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Main image of 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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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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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
ADVANCED COOLING ARCHITECTURE
Includes dual pre-installed 200x38mm fans, supports up to 15 fans total, and radiators up to 420mm for high-performance systems
NEXT-GEN FRONT I/O
Equipped with 4 x USB-A 5Gbps ports and 2 x USB-C 20Gbps ports for ultra-fast data transfer and modern devices

Overview

Specs

Reviews (1)

Model
Brand	Cooler Master
Series	COSMOS ALPHA
Model	C700-KGNN-S00

Details
Type	ATX Full Tower
Color	Silver/Black
Case Material	Exterior: SGCC/Plastic/Aluminum Side Panel: Tempered Glass/Metal
Motherboard Compatibility	ATX / E-ATX / Micro ATX / Mini ITX/ EEB
Dust Filters	Yes

Expansion
Internal 3.5" Drive Bays	2
Internal 2.5" Drive Bays	2
Expansion Slots	8

Front Panel Ports
Front Ports	4 x USB 3.2 Gen 1 Type - A 5G 2 x USB 3.2 Gen 2 x 2 Type - C 20G 1 x 3.5mm Headset Jack (Audio + Mic)

Cooling System
Fan Options	Bottom - 2 x 140mm / Bottom - 2 x 180mm / Bottom - 2 x 200mm / Bottom - 3 x 120mm / Front - 2 x 200mm / Front - 3 x 120mm / Front - 3 x 140mm / Rear - 3 x 120mm / Side - 2 x 200mm / Side - 3 x 120mm / Side - 3 x 140mm / Top - 2 x 140mm / Top - 2 x 200mm / Top - 3 x 120mm
Radiator Options	Bottom - Up to 120mm / Bottom - Up to 140mm / Bottom - Up to 240mm / Bottom - Up to 280mm / Bottom - Up to 360mm / Side - Up to 120mm / Side - Up to 140mm / Side - Up to 240mm / Side - Up to 280mm / Side - Up to 360mm / Side - Up to 420mm / Top - Up to 120mm / Top - Up to 140mm / Top - Up to 240mm / Top - Up to 280mm / Top - Up to 360mm

Dimensions & Weight
Max GPU Length	400 mm
Max CPU Cooler Height	186 mm
Max PSU Length	240 mm
Dimensions	Incl. Protrusions: 669 x 330 x 639 mm

Additional Information
First Listed on Newegg	January 26, 2026

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Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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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

Learn more about the Cooler Master C700-KGNN-S00

Customer Reviews of the Cooler Master C700-KGNN-S00

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16811119476

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

Learn more about the Cooler Master C700-KGNN-S00

Customer Reviews of the Cooler Master C700-KGNN-S00

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info