Pros: * Plenty of connectors. Some online spec listings for this PSU are incorrect. It actually has 4 SATA Cables, each with 4 SATA Power connectors, for a total of 16 connectors. It also includes two 4+4 pin CPU power cables, and 4 6+2 PCI-E power connectors. There should be plenty of cables available, however if you plan on running TWO OR MORE HIGH-END video cards each with 3 power connectors, you will not have enough. This is the most cables I have ever seen on a 750W unit. * Cables are easy to bend, and long lengths. I had no issue moving and bending the cables into place, it seemed easier than other units although I didn't notice anything special about the material used in the cabling. Each of the individual cable pieces are attached together with soft plastic. * "ECO Mode" fanless operation at idle and low loads. I spent some time trying to fully load my system (around 400W-450W from the wall) and the fan still didn't spin. The amount of heat this unit can handle passively is incredible. It would take a very high power usage GPU to activate the fan. Even then, it should operate below 1000 RPM which would make it nearly inaudible. I wasn't able to get the fan to spin up aside from boot-up, so I couldn't test the noise. In that respect, the unit is totally silent! * 12V Single Rail vs 5 Rail Mode. A new feature, the first time I've seen it, is the included 12V Rail switch. While in "Multiple" rail mode, each connector has an over-current protection at 40A. While in "Single" rail, each connector has access to full capacity. This is a nice way to both protect your components and also unlock extra power if you need it. This is a great new way for users to customize how their PSU distributes power and I'm glad to see it. * Platinum efficiency.

Cons: * Large size, may not fit in some cases. Be warned, this is a 180mm PSU so it won't fit in all cases. Also, if you're going to mount the PSU with the fan facing down, make sure your case's PSU in-take is large enough to allow space for the fan to breathe. It should be fine in most cases, but this is something you should be aware of before trying to install it. * Connector labeling can be tricky or confusing. Lastly, the connector labels on the PSU itself are a bit sloppy. Generally you can't plug something where it doesn't belong, however it's always a good idea to make sure everything is hooked up properly. Also, do not try to re-use modular cables from other PSUs -- even if they're also made by Corsair, or even the older HX750 or HX750i units -- as that will risk frying the unit. ONLY use the included cables.

Overall Review: As with previous HX-Series units, the OEM supplier for this HX750 Platinum is Channel Well Technology (CWT). This is without a doubt the best PSU I've ever tested, while also being an incredible value. It's not only quiet, but nearly always completely silent. I didn't notice any coil whine or buzzing noises of any kind, installation was a breeze, and it handled everything I threw at it gracefully. With a surplus of connectors and cables, it should be perfect for nearly all builds. And with the Platinum efficiency, it should waste less power and run the full length of the warranty (10 YEARS) and beyond. Great PSU, well done Corsair.

Pros: Corsair was originally known for their outstanding PC memory, but about 6 years ago, they made a big splash in the PSU market. Their HX line caught the industry by storm a few years ago and they're back at it now with their improved "I" series of super efficient, high performance power supplies. I am not going to try to give a professional review of this PSU with voltage and rail readings, because I simply do not have the requisite knowledge and equipment to provide this level of testing. But here's the improvements that really caught my attention with the new HX850i PSU. +Small and Light. PSUs have come a long way in terms of their internals. They used to be really heavy, and large to accommodate all the capacitors, coils and heatsinks needed to keep them operational. This HX850i is much smaller than my older HX1000, which is great for smaller footprints like Steam or Lan Boxes that still house powerful components like micro ITX rigs with full-sized Graphics cards. +Fully Modular. I believe Corsair went this route starting with their AX series, but my older HX1000 was not fully modular, the ATX 24-pin and 8-pin, as well as a few PCIe leads were not modular and came from a central stalk. Not a huge deal, but the clean look of a fully modular PSU is nice and the distributed leads from the PSU allow for better cable management. There are tons of leads and connectors for even the most busy system with Quad-SLI/CF, 10+ drives, tons of system fans. +Pliable sleeved cables. Not as nice as expensive braided cables, but some of the nicer rubber sleeving I have seen. Better than my HX1000 in terms of pliability. +Quiet! Can't believe how quiet this PSU is, the fan actually doesn't spin at all most of the time and operates completely silently. You have to put a decent load on it (~200W) before it spins up and even then you can't hear it. +Incredibly Efficient. The HX1000 I had wasn't the most efficient design, but it was ahead of its time and was still 80plus rated. This new 850i is amazing with its 80 Plus platinum rating. Using a kill-a-watt meter from the wall, this PSU was only drawing 95W on an older, power-hungry X58 platform with a GTX 670 connected to it. Using an Antec TruePower Quattro 1200W, the same system was drawing 150W. That's an amazing difference at idle/desktop usage. +Amazing presentation. This product just exudes that premium/quality feel when you unbox it. It's laid out nicely in a velvet duster bag, like one of those crown royal bags, and there's a nice Velcro bag for all of your extra modular cables (same as HX1000). Zip ties, slick Corsair case badge, and black anodized screws are also included again.

