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Seasonic Platinum 1200 power supply unit: review and testing

In the past year the company Sea Sonic Electronics is distinguished not only extension of the model range of power supplies for the masses, but also pleased the enthusiasts of computer technology. We are talking about two new representatives of the lineup Seasonic Platinum (Seasonic Platinum 1050 and Seasonic Platinum 1200) and design solutions Seasonic Snow Silent 1050. As you might guess from the name, they all have a capacity over 1,000 W and are designed for very heavy loads.

The most interesting is a 1200 W model Seasonic Platinum 1200 (Seasonic SS-1200XP3). Most of users probably can not imagine where a power supply may be applied. But remember gaming systems with several top-end graphics cards or overclocking experiments. In these cases productive power supplies are very important. In addition, Seasonic Platinum 1200 belongs to the flagship lineup Seasonic Platinum, which promises us a great level of efficiency, efficient cooling system, the modular configuration of the cables, high-quality components and other interesting advantages.

Seasonic Platinum 1200 (SS-1200XP3)

The spec:


Seasonic Platinum 1200

(Seasonic SS-1200XP3)



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)



10 (6+2-pin)

Support of technologies NVIDIA SLI / AMD CrossFireX




Efficiency, %

> 91

Certified 80 PLUS


Power factor, %


Method of Power Factor balancing


Input voltage, V

100 - 240

Frequency, Hz

50 - 60

Input current, А

7,5 - 15

Fan dimensions, mm

120 х 120 х 25

Fan speed controller

Yes (hybrid cooling system)

Noise level, dB


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


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

CB, CUL, CCC, TUV, GOST-R, BSMI, CE, UKR, FCC, C-tick, RoHS, WEEE, ErP Lot 6 2013



Dimension, mm

190 х 150 х 86


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

Warranty, years


Producer website


Product page

Seasonic Platinum 1200

Packaging and content

Seasonic Platinum 1200 (SS-1200XP3)

Power supply Seasonic Platinum 1200 comes in a cardboard box, which provides protection against shocks and possible mechanical damages. The package is decorated in a traditional platinum series style and has good informative content. At the end, you can find detailed characteristics of the device, and on the back is a brief description of its major advantages.

Seasonic Platinum 1200 (SS-1200XP3)

Particular attention is drawn to items «Ultra Tight Voltage Regulation» and «Seasonic Hybrid Silent Fan Control - S2FC & S3FC». The first reports that the stabilization system in  Seasonic Platinum 1200provides a much smaller voltage deviation on the output lines than that provided by the standard ATX12V (±5%). Thus, on the channel +12V it varies from 0% to + 2%, on +3.3V and +5V from -1% to + 1%. And these figures are valid for all types of loads that can reach value of 1200 Ws.

Seasonic Platinum 1200 (SS-1200XP3)

Section «Seasonic Hybrid Silent Fan Control - S2FC & S3FC» is devoted to a description of the control system of fan speed, bearing in this case the hybrid nature. We have repeatedly seen this technology work, and it always leaves only the best impressions. For those who do not follow the market of modern power supplies, we briefly recall: the main difference between a hybrid cooling system from the usual is that till reach a certain temperature the fan is not rotated at all, and then the speed of its blades rotation is determined by heating components and load level. That is, at low loads (in this case up to 35% (± 5%) of the nominal value) Seasonic Platinum 1200 runs completely silently.

Compared with other solutions in a series of Seasonic Platinum, here engineers have improved algorithm of current technology. The first innovation has touched mark the start of the fan (30%, it was shifted to 35%). The second is to add a so-called hysteresis area (25% - 35%), thus avoiding the situation with constant activation/deactivation of the fan at low loads. Such modernization should further improve the acoustic properties of the power supply.

Based on the information from the box, the capabilities of the model Seasonic Platinum 1200 look really impressive. Let’s now take a closer look with the source of power, but first look at the set of its delivery.

Seasonic Platinum 1200 (SS-1200XP3)

Seasonic Platinum 1200 (SS-1200XP3)

Inside the box all the components are packed in different bags. Also we were pleased with the presence of additional clamps and ties to organize a neat cable arrangement inside the computer case. The whole package consists:

  • AC power cord;
  • fixing screws;
  • modular cables that are in a special bag;
  • eight clamps to secure the wires;
  • five reusable ties;
  • sticker with the logo of the company;
  • manual.

Modular cables are not represented in the picture and we will learn them little bit latter.


