Pros: This is not my first modular power supply, but it is my first modular unit from Corsair. In the past, I’ve only used Corsair models that use Seasonic as the OEM. This power supply is not a Seasonic unit, but rather Channel Well (CWT) made. CWT can be hit or miss, depending on the model. However, after observing this power supply in person and using it for a while, I can vouch that this is definitely a hit and Corsiar is showing their confidence with a 5 year warranty. To start, it is 80 Plus Gold Certified and it actually meets the gold specifications in actual use and not just on paper. Corsair has specifically designed this power supply to run silent and the excellent efficiency is a critical aspect of that design. Less waste = less heat = less cooling needed = less noise. This unit doesn’t even turn on the fan until it hits 40% load which puts it in very select company of truly “silent” power supplies, and not just quiet. I would definitely employ one of these power supplies in a system that may warrant a fanless PSU for complete silence. If a silent setup reaches a threshold that you may want active cooling to prevent component damage, it’s there when you need it. In my own computer with an overclocked i7-2700K, GTX 770, and 4 hard drives, the fan is completely off during normal computing tasks. When I fire up a game, the fan kicks on but is still inaudible. My hard drives are louder than this power supply. The unit I received is rock solid on all rails even when stressed with an overclocked system. From what I can see, the soldering on the inside of the unit is very good and the unit itself has some weight to it… another good sign of quality.

Cons: This is the first modular power supply I’ve acquired that does not come with a complimentary bag to house the spare cables. You can always stow them away in a large Ziploc bag I guess, but the absence is noteworthy.

Overall Review: This power supply is fully modular, meaning even the 24-pin and CPU power cables are detachable. Prior to this review I did not see the merit of having these cables detachable since they are used in pretty much any setup. However, during installation I actually see the benefit now. With the cables detached, it’s much easier to snake them through the case for a clean looking install. This is also my first experience with ribbon-type power cables. They look great and are easy to work through the case. Another design aspect I didn’t fully understand until installation was the beveled corners. I’ve only used square shaped power supplies in the past and wasn’t sure if the octagon shape of this power supply was for looks only or if it serves a function. My case is a smaller one, and I found this unit with its rounded corners was easier to shoehorn into position than a standard box shaped PSU. Picture in your head inserting the power supply at an angle and rolling it to get into a tight spot. Bravo. Well done Corsiar.

Pros: * Completely silent during normal usage - the fans don't spin up until the system load reaches 40% of the PSU's capacity, at which point they generate about 12dB noise until 70% power is reached, and from there the noise ramps up slowly to a maximum of around 25dB, which is still quiet (values obtained from the graph on the Corsair website). There is no coil whine or other noise I could detect from close up, and even when the fan is not spinning (my system did not provide enough load to trigger it), the unit barely gets warm. * Fully modular, meaning you can keep cable management very tidy and the all-black flat cables make your build look good. If you want to customize, Corsair also has individually sleeved cables for sale in a variety of colors. * Haswell compatible, meaning the low power draw sleep state will not trigger the PSUs' under-voltage protection and force a system reset. * Corsair Link compatible - using free software downloadable from their website, plus the appropriate Corsair Link hardware, you can control cooling and lighting that's connected directly to the PSU. Even without the pricey Corsair Link Commander module you can still monitor the PSU's power draw and fan speed (if it is spinning), provided you have a Corsair Link Analog to Digital Bridge cable (currently $9.99 at http://www.corsair.com/en/power-supply-units/psu-accessories-1/corsair-link-analog-to-digital-bridge-cable.html). * 5 year warranty - excellent

Cons: Cons: No real cons, just very minor nitpicks not worth deducting an egg for: * You have to purchase the Analog to Digital Bridge cable separately unless you purchased the RM1000, the only model with which it is included. I ordered the cable soon after my PSU arrived, and delivery was prompt. * No cloth bag to store unneeded modular cables in - my other PSU's are by another manufacturer, and I guess I've been spoiled, but the actually useful features of the Corsair more than make up for this anyway. Just store them with your other accessories or in the original box.