Cons: Honestly there's not much to take off of this power supply. The only con I would give is that the Corsair Link is still very flakey in Windows 8.1. I still have problems with it with my H100i, but it doesn't impact the performance of this PSU in any way, so I didn't take off any eggs for it. I also don't mention it as a Pro for this reason.

Overall Review: I'm not quite sure the difference between Corsair's AX and HXi series, but I don't think you can go wrong with either. The efficiency and lightweight size and profile of this new PSU line can't be ignored however, and when paired with smaller gaming rigs, or rigs with more efficient powerful GPUs (hello GTX 970/980), then this PSU is plenty to power 2 or even 3 GPUs. If you aren't sure, you can even go up to the 1000W model if you think you need the headroom. I think the price is fair for this range of power supply, especially given how efficient it is.

Pros: The package and presentation is great! A nice sturdy box within the decorative outer box contains a large bag full of power cables, a real, thick, multi-language manual, and soft foam that immobilizes the PSU, which comes wrapped in a satin bag. The little touches make this power supply stand out – The chamfered edges, the sturdy connectors that click smoothly and softly into the PSU, the oversized power switch on the back, and the tag that reminds you that it’s perfectly normal for the fan not to spin under light loads. The number of cables that are included with this PSU is immense : -One 24-pin Motherboard cable, two 8-pin CPU cables -Four double 6/8-pin PCI-E cables (for a total of up to eight 8-pin PCI-E connectors) -Three quadruple Molex cables (for a total of up to 16 Molex connectors) -Three quadruple SATA power cables (for a total of up to 16 SATA power connectors) You will never have to compromise in selecting which of these cables you need to use, since there are connectors for all of them on the PSU. Additionally, they include a Mini USB to USB header cable to allow the PSU to communicate with the Corsair Link software, a proprietary Corsair Link cable to connect the PSU to a Corsair Link hub if you have such a device, and two Molex to Floppy power connectors. All of the cables feel sturdy and well-made, and should be easy to manage, as long as the Corsair-style flat cables are your preference. Corsair Link seems to be a great piece of software. Not only does it allow you to see lots of PSU information – input and output wattage, efficiency, voltage and amperage for all 3 rails, and PSU temperature - but it also grabs motherboard fan header RPM, CPU temp, and even GPU fan and temperature data. It rolls GPU monitoring software, fan control software, fan control software, and detailed PSU information all into one. Bravo. At idle, my desktop consumes 100-120W of power, and the PSU’s self-calculated efficiency lies between 85-90%, which is phenomenal. My lowly quad-core, single GPU desktop with a 5-drive hardware RAID 6 array managed to load the PSU up to about 250W – efficiency held around 92%, and the fan does not spin at all. Unlike some other PSUs I’ve had in the past, there was no coil whine or squeak to be heard from this unit. This is to be expected from a high-quality, high-wattage power supply, but no noise is good news!

