The Cooler Master Cosmos Alpha Full Tower Case (C700-KGNN-S00) features a flagship FreeForm 2.0 modular design with a sliding motherboard tray and adjustable fan brackets for flexible airflow and custom layouts. It supports Mini-ITX through E-ATX and EEB motherboards, room for GPUs up to 400mm, and up to 15 fans or large radiators to 420mm for serious cooling configurations. The case has tempered glass panels, extensive fan/radiator support, removable dust filters and a roomy interior with USB-C and multiple USB-A front I/O for modern connectivity. Its full-tower build volume and modular internals make it ideal for enthusiast gaming, water-cooling and custom showcase systems.
VIDEO
Features
COSMOS ALPHA
Cosmos Always Leading
COSMOS series, hailed as the ultimate expression of PC case modularity, evolves into the “halo” platform for enthusiasts and modders. With its iconic design language and enhanced modular internals, COSMOS is engineered for boundary-pushers who want limitless control over layout, cooling, and customisation.
Brand new COSMOS ALPHA will serve as the aspirational apex of what FreeForm 2.0 stands for — freedom, scale, and personalisation without compromise, making it an ALPHA case for all ALPHA builders.
Sliding Motherboard Tray
Sliding tray design to free up the space inside the case and enable seamless system reconfiguration between air and liquid cooling layouts. Builders can also fine-tune the distance between GPU and side panels with ease – whether to optimise airflow or highlight GPU upfront.
Sliding Adjustable Fan Bracket
Adjustable to accommodate case fans in different sizes, and the sliding design allow users to easily move the fans closer to heat spots for better airflow to cool down the system.
Optimised Thermal Architecture
Pre-installed dual extra-thick 200x38mm fans. Accommodate 15 fans at most and support radiator size up to 420mm to ensure ultra-high airflow and versatile cooling flexibility for any build.
Maximised Compatibility & Space
Support E-ATX/EEB motherboards, 400mm GPUs, and 240mm PSUs. Tool-free bays support up to 7 drives for effortless expansion. Provide builders with uncompromised platform for wide-open FreeForm creation.
Fans Support
Radiator Support
I/O Ports
Specifications
Model Number
C700-KGNN-S00
Product Name
COSMOS ALPHA
Series
COSMOS Series
Colour(s)
Black / Silver
Materials - Exterior
SGCC / Plastic
Materials - Side Panel (Left / Right)
Tempered Glass / Metal
Dimensions (L x W x H)
669 x 330 x 639 mm (Incl. Protrusions), 579 x 260 x 582 mm (Excl. Protrusions)
Volume
88 L (no panel / protrusions / feet)
Motherboard Support
Mini-ITX / Micro-ATX / ATX / E-ATX / EEB
Power Supply Support
ATX
PCI Expansion Slots
8
Drive Bay Support - 5.25" Drive Bays
0
Drive Bay Support - 2.5" / 3.5" Drive Bays (or SSD)
2 or 2 (CPU Cooler under 165 mm)
Pre-Installed Drive Bays - 5.25" Drive Bay
0
Pre-Installed Drive Bays - 2.5" / 3.5" Drive Bays (or SSD)
2 or 2 (CPU Cooler under 165 mm)
I/O Panel - USB Ports
4x USB 3.2 Gen 1 Type-A 5G, 2x USB 3.2 Gen 2x2 Type-C 20G
I/O Panel - Audio In / Out
1x 3.5mm Headset Jack (Audio+Mic)
Pre-Installed Fan (Fan dim./ Fan speed/ LED colour/ Fan Connector ) - Front
2x 200x38 mm (Non-ARGB)
Pre-Installed Fan (Fan dim./ Fan speed/ LED colour/ Fan Connector ) - Rear
1x Mobius 120x25 mm (Non-ARGB)
Fan Support - Front
3x 120mm / 3x 140mm / 2x 200mm
Fan Support - Top
3x 120mm / 2x 140mm / 2x 180mm / 2x 200mm
Fan Support - Rear
3x 120mm
Fan Support - Bottom
3x 120mm / 2x 140mm / 2x 180mm / 2x 200mm
Fan Support - Side Mount
3x 120mm / 3x 140mm / 2x 180mm / 2x 200mm
Radiator Support - Top
120 / 140 / 240 / 280 / 360 mm (maximum thickness clearance 93mm)
Radiator Support - Bottom
120 / 140 / 240 / 280 / 360 mm (maximum thickness clearance 93mm)
Radiator Support - Side Mount
120 / 140 / 240 / 280 / 360 / 420 / 3x360 mm (maximum thickness clearance 80mm)
Dust Filters
Yes, Removable Filters
Clearances - CPU Cooler
186 mm
Clearances - Power Supply
240 mm
Clearances - Graphics Card
400 mm
Cable Routing - Behind Motherboard Tray
53 mm
What's Included
VGA card holder
Warranty
2 years
Size
Full Tower
Backed by a 2 year Cooler Master warranty.
