100 - 240 V 50/60 Hz
100 - 240 V 50/60 Hz
in 5 offers
The lowest price for Seasonic SSR-850FX White Focus GX 850W 80+ Gold Fully Modular Power Supply right now is $227.86 at MegaBuy, compared across 5 retailers.
The all-time low was $182.00 on 3 Feb 2025 — today's price is 25% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 2 Nov 2026.
Seasonic SSR-850FX White Focus GX 850W 80+ Gold Fully Modular Power Supply
100 - 240 V 50/60 Hz
100 - 240 V 50/60 Hz
Last updated at 02/11/2026 23:09:25
[PSUSEAFOCUSWHITE850GXA3] Seasonic FOCUS GX-850 White 850W ATX 3.0 Gold Modular PSU
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Seasonic FOCUS GX-850 White 850W ATX 3.0 Gold Modular PSU
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Seasonic FOCUS GX-850 White 850W ATX 3.0 Gold Modular PSU
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Seasonic FOCUS GX-850 850W ATX 3.0 Fully Modular PSU, 80 PLUS Gold, White
Free delivery between 9–13 Nov
Seasonic Focus Gx-850 White 850w Atx 3.0 Gold Modular Psu
Free delivery
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originally posted on newegg.com
If you know nothing about power supplies, this is a quality option; it isn't cheap, but it's designed to last 10 years or more. Being fully-modular, you are given plenty of cable options: 2 CPU cables (most people will only ever need one), 3 PCIe cables (just in case your GPU setup needs it), at least 2 different SATA cable options for different case sizes and restrictions. (Yes there is a 24pin cable, but there's only one so it's not an option). My favourite feature--it's 80+ Platinum. Based on some cursory math, my still limited understanding of electricity, and the current prices of both PSUs and electricity in my area, this unit should save ME a small sum of money over the 80+ gold version over a period of 10 years. Does this mean it will save you money, no. ... MoreIf you know nothing about power supplies, this is a quality option; it isn't cheap, but it's designed to last 10 years or more. Being fully-modular, you are given plenty of cable options: 2 CPU cables (most people will only ever need one), 3 PCIe cables (just in case your GPU setup needs it), at least 2 different SATA cable options for different case sizes and restrictions. (Yes there is a 24pin cable, but there's only one so it's not an option). My favourite feature--it's 80+ Platinum. Based on some cursory math, my still limited understanding of electricity, and the current prices of both PSUs and electricity in my area, this unit should save ME a small sum of money over the 80+ gold version over a period of 10 years. Does this mean it will save you money, no. Please do your own math because there are a whole host of factors to consider. If you do know lots of stuff about PSUs, I probably can't help you. I have been satisfied with the quality of the components and the ease of building with this PSU. Unfortunately I won't be able to tell you if this thing lasts 10 years, but if you know anything about warranties... Okay I need to go do other things today.
originally posted on newegg.com
I got this just a couple days ago. I only installed it today as I had the opportunity to do so. However, when I started my computer, it immediately made a high pitched whistling noise. It wasn't like coil whine, this one was much sharper and higher. The further away you got from the PC the louder it got. I thought it was just something for a first time launch and thought I should probably put some load on it so it can stretch its feet. I fired up my browser and a few moments later it died. I switched the main switch off, switched it back on and then started the PC again. Same thing happened. Moments after launching the browser, it died. Having everything unplugged to remove the power supply, I thought I should try just plugging in the motherboard and CPU and chassis ... MoreI got this just a couple days ago. I only installed it today as I had the opportunity to do so. However, when I started my computer, it immediately made a high pitched whistling noise. It wasn't like coil whine, this one was much sharper and higher. The further away you got from the PC the louder it got. I thought it was just something for a first time launch and thought I should probably put some load on it so it can stretch its feet. I fired up my browser and a few moments later it died. I switched the main switch off, switched it back on and then started the PC again. Same thing happened. Moments after launching the browser, it died. Having everything unplugged to remove the power supply, I thought I should try just plugging in the motherboard and CPU and chassis power button to see what happens and also record the sound. So I then attempted to put the motherboard ATX cable. I was shocked (pun not intended) to see that despite EVERYTHING UNPLUGGED, there was STILL current flowing through it. I had even cycled the PC chassis power button for a good 30 seconds or so to let everything out. But despite nothing being connected. And then even after this, after recording and testing (the whine was still there), I shut off the power supply, unplugged all the cables, cycled the power button and just as I was pulling the ATX cable out, halfway of connection sent bursts of current to the motherboard. I cannot believe how this can happen. How can the power still be going around even after everything is unplugged and any phantom power was cycled through by the power button? I am astonished at this, I'm in disbelief as I cannot even expect something like this from a faulty unit.