Cons: Corsair flat cables have their quirks – For example, the 24 pin cable is split into 2 connectors at the PSU – No, not 20+4, but 10+14. Four wires cross over immediately at the connector, and the 4 sections of flat cable do not go straight into the motherboard connector – they cross over each other, making it impossible for the cable to lie totally flat. I can’t claim to have engineered this power supply, but I can’t fathom that they couldn’t come up with a better design than this. If you are creative with your cable management, you can make it work – it doesn’t stand out in my case, and the “rear” side panel still fits flush. Flat cables are, in general, love-or-hate. I personally like them, but many reviewers do not share my enthusiasm for them, and would rather have a bundle-o’-wires with sleeving and heat shrink. Keep in mind that this PSU is not a standard ATX length – While this is not a fair con, since such a powerful PSU must be this big (and many are much larger), keep in mind that this PSU may not fit in some smaller cases. My HAF 932 case provided plenty of room in both PSU mounting locations, and most full tower cases should.

Overall Review: Although I was not in the market for a power supply – my three-year-old Corsair AX750 is still humming along, which is a testament to the quality of Corsair PSUs – I was thrilled to receive this review sample from Newegg. I would not hesitate to recommend this PSU to anyone looking to build or upgrade, provided they are happy with Corsair’s flat cable style. With built-in monitoring hardware, this is the ultimate in control and knowledge of what is going into your computer.

Pros: • Tight voltage regulation. • Fan doesn't kick on until you use more than 400 watts, approximately, and when it does turn on, it's about as quiet as any other PSU fan of today. Quieter than other fans in the system. • Switch for Single or Multi Rails. • Platinum rated efficiency. 1000 Watts is also a sweet spot if you care about efficiency. Idling you'll remain above 84%, on average, and at any load above that you'll easily be in the 90-95% range. • Quality cables. • Corsair continues to provide excellent service, both in help and RMA process, should you ever need it. They're one of the few consistent companies I've experienced lately with most former reliable companies taking a dive in customer service.

Cons: • If you want to nitpick, for the price, this is a low frills and low gimmick PSU. For some that's a selling point for others it might leave them a bit wanting if they like show-offs. • On a graph this PSU doesn't have the "best" ripple suppression compared to others but in reality it doesn't matter as it's well beyond any recommended spec.

Overall Review: People like to wonder why such a high wattage power supply is needed these days when even in SLI you don't need this much and the answer is pretty simple: You get better efficiency in almost all power supplies when you use only 40-50% of its max capacity. Better efficiency means stable power, quieter systems, cooler systems, and less wasted money -which definitely matters if your computer will run 24/7 at load. You're saving power, not wasting it, by going above your actual system demands. Of course, you'll get diminishing returns going from Gold to Platinum. On the flip-side, if you're going for a silent system this power supply will give you more headroom without its fan ever kicking on. Overall, this is a solid PSU with a good warranty backed by a reliable company. It's a no brainer if it's in your budget.

Pros: I have been a proponent of fully modular power supplies before corsair entered the PSU market. This is a great example of having complete control over cable management. The fully modular feature is worth any added cost. I was intrigued by the selectable 12v multi vs single raid feature. It makes sense if you’re going to try to run one large video card and potentially could be more efficient in multi rail configuration if running lower specs. In addition it has platinum rating, is incredibly quiet, and the cables are long enough even for the larger computer cases out there.

Cons: It would be nice if the corsair link was just a standard feature on their power supplies. It is priced with the premium power supplies but you get what you pay for. The first good power supply that I bought was seasonic back in 2007ish. I had bought sub par super cheap ones prior to that and any time I would put them under extreme load it was hit or miss if I’d crash. That power supply lasted me through 8 years and countless upgrades until my power usage became greater than that one could provide.

