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XFX Pro 850W Black Edition Single Rail Full Modular 12V 70A 24PIN ATX PSU 80+ Gold Cert

XFX Pro 850W Black Edition Single Rail Full Modular 12V 70A 24PIN ATX PSU 80+ Gold Cert - 1
Actual product may not be exactly as shown.
XFX Pro 850W Black Edition Single Rail Full Modular 12V 70A 24PIN ATX PSU 80+ Gold Cert - 78945_l.jpg Customer Photos (0)

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Reg. Price: $174.99  CAD
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   Shipping Weight:   7.6 lbs
   Part #: P1-850B-BEFX

Features    [ Edit | History ]

Unique, continuous EasyRail™ technology enables you to maximize available power and make set-up easy. Stack numerous power-hungry components without fear of crashing. It's also a perfect solution for hardcore gamers.
Quick Specs:
Package Contents
  • ProSeries 850W PSU
  • AC Power Cord
Efficiency 90%
Input Voltage 110 V AC 220 V AC
Output Power 850 W
Limited Warranty 5 Year
Output Voltage 3.3 V DC @ 25 A 5 V @ 3 A 12 V DC @ 70 A -12 V DC @ 800 mA 5 V DC @ 25 A
Form Factor Internal
Height 3.4"
Width 5.5"
Depth 6.3"
Number of Fans 1
Green Compliant Yes
Green Compliance Certificate/Authority 80 Plus Gold
ATI CrossFire Supported Yes
NVIDIA SLI Supported Yes
Number of +12V Rails 1
Modular Yes

Specifications    [ Edit | History ]
General Information  
     Brand Name: XFX
     Manufacturer: XFX Technologies, Inc
     Manufacturer Part Number: P1-850B-BEFX
     Manufacturer Website Address:
     Product Name: ProSeries 850W PSU
     Product Series: Pro
     Product Type: ATX12V & EPS12V Power Supply
     Receptacles: 1 x 20+4pin ATX Motherboard
1 x 4+4pin ATX12V Motherboard
6 x 6+2pin PCI-E
10 x Serial ATA
5 x 4-pin LP4 Peripheral Device
1 x 4-pin SP4 Floppy Drive
     Green Compliance Certificate/Authority: 80 Plus Gold
     Green Compliant: Yes
     Package Contents:
  • ProSeries 850W PSU
  • AC Power Cord

Physical Characteristics  
     Color: Black
     Depth: 6.3" (160 mm)
     Form Factor: Internal
     Height: 3.4" (86.4 mm)
     Width: 5.5" (139.7 mm)
Power Description  
     Input Current: 11 A @ 110V
5.50 A @ 220V
     Input Voltage: 110 V AC
220 V AC
     Input Voltage Range: 100 V AC to 240 V AC
     Input Voltage Type: AC
     Number of +12V Rails: 1
     Output Power: 850 W
     Output Voltage: 3.3 V DC @ 25 A
5 V DC @ 25 A
12 V DC @ 70 A
-12 V DC @ 800 mA
5 V @ 3 A
Technical Information  
     ATI CrossFire Supported: Yes
     Efficiency: 90%
     Modular: Yes
     Number of Fans: 1
     NVIDIA SLI Supported: Yes
     Power Factor Correction (PFC): Active
     Protection Type: Over Power
Over Voltage
Over Current
Short Circuit
Over Temperature
Under Voltage
     Limited Warranty: 5 Year

XFX P1-850B-BEFX Customer Reviews

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding XFX P1-850B-BEFX reviews.
Experience: 2 Days
 Verified Owner
Fully modular, less clutter with cables. Stable under load.
SATA power cables are too short for my case/mobo!
I have a Fractal Design Define R4 Black Pearl.

I have 6 SATA HD and two optical drives.
The SATA power cable with two connectors is too short altogether: if I use it for the optical drives, it's about 4 inches too short.
If I use the 4 connectors cable, one of the connectors becomes unusable because of the distance between the optical drives and the HD and I had to use the ATA cable with an adaptor to power my top optical drive.

I purchased a new PSU because I wanted to have a nice, clean and easy to maintain setup. Unfortunately, it won't happen with this case/mobo/psu...
Looked around for custom cables and the prices are crazy. Emailed XFX support and awaiting reply.