originally posted on scan.co.uk
Ive bought plenty of Corsair power supplies that were made by Seasonic but never bought an actual Seasonic. Im well aware of their legendary build quality and reliability since ive been building computers since the 90s and this unit worked out cheaper than the RMx corsair power supply I was originally looking at.I have this powering a 7800X3D, X670E and 7800XT setup and it pulls nowhere near 400w with V-sync on at 165hz. I have definitely gone overboard with the wattage but Its out of habit as I always liked the idea of having some power in reserve in case wanted to build my machine out a little more. The unit itself is a little more compact than the 7 year old Corsair AX750 it replaced.The Seasonic runs pretty silent and the flat cable design made cable ... MoreIve bought plenty of Corsair power supplies that were made by Seasonic but never bought an actual Seasonic. Im well aware of their legendary build quality and reliability since ive been building computers since the 90s and this unit worked out cheaper than the RMx corsair power supply I was originally looking at.I have this powering a 7800X3D, X670E and 7800XT setup and it pulls nowhere near 400w with V-sync on at 165hz. I have definitely gone overboard with the wattage but Its out of habit as I always liked the idea of having some power in reserve in case wanted to build my machine out a little more. The unit itself is a little more compact than the 7 year old Corsair AX750 it replaced.The Seasonic runs pretty silent and the flat cable design made cable management a really simple job as there was no thick, chunky or bulky cables to try and hide away.the 24pin and 12v/PCI-E cables weren't super stiff or rigid either so there is a good bit of flex to help with cable management.
| Brand | Seasonic |
| Modular | Yes |
| 80 PLUS Rating | 80 PLUS Gold |
| Power Output | 850 watts |
[PSUSEAFOCUSWHITE850GXA3] Seasonic FOCUS GX-850 White 850W ATX 3.0 Gold Modular PSU
7-day returns
Seasonic FOCUS GX-850 White 850W ATX 3.0 Gold Modular PSU
Free delivery
Seasonic FOCUS GX-850 White 850W ATX 3.0 Gold Modular PSU
Free delivery
Seasonic FOCUS GX-850 850W ATX 3.0 Fully Modular PSU, 80 PLUS Gold, White
Free delivery between 9–13 Nov
Seasonic Focus Gx-850 White 850w Atx 3.0 Gold Modular Psu
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
If you know nothing about power supplies, this is a quality option; it isn't cheap, but it's designed to last 10 years or more. Being fully-modular, you are given plenty of cable options: 2 CPU cables (most people will only ever need one), 3 PCIe cables (just in case your GPU setup needs it), at least 2 different SATA cable options for different case sizes and restrictions. (Yes there is a 24pin cable, but there's only one so it's not an option). My favourite feature--it's 80+ Platinum. Based on some cursory math, my still limited understanding of electricity, and the current prices of both PSUs and electricity in my area, this unit should save ME a small sum of money over the 80+ gold version over a period of 10 years. Does this mean it will save you money, no. ... MoreIf you know nothing about power supplies, this is a quality option; it isn't cheap, but it's designed to last 10 years or more. Being fully-modular, you are given plenty of cable options: 2 CPU cables (most people will only ever need one), 3 PCIe cables (just in case your GPU setup needs it), at least 2 different SATA cable options for different case sizes and restrictions. (Yes there is a 24pin cable, but there's only one so it's not an option). My favourite feature--it's 80+ Platinum. Based on some cursory math, my still limited understanding of electricity, and the current prices of both PSUs and electricity in my area, this unit should save ME a small sum of money over the 80+ gold version over a period of 10 years. Does this mean it will save you money, no. Please do your own math because there are a whole host of factors to consider. If you do know lots of stuff about PSUs, I probably can't help you. I have been satisfied with the quality of the components and the ease of building with this PSU. Unfortunately I won't be able to tell you if this thing lasts 10 years, but if you know anything about warranties... Okay I need to go do other things today.
