This article covers アユート inwin ビジネスにも最適なスリムタイプ micro-ATX タワーケース [ IW-BL634B.
Overview
The Inwin IW-BL634B/300B2 is a slim micro-ATX tower case designed for business and office environments. It features a sturdy SECC steel chassis and comes with a built-in 80 PLUS Bronze 300W power supply, making it a cost-effective all-in-one solution for compact builds. The all-black, understated design blends seamlessly into professional settings like offices, reception desks, or retail POS systems. Key specifications include support for Micro-ATX and Mini-ITX motherboards, four Low Profile PCI expansion slots, and front-panel I/O with two USB 3.0 ports, two USB 2.0 ports, and audio jacks. Maximum CPU cooler height is 70mm, and the maximum graphics card length is about 200mm — enough for low-profile or entry-level GPUs. The case targets the entry-to-mid-range market, offering a complete package (case + PSU) at a very competitive price. It is ideal for basic office PCs, thin-client workstations, or low-power servers.
Compatibility Guide
Motherboard compatibility is limited to Micro-ATX and Mini-ITX form factors. ATX boards will not fit. The power supply is fixed at 300W and is not user-replaceable in this model, so future upgrades to higher-wattage components are impossible without replacing the entire case. Expansion cards must use Low Profile brackets (often called half-height) and measure no longer than 200mm. For a graphics card, choose a model with TDP under 75W and without auxiliary power connectors (e.g., GeForce GT 1030 or Radeon RX 6400 low-profile). Storage bay details are sparse; expect space for at least one 2.5" drive and possibly a slim optical drive.
Product Info
The Inwin IW-BL634B/300B2 is sold through major retailers like Japan, priced around ¥18,939 as of this writing. It comes with a 1-year warranty from the local distributor in Japan. Market positioning is entry-level, offering decent build quality and integrated 80 PLUS Bronze PSU at a budget price. However, the low PSU wattage and lack of PSU upgradeability define its target audience.
Best Use Cases
Office PC / Business Desktop: Perfect for document work, spreadsheets, and video conferencing. Its compact footprint and quiet operation suit shared workspaces. POS / Retail Kiosk: The straightforward front I/O (USB and audio) makes it easy to connect peripherals like receipt printers, barcode scanners, and card readers. * Low-Power Home Server or NUC Alternative: With only 300W on tap, this case is great for an always-on file server or a lightweight media center running on an APU or low-end chip. ## Alternatives
Two similar slim cases are the Antec P8 Slim and the Fractal Design Node 202. The Antec P8 Slim also includes a 300W PSU and is comparably priced, but has a slightly different internal layout. The Node 202 is gamer-oriented, requiring a separate SFX PSU and offering better GPU support (up to full-height triple-slot cards) but costs significantly more. If you need GPU flexibility, Node 202 is a better choice; if you want a simple, low-cost office build, the Inwin IW-BL634B/300B2 is hard to beat.
Things to Consider
The built-in PSU is the most limiting factor: 300W restricts you to low-power CPUs (like Core i3 or Ryzen 3) and cannot support a dedicated high-end GPU. The 70mm CPU cooler limit rules out tower-style air coolers; only stock or low-profile coolers fit. Additionally, the case does not allow for PSU replacement — if your power needs grow, you must buy a new case. Storage expansion is limited, so plan your drives carefully. This case is definitely not for gaming or heavy rendering tasks.
