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HP Pro Mini 400 G9 Desktop PC

  • Windows 11 Pro
  • Intel® Core™ i3-12100T (up to 4.1 GHz with Intel® Turbo Boost Technology, 12 MB L3 cache, 4 cores, 8 threads)
  • 8 GB memory; 256 GB SSD storage
  • Intel® UHD Graphics 730See all Specs

Earn 1X HP Rewards Points
Protect your Device with an HP Care Pack
Product # 83T96UA#ABA
The HP Pro Mini 400 provides users with the commercial-grade performance, security, and the flexible deployment capabilities needed for small workspaces. This ultrasmall form factor PC is powered by an Intel® processor[2] and protected with always-on security you can trust.

Latest Intel® processor

Accomplish everything from minor tasks to complex projects with the latest Intel® processor.[2]

Flex ports for easy expansion

Configure or expand your Mini your way with flex ports for legacy or clean desk connectivity.

Protected by HP Wolf Security

HP Wolf Pro Security Edition PCs interlace HP Sure Click Pro with HP Sure Sense Pro providing more in-depth coverage than the standard versions through a 1-year or 3-year user license with HP Support.[4] This creates a powerful, single solution that doesn’t require an IT-managed PC environment.

Windows 11

Work anywhere without compromising on performance or security with Windows 11 powered by HP's collaboration and connectivity technology.

High performance, high portability

Get the exceptional combination of responsive performance, connectivity and speed with a 12th Gen Intel® Core™ processor that lets you launch, create, and connect fast and reliably.

Security is your top priority

The HP Wolf Pro Security Edition provides preconfigured enterprise-level PC protection for small and medium sized businesses.

Automatic recovery from firmware attacks

Firmware attacks can completely devastate your PC. Stay protected with HP’s self-healing BIOS - HP Sure Start Gen7 automatically recovers the BIOS from malware, rootkits, or corruption.

Work without interruption

Keep productivity high and downtime low with the fully integrated and automated features of the HP BIOSphere Gen6 firmware ecosystem. Your PCs have extra protection thanks to automatic updates and security checks.

Browse confidently

Help protect your PC from websites and read only Microsoft Office and PDF attachments with embedded malware, ransomware, or viruses with hardware-enforced security from HP Sure Click.

Erase your drive

HP Secure Erase removes the contents of a hard drive for repurposing or reassignment.

Simple PC management

Spend less time and get right to the updates you need with HP Support Assistant.

Speed up the basics of IT management

The HP Manageability Integration Kit helps speed up image creation and management of hardware, BIOS, and security through Microsoft System Center Configuration Manager.

Technical details

Operating system

Windows 11 Pro[1]


Intel® Core™ i3-12100T (up to 4.1 GHz with Intel® Turbo Boost Technology, 12 MB L3 cache, 4 cores, 8 threads)[6,7]


Intel® Q670 (vPro®)


Integrated: Intel® UHD Graphics 730


8 GB DDR4-3200 MHz RAM (1 x 8 GB)

Memory slots


Hard drive


Wireless technology

Intel® Wi-Fi 6E AX211 (2x2) and Bluetooth® 5.3 wireless card (supporting gigabit data rate)

Power supply

90 W external power adapter, up to 89% efficiency, active PFC

External I/O Ports

Front:1 headphone/microphone combo; 1 SuperSpeed USB Type-A 10Gbps signaling rate; 1 SuperSpeed USB Type-A 10Gbps signaling rate (charging); 1 SuperSpeed USB Type-C® 20Gbps signaling rate
Rear:1 power connector; 1 RJ-45; 1 SuperSpeed USB Type-A 10Gbps signaling rate; 2 SuperSpeed USB Type-A 5Gbps signaling rate; 2 DisplayPort™ 1.4; 1 HDMI 2.1

Expansion slots

1 M.2 2230; 1 M.2 22801 M.2 slot for WLAN and 1 M.2 2280 slot for storage.

Energy efficiency

EPEAT® registeredENERGY STAR® certified

Audio Features

Realtek ALC3252 codec, universal audio jack with CTIA and OMTP headset support

Form factor


Pointing device

HP 125 Wired Mouse


HP Wired Desktop 320K Keyboard

Dimensions (W X D X H)

6.97 x 6.89 x 1.34 in


3.13 lb


1 year (1/1/1) limited warranty includes 1 year of parts, labor and on-site repair. Terms and conditions vary by country. Certain restrictions and exclusions apply.

Support Service Included

HP 3 year Next Business Day Onsite Desktop Hardware Support.

