respectively.

Also note a wide input voltage range (100 – 240 V), which eliminates the external voltage regulators in an unstable power supply.

Internal device 

Seasonic Platinum 660 (Seasonic SS-660XP2)

To cool internal components there is 120mm 7-blade fan SANYO DENKI 9S1212F404. It has an excellent ratio of performance to the noise. In addition, the use of a rolling bearing and improved methods of balancing allow to speak about its high reliability and long service life. In our opinion, this is one of the most balanced 120-solutions, available on the market today for the fans (different brand solutions with the highest price tags are not considered).





Voltage supply, V


Current, А


Capacity, W


Max rotation speed, rpm


Air flow, CFM


Noise level, dB

Up to 30,0

Dimensions, mm

120 х 120 х 25

Seasonic Platinum 660 (Seasonic SS-660XP2)

The heart of the new revision of PSU Seasonic Platinum 660 is the same platform as the previous version - Seasonic KM3 that is quite logical. This modern circuitry allows to achieve a high efficiency, and can easily provide the required output characteristics of the respective components in the database. 

Seasonic Platinum 660 (Seasonic SS-660XP2)

We have already talked about the active part of the cooling system, but now it's time to note a passive. After all till a certain load Seasonic Platinum 660 can work with inactive fan and a fast and efficient heat dissipation at this point becomes a major task. That is why each group of power components inside the power supply is equipped with its own separate aluminum radiator with large fins.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Furthermore, even the case takes part in cooling the component. In this case, the process of heat transfer is realized through thermal pads, which is in contact with a special metal pad disposed on the rear side of the main PCB. Seemingly plain but at the same time quite effective technical solution.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Seasonic Platinum 660 (Seasonic SS-660XP2)

The input of the high-voltage side has an EMI-filter for smoothing the high-frequency noise emitted by the power supply. Also it bears the function of lightning protection. The practice realization of this site has no complaints, because there are all the necessary components (three X- and six Y-capacitors, three chokes and varistor), which is the key to its efficient and stable operation.

Near is a diode bridge for rectifying the input voltage, consisting of two diode arrays and the choke of active Power Factor Correction (APFC) module of slightly unusual design.

Seasonic Platinum 660 (Seasonic SS-660XP2)

APFC power section includes two MOSFETs Infineon 5R250P and Schottky diode STPSC606D. Their operation is controlled PWM controller NCP1654.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Manufacturer of high-voltage capacitors (220 uF x 420 V) is a Japanese company Nippon Chemi-Con, production of which has the highest quality. Since they are connected in parallel, we obtain the total capacity of the node at the level of 440 uF - an excellent result for the 660 W devices. Note also that the maximum operating temperature of the capacitor is 105°C, instead of 85°C, as most analogues of uncertain origin.

Seasonic Platinum 660 (Seasonic SS-660XP2)

The inverter is built on a highly resonant circuit with a full bridge. Its keys are the four transistors Infineon 5R399P, who work in pairs under the control of the PWM controller CM6901. The correct functioning of duty power supply (line +5VSB) is provided chip ICE2QR4765.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Low-voltage part of model Seasonic Platinum 660 is a synchronous rectifier: there is one powerful +12V line that provides voltage +3.3V and +5V. This is a fairly progressive method to achieve high output. And the presence of a dedicated +12V line in today's realities is a lot of advantages, which we have already talked a little bit earlier.

Unlike kilowatt solution (Seasonic Platinum 1050 and Seasonic Platinum 1200), here the transistors are located on the daughter board and covered a large heatsink to form the primary voltage. Therefore, neither marking nor even quantity was clear.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Seasonic Platinum 660 (Seasonic SS-660XP2)

And the DC-DC-converters have convenient access achieved by using the original design of this unit: power unit (six transistors Infineon BSC0906NS and manage PWM controller APW7159), filters and components of the modular connectors are located on one printed circuit board. This approach allows to refuse the energy loss on the underwater cables, promotes better cooling of transistors and simplifies the layout of the power supply. In other words, one engineering solution killed three birds with one stone.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Seasonic Platinum 660 (Seasonic SS-660XP2)

Naturally, the power supply of this level uses separate system of output stabilization voltage, and the process of smoothing uses only qualitative Japanese capacitors from top brands (Nippon Chemi-Con, Rubycon and FPCAPS).

Seasonic Platinum 660 (Seasonic SS-660XP2)

According to the technical specifications, model Seasonic Platinum 660 has the whole series of protections (OVP, UVP, OPP, SCP, OCP and OTP), including protection against overload and overheating. The node is based on the chip Weltrend WT7527V and implemented on a separate circuit board.

Seasonic Platinum 660 (Seasonic SS-660XP2)

Quality board layout and mounting elements, as always, deserves only the most flattering words: perfect tracks and excellent soldering. No sagging flux or other defects were not found. First of all it says about the accuracy and the organized assembly of line that minimizes the appearance of failure during production.

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