Cooler Master COSMOS S Chassis

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The Cooler Master COSMOS S' interior also has a number of interesting features designed to ease the installation process, improve cooling performance, and reduce the case's acoustic profile.


The most notable internal feature is the COSMOS S' vast real estate.  This chassis can accommodate just about any graphics card / motherboard combination you can throw at it, with room to spare, eATX, ATX, CEB, whatever.  As you'll see a little later, we actually assembled an Intel Skulltrail rig in this case and the motherboard still has a few inches to spare between it and the drive bays.

The COSMOS S includes simple push button locking mechanisms for holding optical drives, or any other 5.25" device in place.  The PSU mounts at the bottom of the chassis, which can be a problem in some cases due to restricted air-flow and debris getting sucked into the PSU.  But with the COSMOS S, because the chassis is lifted off of the ground, and there is an adequate vent with a filter beneath the PSU mounting area, it works well and helps quiet down a system by putting the PSU fan as far away from the user as possible.


The case includes three 120mm internal case fans (front, rear, and top), but there are location for an additional three fans should you need to improve airflow within the system.  The side panel houses a massive 250mm intake fan that blows across the motherboard, and cools the entire system.  Also note the built-in liquid cooling accomodations on the rear, which consist of a pair of cut outs for tubing.

Another feature that also improves the COSMOS S' acoustic profile is its 4-in-3 hard drive mounting bracket.  The bracket takes up three of the external drive bays and an holds four hard drives - hence 4-in-3.  The cage is outfitted with rubber grommets that isolate the cage from the chassis to prevent unwanted hard drive vibrations.  We should also note that an intake fan blows air right across the hard drives, to keep them nice and cool.

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AjayD 6 years ago

Once again, another thoroughly excellent review by HotHardware. This case looks like a real beauty, not to mention the extensive cooling options. That side panel fan is a monster. I have been looking at various cases on newegg recently and this seems to offer the best combination of style, cooling, space and features of any I have seen.

By the way, I didn't know you had another Skulltrail lying around. When you gave away the last, I was thinking if it were me, I would have been a little more reluctant to let that baby go. I guess having another made it a little less painful to say goodbye. I would imagine giving away the Beast fits in somewhere right along with marrying off a daughter.

Anonymous 6 years ago

This is my new favorite case. If it is still around when I build a system next year this is the one i want. Unless of course I win the HH giveaway heh.

imAcpufan 6 years ago
I'm seriously thinking of getting this case. I'd like to get the clear side panel that cooler master has on their website, but I haven't seen it available anywhere yet.
ice91785 6 years ago

I am a little behind....I just read the article; I am just curious -- did the USB LEDs serve a good purpose? I mean was it a 'cool effect' or somehing that was actually useful....Also you mentioned that the drives didn't seem to be well fastened with the snap-plugs -- what if a rubber vibration absorber (don't know of a better term to use) was used...or is there just a lot of give/open space with the drive(s) in?

It is a really sexy-sleek looking case though.....for over $200 I will probably wait off on it however. I will admit that after reading the article I though "Wow I am going to go get one of these!!" and then I saw the price tag Sad 

amdcrankitup 6 years ago
AjayD 6 years ago

My favorite case of any I have seen is the Zalman Z Machine GT1000. I especially like the hard drive mounting system and the thickness of the aluminum used. The only downsides are the price and the lack of fans. Here is a wonderful review for anyone who missed it.

Zalman Z-Machine GT1000


I think I like the CM Stacker 830 Evo better than the Cosmos S after comparing the two. What do you guys think?

amdcrankitup 6 years ago

Another good looking case I think is this Thermaltake.

frg1 6 years ago

 like the titanuim and black finish

ice_73 6 years ago

 i actually prefer the tt armor case, but this is one heck of a case reminds me alot of the armor, but this one has better airflow. the bars on the bottom are logical since they help psu airflow, but what about the bars on top? do they have a reason or is it just for looks? 

higgamo 6 years ago

[quote user="ice_73"]

 i actually prefer the tt armor case, but this is one heck of a case reminds me alot of the armor, but this one has better airflow. the bars on the bottom are logical since they help psu airflow, but what about the bars on top? do they have a reason or is it just for looks? 


i think the top bars may be for adding an exterior water cooling, and for easy movement of the case. that the only thing i can think of. 

SqUiD267 6 years ago

 I didnt notic the front part of this case looked so nice. And touch sensitive keys? You guys sure do make a great review

rapid1 6 years ago

Very nice case I like this one and the 830 rs the best out of all cases. Great cooling and construction they seem to have taken anything into account one full tower system.

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