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SeaSonic USA > 
Item#: N82E16817151113

SeaSonic SS-300TGW 300W TFX12V (v2.31) 80 PLUS GOLD Certified Active PFC Power Supply

  • TFX12V (v2.31)
  • 80 PLUS GOLD Certified
  • 47 - 63 Hz
  • +3.3V@10A, +5V@14A, +12V1@18A, +12V2@18A, -12V@0.3A, +5VSB@2A
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A blend of performance and quality, the Sonic SS-300TGW TFX power supply is a great choice for ultra compact PCs or other small form factor systems. High in efficiency and low in ripple, this unit is 80 PLUS certified for better usage of every watt of input AC power. Robust power output means your rig can run stably and reliably, while superb protection circuits help avoid device damage. One quiet fan provides a great air flow so your PSU stays cool, even at demanding load levels.

  • newegg 80 PLUS Gold-certified efficiency The 80 PLUS GOLD certified power supply provides high power efficiency of at least 87% at any load between 20% and 100%, saving your money on your electric bill, reducing heat in your computer's system, and prolonging its life.
  • newegg Robust Power With DC to DC converter design, this unit delivers a robust 300W of maximum power for your rig. Dual +12V rails with 300W max. combined output provide sufficient juice for your multi-core CPU. The 100% hi-pot test, 100% burn in test, and high temperature cycled on/off guarantee reliability and stability.
  • newegg Premium Protection Short circuit protection on all outputs and over power protection safeguard your valuable components from power abnormalities.
  • newegg Silent Cooling Fan The super low noise fan produces a massive air flow that keeps your PSU running cool and always at peak performance.

Learn more about the SeaSonic USA SS-300TGW




TFX12V (v2.31)
Maximum Power
Main Connector
+12V Rails
Haswell Support
> 87%
80 PLUS GOLD Certified
Over Voltage Protection
Input Frequency Range
47 - 63 Hz
+3.3V@10A, +5V@14A, +12V1@18A, +12V2@18A, -12V@0.3A, +5VSB@2A
>100,000 Hours
CUL, TUV, CB, CE, FCC, C-tick
6.9" x 3.3" x 2.5"
2.5 lbs.


Main Power (24/20P) x 1
ATX12V (4P) x 1
Peripherals: SATA, HDD, FDD
Support the latest Intel & AMD Socket

DC to DC converter design

High efficiency and reliability

Low ripple & noise

Super low noise fan control

Short circuit protection on all outputs

Over voltage protection

Over power protection

100% hi-pot test

100% burn in, high temperature cycled on/off

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the SeaSonic USA SS-300TGW

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  • Nighat A.
  • 9/19/2014 7:39:30 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggs

Pros: Works great and runs quiet.

Cons: None, as of yet, that is.

Other Thoughts: Didn't fit in my case, but that was my fault for not measuring before buying.

Did you find this review helpful? Yes No

  • Joseph S.
  • 4/17/2014 10:08:08 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsMuch quieter

Pros: This power supply got the job done very quietly. Now I can almost hear the electronic whining noises that have nothing to do with fans.

Cons: Didn't quite fit the space exactly, but that's probably the case I have. Specifically, the screwholes up front seemed slightly off and the back brace had a too-wide tab and wouldn't attach. The zip tie holding the bundle of cords close to the power supply was too far away and interfered with cable routing so I had to cut it.

Other Thoughts: Bought this to replace a terribly loud 200W that came with my Winsis WT-02C case. This is much better. Cables are about the right distance but I can see this becoming a problem with anything larger.

Did you find this review helpful? Yes No

  • Kevin B.
  • 1/27/2014 10:56:04 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggs

Pros: fits perfectly. it is tfx standard.
Haswell compliant
Fan only turns on when needed making it very quiet.

Cons: cables were a bit short for my application.

Other Thoughts: especially short was the 4pin cpu power cable. the only way for it to fit is streching it straight across the MB. be prepared to get an extender or splice if you have your case mounts the power supply on the bottom!

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  • Rhandi K.
  • 12/31/2013 9:27:30 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsKept an itx system running

Pros: Fit perfect into the space and leads were long enough

Cons: none so far

Did you find this review helpful? Yes No

  • Anonymous
  • 3/27/2013 6:52:15 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week

5 out of 5 eggssilent nights...

Pros: SILENT!!!!... up about 50% load.
without power cord. (OEM version)
three sata plugs, one molex plug, one "floppy" power plug (small 4pin connector)

Cons: none, perhaps only one molex connector.
no pci-e power plugs, (but that is due to the power rating)

Other Thoughts: can not stress enough that the fact that this psu's fan only spins, at around 50-100% load!... so it is SILENT!!! ( most computers idle at under 100 watts)

the one molex plug is not really a drawback, (and ide HDD's are "tech junk collectors" stuff) (because they include 3 SATA plugs)... but if you are going to power a graphics card you will need an adapter. )
graphics cards that need two pci-e power plugs, tend to be paired with powerful CPU's so that might go over the power rating.

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  • Greg H.
  • 2/7/2013 10:43:18 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsGold

Pros: Quiet, Efficient. Seasonic Reliability.

Cons: Expensive-ish. Larger than the PicoPSU it replaced.

Other Thoughts: As to the $25.00 warranty handling fee, I thought this was only if they tested it and determined that nothing is wrong with it and it is within specs. That would blow my mind if Seasonic started pulling $25 handling fees for honoring the warranty.

0 out of 1 people found this review helpful. Did you? Yes No

  • Jonathan R.
  • 12/18/2012 6:11:41 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsQuite a racket they have going

Pros: Cheap. Not too loud.

Cons: I was skeptical about this low cost power supply, but it came with a five year warranty. So I thought - what could go wrong? If it dies I'll RMA it. Mine lasted about two weeks. Motherboard light comes on, but no main power anymore. So, I went to the support site to start looking into how to exchange it. Turns out that not only do you have to pay out of your own pocket to ship the dead unit to them (not such a surprise there), but they also charge a $25 "handling fee" to exchange it for a refurbished one. I'm guessing they do a lot of handling. You have to pay significantly more than half of the cost of the product itself just to get the company to honor their "warranty." Learned my lesson on that one.

6 out of 6 people found this review helpful. Did you? Yes No

  • Jennifer G.
  • 11/13/2012 2:15:32 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsAwesome

Pros: good quality, fairly quiet

Cons: none

Other Thoughts: I needed to upgrade my Dell Vostro slim (ST) with a better graphics card (Nividia GeForce GT 520), so I had to also upgrade my power supply. This one works great. It's not very loud and gets the job done.

2 out of 2 people found this review helpful. Did you? Yes No

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SeaSonic USA > 
Item#: N82E16817151113
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