Overall Review: I installed this power supply when I received it a couple months ago and it replaced a 760 axi power supply. It was just as quiet and provided a little more power for my computer when it needed it. Operation is largely silent until I start playing a video game and at that point all the fans in my computer rev up so I can not really differentiate the fan from any of the other ones. Invest in a good power supply and you won’t regret it. They are the ones supplying the correct voltage and current to your entire computer. If they mess up they have the opportunity to take out your video card which I assume is worth a lot more then 160.

Pros: Build: The overall build quality of this unit is very good. It's heavy and ridged with a very solid fan grill. The plugs are all very sturdy. Fan: The fan is extremely quiet. Granted, in my system the only time it would spin was at bootup. It will only turn on when operating temps reach 40C. Even running a torture test with AIDA64 and OCCT it did not cause the fan to spin. It was only warm to the touch. (see specs below) I was not able to cause any game played to pull enough power to heat up the unit to turn the fan on. Cabling: This unit is fully modular and the cabling is very nice. All cables, minus eSATA cables, are sleeved and shrink wrapped very well. Warranty: This unit comes with a 10 year warranty. Protections: Over-voltage protection, under-voltage protection, short circuit protection, over power protection, and over temperature protection. Selectable Rail Protection: The interesting thing about this power supply is it comes with a selectable rail switch to run in single or multiple rail configurations. In single, it will allow 62.5A of power over ALL 12V rails. In Multiple rail selection it will only allow 40A on each connection before the Over-Current Protection kicks in at 40A on any give rail. This is pretty neat and lets you decide. Testing: Ran OCCT and AIDA64 tests and recorded 3.3v, 5v, 12v, and vcore voltages. All remained constant during the test. With the exception during a fluctuating core clock, it delivered a consistent voltage to my system. At no time during any test did the PSU fan kick in. This tells me it never reached 40C at any point and was only slightly warm to the touch. Price: I think this unit is priced very well for what is offered. It has no issues powering my system running the most demanding games and holding my overclock.

Cons: None really. If you have a full tower some cables may be a little short if the PSU is bottom mount.

Overall Review: Machine Specs: --------------- Intel i7-6700K (4.6GHz) Gigabyte Z170X-Ultra Gaming G.SKILL Ripjaws 16GB DDR4 2800 Gigabyte GTX1080 G1 (OC GPU 1800MHz/ VRAM 5504MHz) (2) Intel 330 Series 240GB RAID0 2TB WD Blue Phanteks Enthoo Evolv ATX case

Pros: Corsair really knows how to package a power supply. The power supply itself is encased in a felt bag while the modular power cables are kept in a separate Velcro bag reminiscent of a small battery drill bag. This came in handy to store the modular cables not used during the installation. Included in the box is even a baggy of zip ties. The HX1000i is a very quiet unit. The units fan doesn't kick on till a little over 400 watts (the manual indicates 400 but during testing, this varied). Once the fan kicks on, it is still very quiet thanks to being 140mm. Efficiency levels of this power supply when outputting 60 to ~170 watts is <90% on a standard 120v 60hz US power outlet. Peak efficiency measured was approx 92% at ~465 watts. Even with the max power draw I was able to apply, ~600 watts, the efficiency still remained right at 90%. Corsair migrated to a single 12v rail resulting in a 83.3 amps available. The following are the measured voltages while pulling 60 watts: +3.3V Rail = +3.33 Volts +5V Rail = +5.06 Volts +12V Rail = +12.22 Volts When the max power draw available for testing was placed, ~600 watts, the following voltages were measured: +3.3V Rail = +3.32 Volts +5V Rail = +5.02 Volts +12V Rail = +12.07 Volts *These were measured using the Corsair Link Software and confirmed with a third party software. With this results, the HX1000i exhibits minimal voltage ripple. The Corsair Link software is a fantastic product in and of itself. For this software to get data from the power supply, it must be connected via one of the two Mini USB ports on the unit. This can be accomplished either by an internal USB header on your motherboard and a mini USB connection on the internal side of the power supply using the included cable or the Mini USB on the external side of the power supply to an external USB port on a computer. The Link software allows you to see the current voltages, efficiency, fan speed, and temperature of your power supply while also displaying temperatures and fan speeds of various other components in your PC.

