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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" Drive Bays

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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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Pros: Ah The Cosmos II, This Super Tower Is a Piece of ART but Built like a Tank.
There is space in this Super Tower for EVERYTHING you need to build in it.
I smile every day just looking at MY Cosmos II!! Knew I would, which is one of the reasons for spending $316 to get one.
I've had clients give me credit in my ability to repair their computers just because they saw my Cosmos II. All who see it are impressed.
This Tower is hard core, bdass and very smart.
If you have the means to acquire one, DO IT!
I have NO regrets buying this case. I love it.

Cons: Absolutely NO cons period

Other Thoughts: Absolutely will and have recommended this work of Tech Art to EVERYONE!

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  • Anonymous
  • 1/16/2016 5:37:03 PM


Pros: The best grade gaming case Lots of hard drive bays and a ton of room for motherboard and what ever cooling system you want to install its got the room for it. its thick enough to install fan cooling system on your graphic card and still close the door.
it even comes with two car doors with laches. its not some sheet metal with funny things to lock in and no need for door scews that is hard to use.. its simple Open, Close , Open, Close. able to hide wires. dose not look cheap. Dose not look like it comes out of China worst nightmare.. you can upgrade your case with internal lights if you like and the door can be removed. and you can install custom clear door for lights if you are a fan of RGB lighting if you want your motherboard light up like Las Vegas its got the room for it.. its heavy weight will make it harder for people to break in people homes and rob it. its all ready empty 50 pounds fully loaded. it can end up being a Hundred pounds or more.. best power supply bay lots of room its got even a floor that covered the power supply to keep power supply heat getting in to the motherboard.

Cons: I do recommend this case 100% however if you cannot lift heavy. I think they should have think about this,. use stronger and lighter metals. Safety on back breaking lifting 100 pounds fully loaded. its nice to be made like a tank.! 50 pounds empty fully loaded 100 pounds. and add a 2nd door in the package with a clear window for lights.

Other Thoughts: needs a 2nd back up door with window for lights
use lighter and stronger metals to cut down the back breaking weight 50 pounds too heavy
put some red trimmings on the hard drive bays. its easy to do. I take off the mesh off the hard drive try paint it flat white then the brightest red and install it. easy fix.
lots of room to expend
lots of space for cooling
floor above the power supply to keep the heat coming out of the power supply on to the motherboard
lots of power supply space
Nice black design however could use some Semi Gloss

I was unable to enjoy this case well its not Cooler Master's fault. that's due to ASUS, ASROCK, MSI, GIGABYTE that cannot make a working motherboard ! keep way from ASUS. no repair no service and $130.00 dumping fee from a credit card collection. X99 worst CPU socket.. I have to put in something later

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  • Joseph L.
  • 1/12/2016 5:56:55 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsFantastic case

Pros: Plenty of space for any build
Well built, very sleek design
Extremely water cooling friendly
Plenty of places to mount fans, rads and just about any add ons
Comes stock with 4 fans (although the blue one I wont use because it wont fit my build)

Cons: Looks massive (but then again thats what you get when you order an ultra tower case)
Unfortunately there are no windows. All parts are hidden (some people may like this but not me) but obviously i knew this before purchasing. (there are windows or full acrylic aftermarket panels you can purchase if, like me, you want this look for your pc)
Very pricy for a full case

Other Thoughts: Came in the mail damaged. I doubt this was the manufacturer's or newegg's fault (probably occurred during shipping because the box came so beat up), but regardless i couldn't be happier with newegg's customer service. They promptly hooked me up with a return label and even next-day shipping on the replacement.

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  • Anonymous
  • 1/9/2016 9:56:28 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsBest case i have ever owned !

Pros: This is so far the best case I have ever owned , I have being building computers for about 15 years now and I have already come across so many types of computer cases and this is so far just unbelievable in build quality , it's a very very sturdy case , you won't be disappointed with it , plus if you are going with hard tubbing water cooling there is a lot of space to be used for your benefit . The case is a lot bigger then I looks on the picture be aware of that.

Cons: I don't see any , the only thing I see in this case is that you really need a lot of space to accommodate the case which is expected.

Other Thoughts: Never using Purgulator for any kind of shipping again.

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  • Gerard I.
  • 1/4/2016 8:49:23 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsBest case I ever build in

Pros: This may be a long review.

