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Antec > 
Item#: N82E16835209078

Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

  • 6.3" (H) x 4.7" (W) x 1.0" (D)
  • RGB LED
  • powerful PWM fan
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Learn more about the Antec KUHLER H2O 650

General

Brand
Antec
Series
H2O 650
Model
KUHLER H2O 650
Type
Liquid Cooling System

Pump

Pump Dim.
4.7" x 2.0" / 120 mm x 50 mm (Fan+Pump)

Radiator

Radiator Dim.
6.3" (H) x 4.7" (W) x 1.0" (D) / 159 mm (H) x 120 mm (W) x 27 mm (D)

Features

Features
The Antec KUHLER H2O 650 delivers high-performance liquid cooling for your CPU in a quick, easy-to-install package.

Unlike traditional liquid cooling systems, this self-contained unit comes prefilled and requires no maintenance.

The extra large pump circulates coolant through optimized water channels, while easy-bend flexible tubing allows the KUHLER H2O 650 to be installed in nearly any orientation.

In addition to easy installation, a powerful PWM fan pushes air through directional blades and channels it through the radiator for optimal cooling.

Included in the box is an air duct that reduces static pressure which in turn, allows air to flow out of the case efficiently.

Lastly, integrated firmware automatically adjusts fan speed and changes the RGB LED based on temperature.

Engineered for maximum performance, the Antec KUHLER H2O 650 delivers liquid cooling performance at an air cooling price.

Quick Info

Warranty

  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years


Customer Reviews of the Antec KUHLER H2O 650

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Showing 41 of 41 reviews - Clear Filters

  • Anonymous
  • 12/14/2014 9:07:30 AM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

3 out of 5 eggsFan did not work

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: Seems well made.
Has RGB light on heatsink that changes color with temperature.

Cons: Fan defective.

Too difficult to install heatsink screws.

Other Thoughts: Fan not starting is a common issue when not plugged in correctly and BIOS not set correctly. Tried everything per instructions. Pump and light work -- not fan.

Cannot RMA with Newegg because I had cut product code off box for Rebate. Have ticket in with Antec for a replacement. But, no answer as of this writing.

Difficult aftermarket heat sink screws are not uncommon. But, some brands are actually pretty easy -- why not all? Easy installation should be a key part of the design. Just make the startup screw thread a bit longer (or spring a bit shorter), in this case.

Did you find this review helpful? Yes No

  • Dethrick S.
  • 12/1/2014 2:45:04 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year

5 out of 5 eggsGreat Cooler with some issues

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: The cooler is great - maintains 30 -35 C with around 8 apps running at the same time.
Nice Light
Fits case fine

Cons: Difficulty installing... Boy was that a tough install. I was sweating my tail off.
The noise is a little loud.

Other Thoughts: I initially went to the store to get a well known heatsink for my AMD 6300 CPU, I found this one on sale for 20 dollars, why not??? Purchased it, took it home for the install. Took a while to install, but it

Did you find this review helpful? Yes No

  • Brandon M.
  • 11/12/2014 11:54:23 AM
  • Tech Level: High
  • Ownership: more than 1 year

4 out of 5 eggsGreat for the price

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: I bought this at my local computer store on sale about a year ago, and it is a great liquid cooler for a first time buyer. Everything is prefilled, and it is pretty much plug and play. The hardest thing was mounting the fan and radiator. It has a bit of a strange screw layout. It did fit my fan mount with a bit of coercing, but it was not easy. I have installed this fan on another computer and it had the same problem. It does work, but I'd get some rubber o-rings and ditch the screws you get it the package for your own because you will be screwing it in VERY TIGHT! Compared to other prefilled liquid systems the hoses are very flexible. I managed to fit it in a midsize case with a GTX 660, which took quite a few zip ties to get some cables out of the way. It plugs in to the CPU fan connection on your motherboard, of course. You cannot vary the speeds of the fan directly on the unit, but you can from the BIOS screen by modifying the CPU fan speed. The LED temp indicator on the cold plate unit is a very nice touch. It is easy to monitor the approximate temp on my PC while overclocking or playing a graphic intensive game. The hottest it has ever gotten was while overclocking and running a large video game, but it still functioned fine. I'd blame the graphics card for a good chunk of the heat. There are some minor downsides, but all in all you get a very solid unit for the price you pay. I will definitely recommend this to any prospective PC builders in the future as a budget cooler.

Cons: Strange mounting config
Runs a bit loud, but not too much of a nuisance
Somewhat difficult to put on CPU/motherboard mount. Takes your time when installing it!

Other Thoughts: As with any liquid cooling system, take your time. I've installed quite a few and I always spend at least 45 min installing, connecting, and double checking the connections. Depending on your case set up it may be a good idea to take the motherboard out, but ONLY DO THIS IF YOU HAVE TO! Most cases will have the area behind the CPU open when you take the back off, but I've come across some without a hole.

Happy building!

Did you find this review helpful? Yes No

  • Erich O.
  • 11/8/2014 10:48:04 AM
  • Tech Level: Average
  • Ownership: 1 month to 1 year

4 out of 5 eggsGreat with i7 4820k 3.7GHz

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: The temperature color distinctions are a great addition. Very quiet.

Cons: Hose and chassis for the radiator were difficult to maneuver within my ANTEC full tower.
It seems like the fan speed determines the color, not the temperature of your CPU.

