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SeaSonic USA > 
Item#: N82E16817151089

SeaSonic SS-300SFD 300W SFX12V v3.1 80 PLUS Certified Active PFC Power Supply - OEM

  • SFX12V v3.1
  • 80 PLUS Certified
  • 100 - 240 V 50/60 Hz
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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A blend of performance and quality, the Sonic SS-300SFD SFX 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 great air flow so your PSU stays cool, even at demanding load levels.

  • newegg 80 PLUS Certified Compliant with 80 PLUS standards, this power supply is at least 80 percent efficient across a range of loads (20 percent, 50 percent, and 100 percent), ensuring less heat generation and a lower utility bill.
  • newegg Robust Power This unit delivers a robust 300W of maximum power for your rig. Dual +12V rails provide sufficient juice for your multi-core CPU.
  • 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 80mm double ball bearing fan produces q massive air flow that keeps your PSU running cool and always at peak performance.

Learn more about the SeaSonic USA SS-300SFD




SFX12V v3.1
Maximum Power
8cm Double Ball Bearing
Main Connector
+12V Rails
Haswell Support
Hold-up Time
16ms min.
> 80%
80 PLUS Certified
Over Voltage Protection
Input Voltage
100 - 240 V
Input Frequency Range
50/60 Hz
>100,000 Hours
4.9" x 3.9" x 3.0"


• Forward converter circuit
• High efficiency and reliability
• Low ripple & noise
• Super low noise fan control
• Short circuit protection on all outputs
• Over power protection
• 100% hi-pot test
• 100% burn in, high temperature cycled on/off

Manufacturer Warranty

3 years limited
3 years limited

Quick Info


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

Customer Reviews of the SeaSonic USA SS-300SFD

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  • Charles R.
  • 10/1/2014 9:09:25 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

4 out of 5 eggsPretty Good

Pros: Good solid compact power supply. Fits in my ten year old CHENBRO PC40522-BK Black SECC MicroATX case perfectly. For over a year it has run an AMD Athlon X3 or Phenom X3 just fine on an AMD 780G chipset board, powering two HDD and 4 fans. Given me no trouble until...

Cons: Not Haswell Ready :-(

Upgraded to an Intel i3 4300 on an GA-H81M-DS2V mobo and, well, everything is okay until I start to play World of Tanks, then it crashes. Admittedly this is probably beyond the design scope, so I can't really complain. Don't know if it just needs those extra four pins for the CPU 12v power (it's got just one 2x4 connector, the board can take two connectors), or it's just the sheer power drain.

Other Thoughts: Has one cable with two SATA power connectors, but two molex cables with oodles of connectors...don't know why they think they need so many molex. With one HD, one SSD, and one DVD, i had to get a molex to SATA power adapter, no big deal. Also, no pci-ex power connector, but then again, just got a molex adapter.

I've upgraded to the SILVERSTONE ST45SF 450W SFX12V 80 PLUS bronze and it's the little pwrsup that could.

Did you find this review helpful? Yes No

  • Anonymous
  • 8/29/2014 7:30:23 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

1 out of 5 eggsreview update do not trust this psu

Pros: worked great when it worked. stable voltage . warning !!!!

read other thoughts

Cons: burnt out motherboard. two router lan socket even the inputs on my 42inch lcd monitor

Other Thoughts: i was using this with a intel 35w cpu setup. the max wattage it used was 66watts. it was a security camera server DVR on all the time 24/7
I came home the other day it was 96f in the room where this was setup and the computer was off .

to make a long story short. the computer was burnt out, even the lan socket and the lan socket next to the one this computer was connected to non functional on a asus ac66 router burnt out . the 42 inch lcd monitor inputs are all burnt out. this power supply cost me a fortune.

i have 2 security dvr's one has a pc power and cooling power supply next to this one and all fine no problem

i always used pc power and cooling power supplies and they not failed me even under extreme heat conditions over 100f .very sorry i didn't this time with this computer. am i upset what you think ? fuming mad want to sue seesonic

i know it not the best being its a non standard form factor still seesonic is a good brand and this never should have happened.

i have even used cheepo power supplies $16 real cheepos didn't even do this. yes they failed but with out damaging anything

i so upset about this you have no idea and have lost faith

i do have seesonics fanless top ratted power supply and its one of the best . it works way beyond it ratted specs even in extreme temps and confirmed by many professional reviews. i wanted as small of a footprint as possible with mini itx case and this power supply.

it not worth it, going back to cases that use standard power supplies. it would have been one things if this power supply just failed but for it to burn out my 42inch lcd monitors inputs. the monitor works just the inputs are burnt out and the routers ports the computer was plugged into. come on. this power supply can not be trusted and is garbage

i suppose if you have ac on all the time and keep temps under 80f it will be fine otherwise don't buy this power supply.

Manufacturer Response:

Hi, this is a very strange review considering you say the power supply also damaged your router & inputs on your monitor. Our power supplies come with the necessary protection features to safeguard your PC components.

