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HP EliteOne 840 G9 All-in-One 24" Intel Core i7-14700 / 32GB RAM / 512GB SSD specifications and in-depth review

HP EliteOne 840 G9 All-in-One 24" Intel Core i7-14700 / 32GB RAM / 512GB SSD

Manufacturer: HP

The HP EliteOne 840 G9 All-in-One is a 23.8-inch desktop unit built around a desktop-class Intel Core i7-14700 processor, combining the display and computing hardware into a single chassis with an internal power supply. It ships with 32GB of DDR5 RAM running at 5600 MHz and a 512GB flash storage drive, and carries a 3-year warranty alongside a top energy efficiency rating. The machine includes stereo speakers, a dual-microphone array, and a 5MP front camera with a physical privacy shutter, making it a reasonably self-contained workstation out of the box.

The 23.8-inch display outputs at 1920 x 1080 px with a pixel density of 95 ppi, a 60Hz refresh rate, and wide 178-degree viewing angles both horizontally and vertically; it features an anti-reflection coating but does not support HDR10, HDR10+, Dolby Vision, or touch input. The Intel UHD Graphics 770 integrated GPU boosts up to 1600 MHz and can drive up to four displays via one HDMI port, one DisplayPort, and two USB-C outputs. Connectivity options include Wi-Fi 6E, Bluetooth 5.3, a single RJ45 Ethernet port, five USB 3.0 ports, two USB-C ports, and a 3.5 mm audio jack, while there are no Thunderbolt ports. On the CPU side, the i7-14700 uses a big.LITTLE architecture across 28 threads, reaches up to 5.4 GHz in turbo mode within a 65W TDP, and scores 41,514 on PassMark multi-core and 15,875 on Geekbench 6 multi-core.

Pros
  • The 28-thread CPU with a big.LITTLE architecture and 5.4 GHz turbo boost delivers strong multi-core throughput for an All-in-One, reflected in a PassMark score of 41,514 and a Geekbench 6 multi-core result of 15,875
  • ECC memory support is included, adding data integrity protection that is uncommon in consumer All-in-One desktops and relevant for reliability-sensitive workflows
  • A physical privacy shutter over the 5MP front camera provides a hardware-level way to block the lens when the camera is not in use
  • The 3-year warranty provides an extended coverage period that reduces long-term maintenance uncertainty for business deployments
  • Wi-Fi 6E support enables access to the less congested 6 GHz wireless band, complementing the wired Ethernet connection
  • The internal power supply keeps the desk setup clean by eliminating the need for an external power brick
Cons
  • The 23.8-inch display is limited to a 1920 x 1080 px resolution at 60Hz with no HDR10, HDR10+, or Dolby Vision support, which restricts the display's suitability for color-critical or high dynamic range work
  • No Thunderbolt ports are available, which limits high-bandwidth peripheral and external display connectivity options
  • Neither a fingerprint scanner nor 3D facial recognition is present, leaving password entry as the only built-in authentication method
  • The display does not support touch input, which may be a limitation for users accustomed to touch-based workflows on All-in-One systems
  • There is no external memory card slot, removing a common and convenient option for transferring files from cameras or other devices
Who is this for?

The HP EliteOne 840 G9 is well-matched to business and professional office environments where a tidy, self-contained workstation matters — the internal power supply, dual-microphone array, 5MP webcam with physical privacy shutter, and stereo speakers make it a capable all-in-one for day-to-day office tasks and video conferencing without requiring additional peripherals. The 28-thread CPU with a 5.4 GHz turbo ceiling and a PassMark score exceeding 41,000 gives it enough headroom for demanding productivity workloads, and ECC memory support makes it a considered choice for users in environments where data reliability is a priority. The 3-year warranty and top energy efficiency rating further reinforce its suitability for managed business deployments where longevity and running costs over time are relevant factors.

Who is this NOT for?

Users who need a display suited to color-critical or media production work will find the 1920 x 1080 resolution with no HDR support a limiting factor, as the panel lacks the dynamic range and pixel density expected in creative workflows. The absence of Thunderbolt ports and the constraint to a single USB 3.2 Gen 2 connection make it a poor fit for professionals who rely on high-bandwidth external storage or display daisy-chaining. Additionally, users who require touch-based interaction or biometric login through fingerprint or facial recognition will find those capabilities entirely absent, making the unit less suited to modern hot-desk or shared-access setups where such features are increasingly expected.

Performance:

CPU speed 8 x 2.1 & 12 x 1.5 GHz
RAM 32GB
GPU clock speed 300 MHz
PassMark result 41514
PassMark result (single) 4270
CPU threads 28 threads
DDR memory version 5
GPU turbo 1600 MHz
RAM speed 5600 MHz
semiconductor size 10 nm

The HP EliteOne 840 G9's processor is built on a 10 nm process and runs a 28-thread configuration using a big.LITTLE-style layout, with 8 performance cores at 2.1 GHz and 12 efficiency cores at 1.5 GHz as base clocks. The integrated GPU operates at 300 MHz base and boosts to 1600 MHz in turbo mode. System memory stands at 32GB of DDR5 running at 5600 MHz, providing a solid bandwidth foundation for the integrated graphics and general workloads. In benchmarking, the system achieves a PassMark multi-core score of 41,514 and a single-core result of 4,270, reflecting the throughput the 28-thread CPU configuration delivers across both sustained and burst tasks.