Other Thoughts: I decided on the single fan instead of the double fan ONLY because of the price difference. In hind-sight I should have gone with the double. I have a push-pull setup, but on heavily modded games I get the temperature up into the deep pink range. (for all you uninitiated it goes white, light blue, blue, purple, pink, deep pink.... and I can only assume a red follows) I have tried to push its limits, and as a nod to my processor I can run a stable RPG with over 100 mods, most of which are graphics improving, without overclocking. This fan keeps it cool enough but you will hear it when it gets to the pink range in temperature/ fan speed. On an added note, the Antec case I have (with 6 fans) seems to get air out of the case too well, preventing cooler air from reaching the radiator.

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  • Keith S.
  • 10/17/2014 8:26:59 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsForm VS Function

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: this build went much better than expected for a $50.00 case. My build issues were all about the power supply and its short cables. it is incredibly quiet. It has fan controllers for up to 6 fans, they are easy to find. Case has 5 120mm fans that are very quiet even on high settings

Cons: I was not happy with the 2.5" mounting system. it left the ssd quite loose. some double sided foam tape will help this out a lot on the tray side

Other Thoughts: I barely had enough 8 pin motherboard power cable for my GA-79X-up5 motherboard. it was very handy that the top pops off and the rear fan was right over the plug to aide in getting the plugs in.

0 out of 9 people found this review helpful. Did you? Yes No

  • William S.
  • 10/16/2014 9:36:06 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGood Value!

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: Small
Not too loud
Good Cooling and Heat Transfer
Tubing is nice and flexible
Good Looking

Cons: Not for serious overclocking
Wish the fan was not mounted like it is

Other Thoughts: Bought this for an inexpensive AIO to put on and overclock a Pentium G3240 Anniversary chip. Managed to get 4.4ghz stable while keeping temps under extreme load down to the upper 70's (Celcius). Not bad for an inexpensive AIO like this and it honestly spins the fans nice enough to keep noise levels down under all scenarios. Like the color changing LED that tells the temps as it looks great through the side view panel that my client appreciated it.

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

  • Scott F.
  • 10/9/2014 7:47:22 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsIneffective

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: Looks slick, install wasn't too difficult. Build quality is decent.

Cons: This did not perform well with the intel i7 4820k, perhaps the 1250 would have been a better choice with twice the radiator surface. I would suggest it is probably not a great bang for buck for this reason.

Other Thoughts: I'm replacing mine with an air cooler in the same price bracket.

Manufacturer Response:

Hi Anonymous,

A 240 rad is definitely better than a 120mm rad. More surface area, the better.

Deciding on rad size really depends on what you'll use it for, if you are overclocking the CPU, the kuhler 1250 is a better choice.

If you're running it on stock clock speed, it should be fine.

A 120 with a single fan is performing at 100%, adding a push/pull setup on that would be ~115%, and a 240 with just push would be at around 200%. You could run slower fans on the 240 and still get an even or better performance. Plus, slower fans = less noise.

Thank you,

Antec Team

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  • Ho C.
  • 10/5/2014 12:01:36 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsdoesn't work

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: The light's kind of cool.

Cons: Horrible. I thought this was an upgrade. Computer overheats and hangs. Often, when I come home, I see the red light glowing and the computer is non-responsive. After I hit the reset button and reboot, I see the CPU temp at 70+C. The chassis temp at ~30C.
If I do anything at all on the computer, the CPU temp goes to 60's and sometimes 70's C within seconds. I can see it go up a degree every second or so. This is with the CPU at ~20%. Just turning on the Media Center or video streaming does it. 120mm fans screaming it 2700 RPM.
I have it set up with dual fans (push/pull) and the air coming out is barely warm, only at the bottom. I am convinced there is little coolant in the system or it's blocked. I didn't think I needed to fill this before use.

Other Thoughts: Mail in rebate makes returning impossible.
I'm running Vishera 8 core and it does run hot, the whole point of liquid cooling.

Manufacturer Response:

Hello Xalaga,

Before you left your computer running, was the kuhler working properly after you installed it?

It could be different things that have caused this.

1. Installation - double check if the water block is make full contact with the CPU

2. Fan connector - the fan connect coming from the fan itself is the one probably connected directly to the MoBo. Make sure the one labeled with "power" is the one connected to the 3pin on the board to automatically regulate the speed of the fan, also this will cause for your pump not to circulate any water.

Thank you,

Antec Team

Did you find this review helpful? Yes No

  • Francis M.
  • 10/3/2014 12:53:27 AM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsWorks very well.

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: Makes my processing unit cooler, I had lots of heating problems at first but this solved all of them.

Cons: Makes a bit of noise but I don't really mind it.

Other Thoughts: Maybe one of the best addition I got for my gaming PC.

Did you find this review helpful? Yes No

  • Benjamin G.
  • 9/2/2014 9:07:39 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year

4 out of 5 eggsKuhler 650

This review is from: Antec KUHLER H2O 650 Water/Liquid CPU Cooler 120MM

Pros: Packaged well
Self contained unit
low mounting height on MoBo

Cons: Difficult mounting with included backplate

Other Thoughts: This installs well if you use the original backplate that comes with your mother board. The included kit is touted as being super easy to install, but the screws do not make it in to the mounting holes and the metal inserts fall out. Also, the retention springs are way too stiff and inflexible. I ended up using the stock backplate option and the shorter screws and it worked fine.

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

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Item#: N82E16835209078
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