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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
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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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  • 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

Did you find this review helpful? 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.

1 out of 1 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.

3 out of 3 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

  • Keith S.
  • 1/13/2015 10:40:28 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsGreat. Better then pictures make it look.

Pros: Everything about this case is a pro. It is easy to use and cable manage the size is very nice to have and most of all none of the pictures do this thing justice. I took pictures and sent them to my father looking at them in 4k still lacks till you actually see it in person.

Cons: Only con is sheer weight however it is stated. I do not mind it. Really actual con is fingerprints on the doors. These are not worth an egg.

Other Thoughts: The case just by handling it for a day I can personally say will last a long time if taken care of its quality is superb.

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

  • EVA S.
  • 12/19/2014 12:56:28 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsMissing Parts

Pros: you kind of get what you pay for?

Cons: When I got the case there were somethings missing, Like panel with the two fans that are suppose to cool down the hard drives at the bottom of the case(it comes with two fans and they cool down the hard drives if any at the bottom of the case), also the case manual/instructions. I called newegg then they connected me with cooler master which then they told me to fill out a missing part form which I did about a as soon as I got off the phone with them. my request got approved, and its have been 4 weeks now and I still don't have my missing parts. very disappointing im not sure at whom new egg or cooler master.

Other Thoughts: I wish I'd received what I paid for!

Manufacturer Response:

Good Morning Valued Customer,

I apologize for the inconvenience as our standard Parts Request processing can take up to 7 business days for available parts, however some premium items such as those found in our Cosmos II may take longer as we appreciate your patience. Please contact us through our CM Fanzone at the links below to ensure your parts are fulfilled.

I look forward to your response.

Felinni M.
CMUSA Support

4 out of 6 people found this review helpful. Did you? Yes No

  • Anonymous
  • 12/3/2014 7:27:58 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsCosmosis

Pros: awesome case very roomie dident take long at all to swap everything out of my old case love the push buton fan control idea the fans that come with it are dead quiet even at 100%

Cons: the back door opens by its self after i did all my no see cable management and the fan controller. only supports 3 pin fans which makes the 2 120 mm fans i just bought useless

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

  • 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.

3 out of 4 people found this review helpful. Did you? 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

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

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Item#: N82E16811119252
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