Cons: The HX1000i utilizes Active PFC in order to reach higher efficiencies. Due to this, Corsair recommends only using a Pure Sine Wave UPS with this power supply. This isn't found in the manual or on the Corsair FAQ but is stated multiple times in their Forums by Corsair representatives. During initial testing, the power supply was connected to a stepped sine wave generating UPS. Due to this, I would experience random warnings from the UPS while also having PC stability issues. Once a Pure Sine Wave generating UPS was used instead, all of these issues were corrected. This is only a 'Con' because it took hunting through the Corsair forums to find this as it's not included in the manual or on Corsairs Technical Support FAQ.

Overall Review: At a little over 7 inches deep, this power supply is slightly longer than any other power supply I have owned. Corsair includes a test button on the back of the power supply but this is simply to confirm the fan is working on the unit, not for a complete power supply check. All in all, this is a great power supply with quality engineering in place. The 7 year warranty is also a bonus compared to power supplies of the past.

Pros: This Corsair unit is packaged exceptionally well in a large box. It is fully modular and it comes with an extended 7 year warranty. The black colored unit with Blue and white lettering looks good too! I have been using Corsair PSUs for the past 7 years. I have the Corsair 1200W and 1000W units powering my bench setup for the past few years and they perform flawlessly. I would have loved to match this PSU up with some enthusiast VGUs but currently I had none available. Therefore my setup for testing this PSU was a ASRock Z97 OC formula with a 4790K CPU with 2 SSDs in RAID 0 with 2 NVidia 8800GTS 512 VGU's in SLI. The unit has three 6+2 modular cables to power Tri VGU systems. The cables are all black colored with a flat ribbon style allowing them to be used in tight places. I do like the fact that this unit has 2 8-pin EPS connectors that are used to power the CPU sockets on a motherboard. This allows for maximum potential CPU overclocking. Especially if you are an extreme OCer and go sub zero. After hooking up this PSU to my system I thought I received a DOA unit since my Motherboard's red little power indicator light did not illuminate. Therefore, I checked all my connections again and again. But after double and triple checking all the connections were secure, no motherboard power indicator light lit up. So, I just pressed the power on button on the Mobo, and to my surprise the PSU and the system came to life. To stress the unit to the maximum I could with the available hardware I had available to me I ran some 3DMark benches. The CPU was ran at 4c/8t at 4.95GHz under water. The VGU's in SLI at 800/1200. The Corsair 850 was also powering the water pump, some optical drives, 10 140mm fans at 2400 rpms. This PSU is built for those who are looking at keeping their systems as quiet as possible. The cooling fan on this PSU is triggered when the unit gets warm when it is delivering somewhere between 300 - 350 watts. Therefore, for a majority of systems that are not being overclocked the fan will not spin and this PSU will not create any fan noise. My system exhibited no electrical buzzing sounds from coil whine. This PSU comes with a Corsair digital link for additional monitoring and control. You connect the included link cable to a motherboard USB header and you can monitor the PSUs performance from your desktop. I compared what the software was telling me the unit was supplying to what my Killawatt device was showing. And they were very close.

Cons: I did not like that the 24 pin ATX cable can be separated into a 20 pin connection by separating off the other 4 pins. My preference would be to just have a solid, non-splitable, 24 pin cable. Secondly, the pricing for a unit with these characteristics may be a little to rich for some to justify paying for. Though this unit is fully modular and has a 90% efficiency rating and uses all Japanese 105°C capacitors does merit a premium over other 850 Watt PSUs.

Overall Review: At current pricing the decision to purchase this unit isn't a No-Brainer. It will depend on what the buyer is looking for in a PSU. This Model is basically a Cadillac 850 Watt PSU with all the bells and whistles. Also, securing the cables into their receptacles is sometimes tricky. You may need to push them in hard until you hear the clicking sound that the clip has latched.