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COOLER MASTER COSMOS S RC-1100-KKN1-GP Black Aluminum ATX Full Tower Computer Case

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Purchases from these Sellers are generally covered under our Newegg Marketplace Guarantee.
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  • Aluminum ATX Full Tower
  • USB2.0 x 4, IEEE 1394 x 1, Audio x 2, eSATA x 1 Front Ports
  • 7 External 5.25" Drive Bays
  • 4 (Hidden, converted from 3 x 5.25" drive bays) Internal 3.5" Drive Bays

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The Cooler Master Cosmos S is the latest PC chassis in the new Cosmos series of cases. Like its predecessor, it's designed for both function and style. The sleek design includes sturdy metal carrying handles at the top and bottom. There's a red-lit touch-sensitive power button at the top front for easy access. Behind it, a sliding access panel reveals four USB 2.0 ports, an IEEE 1394 port, microphone and audio output jacks and an eSATA port.

A simple release lever on the back allows both side panels to pop open for easy access. These side panels have a mesh design for superior ventilation. In addition, a huge 20cm fan built into the left panel draws in cooling air while 12cm fans located at the top and rear draw air into and out of the case. Up to three fans can be mounted inside the upper front of the case for additional air intake and a total of three more 12cm fans can be mounted at the top for exhaust.

Retaining holes in the rear of the case are ready to accept hoses for a liquid cooling kit and there is room for a 12cm radiator in the base and back of the case and a 3x12cm in the roof. Keep your system ice-cold without having to cut up the case! The case will support ATX and Extended ATX boards along with seven expansion cards. Seven front-accessible 5.25" drive bays and four hidden 3.5" drive bays give you plenty of configuration options.

  • newegg Aluminum Chassis With an aluminum alloy construction, the Cooler Master Cosmos S (RC-1100-KKN1-GP) reaches the balance between chassis stiffness and heat dissipation.
  • newegg Superior Expandability with 11 Drive Bays Boasting seven 5.25" external drive bays, and four 3.5" internal drive bays (converted from 3 x 5.25" drive bays), the Cooler Master Cosmos S (RC-1100-KKN1-GP) provides superior expandability.
  • newegg Peerless Cooling Performance The Cooler Master Cosmos S (RC-1100-KKN1-GP) features one huge 200mm fan on the side panel for maximum VGA cooling, and triple 120mm cooling fans on the top, in the front and at the rear to optimize internal airflow for peerless cooling performance.
  • newegg Tool-free Installation The tool-free design ensures quick installation and upgrade for expansion cards, 5.25" and 3.5" devices to save your time. Start enjoying computing rapidly!
  • newegg Easily Upgrade to Liquid Cooling The Cooler Master Cosmos S (RC-1100-KKN1-GP) features a spacious interior and rear retaining holes for easy installation of liquid cooling systems.
  • newegg Convenient Top I/O Panel The Cooler Master Cosmos S (RC-1100-KKN1-GP) features a convenient top I/O panel for easy access to one IEEE 1394, one eSATA, four USB 2.0 and two audio ports.

Learn more about the Cooler Master RC-1100-KKN1-GP

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by Newegg.com's Standard Return Policy.
Ownership: more than 1 year
Verified Owner
5/ 5
Great Case

Pros: Where does one start? It's big and beautiful it keeps your rig plenty cool. I kind of wish that Cooler Master would have kept this particular case in production. It holds the longest graphics cards-13.88 inches. Overall construction is great. The case is beautiful to look at. Very sexy.

Cons: None for me.

Other Thoughts: I had one of these back in '09. I really loved it. Unfortunately, it got damaged during a move. But alas! I found a brand new one in the box with all of the goodies about 2-3 years ago. I plan on doing a fresh build in it with water cooling. Great case. Better than the Antec 1200.

Did you find this review helpful?
5/ 5
Best Case Ever Made

Comments: Love this case 4 years later - building Ivy 3770K into this with GTX680 and Z77 board.... updating fans - adding lights- love this case - could be using it for 6 more years.....

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5/ 5
love it

Comments: All and all I am loving the case, Its HUGE and i will build my next computer in it if its still working perfectly!

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5/ 5

Comments: Bought this because a friend has had it for years and still loves it!!!

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5/ 5
Amazing Case

Comments: I have a Zalman 9700 CPU cooler and a XFX 6950 in this case and everything fits with tons of room around it and stays way cooler than my previous case. Its heavy, but the handles help you move the thing if you need to. I have one case fan on the bottom blowing in, one on the front blowing in, one on the back blowing out, one the side blowing in and two on the top blowing out and it keeps everything at below expected temperatures while over-clocking slightly. Overall this case is amazing and after you work through a few kinks you will love it too.

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3/ 5
Great Case

Comments: I bought this so I could accommodate my water cooling setup. Box arrived in perfect shape. I took everything out and the side panel fell apart. The nuts that were pressed into the side panel just popped all out. I called Newegg and asked for a replacement panel. I was promised a call-back to see if they had any. No one ever called me back.

so...
-1 egg for build quality
-1 egg for newegg not calling me back.

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3/ 5
Antec Twelve Hundred is Better

Comments: The reason I purchased this case is because it had a much more professional look than the Antec Twelve Hundred and it seemed more appropriate for an office environment. This case is the size of a mini fridge.

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5/ 5
Awesome

Comments: needs more room for cables in back.

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