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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
  • USB 3.0 x 2, USB 2.0 x 4, E-SATA x 1, Audio In and Out 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
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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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

Quick Info


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

Customer Reviews of the Cooler Master RC-1200-KKN1

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  • William B.
  • 9/23/2014 7:01:01 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

4 out of 5 eggsHUGE CASE!! GREAT DESIGN

Pros: Its big!, Lots of room , enough space to adequately hold anything you can jam into it have plenty of room to breathe. Awesome design puts psu and hard drives in there own bays if you will, with separate cooling. Dust filters included here!

Cons: Shipping........looks like a forklift was driven through the side of the box and put a nickle size dent in the right side panel with 3 distinct scratch marks in the center of the dent. Haven't been able to contact Newegg yet as they were closed when I got home from work and could actually take a look at the case and make a phone call.. The other shipment I received from Newegg today was also lazily packed ( another review). My experience with Newegg has always been positive until this point. We will see what happens tomorrow I guess, its pretty sad there's just nothing to do but just sit here and stew until tomorrow.

Other Thoughts: At 57lbs empty, its heavy! So bet on a 90 - 100lb case when you add all your parts into it.

Did you find this review helpful? Yes No

  • William T.
  • 9/17/2014 6:33:28 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsMy dream case

Pros: unbelievable ungodly amount of space to build the pc of your dreams. quality and craftsmanship is awesome. really will be the last case you will ever have to buy!!! I have been building pc' s since 2000 and have at least 30 builds under my belt. never has a build gone so smoothly and so effortlessly with this case. Cooling options are to numerous to mention .. will fit all over sized coolers .. noctua, cryorig R! , and Cooler Master V8 GTS

Cons: didn't come with bunk beds installed .... they would almost fit!!!

Other Thoughts: asus z87 sabertooth
2 asus gtx 780ti in sli
I7 4790k
32 gig Gskill sniper series memory
evga super nova 1000w platnuim
CORSAIR Hydro Series H105

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

  • Stephen L.
  • 9/15/2014 3:00:06 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsUltra tower

Pros: An imposing monster of a case. Rest assured, anything in this monster will dominate whatever environment it shows up in. It has style and scale on a level no other case can touch. Anything can fit and everything is compatible with this enclosure.

Cons: It will make any setup you fill it with look small. It weighs nearly 50 pounds with nothing inside.

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

  • 9/15/2014 6:22:39 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsKiller Tower

Pros: Awesome choice to get this tower, of course if you are limited for space this is a bigger than average tower, you can fully load this tower with anything, and im sure it will keep it cool, i have in mine liquid cooled with front and rear fans as well as 2 upper fans and bottom fans, this tower also comes with fliter vents, all aluminum case painted black, well packaged and no scratches, or uneven color any where, many internal features as described, hinged side panels, a beauty and well thought out in my opinion

Cons: none

Other Thoughts: in the begining i thought it was pricey but in the past when i purchased other towers that were in the $150 range and i didnt know any better those were very flimsy junk towers compared to this one, this cooler master cosmos II is like a cadillac well built and solid so for the price i am not even about to complain ...............

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

  • William D.
  • 8/20/2014 11:35:09 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsGreat Newegg service - Horrible CM

Pros: Huge case with all kinds of mod potential. Adequate cable management, 98% steel and aluminum construction, tons of drive bays, Room for two large radiators for liquid cooling. Fast shipping and second to none customer service from Newegg!

Cons: Parts that are made of plastic are flimsy, horrible customer service from Coolermaster, bad design for placement of motherboards in case; too high, could really benefit from a pull out motherboard tray. Additionally, it would be great if this case was offered with a side window option.

