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COOLER MASTER HAF series RC-912-KKN1 Black SECC/ ABS Plastic ATX Mid Tower Computer Case

Item #: 9B-11-119-233  |  Mfr. Part #: RC-912-KKN1  |  UNSPSC: 43201601
$69.99 Save: $10.00 (14%)
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20+ In stock. Limit 5 per customer.
  • SECC/ ABS Plastic ATX Mid Tower
  • 2 x USB 2.0, 1 x Audio, 1 x Speakers Front Ports
  • 2 x 120 mm fans, 1200 RPM, 17 dBA

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Great case for my first build

5 out of 5 eggs
-well written/drawn instructions
-lots of space
-well build
-easy to disassemble
-super bada** looking
-can ...
— Thomas 2/10/2011

An amazing bang for my buck.

5 out of 5 eggs
When I finally got it home I realized that the HAF 912 is very huge for a little guy. It is wider than my CM 690 II, but ...
— 9/9/2010

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

Cooler Master HAF 912 Mid Tower Chassis

Cooler Master’s HAF 912 further enriches the HAF series by adding a compact, yet fully featured mid-tower solution for enthusiasts and budget conscious gamers alike. Its seemingly small exterior supports a plethora of interior features such as twelve devices and high end GPU cards.

The HAF 912 embodies the rugged aesthetic and qualities of its brethren while remaining attractively priced. Its traits more closely resemble that of a mid to high-end case than that of other cases in its price range. The HAF 912 pays tribute to the legacy of HAF 932 & HAF 922 in ease of installation, high airflow, and compatibility with water cooling hardware.

HAF 912 is the most compact solution in the HAF Series that still provides full desktop tower component support.
The HDD cage can be easily removed to accommodate long high-end graphics cards. Rotate the cage 90 degrees to adjust your system airflow and cable management setup as you need.

Technical Specs:

Model RC-912-KKN1
Color Black
Dimension 230 x 480 x 496 mm / 9.1 x 18.9 x 19.5 inches
Weight 17.8 lbs
Material SECC / ABS Plastic
5.25" Drive Bay 4 Exposed
3.5" Drive Bay 1 Exposed (converted from 5.25" bay) 6 hidden
2.5" Drive Bay 2+2 (converted from 5.25" bay) 4 hidden
I/O Panel USB 2.0 x 2, Audio x 1, Speaker x 1
Cooling System Front: 120 mm fan x 2, 1200 RPM, 17 dBA(one is optional,can be swapped for one 200mm fan)

Top: 120 mm fan x 2 or 200mm fan x 1(optional)

Rear: 120 mm fan x 1, 1200 RPM, 17 dBA

Side: 120/140 mm fan x 1 (optional)
Expansion Slots 7+1
Power Supply ATX PS2 / EPS 12V (optional)
Warranty 2 Years
UPC Code 884102009877


  • newegg Superior Expandability and Expansive Space The Cooler Master HAF 912 boasts 4 exposed 5.25", 1 exposed (converted from 5.25" bay) and 6 hidden 3.5", 2+2 2.5" / 1.8" HDD/SSDs drive bays (via the 3.5’’ to 2.5’’ adapter) as well as 7+1 PCI expansion slots for increased expandability. 3.5’’ HDD cage can be rotated 90 degree or removed to fit long graphics cards. The bottom mounted 2.5-inch drive cage can also be mounted on top of the bottom half of the 3.5-inch drive cage if more room is needed at the bottom of the case.
  • newegg Excellent Cooling Solution – 200mm Megaflow Fans and Water Cooling Support The Cooler Master HAF 912 features one front and one rear 120mm fans and support another front 120mm (two front fans can be swapped for one 200 mm fan), one side 120/140mm and two top 120mm ( or one top 200mm ) fans for peerless air cooling performance. The HAF 912 also has pre-drilled outlets and retaining holes, and accepts two external radiator 120mm fans for building water cooling system.
  • newegg Flexible Cable Management The 16mm width between side panel and motherboard tray provides sufficient space for hiding cables. HDD cages with holes allow easy cable routing while modular notches tie cables neatly, leading to better internal airflow.
  • newegg CPU Retaining Hole and Removable Dust Filters CPU retaining hole allows easy heatsink installation and removal. The dust filters on the bottom and front cover block dust outside of the enclosure and is removable for easy cleaning.
  • newegg Support for Long Graphics Card The Cooler Master HAF 912 supports high-end graphics cards like ATI HD 5970 and NVIDIA GeForce GTX480 after the removal of the 3.5’’ HDD cage.
  • newegg Convenient Front I/O Panel and Top Platform Convenient front I/O panel offers easy access to two USB 2.0 and two audio ports. Top platform provides room for your personal belongings, like your cellphone or keys.


