I have this power supply powering an Asus P9x79 motherboard with a 3930K CPU, a single Gigabyte NVIDIA GTX 670 OC graphics card, 32 GB Kingston RAM, four fans including a Coolermaster TPC 812 heatsink, 2 SSD's(Crucial and Force 3 GT) and 2 optical drives in a stock, non overclocked system in a Corsair 550D case. The PSU just "loafs" with this system, and its own fan NEVER comes on, even during 3D work in Photoshop. The only way that I know that its fan is actually "working" is direct observation when turning off the computer where the final slight pulse starts the fan for a second. Since the PSU never heats up sufficiently to kick its fan into operation, I can have no comment on how loud that might be, operating at low RPM's or at full tilt....suffice it to say, that, bottom line, in my system, the PSU is absolutely silent, for whatever that might be worth!! As a Gold unit, it's efficiency (effective power: heat generated) is very high, so no wonder the fan is not called upon.
The fully modular aspect, packaging, and outlets provided have been discussed in several reviews, so no need to repeat here. Spatially, the unit fits comfortably into a mid sized case, and is not obviously oversized such as is the situation with 1000W and up.
A few small points do need emphasis:
1) the nylon-sleeved cord harnesses, while attractive, are quite stiff. This makes maneuvering them to their attachment sites a little tricky, but not a major detraction. Working them back and forth helps loosen them up a bit. Where it is potentially important is in getting the ATX 8 pin power connector attached to, and, especially released from the motherboard without going through the nuisance of removing a large heatsink which may partially obstruct access to that header, as it does in my case. What I suggest is to buy an inexpensive 6 inch extension 8 pin connector which is flexible and much easier to deal with in a tight space. You can then lead the extension through a passway to the rear compartment, and make the connection with the Corsair cable there easily where space is unobstructed.
2) the SATA power connectors are VERY tight. For people not familiar with these hookups, and rightfully told not to "force anything", just be sure you have the guide lined up correctly and push with gusto. Because of the considerable force needed, particularly when you detach the connector, be sure to pull exactly in the horizontal plane of the connection on the drive so that you don't risk breaking off the plastic post which will make the hardware henceforth unconnectible.
3) As mentioned in one review, the clips on the Corsair's cables' connectors sometimes don't "click" into place, and also the thumb release tabs can be rather stiff, making release a bit difficult. That's another reason why I suggest the extension for the 8 pin ATX connection.
As has been mentioned, these power supplies are made by Seasonics, and while there must be a few proprietary changes between what would seem to be identical units except for color, those differences must be slim to none by a manufacturer which is pre-eminent in PSU manufacture, coupled with a destination company that also markets only the highest quality goods.
BOTTOM LINE: Highly recommended. It should supply adequate power and then some for all but perhaps the most demanding, sustained applications in overclocked systems with multiple graphics cards.
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This Item  Corsair Professional Series AX 850 Watt ATX/EPS Modular 80 PLUS Gold (AX850) |  |  |  |  |  | |
| Price | — | -17% $124.99 List: $149.99 | -23% $146.80 List: $189.99 | $465.10 | $197.94 | $191.00 |
| Delivery | — | Get it as soon as Wednesday, Apr 10 | Get it as soon as Wednesday, Apr 10 | Get it Apr 12 - 16 | Get it Apr 12 - 16 | Get it Apr 11 - 15 |
| Customer Ratings | ||||||
| Energy efficiency | ||||||
| Noise level | ||||||
| Easy to install | ||||||
| Value for money | ||||||
| Quality of material | ||||||
| Sold By | — | Amazon.com | Amazon.com | QualityPcParts․com [Expedited] ⓐVerified Seller ✅ | QualityPcParts․com [Expedited] ⓐVerified Seller ✅ | GeekTown (Daily Expediated Shipping) |
| power supply design | Full Modular | Full Modular | Full Modular | Modular | Full Modular | Full Modular |
| connector type | SATA, Floppy | ATX | ATX | EPS, ATX | PCI Express | PCI Express |
| form factor | ATX | ATX | ATX | ATX12V / EPS12V | EPS12V | — |
| cooling method | Air | Air | Air | Air | Air | Air |
| fan count | 1 | 1 | 1 | 0 | 1 | 1 |
| wattage | — | 850 watts | 1000 watts | 1050 watts | 850 watts | 850 watts |
Reviews with images
Powers The Dragon - Nuff Said
This Power Supply ROCKS - It is silent, has been running now for 4 plus years without breaking a sweat - I love CORSAIR RAM, though this is the first Rig I used their Power Supply, it won't be the last - I build Gaming Rigs for a Hobby (Family, Friends, Referrals) - Over 2 dozen buit since 1998 - I said it was a Hobby - Lol.. It was super easy to install, I am very particular about hiding all the wiring where possible, though that is more an issue for the Case, the Connection Points for this PS make hiding the wiring very easy. I have 10 Fans in this Beast, all of them, including the PS are virtually silent - I have an external switch atop the case to adjust the speeds, three or four settings, and every setting except the highest is silent, even the highest setting you have to concentrate and get close to the case to hear them. The Power Supply is Extremely Stabel, handles many hours of Gaming without getting hot - But look, this Rig probably needs only 500-600 Watts to run, This is one area, and there are a few, where I like to Overkill..It's all about Quality, Durability, and Reliability and the Corsair AX850 Delivers on all fronts..Though this rig is far from being Obsolote, I am considering building a New One, maybe next year after Christmas (2019).. If and When I do, Corsair will be my Go-To Power Supply for sure- They are Great and I like their style and looks...
