HP Pro Mini 400 G9

Published on May 23, 2026

The HP Pro Mini 400 G9 takes the modular chassis of HP’s more expensive Elite Mini 800 G9 line and lands it at a friendlier office-IT price point, with a 14th Gen Intel Core i5-14500T at the heart of the configuration. This is a 1-liter business desktop sold for cube farms, reception kiosks, digital signage, and home offices where the desk has more paperwork than tower clearance. The 14-core, 20-thread processor pairs an integrated UHD Graphics 770 GPU with WiFi 6E and Bluetooth 5.3, and the chassis keeps two SODIMM slots, an M.2 NVMe slot, and a 2.5-inch SATA bay accessible behind a single thumbscrew. The configurations on the Starry Hope research desk are 14th-gen units that ship via Amazon in 16GB and 32GB RAM tiers with 512GB or 1TB NVMe drives, fronted by the same diamond-pattern grille HP has carried across the 400-series for two generations.

Pros and Cons of the HP Pro Mini 400 G9

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HP Pro Mini 400 G9 Comparison Chart

	HP Pro Mini 400 G9	HP Pro Mini 400 G9	HP Pro Mini 400 G9	HP Pro Mini 400 G9
Price	List Price: $799.99 Amazon Prices: Loading prices...	List Price: $1,079.99 Amazon Prices: Loading prices...	List Price: $1,019.99 Amazon Prices: Loading prices...	List Price: $1,229.99 Amazon Prices: Loading prices...
Version	16GB / 512GB / Core i5-14500T	16GB / 1TB / Core i5-14500T	32GB / 512GB / Core i5-14500T	32GB / 1TB / Core i5-14500T
Performance Rating	7.9	7.9	8.6	8.6
Operating System	Windows 11 Pro	Windows 11 Pro	Windows 11 Pro	Windows 11 Pro
Processor	Fourteen-core 1.70 Ghz (max 4.80 Ghz) Intel Core i5-14500T	Fourteen-core 1.70 Ghz (max 4.80 Ghz) Intel Core i5-14500T	Fourteen-core 1.70 Ghz (max 4.80 Ghz) Intel Core i5-14500T	Fourteen-core 1.70 Ghz (max 4.80 Ghz) Intel Core i5-14500T
GPU	Integrated Intel UHD Graphics 770	Integrated Intel UHD Graphics 770	Integrated Intel UHD Graphics 770	Integrated Intel UHD Graphics 770
RAM	16 GB DDR4 SO-DIMM, single-channel (Single SODIMM populated, second slot free)	16 GB DDR4 SO-DIMM, single-channel (Single SODIMM populated, second slot free)	32 GB DDR4 SO-DIMM, 2-channel (Dual-channel 2x16GB SODIMM)	32 GB DDR4 SO-DIMM, 2-channel (Dual-channel 2x16GB SODIMM)
Internal Storage	512 GB NVMe SSD	1 TB NVMe SSD	512 GB NVMe SSD	1 TB NVMe SSD
Dimensions width x length x thickness	6.97 x 6.89 x 1.34 inches (177.04 x 175.01 x 34.04 mm)	6.97 x 6.89 x 1.34 inches (177.04 x 175.01 x 34.04 mm)	6.97 x 6.89 x 1.34 inches (177.04 x 175.01 x 34.04 mm)	6.97 x 6.89 x 1.34 inches (177.04 x 175.01 x 34.04 mm)
Weight	3.13 lbs (1.42 kg)	3.13 lbs (1.42 kg)	3.13 lbs (1.42 kg)	3.13 lbs (1.42 kg)
WiFi	Wi-Fi 6E (802.11ax)	Wi-Fi 6E (802.11ax)	Wi-Fi 6E (802.11ax)	Wi-Fi 6E (802.11ax)
Bluetooth	Bluetooth 5.3	Bluetooth 5.3	Bluetooth 5.3	Bluetooth 5.3
Ethernet	1 Ethernet port at 1 Gbps	1 Ethernet port at 1 Gbps	1 Ethernet port at 1 Gbps	1 Ethernet port at 1 Gbps
HDMI	1 Full-Size HDMI Port	1 Full-Size HDMI Port	1 Full-Size HDMI Port	1 Full-Size HDMI Port
