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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
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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




ATX Super Tower
Case Material
With Power Supply
Power Supply Mounted
Motherboard Compatibility
Micro ATX / ATX / Extended ATX / XL-ATX / SSI CEB / SSI EEB
With Side Panel Window


External 5.25" Drive Bays
Internal 3.5" Drive Bays
13 (2 from X-dock, Middle cage for 5 HDDs, Bottom cage for 6 HDDs)
Internal 2.5" Drive Bays
11 (converted from 3.5" bay)
Expansion Slots

Front Ports

Front Ports
USB 3.0 x 2, USB 2.0 x 4, E-SATA x 1, Audio In and Out

Cooling System

80mm Fans
120mm Fans
Top: 120mm black fan x 1 (converted from 200mm fan x 1 / 140mm fan x 2 / 120mm fan x 3)
HDD: 120mm fan x 3 (2 for bottom HDD / 1 for Mid. HDDs)
Side: 120mm fan x 2 (optional)
140mm Fans
Rear: 140mm fan x 1
200mm Fans
Front: 200mm LED fan x 1 (converted from 120 / 140mm x 1)

Physical Spec

13.5" x 27.7" x 26.1" W x H x D
47.3 lbs.


Stylish and streamlined race-car inspired design

Brushed aluminum and steel for strength and elegance

Airflow optimized design

Supports up to 10 fans and 13 HDDs (2 from X-dock)

Supports 4 Way SLI/CF

Supports XL-ATX / SSI CEB / SSI EEB boards

Advanced Control Panel:

4 channel fan speed control

I/O (USB 3.0 x 2, USB 2.0 x 4, e-SATA, Fan LED on/off switch)

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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  • 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

Did you find this review helpful? Yes No

  • Anthony W.
  • 7/2/2014 2:39:33 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsOverall awesomeness

Pros: It’s big, I mean huge. It can hold more drives than you could possible use. It can fit any length graphics card(s) and still have room left. It can hold up to ATX-XL boards; my EXT-ATX looks small in it.
Really easy to build with this case; bigger cases make for easier builds in my opinion, and this thing is huge.
It’s metal. I love metal cases. This is mostly aluminum / steel and some plastic. I think metal looks better. It’s stronger, it’s tougher, and I believe the metal helps with thermal dissipation a little. This thing will last a lifetime. I won’t ever have to buy another case.
It has a great CPU cutout for upgrading your CPU cooler without having to remove your motherboard. I’ve seen others, but this one I would actually feel comfortable using.
Good cooling fan support. Good water cooling support. I can confirm that the top case can fit a corsair H-110 280mm radiator and fans provided you mount it with the case sandwiched between the radiator and fans (fans outside the case, radiator inside) The top fan cover accommodates the fans outside the case without problem. I love that the bottom rails elevate the case off of the floor for better ventilation.
The doors are on hinges and easily remove. If you are like me and frequently are inside your case updating/upgrading/adding things to your computer, this just makes things easier. I really am not a fan of the “insert door tabs into case slot and slide forward” thing. I always seem to have a bulk of cables on one side that tends to flex the door or worse I can’t get it to close at all. If there is stress on the doors the tabs bend. The tabs get bent through other mechanisms and don’t work well. I also don’t like constantly using screws to secure the doors, then having to unscrew them again. With this case, the doors are on hinges and you just shut them until it latches. To open, just press down on the lever and they are open. Super easy and quick, no tools required and no busted knuckles.
Build quality is excellent overall. I really think it’s quite attractive. Nice touches like the power supply mounting from the outside. I was able to set cable routing with the power supply slid out of the case slightly and it made making those connections much easier with the PSU out of the way. Disk drive fans on a hinged case with the wires routed at the hinge for a nice clean connection. It has easy-peasy cable routing. It’s really nice. I have 5 drives and two large graphics cards and it’s nice and clean. There is plenty of room to route on the other side of the motherboard. Doors have plenty of clearance, so even if you muck it up a bit the door closes no problem.
Built in fan and led controller if you are in to that kind of thing. Lots of leads from the fan controller for extra fans, lots of led leads (overkill really). Leads are generally well labeled.

