Jonsbo D300 mATX Case – Strong Airflow Performance

About the Jonsbo D300 mATX Case

The Jonsbo D300 mATX case delivers serious cooling capacity in a compact footprint that fits smaller desks without forcing component compromises. This case supports M-ATX and ITX motherboards while maintaining compatibility with full-size GPUs up to 430mm and CPU coolers up to 180mm. The 4mm tempered glass side panel adds visual appeal while tool-free drive installation makes builds faster. PC builders who want smaller form factor systems without sacrificing cooling performance or GPU clearance find the D300 handles their requirements effectively.

What This Jonsbo D300 Does for You

Building a custom PC in the D300 means you're not locked into low-profile components or dealing with thermal throttling. The top panel accepts 240mm or 360mm radiators for serious liquid cooling setups while the rear supports 120mm or 140mm fans. Side mounting accommodates three 120mm fans and the bottom fits another 120mm for maximum airflow. GPU clearance up to 430mm means RTX 5070 Ti, RTX 5080, and RX 7900 series cards install without modification. PSU support up to 200mm handles most modern power supplies while CPU cooler clearance of 180mm accepts tower air coolers. The front USB 3.2 Gen2 Type-C port delivers fast connectivity for external drives and peripherals without reaching around back.

Build Quality and Design

The 4mm tempered glass side panel is thicker than budget alternatives and shows your components clearly. Steel construction weighs 8kg providing solid stability while the black or white finish options match different build aesthetics. Three drive bay configurations let you mix 2.5-inch SSDs and 3.5-inch HDDs based on your storage needs. Tool-free drive installation speeds up builds and upgrades. The power supply chamber supports two 120mm or one 140mm fan for additional cooling without cluttering your main component area.

Perfect For

• M-ATX gaming builds requiring strong GPU cooling and full-size card support for custom PC performance
• ITX systems where builders want flexibility to upgrade to M-ATX motherboards later without changing cases
• First-time builders who need straightforward assembly with good cable management and drive installation
• Compact workstations running multi-GPU setups or high-wattage components that generate significant heat

Why Buy from Mansa Computers

• 1-year Singapore warranty with Jonsbo service support
• Fast WhatsApp inquiry response for compatibility questions
• Open 7 days a week for support and pickup
• Home delivery available for bulky case shipments

Technical Specifications Summary

Motherboard Support
ITX / M-ATX

GPU Clearance
Up to 430mm

CPU Cooler Height
Up to 180mm

Radiator Support
Top: 240/360mm
Rear: 120/140mm

Front I/O
USB 3.2 Gen2 Type-C, 2× USB 3.0, Audio

Side Panel
4mm Tempered Glass

PSU Support
Up to 200mm

Dimensions
236.4 × 420.9 × 460.2 mm

The Jonsbo D300 mATX tempered glass case gives you compact dimensions with full-size component support and cooling flexibility. Order yours today with 1-year Jonsbo Singapore warranty and fast WhatsApp support from Mansa Computers.

Model
D300

Brand
Jonsbo

Dimension (W x H x D)
236.4 x 420.9 x 460.2 mm

Glass
4mm tempered glass

Motherboard
ITX / M-ATX

Drive Bays
2.5"SSD x 2, 3.5"HDD x 1 or
2.5"SSD x 1, 3.5"HDD x 2 or
2.5"SSD x 3

Front IO Port
1 x USB3.2 Gen2 Type-C
2 x USB3.0
1 x AUDIO & MIC

Power Supply
≤200mm

CPU Cooler
≤180mm

Video Card
≤430mm

Radiator support
Top: 240/360
Rear: 120/140

Fan mounting position
Top: 120mm x 3 or 140mm x 2(optional)
Side: 120mm x 3(optional)
Rear: 120mm x 1 or 140mm x 1(optional)
Bottom: 120mm x 1(optional)
Power supply chamber: 120mm x 2 or 140mm x 1（optional）

Weight
Net 8.0kg

1 Years Warranty

Tech Dynamic Pte Ltd
514 Chai Chee Ln #05-09, Singapore 469029
Contact: 6717 3000

Frequently Asked Questions About Jonsbo D300 mATX

What GPU sizes fit in the Jonsbo D300 mATX case?

The D300 supports graphics cards up to 430mm long. This includes RTX 5080, RTX 5070 Ti, and RX 7900 XTX cards without modification.

Can I build a high-airflow gaming system in this case?

Yes, the D300 supports top 360mm radiators plus rear 120/140mm fans for excellent cooling. Side and bottom fan mounts add more airflow options for high-wattage builds.

Does the D300 work with standard ATX motherboards?

No, the D300 supports M-ATX and ITX motherboards only. Standard ATX boards are too large for this compact case design.

What warranty coverage does Mansa provide?

You get 1-year Jonsbo Singapore warranty with local service support. Contact us via WhatsApp for fast inquiry response seven days a week.

How does the D300 compare to other compact cases?

The D300 offers 360mm radiator support and 430mm GPU clearance that many compact cases sacrifice. The 4mm tempered glass and USB Type-C front I/O add value.

How long will it take to receive my purchase?

Standard Shipping - 3 to 5 days
Express Shipping - 1 to 2 days

Can I opt for store pickup?

Yes, we are open daily for collection from 11 AM - 6.30 PM.

Address: 1 Ubi View #01-22, Focus One Building Singapore 408555 (Door located nearest to carpark exit gantry) We will contact you once your order is ready for collection!