Learn more about the Cooler Master RC-912-KKN1


HAF series


ATX Mid Tower
Case Material
SECC/ ABS Plastic
With Power Supply
Power Supply Mounted
Motherboard Compatibility
Micro ATX / ATX
With Side Panel Window


External 5.25" Drive Bays
External 3.5" Drive Bays
1 (converted from 5.25" bay)
Internal 3.5" Drive Bays
Internal 2.5" Drive Bays
2 + 2 (converted from 5.25" bay)
Expansion Slots
8 (7+1)

Front Ports

Front Ports
2 x USB 2.0, 1 x Audio, 1 x Speakers

Cooling System

120mm Fans
1 x 120 mm front fan, 1200 RPM, 17 dBA
1 x 120 mm rear fan, 1200 RPM, 17 dBA

Physical Spec

19.50" x 9.10" x 18.90"
17.80 lbs.


Front I/O for easy access

Top platform for personal belongings

CPU Retaining hole

Water Cooling outlets

Supports two 120mm radiator fans

Backup screw holder

7+1 slots for increased expandability

Two 3.5" or 2.5" / 1.8" HDD/SSDs

Supports high-end graphics cards like ATI HD 5970 and nVidia GeForce GTX

Removable dust filters on the bottom and front cover

Cooling System:
-Front: 120 mm fan x 2, 1200 RPM, 17 dBA (one is optional,can be swapped for one 200mm fan)
-Top: 120 mm fan x 2 or 200mm fan x 1(optional)
-Rear: 120 mm fan x 1, 1200 RPM, 17 dBA
-Side:120/140 mm fan x 1 (optional)

Manufacturer Warranty

2 years limited
2 years limited

Customer Reviews of the Cooler Master RC-912-KKN1

Do you own this product? WRITE A REVIEW

5 out of 5 eggs Based on 1534 Reviews

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  • (1365)
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  • (46)
  • (1)
  • Anonymous
  • Verified Owner

4 out of 5 eggs Great Case, but...

Pros: Roomy, plenty of space behind motherboard to route cables for a clean presentation. Drive cages are easy to remove if you don't need them. Fans are super quite.

Cons: No USB 3.0 on the front panel. Not the end of the world but a surprise when I went to connect the header.

Bottom Line: If it wasn't for the USB 3.0 issue, this would be a 5. Good case otherwise.

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  • Nate
  • Verified Owner

4 out of 5 eggs Cooler Master HAF 912

Pros: Roomy, hassle-free cable management, numerous cooling options

Cons: SATA cables provided with HDD can only extend to a certain point if you have a uATX motherboard. Even when the HDD is located in its closest position to the board, the connection will be a tight fit.

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  • Anonymous
  • Verified Owner

4 out of 5 eggs Good Case - louad

Pros: Case is nice and sturdy.
Good bit of cable management room

Cons: Loud fans - I am going to have to replace them.

Front panel fan's cord is not long enough to reach motherboard, forcing you to plug into power supply so you can't manage it's speed at all.

One of the black pegs that the power supply is suppose to sit on was missing.

