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Seasonic S12II 520 Watts PSU

  • 520 W Power Output
  • 1 x 12V Power Rail
  • 100 - 240 Vac Input
  • 87 % Efficiency
3 Years Seasonic India Warranty and Free Transit Insurance. See Details
Rs. 5500 10% Off
Rs. 4950
Inclusive of taxes
(Free home delivery)
85% positive feedback [?]
(538 ratings)
COMBO OFFER: Exciting combos available View combos
In Stock.
Standard delivery in 10-11 business days. [?]
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Rs. 5246
(Free home delivery)  
In Stock.
Standard delivery in 8 to 9 business days.
Seller: PrimeABGB
73% positive feedback [?]
(99 ratings)
10 Day Replacement Guarantee [?]

Key Features of Seasonic S12II 520 Watts PSU

  • 520 W Power Output
  • 1 x 12V Power Rail
  • 100 - 240 Vac Input Voltage
  • 87 % Efficiency

Specifications of Seasonic S12II 520 Watts PSU

In The Box
Sales Package SMPS Unit, Cables, User Guide
Brand Seasonic
Series S12II Bronze Series
Power Output 520 W
Processor Support Intel and AMD Processor Support
Power Rail 1 x 12V Power Rails
Model Name S12II-520
Power Factor Correction (PFC) Active PFC with Value of 0.99
Input Voltage 1 100 - 240 V
Input Frequency 50 - 60 Hz
Efficiency 87 %
Maximum Current
Current at DC Output of +3.3 V 24 A
Current at DC Output of +5 V 24 A
Current at DC Output of +12 V 40 A
Current at DC Output of -12 V 0.8 A
Current at DC Output of +5 V sb 2.5 A
Fan Type 1 x 120 mm Ball Bearing, Smart and Silent Fan Control (SFC), Soft-Mounting Rubber Cushion
Temperature 0 to 50 °C (Operating Temperature)
Humidity 20 to 80 % (Operating Humidity)
Protection Over Voltage Protection (OVP), Over Temperature Protection (OTP), Short Circuit Protection (SCP)
Certification 80 Plus Bronze
Motherboard 1 Motherboard Connector with 20 pin, 24 pin
CPU 2 CPU Connector with ATX 12V (4 pin) + EPS 12V (8 pin)
PCI-e 1 PCI-e 6 pin
SATA 6 SATA Cables
Floppy 2 Floppy Connector with 4 pins
Peripheral 6 Peripheral Connector with 4 pins
Other Features
Additional Features Double Forward Converter Design
Width x Height x Depth 150 x 86 x 140 mm
Domestic Term 3 Years
Service Type Carry In
Covered in Warranty All Manufacturing Defects
Not Covered in Warranty Burnt or physically damaged or customer induced damaged is not covered under warranty
Warranty Type Limited
Warranty Summary Customers can get RMA support by sending email to with their purchase details. After verification that the product is sold by Tirupati, they will receive instructions on how to return the defective product They can also get in touch with any of our branch offices across india for rma support with the proof of purchase.
Please note: All products sold on Flipkart are brand new and 100% genuine

Reviews of Seasonic S12II 520 Watts PSU

Average Rating
Based on 79 ratings
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Most Helpful Reviews (5 of 31)

26 May 12
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certified buyer
Amazing so far

I think most people have covered the stellar performance of this PSU in their reviews. I'd like to add a couple of points :

1.Before assembling my new PC I took a multi meter to the output of the Seasonic S12II 520. The amperage of 12v/5v/3.3v was within miliamps of what was claimed. And that is amazing. My experience with another popular competitor was disappointing.

2. There is hardly any noise from this PSU again comparing with the popular competitor this was superior in every respect.

3. The price maybe a bit steep for a non modular PSU but the quality seems to be very good.

4. Supplied power cable was a european one ( in europe the ground pin is in the socket not the plug) . I had to get my own power cord . I really wanted to deduct a star for that but the unit is just to true.

The only thing left to examine is how it would fare in the next few years. That only time will tell. But it looks like I might be switch to Seasonic for my future rigs.

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5 of 6 users found this review helpful.
24 September 12
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certified buyer
Very Good Gaming Power Supply

Got this during the first week of June 2012 and going great since then.
Ample number of cables and a spare converter cable.
All cables are sturdy and are covered with glass fibre gauze sleeve to protect from damage from any fans/ hot spots.
A couple of cables needed for motherboard/ GPU connections may clutter with the GPU/ cabinet/ cPU fans. One can easily take care by straping.
The ATX cable, HDD, ODD cables can be managed very well.
I have connected 12V 24 pin (ATX), 8 pin, 4 pin to the motherboard, one 6 pin to the PCIe/ GPU, 3 SATA power connectors for 1 SSD, 1 HDD and 1 DVD drive. Still there are many spare connections. Use the OEM's strap for managing the unused spare cables. In all I have 5 fans running inside the cabinet and one in the PSU. Ventilation has to be maintained.
This PSU can give 40A @ 12V max.
Cooling fan is pretty much silent with silent fan control (SFC).
I have mounted it at the bottom of my Cooler Master CM 690 II Advanced Mid Tower Cabinet. The upward draft of the cooling fan accumulates dust on the mesh filters. Simple brushing is good enough once in a while.
The voltage stability is less than +/-5% (Checked with BIOS), where as +/- 10% is the norm and power efficiency rated is 87%, which is best in the class, compared with Corsair CMPSU-600CXV2UK and Cooler Master GX 550.
I have underclocked the RAM voltage by -0.05V to keep it closest to +1.50V, else RAM starts giving errors in Memtest86+. Current RAM's are not very forgiving.
There was a short circuit on my motherboard and yet the pSU, which was doubted as the souce, is working fine.
Comes with 5 year Warranty.

