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Item#: 9SIA4S82BP8917

XFX PRO850W XXX Edition Semi-Modular 80 Plus Silver Certified 850 Watt Active PFC Power Supply

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Conventional PSUs use multi-rail technology which basically combines cheaper and lower wattage PSUs into one single PSU to generate a higher total wattage. However, smaller rails have lower maximum wattages so left over wattage on individual rails become too small to handle major components and gets wasted.

Unique, continuous EasyRail technology enables you to maximize available power and make set-up easy. Stack numerous power-hungry components, such as your GPU, CPU and other components - without fear of crashing – with XFX ProSeries PSU with EasyRail Technology. In addition, this XXX Edition PSU has been awarded the 80 Plus Silver certification for its high power efficiency and is also designed for NVIDIA SLI and AMD CrossfireX multi-GPU systems, making it a perfect solution for hardcore gamers. One Rail, One Setup.

  • newegg EasyRail Technology XFX ProSeries PSUs with EasyRail Technology give you one continuous rail of power covering the total maximum wattage. What this means is that no matter how many devices you have, high or low power, they can easily stack until it reaches the full maximum wattage. With EasyRail technology you can maximize the potential of your PSU with ease.
  • newegg True Wattage Guarantee Wattage and heat go hand-in-hand. Other PSUs claim a certain wattage by using unrealistic testing environments, but in real settings, they might reach much lower wattages. XFX PSUs guarantee the advertised wattage, even at well above standard operating conditions at 50°C.
  • newegg Efficient Power Use 80 Plus Silver certified means that this XFX PSU has up to 88% power efficiency. Compare that to non-certified PSUs, which lose at least 20% of power drawn. With the XFX PSU, get every watt you pay for.
  • newegg Extreme Heat Tested Capacitors Internal PC operating temperature is around 35°C but the internal PSU temperature can be much higher. XFX uses high-quality Japanese brand capacitors rated to withstand up to 105°C. While some competitors claim to use Japanese capacitors, they may only be rated for 85°C, which can shorten the usable life of a PSU.
  • newegg Clean Power Power drawn from your AC outlet is typically dirty with voltage spikes and fluctuations, which can harm vital PC components. XFX PSUs are designed to deliver tight DC voltage regulation with minimal AC ripple, giving you safer, cleaner power.
  • newegg High +12V Output & Multi-GPU Technologies Supported The 850W XFX ProSeries XXX Edition semi-modular PSU features DC to DC converter design and a high +12V output of up to 70A to ensure the maximum compatibility and provision of 12V power. It is also AMD CrossfireX ready and NVIDIA SLI Ready certified and comes with 4x PCI-E 6+2-pin connectors, allowing you to build your ultimate multi-GPU gaming power house.

Learn more about the XFX P1-850B-NLG9




Maximum Power
1 x 135mm Ball Bearing Fan (Black)
Main Connector
+12V Rails
PCI-Express Connector
4 x 6+2-Pin
SATA Power Connector
SLI Ready
CrossFire Ready
Up to 88%
80 PLUS SILVER Certified
Over Voltage Protection
Input Voltage
90 - 264 V
Input Frequency Range
50/60 Hz
Input Current
12A @ 115V, 6A @ 230V
+3.3V@24A, +5V@30A, +12V@70A, -12V@0.8A, +5VSB@3A
6.7" x 5.9" x 3.4"


1 x Main connector (20+4-pin)
1 x 4+4-pin ATX 12V
1 x 8-pin EPS12V
8 x Peripheral
8 x SATA
2 x Floppy
4 x PCI-E
Solid State Capacitors

High Reliable 105°C Japanese Capacitors

Over current protection

Over power protection

Under voltage protection

Short Circuit Protection

Tight voltage regulation (±5%)

Modular SATA: Up to 11 Connectors

Quick Info


  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years

Customer Reviews of the XFX P1-850B-NLG9

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  • Uriel E.
  • 7/27/2013 5:43:55 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsLove this PSU no issues

Pros: Great PSU does everything. Very quite I have it running 24 hours a day for over a year

Cons: Not fully modular

Manufacturer Response:

Thank you for the great review! If you ever have an issue with this PSU, or a question, please contact our XFX Support team at

Play Hard!

Did you find this review helpful? Yes No

  • jeffrey k.
  • 6/8/2013 8:44:43 AM
  • Tech Level: Average
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsXFX PRO

Pros: This power supply rocks.......runs my gaming comp and has plenty to spare.

