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3,183 reviews at Trustpilot.3,183 reviews
U3 Micro-ATX Aluminium Case, Black
U3 Micro-ATX Aluminium Case, Silver
More variations available Show

Jonsbo U3 Micro-ATX Aluminium Cases

The U3 is the largest of the models in the attractive U series aluminium cases. Larger than the U1 and the U2, the U3 can accommodate ATX PSUs, Micro ATX motherboards and a graphics card with ease.

The U3 is the largest of the attractive U series cases from Jonsbo. The main feature of this case series is the timeless design line with the elegantly rounded corners and a very appealing exterior.


  1. Full aluminium compact chassis
  2. Compatible with Micro-ATX motherboards
  3. 120mm rear cooling fan supplied
  4. Installation of a ATX PSU and a graphics card are possible

The refined and at the same time unobtrusive design of the case ensures that it can blend in with any interior style. The blue illuminated power button is recessed into the sleek front, as well as the I/O panel with 2x USB 3.0 and the HD audio connectors. The U3 is made of 2.0 mm thick anodised aluminium and available in black and silver.

Based on experience and after careful study of current customer requirements, Jonsbo’s focus was to develop a case series to implement the original M-ATX/Mini-ITX - thought. For this reason, they decided not to implement assembly areas for optical drives and long video cards. VGA cards up to a length of 260 mm length and CPU coolers up to a height of 175 mm are supported – which allows for the installation of very powerful configurations with sufficient space for most popular configurations.

This high-quality and well-manufactured Micro-ATX case supports motherboards up to a maximum size of 245 x 245 mm. The installation of the motherboard is very simple - after removing the left side panel it can be installed with little effort on the right side panel. ATX power supplies can be installed in the U3 and a total of four PCI expansion slots are available.

In order to guarantee a particularly smooth-running system, the hard disk drives are anti-vibration mounted at the bottom of the case. Either install two 2.5” or one x 3.5” HDD / SSD. In additional a 3.5” HDD can be accommodated in side-mounted HDD rack.

For effective ventilation the U3 comes with a quiet 120 mm fan preinstalled at the rear panel. The speed of the fan can be adjusted via an external, multi-stage switch individually to the users liking.

The U3 is aimed at users who are looking for a very stylish PC for typical living room applications. With space for up to four expansion cards and a high-performance graphics cards means a very compact and powerful PC can be configured.

The stylish case rests on vibration-decoupled case feet giving it an appealing look of a high-quality Hifi component.

Two USB 3.0 connectors are available externally. Therefore, external hard disk or USB drives can be connected quickly and easily.

Show specifications and reviews for:
SpecificationsJonsbo U3 BlackJonsbo U3 Silver
Form Factor MotherboardMicro-ATX Micro-ATX
Form Factor PSUATX ATX
Drive baysTotal of 3 from either 2x 3.5” or 2x 2.5" Total of 3 from either 2x 3.5” or 2x 2.5"
Case fan (rear)1 x 120 mm (supplied) 1 x 120 mm (supplied)
Height x Width x Depth371 x 208 x 270 mm 371 x 208 x 270 mm
Weight3.1 kg 3.1 kg
Material2.0 / 1.5 mm aluminium 2.0 / 1.5 mm aluminium
Maximum height of CPU coolers175 mm 175 mm
Maximum length of VGA cards260 mm 260 mm
Warranty24 months 24 months
EAN barcode4250140364708 4250140364609
SpecificationsJonsbo U3 BlackJonsbo U3 Silver
Case TypeHTPC / ATX
Form Factor MotherboardMicro-ATX
Form Factor PSUATX
Drive baysTotal of 3 from either 2x 3.5” or 2x 2.5"
Case fan (rear)1 x 120 mm (supplied)
Height x Width x Depth371 x 208 x 270 mm
Weight3.1 kg
Material2.0 / 1.5 mm aluminium
Maximum height of CPU coolers175 mm
Maximum length of VGA cards260 mm
Warranty24 months
EAN barcode4250140364708 4250140364609

Customer Reviews

Jonsbo U3 Black
Jonsbo U3 Silver

We haven't received any reviews of this product yet.

Excellent case.


Really impressed with this case. Well made and looks good.

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“Great service, quick shipping.”

5th April 2019 via Trustpilot