Overall Review: Note: This unit was sent to me by Newegg for review. I decided to use it in a rebuild of my Clarkdale i3-550 system using a mini-itx H55 board in a new Bitfenix Prodigy case. I was concerned whether it would fit in the case, but the 160mm length was right at the maximum specified by Bitfenix - it did fit, although the cables have to be bent sharply at the connectors. No problems once it was installed. When the Analog to Digital Bridge cable arrived from Corsair, I hooked it up to the PSU and a spare internal USB header, and installed the Corsair Link Software Installer (download at http://www.corsair.com/media/cms/drivers/CorsairLink-Installer-RC-v2.4.5110.exe). This provides a customizable GUI which lets me monitor hard drive, GPU and CPU temps, GPU and PSU fan speeds, CPU % load, and PSU current draw on the (single) 12 volt rail. With only a single GTX 460 video card, two case fans, and three hard drives, the power draw was not enough to trigger the PSU fan, but the unit still remained cool. You need one of their commander modules in order to monitor and control case fan speeds or a Corsair all-in-one liquid cooler, but I found it useful even without those. It would have been nice if the bridge cable was not an optional extra, but the PSU is entirely satisfactory as is. Time will tell if the RM650 is reliable, but it does come with a 5-year warranty. So far I'm extremely impressed by its silence, functionality, build quality, and how it looks in my system.

Pros: Fully modular Quiet at idle and partial load Plenty of adapters on each cable Haswell compatiable Peripheral & sata ports in psu can go right side up on the top two and the bottom row plugs in upside down, what this mean is when you plug in your sats drives you can arrange it so they plug in the right order without twisting the cables. Corsair link capable. able to bottom mount so fan is down so dust doesnt fall into it. 54 AMPs on the 12 volt rail. 2 x 4pin adapters to floppy drive

Cons: Years ago most rigs used 350 watt psu but now a days 650 is about the minimum i would want to put into a small gaming rig.

Overall Review: I like the fully modular design most power supply units that claim to be modular still have the 8 pin CPU and the 20 - 24 pim motherboard connector always connected and not modular. This PSU even the CPU and the Motherboard plug are modular. Which is nice but still those are the two plugs you have to have so why not make them permament. Power supply weighs in at 4 pounds with no cables attached. The CPU link cord is 28 inches you get two 4 pin adapters to floppy that are 3.5 inches useable. The 24 pin connector is overall 25 1/2 inches with 23 1/2 useable. PCI-E is overall 25 inches with 23 1/2 useable 4 pin is 30 inches overall with connectors starting at 17 inches and at 3 inches apart with 4 connectors per wire strand with 2 strands coming with the power supply unit. CPU strand is 4 or 8 pin with 27 inches overall and useable is 25 inches. sata you get two strands with 35 inches overall and connectors start at 22 inches with 3 inches inbetween and you get two strands with the power supply unit. When i went to hook up my sata drives i noticed that you could plug them in either right side up or upside down. On my other modular power supply unit when you ran the wires to plug in the sata drives you had to start at top and go down for the plugs to fit in right, With this power supply unit you can start at the bottom and hook up 4 drives on one strand without having to twist the cord That was really sweet. While running it is very quiet till it gets to about 60% for me then the fan starts but even then it isnt as loud as my other silverstone strider 1000. It is also 80 plus gold which means it is only going to use what it needs and not run your electric bill up like some others that arent as good but cost just as much. This power supply isnt cheap others are right but when you compare it to other fully modular power supplies it is right on par as to the cost and amps. I have dealt with Coarsair warranty before a couple of times and it isnt that hard to do but it does take longer then they let on. I was told a week the first time and it took 3 weeks. The next time it took a little longer So if you buy this with a rebate make sure to test it first.

