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  • VIDEO
  • Cooler Master Cosmos Alpha Full Tower ATX PC Case – Flagship Curved Aluminum Frame, Powerful 200mm Dual Intake Fans, Fits 400mm GPUs & 420mm Radiators, ARGB Chassis Underglow, Limited Edition
  • Cosmos Alpha SilverCooler Master

Cooler Master Cosmos Alpha Full Tower ATX PC Case – Flagship Curved Aluminum Frame, Powerful 200mm Dual Intake Fans, Fits 400mm GPUs & 420mm Radiators, ARGB Chassis Underglow, Limited Edition

4.5 out of 5 stars (8)

$448.99
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About this item

  • FLAGSHIP COSMOS DESIGN Premium curved aluminum frame with full tempered glass panels preserves the iconic COSMOS look while integrated ARGB underglow elevates your build into a true showcase
  • EXTREME HARDWARE COMPATIBILITY Supports E-ATX and EEB motherboards, GPUs up to 400mm, and PSUs up to 240mm with 53mm rear cable clearance and removable dust filters
  • FREEFORM 2.0 ROTATABLE LAYOUT All internal components rotate left or right, allowing custom orientations for airflow optimization, desk placement, and visual presentation
  • MODULAR SLIDING MOTHERBOARD TRAY Easily switch between air and liquid cooling layouts. Adjust GPU distance to improve airflow or highlight your graphics card
  • NEXT-GEN FRONT I/O Equipped with 4× USB-A 5Gbps ports and 2× USB-C 20Gbps ports for ultra-fast data transfer and modern devices
Image

Product Description

he COSMOS ALPHA represents the evolution of a legendary flagship series—reborn under FreeForm 2.0 as the ultimate platform for PC enthusiasts and modders. Designed for builders who demand maximum flexibility, extreme cooling, and premium aesthetics, COSMOS ALPHA delivers uncompromised customization Product Sheet_COSMOS ALPHA_V1.5 Crafted with a curved aluminum frame and full tempered glass panels, it preserves the iconic COSMOS identity while integrated ARGB underglow lighting adds modern flair. With FreeForm 2.0, every internal component can rotate left or right, allowing you to design custom layouts based on airflow direction, desk orientation, or showcase preference. The modular sliding motherboard tray makes it easy to switch between air cooling and custom liquid cooling configurations while fine-tuning GPU placement. Built for flagship hardware, COSMOS ALPHA supports E-ATX and EEB motherboards, 400mm graphics cards, and 240mm power supplies. Cooling performance is unmatched thanks to dual pre-installed 200mm fans, support for up to 15 fans, and 420mm radiator compatibility—perfect for overclocking and custom loop builds. Front I/O includes dual USB-C 20Gbps ports and multiple USB-A ports, ensuring high-speed connectivity for modern peripherals. COSMOS ALPHA is not just a PC case—it is a halo chassis for builders who demand freedom, scale, and personalization without compromise.

Product information

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Cooler Master Cosmos Alpha Full Tower ATX PC Case – Flagship Curved Aluminum Frame, Powerful 200mm Dual Intake Fans, Fits 400mm GPUs & 420mm Radiators, ARGB Chassis Underglow, Limited Edition


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From the manufacturer

COSMOS Alpha
COSMOS Alpha
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

COSMOS ALPHA Case

Merchant Video
Crafted for Power and Style
Image

Comparison

Image

COSMOS ALPHA

Image

MasterFrame 600

Image

MasterFrame 500 Mesh

Dimension (L x W x H)/ Volume

669 x 330 x 639 mm / 88 L

Dimension (L x W x H)/ Volume

531 x 261 x 544 mm / 69 L

Dimension (L x W x H)/ Volume

471 x 261 x 544 mm / 60.9 L

Compatible Motherboard

Mini-ITX, Micro-ATX, ATX, E-ATX, EEB

Compatible Motherboard

Mini-ITX, Mini-DTX, Micro-ATX, ATX , E-ATX*, SSI-CEB* ​(*Conditional Support)