Other Thoughts: I have purchased three of these cases since 2009, and bought this new design on the 17th of July. All three cases arrived with bad fan controllers. The fan controller and power module for the Cosmos II is a very cheaply made fan controller that will be sure to give you problems. If you decide to buy one of these cases, you need to plan on putting your own fan controller and some type of power and reset switch in to it. Be assured that the one that comes with it will most likely go bad on you if it doesn't arrive non-functional to start with. Additionally, though the case if heavy and appears to be well made, be very careful of the plastic parts on the case. They are very easy to break, especially the hot swap bay doors. When you do need a part, be prepared to wait months for it to be sent to you and to be placated when you call Coolermaster's customer support, with promises they will never keep.

Manufacturer Response:

Good Afternoon Deborah,

I apologize our Cosmos II case is not working correctly for you. If you're having any issues with parts on your recent purchase you can always contact us directly for a Parts Request and we will send you replacement parts immediately.

Please let me know for further questions.

Felinni M.
CMUSA Support

Did you find this review helpful? Yes No

  • George K.
  • 8/8/2014 11:55:42 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsGreat Case!

Pros: Extremely well built with lots of airflow, plenty of room for Water cooling, Easy access doors. It also has 5 fans with room to add 4-7 more depending on sizes.

Cons: The razor keypad finish had started to separate on the buttons but I was able to apply a little pressure and the problem disappeared.

Other Thoughts: When I ordered this case I knew it would be big but I was still shocked when I received it just how big it was. If you plan on water cooling this is definitely the case you want to have because of the room in it.

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

  • David G.
  • 8/5/2014 5:31:14 PM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsAmazing case... IF you need it.

Pros: This is an absolutely incredible case. It has almost everything you could want in one. Plenty of space for hard drives/SSDs, integrated fan controller, lots of space for cable management and excellent cooling. And it looks cool, tool.

Cons: This case is HUGE and HEAVY! DO NOT get this case unless you know you need one this big. If you get it just because it looks cool, you'll end up regretting your decision when you need to move your computer.

Other Thoughts: Fantastic case, IF you need it.

Did you find this review helpful? Yes No

  • Michael G.
  • 7/23/2014 1:10:35 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsLove this Case

Pros: -Freaking HUGE!

-Able to fit everything my Mobo can have and more.

-Great design for wire management.

-Fan controller on case

Cons: -very heavy (maybe a pro too)

-no window to show off build (very minor issue as I'm planning to buy a spare door to mod with a window)

Other Thoughts: This is a wonderful case, from the top 'roll'-bars down. The removable hinged doors are well designed, for ease of access during a build/upgrade. The cable management system is designed well also, so no wires get in the way of air movement. The fan controller works very well and frees up unnecessary Mobo wire clutter. The only thing I can suggest is to plan your build around not having to lift the case too many times, this thing is heavy pushing around 85 lbs. after everything was installed.

Did you find this review helpful? Yes No

  • Robert D.
  • 7/13/2014 12:48:18 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

3 out of 5 eggsGreat!!!

Pros: Everything -1 complaint...

Cons: The screws that come with this case are a joke... You would think for a 300 dollar case you could get better hardware... I've never seen such horrible mother board screws in my life... Corsiar at provides washers, screws that are not serrated on the back... This is a horrible horrible joke... I love the case but it only takes 9 screws to ruin the whole experience. Those screws if not careful and over tightended could easily damage a mother board...

Other Thoughts: VERY DISAPPOINTING COOLER MASTER... do a better job on the hardware screws you provide and be the product you claim to be. I'm very very very disappointed by this.

I gave this case 3 eggs although it's worth 5, but because the screws are so bad, so horrible that will be my rating. These screws are of low quality and not taking into account the components they are being attached to. I hope they do not cause any problems with my mother board. I should order some mother board mounting screws from corsair at least they are of good quality and does not make me worry about the damage they can cause because they are not serrated on the back side.

Customer dissapointed.

3 out of 5 people found this review helpful. Did you? Yes No

  • Anthony W.
  • 7/7/2014 11:00:27 AM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsFits Corsair AX1200i

Pros: Saw someone having an issue with Corsair AX series PSUs fitting properly. I used a Corsair AX1200i psu with no problems.

Cons: None

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

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Item#: N82E16811119252
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