DisplayPort	2 DisplayPorts (2x DisplayPort 1.4; drives up to 3 displays with the HDMI output)	2 DisplayPorts (2x DisplayPort 1.4; drives up to 3 displays with the HDMI output)	2 DisplayPorts (2x DisplayPort 1.4; drives up to 3 displays with the HDMI output)	2 DisplayPorts (2x DisplayPort 1.4; drives up to 3 displays with the HDMI output)
VGA	No VGA Ports	No VGA Ports	No VGA Ports	No VGA Ports
USB Ports	2 USB 2.0, 5 USB 3, 2 USB-C Front: 1x USB-C 20Gbps, 2x USB-A 10Gbps. Rear: 1x USB-C 10Gbps, 3x USB-A 10Gbps, 2x USB-A 2.0.	2 USB 2.0, 5 USB 3, 2 USB-C Front: 1x USB-C 20Gbps, 2x USB-A 10Gbps. Rear: 1x USB-C 10Gbps, 3x USB-A 10Gbps, 2x USB-A 2.0.	2 USB 2.0, 5 USB 3, 2 USB-C Front: 1x USB-C 20Gbps, 2x USB-A 10Gbps. Rear: 1x USB-C 10Gbps, 3x USB-A 10Gbps, 2x USB-A 2.0.	2 USB 2.0, 5 USB 3, 2 USB-C Front: 1x USB-C 20Gbps, 2x USB-A 10Gbps. Rear: 1x USB-C 10Gbps, 3x USB-A 10Gbps, 2x USB-A 2.0.
Thunderbolt Ports	No	No	No	No
OCuLink	No	No	No	No
Internal SATA Ports	1 SATA port, includes 2.5" drive bay (One 2.5-inch internal drive bay)	1 SATA port, includes 2.5" drive bay (One 2.5-inch internal drive bay)	1 SATA port, includes 2.5" drive bay (One 2.5-inch internal drive bay)	1 SATA port, includes 2.5" drive bay (One 2.5-inch internal drive bay)
Card Reader	No Card Reader	No Card Reader	No Card Reader	No Card Reader
Headphone Jack	combo	combo	combo	combo
Fanless	No	No	No	No
VESA Mount	Yes	Yes	Yes	Yes
In the Box	Mini PC, 90W external power adapter, HP 125 wired keyboard, HP 125 wired mouse, HP Wolf Security.	Mini PC, 90W external power adapter, HP 125 wired keyboard, HP 125 wired mouse, HP Wolf Security.	Mini PC, 90W external power adapter, HP 125 wired keyboard, HP 125 wired mouse, HP Wolf Security.	Mini PC, 90W external power adapter, HP 125 wired keyboard, HP 125 wired mouse, HP Wolf Security.
Expandability	Two SODIMM slots up to 64GB DDR4, plus the 2.5-inch SATA bay alongside the M.2 NVMe slot for dual-drive setups.	Two SODIMM slots up to 64GB DDR4, plus the 2.5-inch SATA bay alongside the M.2 NVMe slot for dual-drive setups.	Two SODIMM slots up to 64GB DDR4, plus the 2.5-inch SATA bay alongside the M.2 NVMe slot for dual-drive setups.	Two SODIMM slots up to 64GB DDR4, plus the 2.5-inch SATA bay alongside the M.2 NVMe slot for dual-drive setups.

Detailed Insights into the HP Pro Mini 400 G9

The chassis measures 6.97 by 6.89 by 1.34 inches and weighs roughly 3.13 pounds per the HP datasheet, which puts it squarely in the 1-liter mini PC bracket alongside the Lenovo ThinkCentre Tiny and Dell OptiPlex Micro lines. HP runs a black diamond-pattern grille across the front face with the connectivity strip down low: 1x USB-C running at 20 Gbps, 2x USB-A at 10 Gbps, a combo headset jack, and a recessed power button. Around back you get 2x DisplayPort 1.4, 1x HDMI, 1x USB-C at 10 Gbps, 3x USB-A at 10 Gbps, 2x USB-A 2.0, the Gigabit Ethernet jack, and the 90W barrel input. NotebookCheck flagged the closed lid as a small thermal trade-off compared to perforated covers but praised the build quality: their reviewers wrote that “the workmanship is impeccable, which means that the HP Pro Mini 400 G9 earns nothing but praise from us, at this point.”