Experience: 2 Days
 Verified Owner
Looks nice?
stopped powering my motherboard, Coil whine
Bad experience with this psu, experienced coil whine which I couldn't stand, and shouldn't be an issue with a good quality psu.
Apparently Seasonic oem based psus have this problem often so I now avoid them.

I then turned the psu off and it would not power up my motherboard again after that. I reinstalled my old coolermaster psu and everything worked again.

NCIX refunded me with no problems.

I now have a BeQuiet powerzone psu and that is miles ahead of Seasonic.

Chuck Norris
Experience: 1 Weeks
Very efficient and good for the price
Very satisfied with this purchase. This will pretty much be able to support and dual gpu builds at the moment. This unit is also manufactured by Seasonic, one of the most reliable and reputable manufacturers for power supplies.

Experience: 60 Days
full modular
Fully modular. cable management was easy.

Experience: 1 Weeks
 Verified Owner
L'alimentation est tres bien concue quand je les eu en main j'ai tout de suite vue la qualitée du produit. Nous savons tres bien que Seasonic est en arriere des ce PSU a achater sans probleme.
En gros, je suis vraiment satisfait de mon achat, le meilleur power supply que je me suis procuré a vie.

Experience: 1 Months
Fully Modular
80Plus Gold
Active or hybrid fan mode
Flat Cables
A minimal amount of coil wine-only audible when computer is asleep
Weird 24 Pin Motherboard connector (half of the 20 Pins in the top group, 4 Pins in the bottom group
This is a great power-supply.
With it having the active or hybrid fan mode (so when your computer is idling or doing minimal load, the fans off) it's a very nice and quiet PSU (can't be heard over over fans).
The cables are fully black (not sleeved black, the cable's plastic coating is black) and are flat.
The problem is that the 24 pin mother board connect is sleeved, and not flat, but it still uses the black cables which is nice.
Also, for some reason, 20 Pins of the main connector connect to the top row of connectors, yet the last four pins connect to the bottom row on the PSU. Weird
Each PCI-e connect has two 6+2 pin connectors on the ends, making it possible to run almost every card off a single cable.

All and all its a very nice power-supply that's quiet, flexible, and efficient. Plus, it's one of the cheapest power-supplies (in price, not quality) that is fully modular and 80 Plus Gold.

Experience: 1 Days
 Verified Owner
Fully modular, GREAT cable management
wasn't free? :D
Fully modular, easiest cable management I've ever done, I have alot more space in my case and it's quite awesome, no more zap-straps.

Experience: 2 Days
 Verified Owner
Outstanding Quality for a Seasonic KM3 Clone with what appears to be a Corsair Classed Casing and Painted Richly.

Really nice Ribbon Cables - Tad Stiff but no problem.

I think XFX has a Winner here with their BBEFX Series
I bought it last week on a NCIX Weekly Special for $119.49 - Thank you NCIX ;o)

Somewhat overpowered for my range but at that price the PSU will operate with Platinum Efficiency and provide me with the option to expand.

You can tell it has Quality just by the Weight and Finish.

I can't see spending $50 or $80 more for a KM3 Seasonic or Corsair when you get the Identical Unit from XFX with a 5 Year Warranty.

It doesn't come with the Velvet Bags but the Packaging is more then adequate.

I actually received my order before PayPal withdrew my payment from my Bank Account and the shipment was delayed one day due to a Winter Storm.

ASUS P8Z68V-Pro Gen3 / i7 2700k / EVGA 280GTX / 16GB Samsung MV-3V4G3D-US / 2 500GB 7200 WD Black Raid-0 / Smaller BackUp HDD (Looking at Future purchase of a 256GB SSD and Swiftech H220 with possible faster Video Card. I'm more into Video Encoding then Gaming :o)

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Messages about XFX Pro 850W Black Edition Single Rail Full Modular 12V 70A 24PIN ATX PSU 80+ Gold Cert

is that this power supply is compatible haswell (Voltaire- Jun 20, 14, 1 Replies) Read this message

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Product Warranty
NCIX provides a 30 day limited warranty on this product.  The remainder of the 1 year warranty is provided by the manufacturer.    Warranty length may vary depending on manufacturer and product.

First 30 days limited warranty through The remainder of the warranty is provided directly by the manufacturer.

  • Standard 2 Year Warranty on all VGA products
  • Modder Friendly – Please check full terms for details.

For more details, Click here.

Power Supplies:

XFX Power supplies warranted for 5 years must be registered within the first 30 days.  If not registered within 30 days, the standard warranty length is 2 years

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