-First question someone may ask when looking at the case is, how does something this expensive hold up in 2016? Well I will have to say Cooler Master made one amazing case. Even today the Cosmos is one of the easiest chaises to work in, 7 grommet cable management holes on the right hand side for maximum management. The back 'door' of the Cosmos leaves a lot of room for cable management as well.

But what about water cooling then?
-admittedly this case was made when AIO water cooling unites and even DIY water cooling was in a very small corner of the PC market. The Cosmos II offers good water cooling solutions, can fit up to a 360mm radiator at the top with a thickness of 30-40mm depending on heatsink of motherboard. That means you will most likely not have this in push-pull configuration. I have my AIO 280mm Nepton with the fans on the top of the Rad not the bottom. The accessories also includes a bracket to mount a 240mm rad in the basement of the Cosmos. If you get another bracket set then you could mount two 240mm rads at the bottom. reservoir and Pump combo may be mounted on the side of the harddrive cages or if you take the cages out there are holes to mount the reservoir with the correct mounting mechanism. But with enough determination you can do what you need to with this case. If anything this shows how unique the Cosmos II is and how versatile it truly is. A lot of cheaper cases today are one trick ponies, they are either meant for water cooling, air cooling, noise dampening, or easy cable management. While thats great we have cases like that for the average user to just "plug and play" a case. Its nice to work in a case you may have to work with a little bit to express your creativity in. But I digress.

How about the looks? there is not clear side panel!!??
-while thats true there is no stock clear side panel, there is one option out there. Mnpctech offers a Cosmos II clear acrylic side panel, that I in fact ordered myself. It is pricey at $160, now I dont expect a lot of people to buy this side panel, but it does look amazing and makes the Cosmos II look even better. But the stock panel that the Cosmos II has is also really well built and nice. The few mesh honey comb holes show off some lighting effects if you have any in the case.

Finally, this case is so BIG. So much space inside I have two 90ti Strix cards which are about over 12in, and after you take the drive cages out the top the case still makes the GPU set up look small. Which means lots of room for cooling. Have a 200mm fan blowing fresh air on both GPU's at all time in addition to such a free flowing case. No heating problems what so ever.

The case has been updated from when it was first released. All of the cords/front header connectors have been sleeved black and CM added E-ATX hole pattern when installing a E-ATX MOBO.

This is absolutely a one of a kind case.

Cons: One con, I wish CM would make a more affordable clear side panel. I think that fact stops a lot of people from buying this case.

Other Thoughts: Do more research on the Cosmos II, overclokers forum is really nice and supportive in answering questions about this case, the community is still active and nice.

My PC Specs:
Case: Cosmos II
Motherboard: MSI X99A gaming 7
Processor: i7-5820K
GPU: GTX 980TI 2-waySLI
PSU: 1000w EVGA SuperNova G2
Cooler: CM Nepton 280mm
Boot drive: Kingston hyperX 240GB
Steam drive: 512GB Samsung 850 Pro, 1TB Samsung 850 Pro
Media storage: 9TB WD NAS
Lighting: Hue+

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  • Garrett S.
  • 12/30/2015 11:02:40 AM

5 out of 5 eggsExpensive but worth the cost!

Pros: -The great style
-easy to build in due to the large size
-VERY roomy with support for any size MOBO and any size or amount of graphics cards or expansion cards
-Integrated zoned fan control (was one of the selling points for me)
- Extereme amount of watercooling support
-The separate compartments on top and bottom so I can put my hard drives on the bottom and leave the front of the top unobstructed
- Removable fan filters EVERYWHERE
-Lots of room and grommets for cable management below and behind
-Space for LOTS of fans. It can fit up to 10 although I have 9. ( 1 140mm in the back, 1 200mm and 1 120m on top, 4 120mm of the side (2 for the gpu and 2 for HDD on the bottom), 1 120mm inside on the harddrive cage up top and 1 200mm on the front.

Cons: -The style looks great and although it may not have worked with the style or shape of the case it would be nice to have the option to have a glass portion on the side panel to see inside.
-Most may not be able to afford it

Other Thoughts: If you can justify the price to yourself and you dont mind that you cant see inside with the side panel closed. This case offers so much expandability it will last you many an upgrade and will work for many years to come.

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  • Nathan F.
  • 12/27/2015 10:32:21 PM

5 out of 5 eggsA truly remarkable case!!!