Software included

HP Notifications; HP PC Hardware Diagnostics UEFI; HP Support Assistant; HP Connection Optimizer; HP Privacy Settings; HP PC Hardware Diagnostics Windows; HP Desktop Support Utilities; HP Easy Clean; Touchpoint Customizer for Commercial; HP Easy Clean Keyboard Driver; HSA Fusion for Commercial; HSA Telemetry for Commercial

Security management

Trusted Platform Module TPM 2.0 Embedded Security Chip shipped with Windows 10 (Common Criteria EAL4+ Certified)(FIPS 140-2 Level 2 Certified); HP Secure Erase; HP Sure Click; HP Sure Sense; Absolute Persistence module; HP Sure Admin; HP BIOSphere Gen6; HP Tamper Lock; HP Sure Start Gen7

Security software license

HP Wolf Pro Security Edition (1 year)[56]


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Get 50% off the Targus USB-C Universal DV4K Docking Station with purchase of a PC.

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HP Pro Mini 400 G9 Desktop PC is rated 4.1 out of 5 by 9.
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Rated 5 out of 5 by Mustang05dad from Awesome mini PC. Perfect for periodic desktop needs. Seamless setup and performed as expected. Exceptional value.
Date published: 2022-09-23
Rated 3 out of 5 by BarryISU from Slow out of box, but fine aft RAM upgrade from 8B It was slow out of the box, even after uninstalling unnecessary apps and updating BIOS, drivers, and all software. I bought an 8GB DIMM off Amazon for $20 and upgraded RAM from 8GB to 16GB. Now it works well. HP should not sell it with 8GB as it is almost nonfunctional. We almost returned it.
Date published: 2023-04-01
Rated 3 out of 5 by Anonymous from HP Prodesk Mini 400 G9 Wolf Pro The Mini is compact and sleek and well designed. However, performance so far is horrendous. Many times the system will take 45-60 minutes to shut down because of system work. What the work is is never clear, but I'm beginning to thing that HP Wolf and other bloatware is part of the problem. Hopefully performance will improve as initial system set up completes, but so far that hasn't happened.
Date published: 2023-02-28
Rated 3 out of 5 by KJGorman from Pleased so far. At the moment I'm rather unsure about the HP Mini. Right now it seems to be running although it took the usual couple of days to get Windows to the point where it was even sort of running usefully. Microsoft seems to be getting slower and more laden with silliness lately. But then some of your software also seemed to be part of the problem. Example: When I opened a Word document nothing happened for a long time until. eventually it opened up in an odd window that was an HP box of some sort. I went looking to see what was going on and found an enormous list of HP software items. I have no idea yet what any of your stuff does and I may get back to try to figure that out. For now I'm still trying to get the software I use downloaded and functioning. Once that's done, I will see if I can see what it is you folks are so proud of. I like the machine so far, but I go a long way back with computers. Back to the days of Radio Shack's Trash 80 and a clone of an apple 2 which I built from scratch under the leadership of a collection of guys at McMaster University who ran a course for a couple of dozen of us. Bare board, solder the chip sockets into place, load up the chips, and then send the thing off to be tested and the BIOS installed. Great fun. It lasted a couple of years before something fried it. I suspected lightning. I built another desktop many years later. A standard desktop with most of the bits in place but needing to be plugged in and the ribbon cables run. Things are not so simple now. I have this new toy running and will, I think, find it a decent computer. Fingers crossed for now and if you want to repeat this request in another couple of weeks I will see if I can report more sensibly of it for you.
Date published: 2023-01-24
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need 16G RAM and maybe better visdeo card, Can i customize the order?

Asked by: Anonymous
This HP Pro Mini 400 G9 Desktop PC is prebuilt and shipped as specified. For a customizable HP Pro Mini 400 G9 go to this link: https://www.hp.com/us-en/shop/pdp/hp-pro-mini-400-g9-desktop-pc-customizable-4g4n8av-1-
Answered by: HP Team Grant
Date published: 2023-04-07

What does "Windows 11 Pro (preinstalled with Windows 10 Pro Downgrade)" mean. Stated in the specs for your ProDesk 400 G9.

Asked by: DeanAI
Hello. Thanks for your question. This system is preinstalled with Windows 10 Pro software and also comes with a license for Windows 11 Pro software and provision for recovery software. You may only use one version of the Windows software at a time. Switching between versions will require you to uninstall one version and install the other version. You must back up all data (files, photos, etc.) before uninstalling and installing operating systems to avoid loss of your data.
Answered by: HP Live Expert Cheri
Date published: 2023-05-27
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Return and exchange information
HP.com will accept returns or exchanges for this product up to 30 days after delivery. A restocking fee may apply. For details, please visit: https://www.hp.com/us-en/shop/cv/returnsandexchanges.