I got this just a couple days ago. I only installed it today as I had the opportunity to do so. However, when I started my computer, it immediately made a high pitched whistling noise. It wasn't like coil whine, this one was much sharper and higher. The further away you got from the PC the louder it got. I thought it was just something for a first time launch and thought I should probably put some load on it so it can stretch its feet. I fired up my browser and a few moments later it died. I switched the main switch off, switched it back on and then started the PC again. Same thing happened. Moments after launching the browser, it died. Having everything unplugged to remove the power supply, I thought I should try just plugging in the motherboard and CPU and chassis ... MoreI got this just a couple days ago. I only installed it today as I had the opportunity to do so. However, when I started my computer, it immediately made a high pitched whistling noise. It wasn't like coil whine, this one was much sharper and higher. The further away you got from the PC the louder it got. I thought it was just something for a first time launch and thought I should probably put some load on it so it can stretch its feet. I fired up my browser and a few moments later it died. I switched the main switch off, switched it back on and then started the PC again. Same thing happened. Moments after launching the browser, it died. Having everything unplugged to remove the power supply, I thought I should try just plugging in the motherboard and CPU and chassis power button to see what happens and also record the sound. So I then attempted to put the motherboard ATX cable. I was shocked (pun not intended) to see that despite EVERYTHING UNPLUGGED, there was STILL current flowing through it. I had even cycled the PC chassis power button for a good 30 seconds or so to let everything out. But despite nothing being connected. And then even after this, after recording and testing (the whine was still there), I shut off the power supply, unplugged all the cables, cycled the power button and just as I was pulling the ATX cable out, halfway of connection sent bursts of current to the motherboard. I cannot believe how this can happen. How can the power still be going around even after everything is unplugged and any phantom power was cycled through by the power button? I am astonished at this, I'm in disbelief as I cannot even expect something like this from a faulty unit.
Ive bought plenty of Corsair power supplies that were made by Seasonic but never bought an actual Seasonic. Im well aware of their legendary build quality and reliability since ive been building computers since the 90s and this unit worked out cheaper than the RMx corsair power supply I was originally looking at.I have this powering a 7800X3D, X670E and 7800XT setup and it pulls nowhere near 400w with V-sync on at 165hz. I have definitely gone overboard with the wattage but Its out of habit as I always liked the idea of having some power in reserve in case wanted to build my machine out a little more. The unit itself is a little more compact than the 7 year old Corsair AX750 it replaced.The Seasonic runs pretty silent and the flat cable design made cable ... MoreIve bought plenty of Corsair power supplies that were made by Seasonic but never bought an actual Seasonic. Im well aware of their legendary build quality and reliability since ive been building computers since the 90s and this unit worked out cheaper than the RMx corsair power supply I was originally looking at.I have this powering a 7800X3D, X670E and 7800XT setup and it pulls nowhere near 400w with V-sync on at 165hz. I have definitely gone overboard with the wattage but Its out of habit as I always liked the idea of having some power in reserve in case wanted to build my machine out a little more. The unit itself is a little more compact than the 7 year old Corsair AX750 it replaced.The Seasonic runs pretty silent and the flat cable design made cable management a really simple job as there was no thick, chunky or bulky cables to try and hide away.the 24pin and 12v/PCI-E cables weren't super stiff or rigid either so there is a good bit of flex to help with cable management.
Overall, it's pretty fantastic. The unit is quiet, even with the fan on constantly, it provides all the power it says it does, and comes with plenty of very high quality cables for everything. I did learn that the Hybrid Mode button on the unit doesn't really do anything particularly impressive. All the button does is make it so the fan only comes on when the unit gets hot. A better name for the button would be "quiet mode." However, as I can still hear people walking on the sidewalk outside from my second story office window, with its fan constantly on I've got to say that the unit is just generally pretty quiet and it's just generally better to keep the fan going to it stays as cool as it can be than only cooling it when it gets hot. The documentation, however, is ... MoreOverall, it's pretty fantastic. The unit is quiet, even with the fan on constantly, it provides all the power it says it does, and comes with plenty of very high quality cables for everything. I did learn that the Hybrid Mode button on the unit doesn't really do anything particularly impressive. All the button does is make it so the fan only comes on when the unit gets hot. A better name for the button would be "quiet mode." However, as I can still hear people walking on the sidewalk outside from my second story office window, with its fan constantly on I've got to say that the unit is just generally pretty quiet and it's just generally better to keep the fan going to it stays as cool as it can be than only cooling it when it gets hot. The documentation, however, is a whole other story. There is half of a small little page in like a fourteen page book that holds any kind of instructions or documentation. Everything else i just the same tiny amount of instructions repeated in a bunch of different languages. Some sort of graphic or better documenting what each cable is for, or just mildly more comprehensive instructions than what is given would help increase the value of the included documentation immensely. As it stands it's a little too basic considering this really is the heart of one's computer. Because the documentation was a bit too lacking I'm giving a 4/5 rating. If the documentation was ab it more comprehensive this would absolutely be 5/5, it really is a fantastic unit, just not at all well documented with what's given in the box.
