L400 Mini-ITX PC Case - Ultra-Compact Vertical SFF Chassis

In this review of the L400 Mini-ITX PC Case, the bottom line is simple: it is for users who need a true desktop-grade GPU in a pocketable, vertical small-form-factor chassis. The reviewer found the L400 delivers on its promise of a compact 12.1L footprint while still accommodating triple-slot GPUs up to 13.78' (350mm), making it a rare option for gamers and creators who want powerful graphics without a full tower. Build quality, cooling orientation, and the included PCIe 4.0 riser and DP 1.4 cable are the most compelling reasons to consider this case.

Key Features

• Ultra-compact vertical design: A 12.1L chassis (198 x 169 x 363mm) saves desk space while housing large triple-slot GPUs up to 350mm.
• Advanced mesh cooling system: Full-perforation steel mesh panels support up to three 140x15mm ultra-slim fans for strong side-to-top airflow and better sustained GPU cooling.
• GPU-ready plug-and-play: The included dual reverse PCIe 4.0 riser and 1.5m DisplayPort 1.4 extension simplify installation and preserve signal quality for high-refresh displays.
• Lightweight, rugged frame: High-density steel construction with reinforced corners and anti-vibration feet keeps the chassis stable while remaining portable at about 5.5lbs.
• Flexible I/O and power support: Front Type-C and USB 3.0 ports plus compatibility with ATX, SFX, and SFX-L PSUs give room for varied builds and peripherals.
• Portable convenience: Side-mounted steel handle and compact weight make this case easy to carry to LAN events or between workspaces.

Who It's For

The L400 is best for gamers, content creators, and professionals who want a full-length, triple-slot GPU in a space-saving vertical SFF chassis without giving up desktop-grade performance. It suits anyone who values portability and a simple, plug-and-play GPU installation flow for high-refresh monitors.

Users who need multiple 3.5' drives, large air-cooled tower CPUs, or extensive internal expansion should look elsewhere, since the L400 focuses on compactness, two 2.5' drive mounts, and mini-ITX motherboards rather than traditional full-size expandability.

Pros & Cons

Pros

• Accommodates long triple-slot GPUs up to 350mm while retaining a very small 12.1L footprint.
• Includes a PCIe 4.0 riser and DP 1.4 cable for easy setup and reliable display output at high refresh rates.
• Steel mesh panels and support for three ultra-slim 140mm fans promote effective side-to-top airflow and dust mitigation.
• Lightweight frame with a carry handle makes the chassis genuinely portable for LANs or travel.

Cons

• Requires careful component selection for cooling and PSU length in the limited internal space.
• Fans are sold separately, so optimal cooling requires buying additional slim 140mm fans.

Specifications

External dimensions	198 x 169 x 363mm (7.8' x 6.65' x 14.41')
Volume	12.1L
GPU support	Triple-slot GPUs up to 350mm (13.78')
Cooling	Supports up to 3 x 140x15mm ultra-slim fans; full-perforation steel mesh panels
PSU compatibility	ATX, SFX, SFX-L supported
Included accessories	PCIe 4.0 riser cable, DP 1.4 1.5m cable, steel handle, manual
Weight	Approximately 2.5kg (5.5lbs)

Our Verdict

The L400 Mini-ITX case is a well-executed compact chassis for builders who need a long, triple-slot GPU and portable design without sacrificing airflow or cable flexibility. With the included riser and DP cable and support for ATX-class PSUs, it represents strong value for gamers and creators who prioritize a compact desk presence and straightforward GPU installation.

Frequently Asked Questions

Can it fit full-length triple-slot GPUs?
Yes. The case supports triple-slot GPUs up to 350mm (13.78') in length.

Are fans included?
No. The chassis supports up to three 140x15mm ultra-slim fans, which are sold separately.

Which PSUs are compatible?
The L400 accepts ATX, SFX, and SFX-L power supplies; check PSU length against your GPU choice before buying.