Skip to: | - A great place to buy computers, computer parts, electronics, software, accessories, and DVDs online. With great prices, fast shipping, and top-rated customer service - once you know, you Newegg.

If you are reading this message, Please click this link to reload this page.(Do not use your browser's "Refresh" button). Please email us if you're running the latest version of your browser and you still see this message. - Computer Parts, Laptops, Electronics, HDTVs, Digital Cameras and More!

Sign up today for a 30-day free trial of Newegg Premier
  • | Wish List
  • Help
Search all
Home > 
Computer Hardware > 
Computer Cases > 
Computer Cases > 
Cooler Master > 
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.
  • Pin It
  • Email this page
ICON Loading...

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

Do you own this product? Write a Review

ICON Loading...

Filter Results

  • 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.

Did you find this review helpful? 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.

Did you find this review helpful? 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!

Did you find this review helpful? 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

  • Matthew W.
  • 3/2/2014 1:39:56 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsBeautiful Case, Fans Kinda Loud

Pros: Saw this at my local brick-n-mortar store along with the Corsair 900D, fell in love with this one as it's much sexier to touch. Ordered from Newegg, and I'm pretty much satisfied. It's also lovely to build inside. Lots of space and numerous tie points make cable management a breeze.

Cons: Coming from an Antec Fusion Remote Max, the Cosmos II's stock fans are kinda loud, and they resonate obnoxiously when set at a lower speed using the built-in case fan controller (Especially the front 200mm fan.) In a home office environment, this is merely annoying. In a home theater environment, absolutely not cool.

Other Thoughts: All in all, the fans were the only disappointment, but people who buy this case will likely have the cash for better fans, and the rest of the case is superlative in ways that other cases costing even more than this one aren't, so it's still getting five stars. It's just that awesome.

Probably the last full ATX case I'll ever buy—not because it's bad (it's SO good), but because the non-professional and/or non-enthusiast just doesn't need anything larger than ITX or notebooks for most casual tasks. The Cosmos II, with its eleven 3.5" bays (plus two hotswaps) will make an excellent file server once I finally migrate to small form factor. This case just looks too good to be nothing but a NAS for the rest of its life.

Did you find this review helpful? Yes No

  • Tyler V.
  • 2/27/2014 11:04:58 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week

5 out of 5 eggsHuge Case!

Pros: VERY LARGE CASE!! It toke the FedEx person a dolly to get it unloaded off the truck. Very roomy, a lot of features!. I plan on water cooling with 2 rads( a 240mm and a 360mm)

Cons: A lot of plastic but it is a heavier duty plastic than on other cases.

Other Thoughts: Not worth $349.99...maybe $249.99 or even $299.99.

Did you find this review helpful? Yes No

  • Anonymous
  • 1/23/2014 2:17:45 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsBEAST

Pros: This thing is a BEAST. Love it cause I can fit my big hands in and mess with stuff. Seems like it is built to last. Both windows can swing out to expose the inside.

Cons: Super heavy, not the most mobile case haha

Did you find this review helpful? Yes No

  • Joy M.
  • 1/14/2014 1:26:12 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsBest Case I have ever worked with

Pros: Room for just about anything and everything, easiest case I have worked with despite how heavy its is. Cable management is the best I have seen in any case. Lots of options for fans, lots of space to work with components inside of the case. First time I have ever sat a motherboard in the tray and had it fit like a glove. Also the fan controller is probably my favorite part of the case. Really easy to work with.

Cons: Pretty heavy but you are warned of this so it is not worth taking an egg off. As others have stated this thing weighs close to 50 lbs without any components so make to be careful when lifting.

Other Thoughts: With all the slots for fans I would recommend getting lots of quiet fans even if they don't push a whole heck of a lot of air. The case get so much airflow from just the sheer amount of fans that you can get great airflow and have a whisper silent rig.

All in all I would buy another one of these if they occasion ever called for it.

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

Compare Offers from All Sellers

Seller Name & Rating Offer Details  
ICON Loading...

More Buying Options

Are you an E-Blast Insider? Subscribe Newegg e-Blast
Shop without retyping payment details. Secure shopping made faster.
Check out with PayPal.

Home > 
Computer Hardware > 
Computer Cases > 
Computer Cases > 
Cooler Master > 
Item#: N82E16811119252
Related Products
With its innovative styling and high quality construction, ...
Cooler Master N400 The N400 is a member ...
Cooler Master N200 The N200 is a member ...
Shop by Region: United States | Canada | China
VeriSign Click for the BBB Business Review of this Computers - Supplies & Parts in Whittier CAThis site protected by Trustwave's Trusted Commerce program Inc500
Policy & Agreement | Privacy Policy  © 2000-2014 Newegg Inc.  All rights reserved.
If the Adobe Reader does not appear when you click on a link for a PDF file, you can download Adobe Reader from the Adobe web site. nassau