The PSU contains all of the necessary parts (plus spares), there is excellent support and information available, the unit is compact and extremely quiet. There is a 10 year warranty on the product. The power supply is feeding: ASRock Z390 Phantom Gaming ITX/ac 9900K @ 4900MHz 32GB memory @ 3200 GTX 1660 Super 7 case fans 240mm AIO cooler I don't have the equipment or desire to test various power attributes, so I am not much use in that department. The system is stable, so the PSU must be doing its part. I have one suggestion for the unit. There is a button which allows selection of the fan's operation. Standard or Hybrid. Hybrid allows fanless operation. There is a two position push button on the back to select. Hybrid is the out position and the fan "on always" ... MoreThe PSU contains all of the necessary parts (plus spares), there is excellent support and information available, the unit is compact and extremely quiet. There is a 10 year warranty on the product. The power supply is feeding: ASRock Z390 Phantom Gaming ITX/ac 9900K @ 4900MHz 32GB memory @ 3200 GTX 1660 Super 7 case fans 240mm AIO cooler I don't have the equipment or desire to test various power attributes, so I am not much use in that department. The system is stable, so the PSU must be doing its part. I have one suggestion for the unit. There is a button which allows selection of the fan's operation. Standard or Hybrid. Hybrid allows fanless operation. There is a two position push button on the back to select. Hybrid is the out position and the fan "on always" mode is pushed in. I installed the power supply upside down so that the fan could take in air from the bottom vent of the case. Therefore, if the fan is not spinning, there is no good way for the PSU to vent the hot air. It would probably be too much to ask if the unit could sense its orientation and disable Hybrid if its upside down. Otherwise, maybe a light indicating Hybrid mode or better still, a single tone when the PSU is turned on or the mode is changed. I'm very happy with the product.
It's impossible to write a review about a device that could fail tomorrow. It does have an extended warranty, which is useless because you have to return it to the manufacturer and it could take months. This is true for everything we buy on 'trust'.It arrived on time. It's smaller than my other 850 watt EVGA. Fan-stop mode is - quiet, why wouldn't you always use fan-stop mode? It's inaudible when under load. Cables are the flat type which to me always feel cheaper but I'm not an expert. It does what is is supposed to and I hope it lasts for many years. If it fails tomorrow I won't be able to tell you.
I have owned about a dozen Seasonics over the years. I still haven't had one fail. I did have one that by spec should have been able to run a card but being about 8 years old at the time, it couldn't do it. Other than that I've had one fail. I had a friend that burned one up using it on a server, and Seasonic replaced it immediately without any issues. The quality of every Seasonic I've owned has always been top-notch. Seasonic is the Cadillac of PSUs, You can immediately tell the quality of a PSU just by picking it up. If it is lightweight, it's a cheap PSU that doesn't have great heatsinks. If it's heavy that means it was built to last and will run for many years to come. I think the 10-year warranty is another big deal. If it wasn't built as well as we have come ... MoreI have owned about a dozen Seasonics over the years. I still haven't had one fail. I did have one that by spec should have been able to run a card but being about 8 years old at the time, it couldn't do it. Other than that I've had one fail. I had a friend that burned one up using it on a server, and Seasonic replaced it immediately without any issues. The quality of every Seasonic I've owned has always been top-notch. Seasonic is the Cadillac of PSUs, You can immediately tell the quality of a PSU just by picking it up. If it is lightweight, it's a cheap PSU that doesn't have great heatsinks. If it's heavy that means it was built to last and will run for many years to come. I think the 10-year warranty is another big deal. If it wasn't built as well as we have come to expect from Seasonic, they wouldn't be around long giving that long of warranty. Buy it if for nothing else so you buy one to know what a quality PSU looks and feels like, so you'll know in future PSU purchases when you get a cheaply made one. It's the PSU that all other PSU will be measured. I suggest buying the absolute most power you can afford for a Seasonic because this is a PSU that you can use for the next 10 years assuming it has enough power. I say buy with confidence.
Bought the Seasonic Focus GX 850 as I plan a big upgrade toward the end of this year. Seasonic make PSUs themselves (as well as provide the platform for other brands) and have a solid reputation. This model is clearly high quality, fully modular and comes with a long 10 year warranty. All this for only about £30 more than more basic, lower wattage units with a 3/5 year warranty.Installed in my current PC it is silent and running flawlessly as you would expect.
