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Seasonic SS-550RM 550W Power Supply


Price: £94.99 FREE UK delivery.
Only 8 left in stock.
Dispatched from and sold by Box Limited.
4 new from £94.99
  • 80 Plus Gold Cerified
  • DC to DC converter Design
  • Smart and Silent Fan Control
  • 12cm Ball bearing fan
  • High Current Gold Plated Terminals
See more product details

Frequently Bought Together

Seasonic SS-550RM 550W Power Supply + Intel Core i7 4770K Quad Core Retail CPU (Socket 1150, 3.50GHz, 8MB, Haswell, 84W, Intel Graphics, BX80646I74770K, 4th Generation Intel Core, Turbo Boost Technology 2.0)
Price For Both: £334.97

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Product Information

Technical Details
BrandSeasonic
Item Weight2.7 Kg
Product Dimensions16 x 8.6 x 15 cm
Item model numberSSR-550RM
Wattage550 watts
Lithium Battery Energy Content550
  
Additional Information
ASINB00918MEZG
Best Sellers Rank 47,356 in Computers & Accessories (See top 100)
Shipping Weight2.8 Kg
Date First Available3 Oct 2012
  
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Product Description

Product Description

The SS-550RM offers outstanding quality, combined with performance of 80 plus Gold Efficiency with top quality performance, advanced fan control, energy savings and a 5 Year Warranty. The SS-550RM is designed for computer enthusiasts and games who will not settle for anything less than excellent reliability, performance and stability.

Box Contains

Power Supply

Customer Questions & Answers

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Most Helpful Customer Reviews

Verified Purchase
It's modular and allows you to plug in a combination of power cables; PCIe, sata. I bought it after reading recommendations on Hardwaresecrets.com, who tested it properly before reviewing. I just wish there were fewer 4-pin power cables and more sata. I use a lot of HDDs and very few modern PC components use the older cables.
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By Madevu on 15 Feb 2013
Verified Purchase
If it wasnt for the fan rotating, you would be forgiven in thinking the unit was still off...

What can one say about power supplies. It gets the job done as quietly and efficiently as possible.
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Most Helpful Customer Reviews on Amazon.com (beta)

Amazon.com: 82 reviews
68 of 73 people found the following review helpful
Silent, stable, efficient, and economical 31 Jan 2013
By D. Alexander - Published on Amazon.com
This is a top-drawer power supply for a system with one powerful graphics card or two mid-range cards. It's efficient, silent at loads under 300W, and delivers clean performance at a reasonable price.

PERFORMANCE:

Fifteen years ago, most power supplies were about 70% efficient. For a 100W load, they would draw about 140W from the wall. Not anymore. We now have five major PSU ratings: 80 Plus and 80 Plus Bronze, Silver, Gold, and Platinum. These correspond to half-load efficiencies of 80%, 85%, 88%, 90%, and 92%. Efficiencies at 1/5 and 4/5 load are about 4% less than half-load.

This is an 80-Plus Gold unit capable of 90% efficiency. Relative to a Bronze unit, for a 24/7/365 system draw of 100W, you could expect to save about $6 a year in power costs at $0.12/kWH. Efficiency has other benefits: namely, every watt that isn't going the system is dissipated as heat. Less efficient units require a bigger or faster fan, which makes more noise.

JonnyGuru and XBitLabs have given this model high marks for load regulation and current ripple. It's a solid design that's par for the course for Seasonic.

NOISE:

Most power supplies have two general characteristics: they're most efficient at half-load, and half-load is when their fans start to ramp up. If you want a silent PSU, your maximum load should be no more than 60% of rated capacity.

Here's the load ballpark for each component:

Quad CPU: 10W idle, 100W sustained
Motherboard: 15W-50W
Hard disk: 15W spinup, 2W idle, 7W sustained
SSD: 1W idle, 5W sustained
Optical: 1W idle, 10W sustained
Video card: 15W-25W idle, 70W-250W sustained
RAID card: 25W
NIC/sound/peripheral card: 10W
120mm fan: 3W

You can expect a typical single-drive system with integrated video to idle around 50W and load to 150W. A mid-range ($200) video card will add 15W to idle and 100W to load. Overlocking can bump the load total by 25% or more.