Cons: Nothing huge, but a few little things would make this really great case even better.
Documentation is really poor. If I was someone doing my first build I would probably be on the phone a lot with support. I’ve had this complaint with all cooler master cases (3 total). I mean seriously, a couple of hours for someone to type up a more thorough manual would cost almost nothing.
The map for mounting the motherboard screws for the Extended ATX motherboard is wrong. Small issue, but if you follow the map (stamped to the inside of the case where the motherboard goes) you screw in 3 more mounting screws than you actually need and it forms an extra column of screws.
They have the motherboard mounts too high (my opinion) in the case. If they would lower it just an inch it would allow a radiator and fans to be mounted at the top inside the case. As it is now, it overlaps the motherboard and it won’t fit, even if you made it fit, it is blocking ATX power, and CPU fan connections. Fortunately you can run fans on top of the case and radiator inside (case sandwiched between), but there isn’t room for a push-me pull-you set up with two sets of fans. The case is big enough that there is plenty of room to lower the motherboard mounts if they chose. For me, this was the biggest issue with the case, and it’s not a huge one, and certainly not one that would prevent me from recommending this case.
The case is big, so cable length can become an issue. I had a serious challenge getting enough length out of the 8 pin ATX power cable from the PSU (very bottom of the case) to the motherboard header (very top of the case). I also was sweating other cable length issues, but I had no other problems.
It’s heavy. It’s heavy empty. It’s really heavy once you finish your build. Not an issue for me, but if you were someone who went to a lot of LAN parties, you would want to invest in a nice furniture dolly, or mount some heavy duty casters, and maybe get a body-builder friend, or a forklift to help you move it. Seriously, you don’t want to have to move this thing if you don’t have to. Like other choices, it’s a tradeoff. You want a big, well-made metal case with room for umpteen drives, four GPUs, a huge power supply and lots of water cooling? Then it’s going to be heavy.
There are holes in the door for mounting up to two 120mm fans. It would have been much nicer if they had been threaded to accommodate fan screws. As it is, they are just holes. In fact, why didn’t the case come with them already installed like the drive bay underneath? Already wired in the same slick way they set up the drive fans, with a quick-disconnect at the hinge area? Oh well.
The hot swap bays are tight, and it’s difficult to remove them. Plugging in an SSD would be a challenge; they are set up for full size HDD. It’s still a nice feature, but it would have been slick if it was made just a little bit better.
The internal drive bays have tool-less mounts that are ok. I wouldn’t call them cheap as

Other Thoughts: , but considering the price of the case and the build quality of the rest of the case, they don’t quite measure up. Also in my case they applied the “cooler master” sticker on one of the lock buttons upside down.
When you open the front drive bay slide cover to get to your external drives it blocks the front case fan.
Other thoughts
You might think from the length of my cons that I don’t like this case. Nothing could be further from the truth; I’m just giving full disclosure. I love this case; in fact it’s the best case I’ve ever had. It’s almost perfect. I absolutely recommend it to anyone who would ask.

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

  • Gary B.
  • 6/26/2014 6:04:05 PM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsBest Case Ever

Pros: This case has room for 13, 3.5" hard drives plus 3, 5.25" bays. Eleven of the drives are tool-less mountable or you have the option to add a screw on each side of the drives and 2 are slide in from the front. Be careful as some drives can bind as one reviewer broke his case. room for up to 11 fans, more if you get creative.
This is just a great case, buy it!

Cons: an extra inch above the motherboard would have been nice for thicker radiators or push fans and an extra inch in length for easy hose routing

Other Thoughts: I used every inch of this case with a 360 radiator on top, 13 hd's a dvd, usb panel, and a 140 rad mounted on the back of the case.

Did you find this review helpful? Yes No

  • Andrew L.
  • 5/25/2014 12:31:39 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsI love this case

Pros: Lots of Room
Easy to access everything
Built very nice.
Warranty Service was Great in my experience.
Keeps everything really cool.
Love the hard drive swaps and also all the hard drive slots. i Like how they give the option to remove hard drive slots for bigger radiator, i do not see my self getting another case for quite some time. Few cons that they should improve on.

Cons: Ok first one would be the oem fans that if you want to work with the fan controller you pretty much have to order from the manufacture and price for each fan is decent but shipping is crazy!!!

Now also i wish they would have some quick disconnects added to the fan wires so if your not using them you can disconnect them like close to the fan controller board in the back that way it looks a lot nicer in the back i have only 3 fans so far using there controller as i have not been able to purchase more yet but the amount of extra wires i have in the back really make it hard to put them in a place where it doesnt take much room.

