We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black steel Micro ATX slim case with side window, front USB and audio ports, 300W PSU installed

In Win

In Win BL631.FF300TB3F Micro ATX Slim PC case

SKU CH-7D3P-4FEBE MPN BL631.FF300TB3F

Slim steel Micro ATX case with 300 W PSU, four expansion slots, front USB 2.0 and 3.0 ports, plus audio, and room for five drives

  • Max graphics card length195 mm
  • Housing materialSteel
  • Power supply included300 W
  • Power supply300 W
  • Power supply mountingBottom
  • Supported motherboard sizesMicro ATX / Mini ITX
  • Includes a 300W power supply for immediate builds
  • Fits Micro ATX and Mini ITX motherboards in a slim frame
  • Four front USB ports — two 2.0 and two 3.0 — plus audio jacks
  • Five drive bays in total: one 5.25", one external 3.5", two internal 3.5" and one 2.5
  • Rear 80mm fan mount keeps airflow moving through the steel chassis

Micro ATX Slim Case with 300W PSU

The In Win BL631.FF300TB3F is a compact steel chassis that accepts Micro ATX and Mini ITX motherboards. It includes a pre-installed 300W TFX power supply mounted at the bottom, making it suited for space-constrained office or home builds that need a ready-to-use enclosure.

Thermals, Noise and Power Draw

A single 80mm rear fan provides the only active airflow path through the slim interior. The 300W supply limits total system power, so the case runs quietly with low-TDP processors and integrated graphics but cannot sustain high-wattage components under load.

Replaces Larger Towers for Basic Builds

This case replaces full-size ATX towers when desk space is tight and expansion needs are modest, offering one 5.25in bay, one external 3.5in bay, two internal 3.5in bays, one 2.5in bay and two hot-swap bays. The jump is worthwhile for builders who need four expansion slots and front USB 2.0, USB 3.0 and audio ports in a 13.6in tall footprint.

How it compares

Measured against everything we stock in Tower & Desktop PC Cases, at today’s prices. Recalculated every night.

Price $83.99
Cheaper than about 60% of the 1,468 comparable items (median $100.99).
Max graphics card length 195 mm
Lower than about 98% of the 894 comparable items (median 400 mm).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameIN WIN
Product lineBL631
Model nameBL631.FF300TB3F
Part numberBL631.FF300TB3F
Product typeMicro ATX Slim Case
Product colorBlack
Storage
5.25-inch external bays1
External 3.5" drive bays1
3.5-inch internal bays2
2.5-inch internal bays1
Hot-swappable bays2
Ports & slots
Expansion card slots4
Front panel ports2 x USB 2.0, 2 x USB 3.0, Audio
Power
Power supply included300 W
Power supply300 W
Size & build
Max graphics card length195 mm
Housing materialSteel
Power supply mountingBottom
Side panel typeWith Side Window
Fan mounting optionsRear - 1 × 80 mm
80mm fan countNo
Product dimensions13 in × 3.8 in × 16.1 in (with front panel)
13 in × 3.8 in × 14.4 in (w/o front panel)
Product weight5.897 kg
Shipping weight6.35 kg
Package size483 × 381 × 152 mm
Compatibility
Supported motherboard sizesMicro ATX / Mini ITX
CPU cooler height limit72 mm
PSU length limit300 W TFX PSU
In the box
Included itemsDesktop BL631 + 300 W
More details
40mm fans1
120mm fan countNo
140mm fansNo
180mm fans4
200mm fans1
220mm fans1
360mm fans2
Side air ductYes

Questions about this item

How do I install the motherboard in this 13.6-inch tall slim case, and what step often gets missed?

Mount the Micro ATX or Mini ITX board using the four expansion-slot brackets, then connect the front-panel USB 2.0, USB 3.0 and audio headers before sliding the board into the narrow chassis.

Which parts will need replacement first during long-term use?

The included 300 W TFX power supply and the single rear 80 mm fan are the only moving or ageing components; plan to swap them if noise or voltage drift appears.

What thermal limit appears first when the system runs sustained loads?

With only one rear 80 mm exhaust fan and a bottom-mounted 300 W PSU, the internal air temperature rises quickly, throttling CPU and GPU clocks before the case surfaces get hot.

More in Tower & Desktop PC Cases

Similar items