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Rosewill Xtreme Series 850W 80 PLUS Certified Power Supply ATX12V / EPS12V 850 Power Supply RX850-S-B

3.8 out of 5 stars 34 customer reviews

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850 Watt
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  • Supports ATX12V v2.2 & EPS12V v2.91 standards
  • Supports both Intel and AMD Systems
  • Single 12V rail provides reliable power
  • SLI & CrossFire Ready - 4 x 6+2pin Connector
  • 1 x Silent 135mm Ball-bearing Blue LED Fan with Auto Fan Speed Control
  • Mesh sleeving on all cables for easier cable routing and better ventilation
  • Over Temperature / Current / Voltage / Power Protection, Under Voltage Protection, and Short Circuit Protection provide maximum safety to your critical system components
  • Safety & EMI Approval: UL, TUV, CE, FCC, ROHS
1 used from $45.99

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Product Description

Size: 850 Watt

In a computing world of new video and audio cards, add-ons, higher-powered chips and more, the search for power goes ever on. Rosewill's RX850-S-B satisfies your power-hungry virtual instincts, and keeps you running at your best. Clad in a sleek black shell, lit within with a cool blue light, the impression is one of cool, secret power, ready to do your bidding! Four 12 volt rails deliver power to a myriad of connectors ready to attach to any and every accessory you've stuffed into your case! This compact powerhouse will run everything even up to 2 SLI-equipped GeForce 8800GTX cards! Active Power Factor Correction provides clean and reliable power to all those pieces, and temperature, current and voltage protection circuits make sure everything stays healthy. Run with the big boys with Rosewill's RX850-S-B PSU, and know you've got ergs to spare!

Product Information

Size:850 Watt

Technical Details

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Brand Name Rosewill
Item model number RX850-S-B
Item Weight 6.8 pounds
Product Dimensions 6.2 x 5.9 x 3.4 inches
Item Dimensions L x W x H 6.22 x 5.91 x 3.39 inches

Additional Information

ASIN B004GL8UU6
Customer Reviews
3.8 out of 5 stars 34 customer reviews

3.8 out of 5 stars
Best Sellers Rank #1,575 in Computers & Accessories > Computer Components > Power Supplies
Shipping Weight 7.5 pounds
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available December 17, 2010

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Richard T. Wright on October 10, 2013
Size: 850 Watt Verified Purchase
I bought this power supply for a new build. After one day, I started having problems with Windows crashing about a minute after booting up. After doing a bit of reading, I found that this particular PSU has a common problem: the voltage fluctuates after any amount of use, and you can tell if this is a problem with your unit if the LED in the fan starts blinking. Sure enough, when I started having problems with Windows again, the LED was blinking erratically.
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Size: 750 Watt Verified Purchase
Bought this brand new and it did not work. For an expensive power supply, I would expect it to at least do something. I had to revert to using an old power supply instead. It provided no power at all, even after a long time of trying different things with it. Disappointed.
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Size: 850 Watt
I gave it one star because there's nothing less, what a piece of junk, it worked for 10 min. than when I returned it to Rosewell and was promised another would be sent, I found out that I was being refunded my cost of the power supply, but not my money shelled out to return it to them, $27.35 when I called to ask what happened to the other one they were going to send I was told ..."too late, money for item was already refunded", when I asked about being out $27.35 , I was told nothing could be done even though they "understood"...what a bad company and product, don't waste your time and money.
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Size: 750 Watt Verified Purchase
I put in this power supply and all my computer lockups and sluggishness were solved. Now my computer is awesome. I read some of the bad reviews from other people having problems but decided to take a chance. I've had the supply for 4 months and have had zero problems. I recommend this to people looking for a power solution at relatively low cost.
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By Paytron5000 on October 19, 2013
Size: 850 Watt Verified Purchase
Rosewill has always made good products, this is one of them. this powers my entirely system flawlessly with some power to spare. the fan is quiet and it stays cool. i keep it clean and it does a great job. plus the blue leds match everything i have. i give it 5 stars it does its job perfectly.
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Size: 750 Watt Verified Purchase
UPDATE 6/21/14: the rosewill 750w PSU worked great with BFG GeForce GTX 260 OC MAXCORE 55 untill i updated my GPU to a EVGA GeForce GTX 660 SIGNATURE2 3072MB GDDR5 DVI mHDMI DP Graphics Card 03G-P4-2667-KR. normal use is fine but when you get into gaming it shuts the pc off with out warning.

this PSU is over rated. dont get a Rosewiill PSU if your serious about your build

Build:
MB-Striker II Formula
CPU-Intel Core 2 Quad Q6600
GPU-EVGA GeForce GTX 660 SIGNATURE2 3072MB
RAM-4X2G G.Skill PI Black Series
HDD-WD Red 1 TB NAS
EHDD-WD My Passport 1TB
SC-Supreme FX II
PSU-Rosewill Xtreme 750w

yes my build is old but i have been upgrading this boad and now have it maxed out. this Rosewill 750w was part of my new build. but looks like i will have to upgrade PSU again before i can get my new board.
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Size: 850 Watt Verified Purchase
Do not buy. Plain and simple. I had it for about a month before it started giving me problems. It kept causing my PC to crash due to an over voltage. Computer would not stay on for more than 5 minutes before freezing up, or just crashing altogether. If you are building an elite gaming rig, spend the money and get something better. Don't waste your time.
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Size: 850 Watt Verified Purchase
Looks great, sounds great, not even a problem. Booted up my new build first time with solid power and solid parts.

Build:

AMD Fx-8350 8 core
Nvidia Gt 660ti
NZXT H2
Stock cooler
Gigabyte 990fx-Ud3
Seagate Barracuda 1tb
8gb Corsair Vengeance RAM
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