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Item#: N82E16811119252

Cooler Master Cosmos II - Ultra Tower Computer Case with Metal Body and Hinged Side Panels

  • Steel ATX Super Tower
  • 2 x USB 3.0 / 4 x USB 2.0 / Audio / 1 x e-SATA Front Ports
  • 3 External 5.25" Drive Bays
  • 13 (2 from X-dock, Middle cage for 5 HDDs, Bottom cage for 6 HDDs) Internal 3.5" Driv

This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The COSMOS II Ultra Tower features a streamlined design accentuated by a pair of distinctive handles like on other. Adding to its uniqueness is the smooth brushed aluminum side panels which unlock and swing open like the doors of a luxurious race-car.

Hidden behind the front slide cover lies a stack of hot-swappable drive bays. The black interiors provide enough space for oversized XL-ATX System Boards equipped with 4 double width graphics accelerators. A second slide cover on top hides the Advanced Control Panel to manage up to 10 fans and their respective LED lights. The combination of its elegant looks, numerous expansion options and features make the COSMOS II a "Dream Case".


  • newegg Performance Meets Style The race-car inspired side panels have become a signature for the Cool Master COSMOS series. COSMOS II delivers a sense of luxury and elegance with its smooth brushed aluminum and steel side panels along with stylish round handrail and stand. By focusing on a "racing", "speed", and "luxury" theme, the COSMOS II not only offered a powerful and efficient system enclosure, but a true piece of art.
  • newegg Great Expandability Ample inner space can support super high end extra wide and long XL-ATX mainboards, 4 extra long high end dual-width VGA cards (up to 385mm) or 2 super high end triple-width VGA cards, extra long PSUs (up to 250mm), and accommodate up to 13 HDDs or SSDs with ODD, HDD and SSD hot swapping.
  • newegg Individual Chambers Individual cooling chambers enable advanced air flow and temperature management. The lower chamber features a second HDD/SSD cage, a dual fan bracket, extra long PSU rail, and enough space for a water cooling radiator.
  • newegg Fan Array with Removable Dust Filter on Vents COSMOS II supports up to 10 fans (5 pre-installed) that can be arranged into 4 separate fan management groups. The fan speed and LEDs can be managed using the advanced control panel at the front of the case. Clip on air filters protect the system from dust blocking heatsink and fans, prolonging the system lifespan.
  • newegg Water Cooling Support The retention holes for water tubes at the rear of the case and reserved space and mounts for water cooling radiators allows easy liquid cooling set up and maintenance.
  • newegg Advanced Control Panel The top control panel offers easy access to fan management and fan LED on/off switch. Enjoy hassle-free, high speed connection to a variety of peripherals with one e-SATA connector, two USB 3.0 ports, four USB 2.0 ports and audio in and out jacks on the upper I/O panel.

Learn more about the Cooler Master RC-1200-KKN1

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

Customer Reviews of the Cooler Master RC-1200-KKN1

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  • Raby J.
  • 10/4/2015 12:55:58 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsThis station is now the ultimate power in the universe! I suggest we use it!

Pros: Takes a huge motherboard and a huge power supply with no problems. Also, was able to endure a huge CPU fan. My PREVIOUS full tower did not have enough room for a bigger CPU fan (the door wouldn't close). This new tower obviously does not have that problem. Everything fits with plenty of room left over.

Cons: -If I get angry, it is very difficult to pick up the case and toss it out of the window. The case is too heavy to casually pick up, and too big to fit through the window. I suppose this is a pro instead of a con.

-Properly installing the fans can be difficult at first. A more detailed instructions manual might have been good. But a normal person can still figure it out.

-Too bad it didn't come with more fans included. I ended up purchasing additional fans.

-The size of this case has made my cat develop an interest in PC towers, and she now sits on top of this case.

Other Thoughts: If you're the type of person who continously upgrade your PC overtime, you might as well invest in this case. You'll have plenty of room, and never have to worry about future parts being too big to fit. The only thing you have to worry about is if you have enough room in your house for this case.

Did you find this review helpful? Yes No

  • Nikolai G.
  • 8/23/2015 8:14:15 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsBrutal Case

Pros: Ive installed 13 fans so far!! and I'm capable of fitting 4. its control fan LED system is excellent for amazing ventilation. has excellent wire space management. Water cooling is customizable and comfortable. great accessibility to the insides and overall LOOKS BEAST!!!!!!! great air ventilation for a full push pull configuration.

Cons: Its a killer back breaker. its weighs about 50 pounds the case its self but as your installing all the parts you're adding on the weight. All together, a finished computer would way about 90 or 100 pounds.
i also wished it would have wheels to move it easier but you gotta do a whole gym workout to move it and open it up to customize it.
Im 6 feet and could left the case but for you small guys out there, PLEASE use an extra set of hands when lifting and turning. the UPS guy had trouble getting it out his truck.

Other Thoughts: ALSO, if you have the space to fit this bad boy somewhere, you set to go. in my case it wont fit on my desk or under it.

Did you find this review helpful? Yes No

  • Matt E.
  • 8/20/2015 3:48:35 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGood lord what a case!

Pros: *This thing is....HUGE....It has more room than you will ever need for anything you put into it.

*The air-flow/routing in the case is superb.

*Both side panels come off with absolutely no trouble (very simple slot/pin/slide setup) and lock securely in place with minimal effort.

*Two true hot-swap bays on the front for drives if you need them.

*Excellent cable-management

*Had lots of room to install a Corsair H110i GT CPU liquid cooler (top mount, the radiator goes inside the case and the fans fit in the top portion under the dust-cover).

*Has two tubular rails at the top and bottom, very easy to carry/move.