Seasonic Platinum 1200 (SS-1200XP3)

Seasonic Platinum Model 1200 has a typical "platinum" series design - black body with silver grille. The build quality, handling and fitting of the panels is at the highest level.

Seasonic Platinum 1200 (SS-1200XP3)

We draw your attention to the increased dimensions of the device, which here are 190 x 150 x 86 mm. Conventional power supply units are typically shorter by 30 - 50 mm. This won’t create any problems. The only thing you should take into account that seat for an extra fan on the bottom of the computer case will be partially overlapped.

The front wall is dotted with perforations for hot air removal. Here is a power outlet and the power button. The remaining panels are made continuous. In general, everything is standard. Much interesting is the rear panel.

Seasonic Platinum 1200 (SS-1200XP3)

Here are connectors for cables output. And they all have a modular design, even those that are used to power the motherboard and processor. This technical solution is very useful in the case of connecting a large number of components, as well as hidden cabling. All connectors are signed and have a different design, so there should be no difficulties for the user. But just in case we 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
  • eight 8-pin («CPU / PCI-E») - for additional power processor and graphics card.

In total we have 15 connectors. It is difficult to imagine a system in which it will be necessary to use all of them. A similar configuration of modular connectors we met only in one power supply unit, which was built on the platform of Sea Sonic Electronics.

In the upper right corner you can also find a switch that is marked as «Fan Control». In position «Hybrid» fan will operate as described in the previous section diagram. And in mode «Normal» it begins to rotate immediately after starting the PC, that is, even at minimum load. In other words, the user can determine which option is more preferable. For example, the mode «Normal» would be useful if the power supply is operated in an environment of high temperature.

Seasonic Platinum 1200 (SS-1200XP3)

Detachable cables are made in the form of strips that positively affects their usability. Main power connectors have the following configuration: folding 20+4-pin ATX and two 8-pin ATX12V (one is also folding). That is the model Seasonic Platinum 1200 is suitable for dual-processor systems and for overclocking experiments using extreme cooling systems such as liquid nitrogen.

Other computer technology enthusiasts and gamers and will be satisfied with purchase of this power supply because here are 10 connector PCIe. And they all have a 6+2-pin versions. Thus Seasonic Platinum 1200 will provide a maximum possible gaming configuration that may include 4 graphics accelerator combined in mode AMD CrossFireX or NVIDIA SLI. If we are talking about a system to produce cryptocurrency, then their composition sometimes includes six cards at once, so a large number of PCIe connectors in this case would be very useful.

Seasonic Platinum 1200 (SS-1200XP3)

The rest of connectors are at good level too. The presence of 5-PATA connectors and 14 SATA, as well as thoughtful location on the cables will allow to connect all the peripherals in the best possible way, even if it comes about building a file server. FDD socket is detachable (as adapter PATA-FDD).

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



two 6+2-контактных разъема PCIe



6+2-socket PCIe



three PATA sockets



two PATA sockets



tour SATA sockets



two SATA sockets



PATA-FDD adapter



Seasonic Platinum 1200 (SS-1200XP3)

Now let's take a closer look at the technical characteristics of the power supply. Its nominal power is 1200 W. Channel +12V is formed as a single line with a loading capacity up to 100 A. In other words, if necessary, it is possible to "remove" the 100% of the total power. It is a very good step from a technical point of view, if we are talking about systems for gaming and overclocking experiments. Lines +3.3V and +5V have a maximum total power of 125 W and are designed for a load of 25 A each.

As you might guess from the title, in terms of energy efficiency Seasonic Platinum 1200 complies with standard 80 PLUS Platinum. Also this is proved by the picture on the label. Recall that the power supplies are standardized according to 80 PLUS Platinum, if their efficiency for voltage 230V at loads of 20%, 50% and 100% does not fall below 90%, 94% and 91%, respectively.

Also do note a wide input voltage range (100 - 240), which eliminates the external voltage regulator in an unstable power supply conditions.

Internal device

Seasonic Platinum 1200 (SS-1200XP3)

The process of power supply Seasonic Platinum 1200 dismantling is standard: you need just unscrew the screws securing the top cover. We draw your attention to the presence of a special sticker with the inscription «Warranty void if removed».

To cool internal components a 120mm 7-blade fan SANYO DENKI 9S1212H403 is used. It is based on a reliable rolling bearing. Unfortunately, the manufacturer does not reveal the details of its aerodynamic properties.



