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Condition: Used: Very Good
Comment: Plain Box Package includes Cooler Master M850 Semi-Modular PS, Power Cord, (Modular Cables NOT INCLUDED)
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Cooler Master Silent Pro M - 850W 80 PLUS Bronze Power Supply with Modular Cables (RS850-AMBAJ3-US)

4.7 out of 5 stars 158 customer reviews

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850 Watt
  • Max. Output Capacity: 1020 Watts
  • Type: Intel ATX12V V2.3 / SSI EPS 12V V2.92
  • PFC (Power Factor Correction): Active PFC
  • Fan Type: 135 mm ultra silent fan
  • Connector: 1x 20+4pin Main Connector
2 new from $236.99 1 used from $47.33 2 refurbished from $84.77

Technical Details

Size: 850 Watt
  • Brand Name: Cooler Master
  • Model Number: RS850-AMBAJ3-US

Product Description

Size: 850 Watt

Product Description

Cooler Master Silent Pro M RS850-AMBAJ3-US 850W ATX 12V 80Plus Bronze & SLI Power Supply

From the Manufacturer

Cooler Master Silent Pro M Series Modular 850W 80 PLUS Bronze Certified Active PFC Power Supply RS850-AMBAJ3-US
Cooler Master adds M850 and M1000 to the Silent Pro series, giving extreme overclockers and/or ultra high-end systems all the power they need. With up to 80A on a single 12V rail, these power supplies deliver where it counts and won�t have any problems powering even the most demanding multi-graphic card systems. These units feature flat modular cables for improved airflow and cable management. It also comes with shock absorption silicon pads to remove possible vibrations.


  • Copper plus aluminum heatsink for efficient heat dissipation.
  • Japanese-made capacitors to enhance PSU outputs stability.
  • Compliance with the newest Intel standard ATX 12V V 2.3 and SSI standard EPS 12V V2.92.
  • Flat modularized cables to eliminate the clutter and improve airflow inside the chassis.
  • Ultra-silent operation with intelligent 135mm fan speed control.
  • Unique silicon pad eliminate the vibration.
  • Eco-design for energy and money saving by Active PFC.(>0.99) / high efficiency (>85%).
  • Single +12V rail for up to 80A for high demanding SLI.



Hybrid heatsink

Rubber pads

Fin type design
 

Japan-made Capacitor

Single +12v rail

Protection for OVP / UVP / OCP / OPP / OTP / SCP / OLP
 

Flat modular cables
 

CPU 4+4 Pin x 2

Motherboard 20+4 Pin x 1

SATA x 9
 

Floppy 4 Pin x 1

PCI-e 6+2 Pin x 6

Peripheral 4 Pin x 6


Model RS850-AMBAJ3-US
Type Intel ATX12V V2.3 SSI EPS 12V V2.92
Dimension 5.91(W) x 3.39(H) x 6.5(L) (inches)

150(W) x 86(H) x 165(L) (mm)
Input Voltage 90~264V (Auto Range)
Input Current 12A@115Vac, 6A@230Vac
Input Frequency Range 47~63Hz
PFC Active PFC >0.9
Power Good Signal 100~500ms
Hold Up Time >17ms
Efficiency 85% Typically
MTBF >100,000hrs
Protection OVP/ UVP/OCP/OPP/OTP /SCP
Output Capacity 850W
Max. Output Capacity 1020W
Operation Temperature 0~40°C (Nominal Input Voltage)
Regulatory TUV / CE / GOST / C-tick / UL / FCC / CCC / BSMI
Fan 135mm ultra silent fan
Certification SLI / 80 Plus Bronze
Connector M/B 20+4 Pin Connector x 1
CPU 4+4 Pin x 2
PCI-E 6+2 Pin x 6
4 Pin Peripheral x 6
SATA x 9
4 Pin Floppy x 1
Warranty 5 years
UPC Code 884102005978

Product Information

Size:850 Watt
Product Dimensions 6.5 x 3.4 x 5.9 inches
Item Weight 7 pounds
Shipping Weight 8.2 pounds
Manufacturer Cooler Master USA, Inc.
ASIN B002RWJGC2
Item model number RS850-AMBAJ3-US
Customer Reviews
4.7 out of 5 stars 158 customer reviews

4.7 out of 5 stars
Best Sellers Rank #2,934 in Electronics > Accessories & Supplies > Audio & Video Accessories > Cables & Interconnects > Power Cables
#25,481 in Electronics > Accessories & Supplies > Home Audio Accessories
#43,552 in Electronics > Accessories & Supplies > Cables
Date first available at Amazon.com September 14, 2004

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Rene L. Alfaro on December 24, 2009
Size: 1000 Watt Verified Purchase
this is a well made psu from Cooler Master with a lot of connectors, long cables for full tower cases overall this is a good psu for modding I suggest this if you are a modder, cables are really easy to modify.
Runs cool and is very quite I barely hear the psu running :).
I receive the 850 watts version instead of 1k. Amazon responded really fast with the return, I'm in love with amazon :) your costumer service is excellent.