Other Thoughts: I was having a issue after awhile with the i/o panel where if i inserted a usb it freeze my computer or if i walked just right by it and a piece of clothes touched it, it would freeze well i contacted them and they said the i/o panel needed replaced so they sent me off a new one which didnt have any instructions but it was quite easy to figure it out to replace it like 4 screws hold that in. This solved my problem. I didnt have to ship the old one back and they shipped the new one quite fast i had no problems and no delays in the whole process was quite pleased so i did not consider this a con because of everything went smooth unlike others they need to realize that not everything works perfect right off the bat there is some hiccups but if you find a company like this that backs their product you are golden and i dont know how you had any issues getting new pieces maybe the attitude you have towards the person you are speaking to maybe change that up.

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  • Justin G.
  • 4/8/2014 10:23:51 AM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsFINALLY !

Pros: On the 3rd attempt, I received an undamaged case. I love this case and can't wait to buy the rest of my build and assemble it. This case is a thing of gargantuan beauty. It's the hot amazonion of computer cases. Enough room for a huge build, and a kitchen sink (if you remove some of the drive bays).

Cons: UPS, do NOT get this shipped UPS, took them 3 tries to get me one that wasn't damaged. The packaging from Cooler Master is subpar. They have a rectangular piece of styrofoam at the top, and at the bottom of the case, there is NO PROTECTION should any pressure be placed on the box at mid case. If the carrier is careless with this product, you will get a damaged case.

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

  • Scott g.
  • 4/6/2014 4:40:45 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsGreat eggcept

Pros: Massive case anything you want will be in here tones of leads for extra fans basically this is a Higher Being of a case. i love how everything just fits perfectly in and the hardware you get included with the case is more than you would ever neeed. tons of thumb screwes.

Cons: I found a way to work around it however not to my liking. The power button does not work had to use the reset button/cable to my motherboard to be able to turn my computer on. I feel its a big enough flaw to take away 2 eggs. one for the flaw and 1 for a person to have the knowledge that it would work off another button. thumb screws yes even after you take them off with a screwdriver and hand tight back are a bit hard to do if you have large fingers but otherwise mostly a preference than a con

Did you find this review helpful? Yes No

  • Justin G.
  • 3/28/2014 4:05:46 PM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsCase looks amazing, UPS sucks.

Pros: The case is beautiful, and large enough for nearly any components you could ever need. I love the look of the case and have wanted it badly for a new build since the first time I saw it.

Cons: UPS shipping SUCKS !!! I received the first case with visible damage to the box front. I opened it to find the plastic trim that goes all the way around the side panel had a several inch chip out of it on the front by the fan intake. RMA was quick and easy, 2nd case arrived and it's damaged worse than the first one was, visible box damage, that same trim broken at the back of the case up and to the left of the power supply opening. Seriously UPS? You can't treat your customer's packages with respect? (<- Not a d*ck joke)

Other Thoughts: If you order this case, or possibly any others, use a carrier other than UPS, for the sake of your own sanity and to save yourself an RMA, or two. 3rd case is on the way after they get this one back, and NOT via UPS.

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

  • Roberto G.
  • 3/24/2014 5:05:29 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsHEAVY!

Pros: Air flow is no concern with this case!! And neither is hdd space. I put a full atx in here and still have room for a liquid cooled system, hopefully in the near future!

Cons: No Window :( I just keep my side panel off for the meantime. Very Heavy, but sturdy!

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

  • Johnathon D.
  • 3/14/2014 7:28:30 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsCosmos II Ultra

Pros: So far i love this case, i spent 2 weeks looking at cases in store and online before i made a purchase. While the price was a tad steap, it was well worth it i think. This case is a tank, 56lbs empty but suprisingly easy to carry with the rails on the top and bottom. I love the fuctionality of this case as well, lots of drive bays, 2 SATA drive bays for hot-swaping drives, good amount of stock fans that are easy to remove if needed. I also purchased a corsair H100i water kit and it mounts perfectly to the top fan plate, had to remove stock fan before doing so but still very easy.

Cons: Heavy and Lots of cables. the Price isnt that hot either.

Other Thoughts: Get it!

Did you find this review helpful? Yes No

  • Bryan B.
  • 3/2/2014 11:30:03 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsGood Case

Pros: Case is huge with a lot of space for drives and/or liquid cooling units.

Cons: Poor labeling on internal wires. There is a jumble of wiring that leads to different areas of the case. Most of it looks to be fan leads, however no proof as the fans all came on with the main power added.

Other Thoughts: I had to take an egg away because the locking doors for removable hard drives broke on mine. They were smart enough to put a metal leaver for pushing the drive out, but not at the pivot point for the door. My door snapped off while trying to remove a drive. By snapped I mean broke in a way that cannot be fixed.

Did you find this review helpful? Yes No

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Item#: N82E16811119252
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