Pros: Quiet, clean install, worked well for 8 months. See below. Corsair's RMA system The system was a i7 3770K @ 4.5 with two 7950s Crossfire

Cons: Unit failed after 8 months. Corsair has a great RMA system. They were very helpful. Sent the failed unit in and in 4 days had a new unit completely replaced. I did not have a receipt because this was a review unit. So warranty is transferable

Overall Review: They got 4 stars for there RMA policy. They were fast and helpful. 4 days turn around. It only cost me $13 to ship it in.

Pros: - Very fast shipping by NewEgg. PSU came very well packed and protected from damage. - While operating, this PSU is silent until about 40% load at which point the fan activates at low RPM, low noise mode. The fans’ RPM’s pick up at more than 70% load. - Fully modular PSU. Use the cables you need and stow away the unused cables away for future use. Each modular port is clearly marked and will only fit cables it is intended for. - Additional connector for Corsair Link hub, which allow monitoring and control of case fans and case LED lights. Corsair Link hub is not included with this PSU and bust be sourced directly from Corsair. - A five year warranty is unusually generous for this type of hardware. - Lifetime access to Corsair’s technical support. - Compatible with newest 4th generation Intel Core processors. - 80PLUS Gold certified, delivering over 92% energy efficiency. - Multiple safety mechanisms provide over-voltage, over-current protection, under-voltage protection, short circuit protection, over power protection and over temperature protection.

Cons: - I am hard pressed to find a con. The PSU sells at premium price but the PSU is well worth its price.

Overall Review: - I installed this PSU in Corsair Carbide R300 ATX Mid-Case. The computer case has a special vent on the bottom which allowed me to install the PSU at the bottom of the case, with the fan facing down. This way, the PSU draws fresh air through filtered vents underneath the case. - My build contains: MSI Z77A-GD65 Gaming MoBo, Intel Core i5-3570K CPU, Crucial Ballistix Tactical 2x8GB RAM, MSI GeForce N650-TI Graphics card, three 2 TB hard-drives , system SSD. I also have BD/DVD burner combo, two PCIe add-on cards and three PWM case fans. I use external hard-drives and another external BD burner. All in all, the system’s needs are not even close to maximum 650 watts this PSU can provide. However, in my previous builds, I liked to have a PSU that provides about twice as much power as the components need. This might be an overkill, but it will allow for future expansion. Also, I have seen a lot of generic “beige” power supplies that have failed because they were underpowered for the components they were powering and were constantly run close to their capacity. - The RM650 PSU is silent most of the time. When the fan does come on, it stays quieter than any other PSU I have had before. - This PSU appears very sturdy. Its components fit together well and the PSU was very easy to install. - The cables are “ribbon” style and have a nice gauge. They are bit firm at room temperature. I like to think it’s because they have a bit more copper inside them for extra conductivity. However, the cables mold just fine and keep the shape better than thinner cables. I had absolutely no problems bundling and zip-tying all my cabling with the included zip-ties. The length of the cabling is more than adequate for my rather large mid-ATX case. The MoBo cable length is 610 mm, CPU cable length is 650 mm and PCI-e cable’s length is about 750 mm. - This PSU is a review unit. After using it for close to two weeks, I am very impressed by its quality and silent operation. Despite its slight price premium, I highly recommend this unit. In the end, the PSU needs to provide stable and ample power to the whole system. Corsair RM650 is a premium product and it's performance will not disappoint you.

Pros: 1. It is modular. 2. Quiet 3. Good for cable routing 4. Easy installation 5. Survived two torture tests 6. Has all the cables needed - except for the optional corsair - link USB cable. 7. No LEDs or flashy trash to bug you.

Cons: 1. The 24 pin connector at the power supply comes in three sections. None of the three may a positive lock - clicking sound when plugged in. 2. No corsair -link USB cable.