Pros: If you are on the fence about making this purchase, do not hesitate. The amount of work and thought put into this design is unmatched. Never have I seen a case (or product of any kind) with so much attention to detail. I have 12 builds under my belt now, mostly for friends of mine, and this is by far, the most incredible case I have ever worked with. After removing the Cosmos II from its box, you will find yourself going over it for hours with your eyes and hands and seeing all the detail that has went into this piece of art. I am completely beside myself, and cannot wipe this smile from my face. The sheer size of this case is mind boggling! All of the intake/exhaust ports have very high quality dust filters installed and are easily accessible. The hinges on the doors, and sliding mechanisms for the top switches and front drive bays are incredibly durable as are the drive mounts. Everything is finished very nicely, and will easily outlast any of the components housed inside. The PSU mount also has rubber contact points to eliminate vibrations. There is more than enough space inside for any type of setup you are planning to build. The razor styled buttons are also a very nice touch. All in all, the case is fairly expensive. But well worth the cash, as it is built like a tank and will bring a smile to your face each time you look at it.

Cons: The only thing negative to say about this case is that it may require the purchase of a new desk to sit on as it is a monster! Not really a negative though.

Other Thoughts: I wish the case would come with more than just the one lighted fan (200mm front). I also cannot seem to find a single cup holder on it anywhere...

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  • Matthieu C.
  • 10/22/2015 1:01:56 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsCooler Master Cosmos II

Pros: Coolest tower ive ever seen
very good airflow,
plenty of space to do the wiring
well placed holes
Customisable HDD bay
plenty of space to install radiator and additional fan

Cons: cannot fit a 140XL of cooler master inside properly, the only way i found is to install it sideway, so my graphic card have enough clearance, but the door no longer close

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  • Samuel A.
  • 10/20/2015 8:05:18 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggs

Pros: - Very nice looking.
- Big enough for a Noctua NH-D14 SE2011 CPU cooler. The side panel closes with plenty of free space left. I had trouble closing the side panel with that CPU cooler in another case.
- The wire holes on the back and bottom make for an easy and clean looking build. It also makes it very easy to remove and add HDDs.
- The included stand-off socket makes it easy to screw the stand-off tight without having to use pliers.
- The bottom HDD trays are removable rapidly. I had to remove one temporarily to mount the front bottom fan.
- The top hand rails make the case easier to move around than a case without them.
- The side panels are easy to remove and put back on.
- The manual is good enough. I used it to figure out how to remove the front and top grills to install case fans, how to remove the HDD tray, how to install a fan in the door.
- Plenty of room between HDDs for airflow.
- There are holes on the 5 1/4 drive bays on the back side if you want to use them. I had to use them instead of the tool-free lock on a 6 x 2.5 inch drive 5 1/4 HDD rack.

Cons: - The HDD trays are made of soft plastic and look fragile. Not really a con since they are sturdy enough if you handle them normally. I mounted many HDDs and did not have any issues with them.
- There could be slightly more room on the back side. Closing the door was a tight fit with all the wires rooted there.
- On the fan controller, the fan icons are lighted but the writing is not. Makes it harder to use in low light. Not really an issue for me as I don't change the fan speed often.
- There was a sticker on the top rear part of the case warning not to lift the case by a plastic part. The warning is a good idea but the sticker was a bit hard to remove cleanly as it was a paper glued sticker on plastic. It ripped and left a bit of glue residue. There was also a warning on the top front part of the case and it was on a plastic sticker that was very easy to remove without leaving any glue residue. They should use the same type of sticker for the rear sticker. Nothing major really, I got the sticker off and the glue cleaned up in a few minutes.

Other Thoughts: The case is higher than my computer desk so don't expect to put it under a desk.

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  • Michael B.
  • 10/16/2015 2:31:00 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsHeavy case, high quality

Pros: The case itself is pretty sturdy and has plenty of openings for cord routing. The fan controls at the top add in a nice touch as it allows you to speed up and slow down the fans and turn on the LED lights. If you have a water cooler for the CPU like the H100i from corsair you can place the top fan partially under the fan controller and install the water cooling fan system using just 2 screws for extra cooling. It also fits my 2 GTX 980ti graphics cards without having to squeeze them in.

Cons: It is heavy, but to be honest that is to be expected when you buy a large case.

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Item#: N82E16811119252
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