No issues with the install and seems to be working fine. First time with this brand but reputation seems to be there. Comes with a little PSU tester. If the fan spins it's good, it says, but whether the fan will spin depends on whether your hybrid switch is on or off. If it's off = fan is on and it will spin when using the tester. The hybrid setting seems backwards to me though so watch that. Basically you need to think of that switch as fan always on = switch is down/in, and when the switch is out/off then hybrid is on and the fan will stop spinning and only turn on when load/temp is high enough. It's labeled hybrid mode so I would think that pressing it in would mean hybrid mode on but it's backwards. Edit 9/21/21 After 4-5 months it's still working well. Thought ... MoreNo issues with the install and seems to be working fine. First time with this brand but reputation seems to be there. Comes with a little PSU tester. If the fan spins it's good, it says, but whether the fan will spin depends on whether your hybrid switch is on or off. If it's off = fan is on and it will spin when using the tester. The hybrid setting seems backwards to me though so watch that. Basically you need to think of that switch as fan always on = switch is down/in, and when the switch is out/off then hybrid is on and the fan will stop spinning and only turn on when load/temp is high enough. It's labeled hybrid mode so I would think that pressing it in would mean hybrid mode on but it's backwards. Edit 9/21/21 After 4-5 months it's still working well. Thought I'd add the note below though. I had to add a cable because I needed more sata power connectors and couldn't find the cables that came with this (I had put them away too well) but found another from a different brand that looks just like it. It had "Type4" on the side of the connector. It fits, looks right, but the computer would not boot up. It would click on and turn off immediately, and continually keep doing that until powered off. I eventually found the cables that came with the PSU and they have a different label on the connector (can't remember, something with a B I think) and then it worked fine. I don't know what the difference is as they look identical, but they must be crossing some wires or something. Wish that was standardized. At least it didn't fry anything.
Dont let my nitpicks discourage you. Seasonics are the Mercedes of power supplies. The power quality is top notch and its fan is whisper quiet. The power supply conne yors use a heavy gauge of wire. The packaging is premium and the included cloth bag is a nice accessory to leep your cables in. Youll never know when youll need them in the future. You can tell Seasonic invest in their production lines and take pride on their product. This is my 12th system build and I wont invest in anything but seasonic or seasonic core rebadges. My last seasonic 850 watt gold is now 7 years old and never had a hiccup. Its voltage regulation is still excellent and viewing the power rails shows a minimal of noise (well within spec) after 7 years. Clean power regulation can be critical ... MoreDont let my nitpicks discourage you. Seasonics are the Mercedes of power supplies. The power quality is top notch and its fan is whisper quiet. The power supply conne yors use a heavy gauge of wire. The packaging is premium and the included cloth bag is a nice accessory to leep your cables in. Youll never know when youll need them in the future. You can tell Seasonic invest in their production lines and take pride on their product. This is my 12th system build and I wont invest in anything but seasonic or seasonic core rebadges. My last seasonic 850 watt gold is now 7 years old and never had a hiccup. Its voltage regulation is still excellent and viewing the power rails shows a minimal of noise (well within spec) after 7 years. Clean power regulation can be critical for overclocked components and voltage sensitive components. I have never seen a bad online review from the major tech websites on seasonic brands. Why an 850 Watt? As power supplies age the lose their maximum power rating. Japanese capacitors slow this degradation process, but it is possible to lose 20% capacity after 10 years on some brands. Also seasonics power ratings are largely based on the 12V rail rating which is the biggest power draw by far. Most other brands will combine 3.3 5 and 12 volt rail power ratings and come up with a less realistic number. So with seasonic that 850 watts is an honest and realistic 850 Watts. To increase longevity of components and run at good efficiency you really dont want to run past 80% capacity. So ( 100% - 20% loss) * 80% target * 850 = 544 solid watts after 10 years. Now with seasonic they have a great warranty so if you dont make 850 watts you are covered. With lesser brands you likely arent covered for near as long. Now why would you buy a platinum over a gold? Well if you run a 24/7 file server or hate heat then platinum will be a decent choice. My only cavaet with the focus plus is the small size. I inserted my seasonic fanside down on my thermaltake core v21. The size is so efficient that the fan vent hole on the case doesnt line up, blocking about 30% of the fan. So if you get a case make sure you can invert the power supply to avoid this situation. I like upward facing into the case anyway as it helps vent heat out of the case. Plus a good case will filter the air for dust helping keep your power supply clean.
| Brand | Seasonic |
| Modular | Yes |
| 80 PLUS Rating | 80 PLUS Gold |
| Power Output | 850 watts |