This PSU powers:
AMD Phenom II 940 deneb 3.0 Ghz OC to 3.8
8 Gigs of ram
80 Gigs x 4 HDD
4 Fans with LED's
X-fi xtreme music
HIS ATI Radeon 5850 x2
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Size: 1000 Watt Verified Purchase
Unlike some of the other reviewers said, I received the 1000W model which I ordered. If there was a problem, it has been solved. This power supply is modular except for the 24pin and 4/8pin power, and the modular cables are flat, which helps with cable management. This is powering my build comprised of the i7-930 overclocked to 4.0GHz, 6GB of 1600MHz RAM, an HD 5850, 6 HDDs, 4 case fans, and 2 Scythe fans for my Corsair H50 cooler.

This component is the quietest in the whole setup! And I know it will handle the Crossfire setup I'm eventually installing. The price is nice for the wattage, and it is efficient to boot. It has no LED lights on it, which works out perfectly as I am too old to want a light show in my case. The only problem I had was with registering the product, as Cooler Master's site is hard to navigate. The registration page will come up with a Google search.
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Size: 850 Watt Verified Purchase
My system runs well with this power supply (the 850 watt version). Here's a list of pro's and con's about it.

Pro's
-The power output rating on this power supply is accurate, meaning it does provide as much power as it says it does.
-It stays very cool and quiet. In fact, it stays so quiet that I've had to check a few times to see if the fan was still spinning (and yes, it was running each time).
-It has plenty of power connectors, as well as different connectors on different wires. For instance, one of the SATA cables has only 2 connectors, the second one has 3 connectors, and the third one has 4 connectors. Use this feature wisely to give the case the best cable management.
-It is heavy, showing that it is made with good parts. My experience shows that the heavier the PSU, the better the quality.
-The 8 pin +12 volt CPU connector (it has 2 of those, totalling 16 pins) is well long enough to reach from the bottom of my Cooler Master Elite 430 case to the top of the motherboard, routing the cable around the motherboard so it is out of the way.

Con's
-The cooling was NOT what I was expecting to get. The page shows some finger-style coolers for the MOSFET's and diodes, but the coolers in the PSU that I received are the standard vertical fin-type. I hope that it can stay cool enough with those.
-The size is different than what was stated. Amazon said that the PSU was only 5.5 inches long (which is what I needed), but in reality, the unit is 6.5 inches long. If you have the same case as I do, you know how much of a pain this is. There is a 120mm fan that fits right next to the PSU on the bottom of the case. I had to remove this because the PSU's length was listed wrong.
Read more ›
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Size: 850 Watt Verified Purchase
Ordinarily I'd be giving this five stars. It works perfectly and is too quiet to be heard over other things in my lounge.

So what's the problem?

I bought this with a Cooler Master HAF 932 case which accommodates this PSU perfectly... at the bottom. Great place for a heavy PSU. Unfortunately the cables are designed for a top mounting location. They expect the first drive to be at the top and the power to daisy chain down. Well these cables won't reach round the back (where the wiring belongs on this case) and then out to the top drive bay. They will reach the bottom drive, but then either you can't connect the others or you have to twist the cable round so it can hook in upside down. That leaves the rest of the connectors hanging down and that's no good for powering the other drives. So now what? Well fortunately people make extensions and converters from standard cables, so I was able to pick up power from a 4 pin Molex (old style drive connector) and use that to power my two DVD drives.
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Size: 850 Watt Verified Purchase
This is a very nice power supply, I don't really need 850W of power, but the reviews, build quality, and modular design were sellers. The fan is ultra-quiet; even with the case open it's just about impossible to hear running. The cost of this power supply compared to some other options makes it a good deal - it was less expensive than several other options.

If I had to offer a downside, I'd say the "flat cables" Cooler Master makes a big deal about are just OK. First, the built-in non-modular cables are round, only the modular cables are flat. Second, the purported benefit of the flat cables is that air will flow around them more easily - I guess if air is blowing directly at the narrow edge and the cable is held straight, this would be true. In a real-life case the cables bend and twist and there is no way to aim keep the flat edge of the cable directly in line with the airflow. The flat cables are also more difficult to tie back than round sheathed cables, and unless done correctly it's possible to get several of the flat cables lined up along their long side significantly restricting airflow - bottom line for me is that after several builds, I'd much prefer the rounded cables.
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