Cons: none

Other Thoughts: VERY HAPPY

Did you find this review helpful? Yes No

  • Kyle G.
  • 4/23/2013 7:55:51 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsDying fan

Pros: Semi modular
Never had any power related issues
Looks good in the case

Cons: After owning the PSU for about 3 months, it developed a very irritating fan ticking noise. I understand that occasional lemons will slip through the cracks, but a quick google shows that this seems to be a pretty common problem with XFX's XXX series. Whether they cheaped out on the fan, are slipping in quality control, or this is just a widespread fluke, I couldn't say.

But I do know that I can't eat the 2-4 weeks of RMA downtime when my income relies on working from home. If XFX could implement an advanced RMA policy similar to EVGA or Corsair, that'd be swell.

Also, the cables feel a bit too short, but my case is huge so that isn't entirely their fault.

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

  • Ben C.
  • 3/30/2013 10:55:38 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year

5 out of 5 eggsExtreme power

Pros: I was lucky to stumble on this on a 1-day sale at for $100 a few weeks ago. My old 850w psu wouldn't even turn my new computer on. I didn't know that other psu features matter besides the wattage. My old psu only had 15a on the +12v rail, this psu has 70a. So far it's been more than enough to power my Intel 4core cpu, tv tuner card, 2gb 256-bit pcie3 video card, wifi card, 35ft hdmi cable, & other things all at the same time flawlessly.

Cons: none

Did you find this review helpful? Yes No

  • David M.
  • 3/5/2013 9:45:00 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsThe Way to go

Pros: Everything, I Bought this PSU in dec 2011 and boy, what a great choice I made. Not a single complain from my end.

Cons: NONE!

Other Thoughts: If you need a grear PSU for SLI or Firecross, this is a good contender.

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

  • Parker C.
  • 12/28/2012 8:12:23 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsAwsome PSU!

Pros: Awesome PSU. Does what it's supposed to. Cables have nice and thick casing. The unit is made of solid material. Great power-on-demand feature, using less power on this than my old smaller wattage PSU.

Cons: Wasn't free?

2 out of 3 people found this review helpful. Did you? Yes No

  • Cory I.
  • 12/12/2012 11:04:02 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsA great PSU

Pros: Great adapter choices, the non modular cables they come with are rather good choices though i did not have to use all of them. the price was well worth 4 eggs.

Cons: cables were really stiff and the power supply its self is rather big.

Did you find this review helpful? Yes No

  • Nathan T.
  • 11/22/2012 2:40:50 PM
  • Tech Level: Average
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsFlawless

Pros: +No noise whatsoever (no fan noise either). I spent a lot of time finding a PSU that was completely silent.
+Never had any problem. (Has resided in multiple houses, one being very old with subpar currents..lights flickered but computer didn't show any issue)
+Fully modular
+Single rail (no worries)
+Sleeved cables
+Great packaging
+Styling of PSU is perfect
+Future proof
+Fan is so silent the only indication that it's running is a small amount of dust in my filter after 1 year!
+Very solid/high quality feel
+Smells great lol
+Plethora of extra cables

Cons: -Cables are somewhat stiff
-Not a big deal but each cable has stickers on it that I cut off to have a clean look..leaves small amount of residue on the sleeve which collects dust

Other Thoughts: -Would have been nice (although I've never seen it on a market PSU) to have every individual cable sleeved

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

  • 8/10/2012 7:39:37 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsCant Complain

Pros: Alot of connectors which is somthing i have yet to expirience, was able to connect a couple of fans from my old box into this new one because of how many extra Plug-n-play connectors it has, so far its really nice waiting to get my GTX 580 so i can enjoy battlefield 3 a little bit more, will update after ive installed the new card and see how this beast of a power supply holds up

Cons: none so far

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

  • Nathaniel J.
  • 5/19/2012 5:57:22 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsDon't even hesitate, get this!

Pros: Oh-Mah-Gahwd so many connector options.You can not go wrong with this powerhouse. Worked perfectly with the NZXT Phantom case, as far as being able to manage the wire lengths, and thats saying alot, considering the Phantom is gi-normous. Just click add to cart already.

Cons: Something made by Seasonic with a con? Don't even think about it...

Other Thoughts: Though technically a hybrid modular, as your main power connectors are not interchangable, this thing has everything you could need, if not already attached to it, then all the extras it comes with with have what your looking for.

Manufacturer Response:

We are glad to hear that you are enjoying your purchase. If you ever have any questions about your product then please contact our support staff at Thank you.

8 out of 8 people found this review helpful. Did you? Yes No

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Item#: 9SIA4S82BP8917
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