HP Pro Mini 400 G9 Desktop Computer 64GB DDR5, 2TB SSD - Compact

In this review of the HP Pro Mini 400 G9 Desktop Computer the bottom line is simple: it is a compact, business-focused mini PC built for multitasking and dense workstation setups. With an Intel Celeron G6900T, up to 64GB DDR5 RAM support and a 2TB PCIe M.2 SSD included in this configuration, the system balances energy-efficient daily performance and large local storage in a very small footprint. The inclusion of Windows 11 Pro, wired keyboard and mouse, and multiple display outputs makes it a practical choice for office users who need reliable, expandable hardware without a tower.

Key Features

• Processor: The Intel Celeron G6900T provides consistent low-power performance for office apps and web workloads while keeping thermals and noise low.
• Memory: Up to 64GB of DDR5 RAM support gives ample headroom for heavy browser use, multiple virtual desktops, and productivity software.
• Storage: The 2TB PCIe M.2 SSD in this configuration offers fast boot and application load times plus plenty of local storage for documents and projects.
• Connectivity: Built-in Wi-Fi 6E and Bluetooth 5.3 provide modern wireless networking and peripheral support for faster local networks and quieter setups.
• Display options: Three monitor outputs (two DisplayPort 1.4 plus HDMI 2.1) let users run multi-monitor workstations for spreadsheets, design previews, or trading screens.
• I/O convenience: A mix of SuperSpeed USB-A and USB-C front and rear ports plus an Ethernet jack make device connections and file transfers straightforward.

Who It's For

The Pro Mini 400 G9 is best for office professionals, receptionists, educators, and small business owners who need a compact desktop that can handle multiple apps, many browser tabs, and multi-monitor setups without taking much desk space. Its Windows 11 Pro license and wired input devices make it ready for corporate deployments and managed IT environments.

Users who need high-end gaming performance, intensive 3D rendering, or workstation-grade CPUs and GPUs should look elsewhere; the Celeron processor and integrated Intel UHD Graphics 710 are not designed for heavy graphics workloads or sustained CPU-intensive tasks.

Pros & Cons

Pros

• Compact design with strong expandability for RAM and PCIe storage keeps desktop real estate free.
• Multiple display outputs and modern wireless options support flexible multi-monitor and network setups.
• Large included SSD and support for up to 64GB DDR5 make it responsive for business workflows.

Cons

• Intel Celeron G6900T limits single-threaded and heavy compute performance compared with higher tier CPUs.
• No included PC stand and no optical drive, so some mounting or accessories must be purchased separately.

Specifications

Our Verdict

The HP Pro Mini 400 G9 in this 64GB/2TB configuration is a sensible, compact workstation for business users who prioritize multi-monitor productivity, fast local storage, and modern connectivity over raw CPU power. It represents good value for organizations that need quiet, space-saving desktops with room to upgrade memory and storage over time.

Frequently Asked Questions

Does this mini PC include a keyboard and mouse?
The system ships with an HP black wired keyboard and mouse included.

Can it drive three monitors simultaneously?
Yes; the unit has two DisplayPort 1.4 outputs and one HDMI 2.1 output for three-monitor configurations.

Is the PC stand included?
No; a PC stand is not included and must be purchased separately if needed.