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White micro-ATX server chassis with 90-degree rotated motherboard layout and 180mm fan

Silverstone Technology

Silverstone Technology Alta G1M Micro-ATX Server Chassis White

SKU CH-0WR9-K4KRZ

Micro-ATX server chassis with 90-degree motherboard layout, stack-effect cooling, 180mm fan, 360mm radiator support and 355mm GPU clearance

  • Chassis styleDesktop
  • 90-degree rotated motherboard layout creates stack-effect airflow
  • 360 mm radiator support enables high-capacity liquid cooling
  • 180 mm Air Penetrator fan drives vertical convection cooling
  • 355 mm graphics-card clearance fits triple-slot high-end GPUs
  • 159 mm tower-cooler height allowance accommodates large air coolers

Micro-ATX Server Chassis for High-End Builds

The SilverStone Alta G1M is a micro-ATX server chassis built for compact systems that still demand full-size performance. It suits enthusiasts and workstation users who need strong cooling and long GPU support in a reduced footprint. The 90-degree motherboard rotation creates a unique internal layout optimised for thermal efficiency. This design targets builders who want premium capabilities without a traditional tower profile.

Stack Effect Cooling and Clean Cable Routing

A mandatory cable routing system keeps all wiring hidden from view on four sides for a pristine interior appearance. The stack effect layout uses rising heat to drive airflow through the rotated motherboard plane. One included 180mm Air Penetrator fan reinforces this vertical flow path. The chassis supports a 360mm radiator or a tower cooler up to 159mm tall for CPU cooling flexibility.

Upgrade from Standard Micro-ATX Cases

This chassis replaces conventional micro-ATX enclosures that restrict GPU length or radiator size. It accommodates graphics cards up to 355mm long and triple-slot thickness, removing a common bottleneck for high-end cards. The jump is worth it when a build requires liquid cooling capacity and maximum card clearance in minimal desk depth. Builders needing multiple 3.5-inch drive bays or standard ATX board support should look elsewhere.

How it compares

Measured against everything we stock in Rackmount Server Cases, at today’s prices. Recalculated every night.

Price $209.99
Cheaper than about 54% of the 1,006 comparable items (median $222.49).

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Specifications

Size & build
Chassis styleDesktop

Questions about this item

What is the maximum graphics card length the Alta G1M supports?

The case accepts graphics cards up to 355 mm long, which covers most triple-slot models on the market.

How tall a CPU cooler can fit inside the Alta G1M?

Tower coolers up to 159 mm in height will clear the side panel and the 180 mm Air Penetrator fan.

How is the motherboard oriented during installation?

The board is rotated 90 degrees so the I/O shield faces upward, creating a stack-effect airflow path; remember to route all cables through the mandatory channels before securing the panel.

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