InWin BL631 mATX Slim Desktop Case with 300W TFX PSU - Compact S.F.F

Our review of the InWin BL631 finds it best suited to users who need a truly compact Micro-ATX or Mini-ITX desktop that accepts standard desktop components while minimizing desk footprint. The single biggest reason to buy is its small 11.5L S.F.F. chassis combined with an included 300W TFX power supply, which gives a ready-to-build, space-saving system without having to hunt for a separate short PSU. It is a practical choice for a home theater PC, lightweight workstation, or compact office rig where footprint and noise control matter.

Key Features

• Ultra Small Form Factor: The 11.5L S.F.F. slim chassis keeps overall volume minimal for cramped desks or entertainment centers.
• Motherboard Compatibility: Supports Micro-ATX and Mini-ITX boards so users can choose common, full-featured motherboards instead of niche tiny-PC parts.
• New Partition Plate Cooling Technology (PPCT): The PPCT design with an adjustable air duct and enlarged vents improves airflow and helps keep noise down in a tight enclosure.
• Included Power Supply: The bundled 300W TFX PSU simplifies builds by supplying integrated power sized for compact desktop components.
• Drive and Bay Options: Multiple external and internal bays, including one 5.25' external bay and two internal 3.5' bays, provide room for optical drives, storage, and a detachable cage for easier installation.

Who It's For

This case is ideal for small office setups, media center PCs, or anyone assembling a compact Micro-ATX or Mini-ITX system that still wants to use standard desktop parts. The included 300W TFX PSU and the PPCT cooling make it a strong pick for quiet, space-conscious builds that do not require high-end discrete graphics or heavy overclocking.

Users who need a roomy interior for large graphics cards, multi-drive arrays, or high-wattage gaming systems should look elsewhere. Also, buyers wanting maximum expansion or multiple full-height cards will find the low-profile expansion and compact height limiting.

Pros & Cons

Pros

• Excellent build quality and value for money for a small Micro-ATX chassis.
• Compact 11.5L S.F.F. footprint ideal for tight spaces and media centers.
• Thoughtful cooling with second-generation PPCT and adjustable air duct improves thermal and acoustic performance.
• Comes with a 300W TFX PSU, simplifying the build process for many low-power systems.

Cons

• Limited internal height and low-profile expansion slots restrict large GPUs and extensive upgrades.
• Some users report the small size can feel too short for certain builds, requiring careful component selection.

Specifications

Case Type	11.5L S.F.F. Slim Chassis
Motherboard Type	Micro-ATX, Mini-ITX
External Bays	5.25' x 1, 3.5' x 1
Internal Bays	3.5' x 2, 2.5' x 1
Expansion Slots	4x Low Profile Slots
Power Supply	Included 300W TFX PSU

Our Verdict

The InWin BL631 is a well engineered compact case that offers strong value for anyone building a quiet, space-saving Micro-ATX or Mini-ITX desktop. With its second-generation PPCT cooling and an included 300W TFX PSU, it removes common small-case headaches, though buyers must accept limited expansion and carefully choose components to fit the tight interior.

Frequently Asked Questions

Does the case include a power supply?
Yes, it ships with a 300W TFX power supply included, which is suitable for typical low- to mid-power compact builds.

What motherboard sizes fit this case?
The BL631 supports Micro-ATX and Mini-ITX motherboards for flexible small-form-factor builds.

Can it accept full-size graphics cards?
The case uses low-profile expansion slots and a short interior, so full-size GPUs are generally not supported; choose low-profile or compact cards.