Bottom Line: I bought 2 of these cases for the new computers we were building for the house. I don't regret buying the cases and I think they are real nice cases overall. Just buy while knowing you may end up feeling the need to buy some fans to reduce the noise.

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  • Verified Owner

5 out of 5 eggs Cool Matser HAF-912 Black

Pros: Incredibly HIGH QUALITY case for the price... Impressive actually... I purchased this for a Client as I build systems as part of my own business and I thought it looked little hoaky but the real world look impressed me.

Cons: Maybe the Looks? I dunno it's speculative - there are no real cons not for the price.

Bottom Line: No Powder Coating on Inside or Back, this model has no USB 3.0 on the case directly. Get the BLUE model if you want USB 3.0 if you want Powder Coating you can get the Pro model

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

  • Ben

4 out of 5 eggs Great Budget case

Pros: Looks great
Tons of features
Good Layout

Cons: Inside is not painted
Not a lot of cable managing

Bottom Line: It's a great case especially for the price. It has a lot of features I couldn't find it other cases for this price point. The only thing that really bothered me was the inside is not painted but it's not that big of a deal.

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  • TheVelvetBulldozer
  • Verified Owner

4 out of 5 eggs Decent Case

Pros: Very roomy and stylish looking. Dual 200mm fan support. Many extra bays for hard drives and anything else you can imagine.

Cons: Side panel came dented from the factory. I pulled it out of the box and there was a big dent on the side. Big Bummer. Secondly, and this is my fault. The case is unpainted gray metal on the inside. Very Blah. I wished I would have realized this as I would have bought a case that had a black interior.

Bottom Line: This is my first build in over 7 years and this case is just decent. There are many other cases in this price range that have more std features. Examples: Black interior and usb 3.0 support on front panel

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  • gadgetman
  • Verified Owner

5 out of 5 eggs You Did It, Best Tower EVER!

Pros: Strong, durable, lots of space has lots of vents air flow is perfect i am using the 280x R9 graphics card its a very big and long card and it fits in this tower with no problems
all you have to do is remove the hard drive bay and your all set its was very quick and easy to install my board and card.

Cons: nothing bad to say about it, its a great well made tower

Bottom Line: its a real good tower cool master did a really good job its not cheap it feels strong and it will last a long very long time the price is worth it, really great buy i recommend this tower if your building a monster gaming pc

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  • Anonymous
  • Verified Owner

5 out of 5 eggs good inexpensive case

Pros: I purchased this case recently for a machine I was building for a friend. In the past, I've built a number of computers with this case. I love it! There's plenty of room, it's well constructed and there's plenty of air flow. I really can't point to one thing wrong with this case. Even the warranty service with Cooler Master is above the bar for normal case manufacturers. My work got one from a local vendor and it was damaged. The vendor refused to replace it but Cooler master was happy to resolve the issue.

Cons: none

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

  • Scott

5 out of 5 eggs Good case

Pros: Plenty of room, and much better air flow than any case I've had in the past. It was easy to transfer my MB, drives, and power supply from the old case to this one. It came with all of the screws I needed, along with the quick install sliding thingies for the hard drives. Packaged pretty well for shipping, too.

Cons: Needs something more than carpet under it for good air flow to the power supply. I ended up putting a piece of wood under the case to ensure that air could move under there.

Bottom Line: It was a little tight on the side of the case for the SATA cables. I had to make sure I used right angle connectors so there was no pressure on them from the side panel. The case light is not too bright, and the fans are quiet. I also appreciate how the power and reset buttons are near the top front of the case, out of reach of my cat!

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

  • Anonymous
  • Verified Owner

5 out of 5 eggs Nice Case!

Pros: I love the room in this case.

I like all of the fan slots and breath-ability.

What else would you expect from Cooler Master!

Cons: Some of the power and fan cables are hard to reach and untwist out of the box. It takes small fingers or some time. Beyond that, I don't really have any cons about this case.

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