* Very easy to relocate/add fans in the case at several attachment points.

Cons: None that I can see.

Other Thoughts: Full system specs :

Cooler Master Cosmos II case
EVGA X99 Classified motherboard
64 gigs corsair dominator PC2800
i7-5960X O/C'd to 4.5 ghz
Samsung SM951 (M.2 package, 256 gigs)
Windows 10 PRO
EVGA GTX 980 Ti hybrid

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

  • 8/17/2015 5:12:27 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsReceived messed up in two ways

Pros: -Lots of room with support for multiple radiators
-Looks cool

Cons: -Case arrived with a small chunk of metal missing (hole) on the left side panel which blemishes the brushed aluminum beauty
-Also when I opened the left side panel, noticed right away the 2nd push button from the top was installed upside down, which I don't think I can fix myself
-Thought I could live with these things but I've started spending more and more money to make the cleanest build I've ever done (like sleeved cables, lighting, etc) and it's irritated me enough to come on here and post a review about it
-The top holes in the case do not perfectly line up with 360mm radiator (have to do radiator inside, fans outside on top with long screws coming down to attach all together). You can install two 120mm fans no problem, but the third one you can't. The holes are slightly off and it looks like drilling is required to be able to install the third 120mm fan on top.
-Also, to install 360mm radiator inside up top, there are two metal bent tabs you have to pry upwards to be able to get radiator to fit. I believe these tabs are like a way to leave space for the back of a blu ray drive that you may want to mount in the top 5-1/4" bay.

Manufacturer Response:

Good Morning Thomas,

I apologize for the inconvenience as you can send me photos of the defective chassis through our CM Fanzone along with your purchase invoice and serial number at the link below as well for further assistance.

I look forward to your response.

Felinni M.
CMUSA Support

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

  • Joel A.
  • 8/2/2015 3:02:13 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsDidnt come with accessory pack

Pros: Seems like a nice case. To bad I can't build it because it didnt come with all the parts.

Cons: Missing the parts required to actually use it.

Other Thoughts: When you spend this kind of money on a case you should expect it to actually come with everything in the box. Instead the entire accessory pack was missing. This means all the mountings, screws and keys need to actually build my darn computer.

The worst part is that when i contacted NewEgg they just credited me $10 because they don't carry the accessory package in stock. I spent over 2.7k on a new computer and now I have to wait another 2 weeks just to get screws to mount my motherboard. How can a top of the line case not come with its parts? And Newegg doesnt stock replacements for it?

Totally let down and a little ticked off.

Manufacturer Response:

Good Morning Joel,

I apologize for the inconvenience as this is very odd to not include an accessories kit. You can apply for a Parts Request through our CM Fanzone along with your purchase invoice and serial number at the following links below so we can send you a complimentary accessories kit under warranty. I look forward to your response.

Felinni M.
CMUSA Support

1 out of 2 people found this review helpful. Did you? Yes No

  • TAM L.
  • 7/10/2015 5:25:52 PM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsGood !

Pros: I love it !

Cons: Heavy and slightly damaged at right rear side. But it's ok

Other Thoughts: Missing 120mm fan for Mid. HDD

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

  • Marissa J.
  • 5/12/2015 8:53:25 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsReceived with minimal damage

Pros: Great case love it.

Cons: Received case slightly damaged in the back where the plastic is attached to the metal. The control panel for the fan speed buttons is raised and not sticking down properly, it sticks for a few seconds when you push one of the fan speed buttons but separates again shortly thereafter.

Other Thoughts: Not sure yet what my options are regarding these issues. For such an expensive case it should be flawless.

3 out of 3 people found this review helpful. Did you? Yes No

  • Anonymous
  • 5/5/2015 6:03:05 PM
  • Tech Level: Somewhat Low
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsA monster!

Pros: Extremely huge.
Easy to access your parts
Good and sturdy design
Built to last

Cons: None I have seen even though I have just gotten it will update once build completed

Other Thoughts: I do have to say even thought I didn't put this in the cons, I thought it would have come in a big shipping box but nope just the normal package box. The box did arrive within 4 days which was great! But it did have some I would say I guess dents? Or just worn cardboard but it still looks great.

Again I will update once I have completed the build.

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

  • Thayne C.
  • 4/16/2015 7:05:13 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsMonolithic, sexy and sturdy

Pros: This is the quintessential show piece for any PC MASTER RACE computers. It is amazing to have so much room for whatever you want to do plus it is not built of flimsy stamped aluminum or steel. It has the feel of something that will be around 50 or 100 years. If you care how your rig looks this is the case for you. it gives you the tools to run wires out of sight and plenty of room to add anything your heart desires.

Cons: I didn't like how they made holes to mount a side GPU fan but no routing for the power that is required to make it work. I ended up just cutting a hole in the skin of the door and running it though the inside.
Also I am pretty sure this should come with a "GLORIOUS PC MASTER RACE" sticker for the outside, but maybe that is just me.
Also you have to be able to lift at least 50lbs to build this case. It actually has a "have 2 to lift" sticker on the box when you get it. I count this as a Pro but put it in the Con side for those smaller stature PC builders.

Other Thoughts: It looks amazing, the only problem is I now need to upgrade everything I have put into it to match the leetness of the case. Time for a Classified motherboard and time to upgrade from a 850W PS to a 1200.
Full water cooling to come soon thanks to all the extra room to make it look correct.

4 out of 4 people found this review helpful. Did you? Yes No

  • benjamin f.
  • 2/3/2015 7:52:49 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggscooler case

Pros: it is some easy to put thing in it.

Cons: wish the fans were more easy to replace with out loosing the speed and lights. but I like this case either way.

Other Thoughts: n/a

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

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