Display:

pixel density 95 ppi
resolution 1920 x 1080 px
has anti-reflection coating ✓
screen size 23.8"
refresh rate 60Hz
supports Dolby Vision ✕
supports HDR10+ ✕
supports HDR10 ✕
supported displays 4
Has a curved display ✕
has a touch screen ✕
maximum horizontal viewing angle 178º
maximum vertical viewing angle 178º

The HP EliteOne 840 G9 features a 23.8-inch flat display running at 1920 x 1080 px with a pixel density of 95 ppi and a 60Hz refresh rate. Viewing angles reach 178 degrees both horizontally and vertically, and an anti-reflection coating is present to reduce glare in bright environments. The panel does not support HDR10, HDR10+, or Dolby Vision, and it is neither curved nor touch-enabled. Despite the built-in screen, the system's GPU can drive up to four displays simultaneously, allowing for expanded multi-monitor setups via the available video outputs.

Connectivity:

Wi-Fi version Wi-Fi 6E (802.11ax), Wi-Fi 6 (802.11ax), Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
Bluetooth version 5.3
supports Ethernet ✓
USB-C ports 2
has an external memory slot ✕
has an HDMI output ✓
HDMI ports 1
has a socket for a 3.5 mm audio jack ✓
DisplayPort outputs 1
mini DisplayPort outputs 0
USB 3.0 ports 5
RJ45 ports 1
Has USB Type-C ✓
Thunderbolt ports 0

The HP EliteOne 840 G9 supports Wi-Fi 6E (covering 802.11n/ac/ax standards including the 6 GHz band) alongside Bluetooth 5.3 and wired Ethernet via a single RJ45 port. For USB connectivity, it provides five USB 3.0 ports and two USB-C ports, though no Thunderbolt ports are present. Display output options include one HDMI port and one DisplayPort output, with no mini DisplayPort available. A 3.5 mm audio jack is included, and there is no external memory card slot.

Features:

has Dolby Atmos ✕
has a front camera ✓
megapixels (front camera) 5MP
has an ambient light sensor ✕
Uses 3D facial recognition ✕
Has a fingerprint scanner ✕

The HP EliteOne 840 G9 includes a 5MP front-facing camera for video calls and conferencing, but does not offer 3D facial recognition or a fingerprint scanner for biometric login. Dolby Atmos audio and an ambient light sensor are also absent from this configuration.

Design:

Has an internal power supply ✓
has a privacy shutter ✓
supports portrait mode ✕

The HP EliteOne 840 G9 houses an internal power supply, eliminating the need for an external power brick and keeping the desk setup tidy. A physical privacy shutter is built in to cover the front camera when not in use. The unit does not support portrait mode orientation.

General info:

warranty period 3 years
internal storage 512GB
Uses flash storage ✓
number of microphones 2
has stereo speakers ✓
has top energy efficiency rating ✓

The HP EliteOne 840 G9 ships with a 512GB flash storage drive and carries a 3-year warranty, which is a notable inclusion for a business-oriented All-in-One. The unit has a top energy efficiency rating, reflecting its power consumption credentials. For audio and communication, it includes stereo speakers and a dual-microphone array, providing a functional built-in setup for calls and general use without requiring external accessories.

Miscellaneous:

Geekbench 6 result (multi) 15875
Geekbench 6 result (single) 2716
PassMark result (overclocked) 45492
GPU name UHD Graphics 770
Type Desktop
CPU socket LGA 1700
chipset B760, H770, Z790, H610, H670, B660, Z690
instruction sets MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, SSE 4.2
L3 cache 33 MB
L2 cache 28 MB
clock multiplier 21
Has an unlocked multiplier ✕
Has NX bit ✓
Supports 64-bit ✓
uses multithreading ✓
Turbo Boost version 2
CPU temperature 100 °C
PCI Express (PCIe) version 5
render output units (ROPs) 8
texture mapping units (TMUs) 16
shading units 256
OpenCL version 3
OpenGL version 4.5
GPU execution units 32
Has integrated graphics ✓
Supports ECC memory ✓
maximum memory bandwidth 89.6 GB/s
memory channels 2
RAM speed (max) 5600 MHz
maximum memory amount 192GB
Thermal Design Power (TDP) 65W
turbo clock speed 5.4GHz
Uses big.LITTLE technology ✓

The HP EliteOne 840 G9 uses a desktop-class LGA 1700 CPU with a big.LITTLE architecture, Turbo Boost 2, a turbo ceiling of 5.4 GHz, and a 65W TDP, rated to a maximum temperature of 100°C; the clock multiplier is locked at 21. The processor supports multithreading, 64-bit operation, NX bit, and the following instruction sets: MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2. Cache is structured across 28 MB of L2 and 33 MB of L3, and the platform connects via PCIe 5. Memory support extends to a maximum of 192GB across two channels at up to 5600 MHz with a peak bandwidth of 89.6 GB/s, and ECC memory is supported. The integrated Intel UHD Graphics 770 features 32 execution units, 256 shading units, 16 TMUs, and 8 ROPs, with OpenCL 3 and OpenGL 4.5 support. Geekbench 6 results are 15,875 multi-core and 2,716 single-core, and the overclocked PassMark score reaches 45,492. Compatible chipsets include B760, H770, Z790, H610, H670, B660, and Z690.

Final Verdict

The HP EliteOne 840 G9 All-in-One positions itself as a solid business desktop, built around a 28-thread CPU that handles sustained multi-threaded workloads with confidence, backed by a 3-year warranty and a top energy efficiency rating that suit managed office deployments well. Its ECC memory support combined with Wi-Fi 6E and a physical camera privacy shutter reflect a thoughtful specification for professional environments where reliability, security, and connectivity all carry weight. That said, the 1080p display without HDR and the absence of Thunderbolt ports and biometric authentication do define clear boundaries for what this machine is built for. For office-oriented productivity, video conferencing, and reliability-focused use cases, the EliteOne 840 G9 delivers a coherent and well-rounded package — users with demands beyond that scope will need to look at a more specialized configuration.