Corsair FRAME 4000X RS / Lian Li A3-mATX

Corsair FRAME 4000X RS: CC-9011302-WW · black · standard RS120 fans

Lian Li A3-mATX: A3-mATX steel case in black or white (A3-mATX BLACK / WHITE). The Wood Edition with a wooden front (A3-mATX-WD) and the Glass Edition with 3 mm tempered glass (A3-mATX-WDG) share the interior layout but differ in materials and dust filter arrangement; the later B4-mATX is a separate case.

SpecificationCorsair FRAME 4000X RSLian Li A3-mATX
Release year20262024
Announcement and availability7 April 2026; immediately available at announcement Corsair—
Case typeMid-tower; steel, tempered glass, plastic Corsair—
Motherboard supportMini-ITX, Micro-ATX, ATX; E-ATX up to 305 × 277 mm Corsair—
Back-connect motherboard supportSupported Corsair—
Graphics card clearance405 mm with 25 mm front fans; nominal 430 mm without front fans Corsair—
CPU cooler heightUp to 170 mm Corsair—
Power supplyATX; up to 220 mm long CorsairATX / SFX / SFX-L up to 220 mm; side or front mounting

The relocatable bracket lets the power supply move to suit graphics card length; an ATX unit can also be mounted at the front on the SSD bracket.

Lian Li
Included fans4 × RS120 PWM; unlit Corsair—
Front panelRGB Flow; 64 LEDs; 5 V ARGB Corsair—
Front I/O20 Gbit/s USB-C; 2 × 5 Gbit/s USB-A; combined headphone/microphone CorsairPower button, 2 × USB 3.0 Type-A, 1 × USB 3.1 Type-C, mic, HD audio Lian Li
ControlsPower button; no reset switch or drive activity LED Corsair—
Front/top fan railsFront fans up to 200 mm; top fans up to 140 mm Corsair—
Radiator mountsFront/top/side: 240, 280 or 360 mm; rear: 120 or 140 mm Corsair—
SATA drive bracket2 × 2.5-inch SSDs or 1 × 3.5-inch HDD Corsair—
Cable clearance37 mm behind the motherboard Corsair—
Dust filtersFront, side and bottom Corsair—
Vertical GPU mountingRotatable PCIe bracket; riser cable separate Corsair—
iCUE LINK lightingSeparate RGB adapter, compatible LINK hub and iCUE 5 required

Motherboard ARGB software is a separate control option.

Corsair		—
Case type and volume—MFF (Micro Form Factor); 26.3 L Lian Li
Dimensions—443 × 194 × 321.5 mm (D × W × H); 306 mm tall without feet Lian Li
Material—Steel; side and top panels in steel mesh

The Wood Edition has a wooden front panel, and the Glass Edition adds 3 mm tempered glass.

Lian Li
Motherboard—M-ATX and ITX; 4 expansion slots Lian Li
Graphics card—Up to 415 mm long, 4 slots thick

According to Lian Li, a 25 mm bottom fan limits card thickness to 61 mm (3 slots); a bottom radiator plus fan leaves no room for a graphics card. An anti-sag GPU bracket is included; vertical mounting needs a separately sold kit.

Lian Li
CPU cooler—Up to 165 mm tall Lian Li
Fan support—Top: 3 × 120 mm; side: 3 × 120 mm or 2 × 140 mm; bottom: 3 × 120 mm; rear: 1 × 120 mm

The case ships without fans; they must be bought separately.

Lian Li
Radiator support—Top: 360/240 mm; side: 360/280/240 mm; bottom: 240 mm (360 mm with fan at the bottom) Lian Li
Drive support—Tray: 2 × 2.5" SSD; bottom: 1 × 2.5" SSD or 1 × 3.5" HDD Lian Li
Dust filter and warranty—Removable bottom dust filter; 1-year warranty Lian Li