Overall Review: I tried this in two different machines. The first was an Ivy Bridge system. It has a i7 3700K overclocked to 4.6 volts on air cooling. There are two 7870 in crossfire. There lots of other goodies. According to the power supply calculator, I am right at the edge of being able to use this power supply - within 10 watts or so. I used this machine to do two different tests. The first was to run Prime 95 overnight. The fan did spin up after about 5 minutes. Otherwise no issues. I stress tested the GPUs as well. No problems. My final test was to put the power supply in another machine - my windows home server. It does not have good airflow. It sits in a small confined space. THis is not an Atom machine, rather I built it myself - it is has a AMD2 socket board with a 4 core cpu. This uses a stock cooler and one fan. There are 4 hard driver in the machine as well. The machine never gets turned off. It runs in its little box in old computer desk. The door is closed, and you can feel the heat in there, when you open the door. The computer runs 24/7. The power supply has spent the last two weeks in this environment. No problems what so ever. The biggest issue that I had was the 24 pin connector. All of the cables that you plug int to the psu lock in place, and there is an audible click. You are certain that there is positive connection. The 24 pin connector does not does this with its three 8 pin blocks that go into the psu. It was hard to get them in, just because they had to really be lined up at the same time. The issue was that there was no positive lock - no matter how hard I pushed. The first time I used it, the machine would not post. I finally figured out that it was one of these 8 pin connections. I am not a small guy. I am 6'4" and I am quite strong. Therefore, I could see this being an issue for others. The Corsair link idea is great, but it takes an adapter cable to connect to a USB header. It is a very interesting idea. Would have been nice to try out the functionality of the C-Link. Corsair includes all kinds of other cables, why not add this one. Beyond these two complaints - no issues whatsoever. The 5 year warranty is nice as well.

Pros: Solid and Silent. Made by CWT, Gold Efficiency, 5yr Warranty Plenty of, all black, Flexible Cables Corsair Link Corsair Fan 54A 12V Single Rail for 650W of 12V power

Cons: Yellow, meh... Cheap clear plastic bag for extra cables. Cheap packing material.

Overall Review: Fan turns on at 40% load. 4770k overclocked to 4.5GHz and under Prime95 stress for over an hour wasn't enough to enable the fan. The PSU stayed cool to the touch as well. I own a Rosewill Capstone 650M which is manufactured by Super Flower. It has extremely similar specifications to this Corsair. However, it has 2 additional years on the warranty, is packaged better, and comes with a much nicer bag for storing extra cables. It is just as quiet under load and is only $99. It's 2 disadvantages are not being 100% modular and it obviously does not support Corsair Link. If you don't fancy Corsair Link it is a viable option for a few dollars less. I was out of town for my honeymoon and have not had ample time to extensively test the PSU. This will be my initial review, and once I receive my R9 290 I will be back with more heavy load information along with some about CorsairLink. Specs for Corsair Power Supplies: http://www.corsair.com/us/media/cms/manual/corsair-psu-spec-table-091813.pdf

Pros: It's a corsair power supply, might sound like a statement from a "fanboy" but it is a name you can trust. I've been using corsair for a long time and have not had a power supply fail to date. Gold 80+ 100% modular, I personally prefer the 100% over the semi modular ones. It makes it a lot easier for cable management or making custom cables. It was tested in a computer running 2 HD6950s, 2500k , single HDD, p8p67 pro, and 16gb of ram. From the wall 100% load i pull at most 350w. This power supply does a great job supplying clean power to my computer. Corsair link is nice from what i've seen in the ax760i, will comment about that more below. The cables were more than long enough for my rc690, i could see the length being a potential problem in the bigger full tower cases though.

Cons: Corsair link is a great product in theory, it provides the end user with more info about his or her product while running. The implementation by corsair has been horrible. The ax760i had a proprietary dongle coming off the PSU. The RM 650 has a proprietary cable coming off of the psu which i have no clue what you need to purchase to get info from it to your computer. Super simple solution corsair, just have a single usb header coming off the psu and a single cable going to a mobo usb header. Keep everything internal. You're loosing one star for these proprietary shenanigans. Make it user friendly

Overall Review: At the price point this is a great 100% modular gold 80+ PSU with a solid manufacturer and warranty to accompany it. I would gladly use this in my computer and recommend it to clients or use it in builds.