Compatible Motherboard

Mini-ITX, Mini-DTX, Micro-ATX, ATX , E-ATX*, SSI-CEB* ​(*Conditional Support)

CPU Cooler/GPU/PSU Clearance

186 / 400 / 240 mm

CPU Cooler/GPU/PSU Clearance

190 / 485 / 235 mm

CPU Cooler/GPU/PSU Clearance

190 / 390 / 235 mm

Color

Silver

Color

Black / Silver

Color

Black / Silver

LED Profiles

ARGB

LED Profiles

Non-LED

LED Profiles

Non-LED / ARGB

Top Brand: Cooler Master

Highly Rated
100K+ customers rate items from this brand highly
Trending
10K+ orders for this brand in past 3 months
Low Returns
Customers usually keep items from this brand

Brands in this category on Amazon

Customer reviews

4.5 out of 5 stars
8 global ratings
Best Case Ever Designed Beyond Any Doubt
5 out of 5 stars
Best Case Ever Designed Beyond Any Doubt
Absolutely stunning case. I've had 2 earlier models the C700P and the C700M I missed anniversary edition because it sold out so fast, I wasn't going to miss this one at all. This case is even MORE advanced than thte c700P. It allows you to hold up the video card with a dynamic shelf, the mother board can also slide, I used the slide above the case for the liquid cooling radiator that also slides!! There was even an extra fan to extract the heat behind the case for the cables.. the filters are all magnetic, the segregated powersupply area was more advanced than before and the dedicated metal covers for the cable management are top tier, this is a total upgrade! On the c700p the glass would also fall off, NOT this design, they have claps that are actually holding the glass door! WELL DONE!
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Top reviews from the United States

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  • 5 out of 5 stars
    The Last Case You'll Ever Need — A True Builder's Masterpiece
    Reviewed in the United States on February 25, 2026
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    I've built in a lot of cases over the years, but the Cooler Master Cosmos Alpha is on a completely different level. From the moment it arrived, it was clear this wasn't just a case — it's a platform built for people who are serious about their builds.

    The sliding motherboard tray is a game-changer. Reconfiguring between air and liquid cooling layouts used to mean hours of frustration. Now it's genuinely painless, and being able to fine-tune the GPU distance from the side panel is a thoughtful touch I didn't know I needed until I had it. Same goes for the adjustable fan bracket — sliding it closer to your hottest components to dial in airflow feels like something every case should have offered years ago.

    The thermal headroom here is absurd in the best way. The two pre-installed 200x38mm fans move serious air out of the box, and knowing I can scale all the way up to 15 fans and a 420mm radiator means I'll never outgrow this case no matter how extreme my next upgrade gets.

    Compatibility is another huge win. E-ATX/EEB motherboard support, room for GPUs up to 400mm, a 240mm PSU bay, and seven tool-free drive bays — this thing swallows a full enthusiast build without breaking a sweat.

    If you're an overclocker, a modder, or just someone who refuses to compromise, the Cosmos Alpha is the answer. It's the apex of what FreeForm 2.0 is all about, and it absolutely earns that title. Highly recommended.

    2 people found this helpful
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  • 5 out of 5 stars
    Best Case Ever Designed Beyond Any Doubt
    Reviewed in the United States on February 17, 2026
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Absolutely stunning case. I've had 2 earlier models the C700P and the C700M

    I missed anniversary edition because it sold out so fast, I wasn't going to miss this one at all.

    This case is even MORE advanced than thte c700P.

    It allows you to hold up the video card with a dynamic shelf, the mother board can also slide, I used the slide above the case for the liquid cooling radiator that also slides!! There was even an extra fan to extract the heat behind the case for the cables.. the filters are all magnetic, the segregated powersupply area was more advanced than before and the dedicated metal covers for the cable management are top tier, this is a total upgrade!

    On the c700p the glass would also fall off, NOT this design, they have claps that are actually holding the glass door! WELL DONE!