Most systems spend most of their time at idle. Because efficiency trails off rapidly below 20% load, it's best not to buy capacity well in excess of your needs. This conflicts with the silence objective with most power supplies, so it's a bit of a trade-off: do you care more about fan noise at full load or efficiency at idle?

Theory aside, the G550 (and the G360 and G450) is one of the quietest units I've ever encountered. It's inaudible at low loads unless your ear is pressed to the back. The fan doesn't announce itself until 300W in an enclosure with decent cooling. I did detect a hint of coil whine at idle in Windows and a bit more with the system off or in Standby. Not enough to dock a star; neither is apparent once the system is under my desk. If you're over 30, you probably won't hear it ever.

FEATURES:

The cable layout is like so:

1 x 24-pin motherboard (permanent)
1 x 4/8-pin CPU (permanent)
2 x 6/8-pin PCIe
1 x 4 SATA
1 x 2 SATA
1 x 3 molex
1 x 2 molex

This is a modular power supply with flat, unadorned cables. Modularity means that some or all cables are attached separately so you can pick and choose what you need. This feature becomes more important as wattage goes up.

Cable length is somewhat shorter than the norm, though not to great consequence if you're not overly concerned with winding the excess behind the motherboard.

IN SUM:

This is an excellent supply for a system with a serious graphics card, and where noise performance and efficiency are at a premium. At this efficiency level, the only competitor is Rosewill's Capstone 550M, though it won't be as quiet. If you're willing to roll the dice with coil whine, Corsair's HX650 is often discounted to a price below this Seasonic.
8 of 8 people found the following review helpful
Impressive performance, running 780 GTX/i7 920 16 Oct 2013
By J. God - Published on Amazon.com
Verified Purchase
Owned for a couple months now, pretty impressed with the performance on this 550 watt Power Supply. I wasn't expecting to be able to overclock a 780 GTX and an i7 920 on this, expecting to run into power limit but this does the trick. I knew I was making a good decision getting a nice efficient 550 watt instead of wasting money/energy on a bloated 800 watt model. Very solid.
5 of 5 people found the following review helpful
Excellent Power Supply 28 April 2013
By Sootaek Woo - Published on Amazon.com
Verified Purchase
Super Quiet!! It's little expensive, but it's worth it!
My desktop is super quiet!! If you have stressed out with fan noise, this is the right product for you.
3 of 3 people found the following review helpful
*UPDATED* Have received 2 - both DOA *Now working nicely 12 Mar 2014
By Nuc - Published on Amazon.com
Verified Purchase
*UPDATE: Third time was a charm. The PSU is in a working nicely. It handles the pull on it with no issue and is nice and quiet. It's a shame it took a few tries.

---------------------------------
I bought one of these as a replacement for an old PSU that died. I received the first one and installed it - nothing. I followed their troubleshooting guide and Jump Start procedures - nothing.

I RMA'd the bad PSU and after eventually got a new one via UPS. This was not a fast process.

Silly me took the new one and installed it and - again nothing. I pulled it out and went through Jump Start and troubleshooting again - nothing.

Welcome to bad product and RMA hell.
3 of 3 people found the following review helpful
Affordable; Rock Solid Performance 13 Oct 2013
By Calvin Hodgson - Published on Amazon.com
Verified Purchase
So far this has been running in a new system I got for about 3 months. Old generic PSU I had would make a constant crackle noise between the power cord and where you plug it into the PSU. Decide that I did not want a fire hazard waiting to happen so I got this.

This power supply really does live up to its 80+ Gold certification. Playing games on the old unit there would be lots of heat the would billow out. Now with the SeaSonic I cannot even feel the massive amount of head unless it has been a long time playing games or if it is hot in the room. I don't want to bore you with technical details and I really don't know much about them, but SeaSonic focuses only on Power Supplies. I expect this to last for at least 10+ years before quitting.

System Specs
Intel Core i7-860 2.8GHz 95W
Kingston 8 GB RAM
ASrock P55 Extreme
Windows 8 Pro 64-bit (6.2, Build 9200)
Saphire ATI Radeon 6870

I did buy this from Amazon warehouse deals and it was missing the power cord. Contacted support and they were able to give me a partial refund for the item missing.
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