But, if you are unfortunate to have a lightening strike or some other aggressive AC surge, then it is possible the PSU cannot protect your system components. I kindly ask that you start a RMA with Sea Sonic USA and we will test your power supply for you. If you have any questions, please contact me at Thank you.

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

  • David B.
  • 6/18/2014 5:37:44 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsLasted 1 Month

Pros: Quiet, Installed in a HTPC and worked fine for that.

Cons: Worked great for a month. Now dead, wonderful.

Manufacturer Response:

HI David, sorry for the inconvenience. Please kindly visit for RMA support or as it is a new purchase, you can as well do the RMA via NewEgg. If you have any questions, please contact us at Thank you.

Did you find this review helpful? Yes No

  • Nathan M.
  • 5/4/2014 7:46:46 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsGreat *replacement* PSU

Pros: Compact, solid, high quality, very efficient. Fit into a Silverstone SG05 case great.

Cons: Knocked off an egg because this is best as a *replacement* PSU. What arrived was just the PSU. No screws to bolt it to a case. No power cord to connect it to the wall. If you've built a ton of boxes, you have screws/cords to spare.

But, if you're building a very first computer, I recommend a different model that comes with all the parts.

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

  • Hannu A.
  • 4/25/2014 8:29:36 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsGood when it workes

Pros: Silent

Cons: First one did not boot up the computer. It turned power on and then off after about 5 seconds. Sat dead for about 15 seconds, then turned power on again, only to turn it off again after 5 seconds. Over and over. Returned it at my expense. The second one works fine though.

Manufacturer Response:

Hi Hannu, Sorry for your PSU experience. The reboot situation sounds quite strange. Was it possibly a connector not properly fitted to cause a short circuit? I am glad the repalcement unit worked fine. If you have any troubles in the future, please let us know at: Thank You.

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

  • Sandra S.
  • 2/20/2014 3:18:07 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsSimply amazing effiency

Pros: Cables are quality


Very efficient

Cons: Slightly too tall for my silverstone htpc case. I was able to use it but you could tell it needed to be about .5mm shorter (if that)

Other Thoughts: The system idles at 22-24W once the hard drive spins down and the cpu slows its self down.

I am using a Trinity A4 APU and while streaming HD video from my server, it does not go over 30 watts. This is amazing because the same apu was installed in my server and it would idle higher (45W). The itx board and this psu really made a difference.

The build quality is top notch. While the cables are not sleeved, they feel sturdy and secure.

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

  • Anonymous
  • 1/16/2014 7:22:25 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsIt fits in a mini-ITX!

Pros: Compact with quiet operation. Leaves plenty of room in a mini-ITX case.

Cons: Too many power cables for a small form factor box. Not much room in those, so the "spaghetti" really blocks much of the view.

Other Thoughts: Great value!

Did you find this review helpful? Yes No

  • Joseph W.
  • 12/6/2013 6:47:11 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsReplacing a ReadyNAS Pro 6 Business Edition PS

Pros: I had read where this was a good replacement for the Seasonic ReadyNAS Pro 6 PowerSupply and indeed it looks about the same.

Cons: If you are replacing a ReadyNAS Pro 6 power supply, it is possible that the ATX power supply cables (24 pin) may not be long enough so you need to get a 6" extension which I found all over. Otherwise it's identical and it's nice to be able to get replacements!

Other Thoughts: I bout a couple extra, they are dirt cheap power supply replacements for the ReadyNAS Pro Line (older line than the new 516 series) .. Piece of mind

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

  • Charles R.
  • 9/25/2013 6:40:53 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year

5 out of 5 eggsNot Bad

Pros: Small, quiet, has enough power adapters for what it does. If it doesn't have enough cables for you, or they are too short, you need a bigger PS. This is great for a small desktop/HTPC application, but not anything bigger.

Cons: It died,after 4.5 years. Since I'm an unreasonable jerk I expect my PS to last forever,and I get ticked off when they don't.

Other Thoughts: I bought a prior model ( SeaSonic ECO 300 300W SFX12V, Item#: N82E16817151058) in April 2009 and it lasted until now. 4.5 years is not bad, considering it supported two hard drives, a DVD drive, a discrete graphics card (fanless) and multiple fans, all in a hot, dusty, under-desk enclosure. Since summer 2011 it's been on an MSI 880GMA E55, with an AMD Phenom II X3 720 Heka 2.8GHz 95W.

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

  • Matthew K.
  • 11/21/2011 8:30:37 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsGreat Efficient ATX PSU for Low Power Systems

Pros: Surprisingly efficient at low loads for an ATX PSU.

Great pairing for any low power system (I used it with an E-350 board)

Cons: Wires are a little short. (probably because its originally intended for compact systems) I was forced to stop mid-build and go out and find a 12V ATX motherboard power extension as it simply would not reach in the NZXT Source 210 case I was using. Other cables were a little tight as well.

Odd design requires first attaching a bracket in order to fit it into a standard ATX case. This bracket is included though.

Other Thoughts: Seeing that there isn't much else out there with this efficiency at low loads, I would probably buy this PSU again, despite the shortness of the cables

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

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