There was a differrent picture of modular x-series, Which did influence me while placing the order, but I had cross verified with other sources. The picture was changed immediately.

My rig is
CPU: AMD FX-4100, 3.6 GHz
CPU Cooler: Cooler Master Hyper TX3EVO
Motherboard: Biostar TA990FXE
RAM: G.Skill RipjawsX DDR3 16GB RAM (F3-12800CL9Q-16GBXL)Quad Channel,
Graphic Card: MSI AMD/ATI R6850 Cyclone 1GDS Power Edition/OC 1GDDR5
Power Supply: Seasonic S12II-520 520 Watts PSU~
Cabinet: Cooler Master CM 690 II Advanced Mid Tower Cabinet
HDD: WD Caviar Green 1 TB HDD Internal Hard Drive (WD10EARX)
SSD: Verbatim 64 GB Internal Solid State Drive
Optical Drive: Asus DRW-24B3ST Internal Optical Drive (Black)
Monitor: Dell 24 Inch Full HD WideScreen LED Monitor (ST2420L)
Audio: Logitech Z506 5.1 Multimedia Speakers
Keyboard & Mouse: Logitech Wireless Combo (MK320) USB
OS: Windows 7 Home Premium

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2 of 2 users found this review helpful.
13 June 13
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certified buyer
Superb service by Flipkart, EXCELLENT PSU by Seasonic

Ordered this on 11th June (evening) and got it today (13th) at about 12 noon. First time on Flipkart and I have to say I'm quite satisfied with their service. The price is a *bit* higher than what's on the box, though. Anyway, the PSU is just awesome. I haven't handled any PSU remotely as substantial as this one before. It's HEAVY. And the cables are all sleaved, the fan is dead silent. My GPU fan and even the CPU fan makes more noise than this. Lot's of connectors - more than what I'm gonna need on this aged box. But do notice that the supplied POWER CABLE is not made for India... there is no "ground" pin. In other words, you will have to use your own power cable. I hope Seasonic does something about this soon. My cabinet is pretty ordinary (iBall ATX) so no cable management whatsoever. But managed to duck the tentacles inside empty optical drive bays anyway. A nice cabby would have been better though :( I'm planning to assemble a new Haswell build soon, so not wasting any money on this crappo right now. I hope Flipkart stocks the Carbide 500R soon.

Looks like the absence of the ground pin is not because of the European bs - it's a required necessity according to specifications set by Intel. Read this FAQ on Seasonic's website:
"Q41 Why does the Seasonic power supply have an empty pin in the main power connector?

In the past, this empty pin in the main power connector was to support –5V output. Now that the –5V is no more necessary for modern PC, according to Intel’s Power Supply Design Guide, this pin should keep empty to fit the specification. Therefore, it is not a defect on your power supply. For more information, please refer to Q24 Why remove –5V?"

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0 of 0 users found this review helpful.
17 August 12
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Great so far...

Have assembled my system a fortnight back and the PSU seems to be doing its job very well:
1. AMD A8-3870K
2. ASUS F1A75M-PRO Mobo
3. G.Skill RipjawsX DDR3 8 GB (2 x 4 GB) PC RAM
4. WD Caviar Green 2 TB HDD
5. Asus DRW-24B5ST DVD Writer
6. Cooler Master CM 690 II Advanced Cabinet

Pros: This PSU exudes quality!
1. Build quality is superb (quite heavy too!);
2. Great specs (40A on +12V power rail - awesome!);
3. Abundant connectivity;
4. Sleeved cables;
5. Very silent and cool;
6. Has many power options to accommodate old and new Intel and AMD systems.

Cons: (resulting in the deduction of a star)
1. Power cables fell a bit short for my cabinet and mobo combination (could not route them from behind the mobo);
2. Had to buy an Indian power cable;
3. Warranty confusion;
4. A bit overpriced.

Nonetheless, does its job really well. Has great online reviews. Hope it keeps delivering.

And off course Flipkart packaging and delivery was great!

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1 of 1 users found this review helpful.
Jaideep Sharma
20 June 12
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Very good PSU

Seasonic has a good reputation and makes high quality PSUs
I am using this with a phenom ii x4 970 processor and gtx 550ti and it runs smoothly
40Amps on 12v rail
Made with highest quality parts

Cables are Stiff and hard to bend

P.S - If you are confused btw corsair cx500 and this then I would suggest you buy this PSU because corsair's CX and GX series PSUs are pretty generic and have a high chance to be dead on arrival(DOA) also this has 40amps compared to 34 of the corsair's.

A PSU is a very important part of a computer so you should always go for a good branded one like this one.

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3 of 3 users found this review helpful.

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     Seasonic S12II 520 Watts PSU Price in India: Rs. 4950


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