    Best Case Ever Designed Beyond Any Doubt
    Best Case Ever Designed Beyond Any Doubt
    Best Case Ever Designed Beyond Any Doubt
    Best Case Ever Designed Beyond Any Doubt
    Best Case Ever Designed Beyond Any Doubt
    Best Case Ever Designed Beyond Any Doubt
    Best Case Ever Designed Beyond Any Doubt
    Best Case Ever Designed Beyond Any Doubt
    5 out of 5 stars
    Best Case Ever Designed Beyond Any Doubt
    Reviewed in the United States on February 17, 2026

    Absolutely stunning case. I've had 2 earlier models the C700P and the C700M

    I missed anniversary edition because it sold out so fast, I wasn't going to miss this one at all.

    This case is even MORE advanced than thte c700P.

    It allows you to hold up the video card with a dynamic shelf, the mother board can also slide, I used the slide above the case for the liquid cooling radiator that also slides!! There was even an extra fan to extract the heat behind the case for the cables.. the filters are all magnetic, the segregated powersupply area was more advanced than before and the dedicated metal covers for the cable management are top tier, this is a total upgrade!

    On the c700p the glass would also fall off, NOT this design, they have claps that are actually holding the glass door! WELL DONE!

    2 people found this helpful
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    Thanks, we'll investigate in the next few days.
  • 4 out of 5 stars
    Beautifuly painful
    Reviewed in the United States on April 7, 2026
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    I'll keep this review short. This case is gorgeous, but boy, is it quite a pain to work with.

    The good-

    The case itself is gorgeous. Sure, the grilles are the only spots where there is plastic (which I don't mind), but overall, the build quality is very solid. This thing is also incredibly customizable, with the whole free from 2.0 gimmick, you have a lot of options on how you want the layout to be. The doors also have a very simple lift mechanism, making putting on and taking off the side doors really easy, especially during building and maintenance. The case is also super spacious, so be prepared to have big things inside, otherwise it will look very empty.

    The bad-

    This thing by itself is heavy, and depending on what parts you get, this build, fully loaded, can weigh up to 70+ pounds. Making it a workout to just move. I already knew it would be one, but it's something to keep in mind.

    Free Form 2.0, while a really nice gimmick, has its issues. On the sliding motherboard tray, even when tightened still had movement, so when plugging in cables or trying to put my GPU in the mobo tray, it would slide back instead of staying in place. Also, the tray never really slid the best, either, which made the struggle a little worse.

    I'll probably add on to this review as I continue to upgrade my build, but as first impressions go. It's a stunningly huge case, even better in person. But be prepared to put on some elbow grease, you'll be fighting this case a lot more than actually building.

    One person found this helpful
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  • 5 out of 5 stars
    The Cosmo Alpha Case is Future Proof.
    Reviewed in the United States on February 25, 2026
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    The Cosmo Alpha is the best case I have ever own. It looks great and the case quality is amazing! Money well spent!

    The Cosmo Alpha Case is Future Proof.
    5 out of 5 stars
    The Cosmo Alpha Case is Future Proof.
    Reviewed in the United States on February 25, 2026

    The Cosmo Alpha is the best case I have ever own. It looks great and the case quality is amazing! Money well spent!

    One person found this helpful
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  • 5 out of 5 stars
    Super recomendada es rápido y más barata
    Reviewed in the United States on February 25, 2026
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Muy bueno. Cumple con todo. Y super económica. Recomendado

    Super recomendada es rápido y más barata
    5 out of 5 stars
    Super recomendada es rápido y más barata
    Reviewed in the United States on February 25, 2026

    Muy bueno. Cumple con todo. Y super económica. Recomendado

    One person found this helpful
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    Translated from Spanish by Amazon
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  • 1 out of 5 stars
    Product looks great but amazon dropped the ball
    Reviewed in the United States on January 29, 2026
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Paid for next day shipping. Still hasn't been shipped. Said delivery Jan 29th. Now it say March 5th and on the item page it says get by Feb 7th.

    2 people found this helpful
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