The 14th Gen Intel Core i5-14500T at the heart of the test configurations carries 14 cores (6 Performance, 8 Efficient) and 20 threads, with a 1.7 GHz base and a 4.8 GHz turbo on the P-cores, all inside a 35W power envelope. PassMark places the i5-14500T at roughly 23,000 points on the multi-thread benchmark, which is everyday-tier territory for spreadsheets, multi-tab browsing, and 1080p video calls but well short of gaming or 3D-rendering workloads. In NotebookCheck’s review of the official 937U0EA model the i5-14500T delivered “good efficiency” with the closed chassis, and TopTechChoices’ review summarized it as a “set it and forget it’ machine for running a business front desk, a kiosk, or a home office where desk space is precious.” On the integrated graphics side, the UHD Graphics 770 handles office video acceleration but is not built for AAA gaming or accelerated AI inference.

Connectivity options include WiFi 6E on the 802.11ax standard, Bluetooth 5.3 for keyboards and headsets, and a single Intel I219-LM Gigabit Ethernet port. NotebookCheck flagged the absence of 2.5GbE or 10GbE as the system’s most dated feature: their review called out the “Ethernet port is limited to 1 Gbit speed” as a real limitation compared to the Elite Mini 800 G9 which can take a Flex IO networking module. Storage expansion is the bright spot of this generation. Two SODIMM slots support up to 64GB of DDR4, one M.2 2280 slot holds the boot NVMe drive, a 2.5-inch SATA bay sits under the main board for a secondary mechanical or SATA SSD, and a smaller M.2 2230 socket carries the WiFi card. Tool-less entry via a single thumbscrew makes the upgrades genuinely friendly.

Reviewer Insights on the HP Pro Mini 400 G9

NotebookCheck

NotebookCheck tested the official HP 937U0EA configuration with the i5-14500T and ultimately scored it 71 percent. Their verdict described “a compact office workstation that impresses with good efficiency and a sustainable modular design, though it lacks modern high-speed connectivity.” The chassis design earned the strongest praise: the publication noted that “the modular design is great and scores points in terms of sustainability” and credited the closed lid for keeping dust intake low.

The criticisms came in two flavors. On the connectivity side, NotebookCheck called out the missing USB4, Thunderbolt, and OCuLink ports along with the 1 Gbps Ethernet ceiling, writing that “there are no modern USB4 ports or even an OCuLink connection.” On the configuration side, the reviewer flagged that the test memory was running in single-channel mode, which capped multi-threaded performance below what the i5-14500T can sustain in dual-channel. That is a buyer behavior fix more than a chassis flaw, since the second SODIMM slot is empty in the entry tier and trivially populated.

PCWorld

PCWorld’s review by Mattias Inghe covered the earlier i5-12500T variant of the same chassis and gave it 3 out of 5 stars. The verdict was that “the HP Pro Mini 400 G9 may not be the prettiest or most powerful mini PC we’ve ever seen, but it offers reliable performance for browsing and day-to-day tasks.” Inghe was particularly complimentary about the front-panel port layout: “built more for practicality than ornamentation, you get plenty of fast USB ports and headphone jacks readily available in the front panel.”

The PCWorld piece flagged a couple of patterns worth noting for the 14th-gen units sold today. First, the processor’s six performance cores on the older 12500T could “push individual cores high for short periods of time, but do not do so well for high continuous loads,” a thermal observation the 35W TDP imposes on the 14500T as well in this small chassis. Second, while HP “gets a gold star for an ambitious attempt to keep the fan noise down despite a powerful desktop processor,” there is still some audible fan output under load, which is something to factor in for whisper-quiet office environments.