Bearing type

rolling (Dual Ball)

Supply voltage, V


Current, A


Capacity, W


Maximum rotation speed, rpm


Air flow, CFM


Noise level, dB


Dimensions, mm

120 х 120 х 25

Seasonic Platinum 1200 (SS-1200XP3)

The model Seasonic Platinum 1200 is based on the platform of its own design of a series of Seasonic XP3, which is a further modernization of series Seasonic KM3. In other words, it is the most modern and advanced circuitry in the arsenal of Sea Sonic Electronics. And it is not surprised that the famous brands in the production of high-quality solutions of high power use is this platform.

Seasonic Platinum 1200 (SS-1200XP3)

At the input of high-voltage is an EMI-filter. It is divided into two parts and includes a full set of required elements (three X and four Y-capacitor,s three chokes and varistor) to perform its function to smoothhigh-frequency noise emitted by the network power supply. Separately we want to note the careful approach to the manufacturer's isolation and screening of the filter elements.

Seasonic Platinum 1200 (SS-1200XP3)

Rectification of the input electrical current is carried by two diode arrays, which have a separate cooling radiator of impressive size. Behind you can find the choke of active power factor correction (APFC) and its power section, consisting of three high-power field-effect transistors Infineon 6R125 and Schottky diode ROHM SCS110AG. Their cooling is at the highest level. Don’t forget that Seasonic Platinum 1200 till a certain load can work with inactive fan so fast heat dissipation in passive mode is one of the most important tasks.

Seasonic Platinum 1200 (SS-1200XP3)

High-voltage capacitors are represented by three elements (390 uF x 420 V, operating temperature up to 105°C) produced by the Japanese company Hitachi, which guarantees their high quality and long service life even under constant heavy loads. Since they are connected in parallel, the total capacity of this unit is 1170 uF and it is an excellent result for the 1200 W device.

Seasonic Platinum 1200 (SS-1200XP3)

As with most high-performance solutions, the model Seasonic Platinum 1200 applies resonant converter with full-bridge. Its keys are t four transistors Infineon 5R199P, which operate in pairs under the control of the PWM controller CM6901.

Seasonic Platinum 1200 (SS-1200XP3)

However, a greater interest is the low voltage of the power supply. The principle of its organization compared to previous models from Seasonic Platinum Series has not changed: it uses the same synchronous rectifier with the main line +12V that provides voltages +3.3V and +5V. But the structure undergone to significant modernization. In particular, a separate board with transistors to form the +12V channel is absent.

Seasonic Platinum 1200 (SS-1200XP3)

The power elements (Fairchild FDMS015N04Bin the amount of 8 pieces) moved on the back side of the PCB. Heat is transmitted to the above-mentioned heat sink, where with the help of the fan natural convection is removed outside the device.

Seasonic Platinum 1200 (SS-1200XP3)

But that's not all. Don’t forget that we are not dealing with the production of ordinary OEM-manufacturer, but Sea Sonic Electronics, where engineers tried every component of the power supply to use as efficiently as possible, even when it comes to case. As can be seen from the photo, it also acts as a kind of heat diffuser generated by the power transistors on the +12V line. It is a perfect solution.

Seasonic Platinum 1200 (SS-1200XP3)

Converters of remaining voltages are wired on a separate board. In the formation of lines +3.3V and +5V is realized by six transistors Infineon BSC0906NS (three for each channel). Their heating during operation is so small (on-state resistance of only 4.5 milliohms), which is enough for blowing by preinstalled fan. Control of DC-DC-converters is provided by the PWM controller APW7159.

Seasonic Platinum 1200 (SS-1200XP3)

The reverse side of the card has a part of the modular connectors and other components of converters: two coils and filter capacitors of polymer type (470 uF x 16 V and 560 uF x 6.3 V).

Outputs which bear a large load (for additional power connection cards) are located directly on the main PCB to minimize the energy loss due to underwater lines.

Seasonic Platinum 1200 (SS-1200XP3)

Seasonic Platinum 1200 (SS-1200XP3)

The smoothing the channel interference on the channel +12V is provided by elements either with solid (330 x 16 uF) or liquid electrolyte (1000 x 16 uF). In all cases, their producers are reputable Japanese companies Nippon Chemi-Con and Rubycon.

Seasonic Platinum 1200 (SS-1200XP3)

According to the technical specifications, model Seasonic Platinum 1200 has the whole series of protections (OVP / UVP / OPP / SCP / OCP / OTP), including protection against overload and overheating. The node is based on chip-supervisor Weltrend WT7527V.

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