TopTechChoices

TopTechChoices scored a 14500T configuration 70.8 out of 100 and recommended it specifically at or near a $680 street price. Their summary called it “incredibly compact and portable,” with “a good port selection with modern WiFi 6E and Bluetooth 5.3” supporting up to three monitors. The reviewer also noted high reliability scores in the publication’s tracked data set, placing the platform in the 78th percentile for long-term durability.

The negatives clustered around graphics and storage. “Don’t expect to play anything more demanding than solitaire,” the review noted of the integrated UHD 770, and “very limited storage with only a 256GB SSD” applies to entry HP-direct configurations though not to the 512GB and 1TB ME2-upgraded versions on Amazon. The 90W power brick was also called out as limiting any future GPU or storage expansion ambitions, which is consistent with HP’s “this is a thin client and an office PC, not a workstation” framing of the entire 400 line.

Aleg Reviews

Aleg Reviews’ video walkthrough covers the same chassis with a 12th Gen i5-12500T inside, and the hands-on internal tour applies one-for-one to the 14500T units sold under the 14th-gen revision. The reviewer praises the easy serviceability: “we have here another slot so you can have two eights,” referring to the empty second SODIMM and the simple swap path for users who buy the 16GB tier and want to step up to 32GB or 64GB later. The video also confirms the front USB-C is “20 gigabyte per second” and the rear DisplayPort 1.4 and HDMI combo on this chassis design.

Across these four reviews the consensus is consistent. Build quality, port mix, and serviceability are strengths, while the dated 1 Gbps Ethernet and the lack of USB4 or Thunderbolt are universal complaints. Nobody is buying this for gaming or AI inference; everyone agrees it is a quiet, dependable office desktop with HP’s commercial warranty story attached.

Customer Reviews of the HP Pro Mini 400 G9

The Amazon listings for the 14th-gen configurations covered here are sold and warrantied by MichaelElectronics2 (ME2), a third-party upgrader that takes HP-spec units and installs the 16GB/32GB DDR4 and 512GB/1TB NVMe drives before shipping. At the time of writing the storefront listings carry an “In Stock” status with the i5-14500T variants ranking in the top tier of the Computers and Accessories sales rank, but the review counts on the new SKUs are still building. Buyers shopping these particular ASINs should weigh the ME2 three-year warranty on the RAM and SSD upgrades against the HP-direct warranty path, which is more limited but covers the base chassis under HP’s commercial support.

For broader customer sentiment, the Pro Mini 400 G9 family on HP’s commercial channel and on resellers like CDW and Insight has converged on the same themes flagged by the reviewers: reliable for office workloads, quiet most of the time, and a sensible thin-client or kiosk choice. Buyers who treat it as a casual gaming or video-editing rig consistently report disappointment, which lines up with both NotebookCheck’s and TopTechChoices’ positioning.

Conclusion

The HP Pro Mini 400 G9 is a sensible pick for an office desk, a wall-mounted digital-signage deployment, or a home office where Microsoft 365, a video meeting, and a stack of browser tabs is the daily workload. The 14th Gen i5-14500T has enough headroom for everyday productivity, and the chassis is one of the better-built commercial 1-liter designs HP has shipped, with two SODIMM slots, an M.2 NVMe slot, a 2.5-inch bay, and tool-less entry. If you already run an HP commercial fleet, the BIOSphere firmware ecosystem and HP Wolf Security bundle slot directly into existing management.

Users chasing a small-chassis gaming or AI rig should look elsewhere. The integrated UHD Graphics 770 is built for office productivity, not 3D titles, and the absence of USB4 or Thunderbolt rules out fast external GPU or storage cages. Buyers who care about wired throughput should also note the 1 Gbps Ethernet ceiling and consider chassis like the Elite Mini 800 G9 with its Flex IO 2.5GbE module, or an AMD Ryzen mini PC with 2.5GbE built in.

For those comparing options, see our Mini PC Comparison Chart to find the best match for your needs.

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