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  1. Home
  2. HP Laptops

HP EliteBook 645 G9 Review


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Main Features

  • Launched in January 2022
  • Display:14.0" TFT VA, 16:10 Aspect Ratio
  • Max Brightness: 250 nits
  • External Dimensions: 321.9 x 213.9 x 19.9 mm (12.67 x 8.42 x 0.78 inches)
  • Weight: 1.37 kg (3.02 lbs)
  • Operating System: Windows
  • Replaced by HP EliteBook 645 G10
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HP EliteBook 645 G9 Overview



SCORING
Size
Display
Connectivity

Launched in January 2022, HP EliteBook 645 G9 is a Ultralight Windows laptop with 14.0-inch display and 16:10 aspect ratio. It has the external dimensions of 321.9 x 213.9 x 19.9 mm (12.67 x 8.42 x 0.78 inches) and weighs 1.37 kg (3.02 lbs).

HP EliteBook 645 G9 has an average MSRP range between $1200-1600. Price may vary based on the selected configuration.

Click for Available Configurations of the
HP EliteBook 645 G9

CPU:
RAM:
DISPLAY:
BATTERY:

EliteBook 645 G9 is a member of HP's EliteBook series of laptops. Below you can find the latest models from this series.

HP EliteBook Series History
Model Release Date Screen Size Weight
HP EliteBook X G1a 14
Compare
September 2024 14.0" 1.49 kg (3.29 lbs)
HP EliteBook Ultra 14
Compare
May 2024 14.0" 1.34 kg (2.95 lbs)
HP Elitebook 1040 G11
Compare
April 2024 14.0" 1.18 kg (2.6 lbs)
HP EliteBook 860 G11
Compare
March 2024 16.0" 1.71 kg (3.77 lbs)
HP EliteBook 830 G11
Compare
March 2024 13.3" 1.23 kg (2.71 lbs)
HP EliteBook 630 G11
Compare
March 2024 13.3" 1.29 kg (2.84 lbs)
HP EliteBook 840 G11
Compare
March 2024 14.0" 1.41 kg (3.11 lbs)
HP EliteBook 640 G11
Compare
March 2024 14.0" 1.39 kg (3.06 lbs)

HP EliteBook 645 G9 PROs and CONs

Now let's get in to more details of our HP EliteBook 645 G9 review by analyzing its specs and features and listing out its pros and cons compared to average competitor laptop in its class.

PROs
Lightweight at only 1.37 kg (3.02 lbs)
High Screen to Body ratio of ~82.5%
Low fan noise level
180° Screen Opening Angle
Matte Screen reduces reflections
7 nm CPU Fabrication Process
7 nm GPU Fabrication Process
Fast Charging Feature
USB Power Delivery
Max RAM Size of 64 GB
Upgradable RAM
PCI-E Gen 4.0 (4x) RAM
Upgradable Storage
NVMe Type SSD Storage
Wi-fi v6E
3x USB 3.2 USB-A Ports
1x USB 4.0 USB Type C Ports
HDMI Port
HDMI 2.1 supports higher refresh rates and resolutions
RJ45 Ethernet Port
Keyboard Backlight

CONs
Low PPI of 112 ppi
1280 x 720 Webcam Resolution
No Built-in SD Card Reader

Body and Dimensions

The weight and external dimensions are two of the most important factors determining the physical portability of a laptop. Below you can find the external physical features of the HP EliteBook 645 G9:


Physical Specs
Dimensions 321.9 x 213.9 x 19.9 mm
12.67 x 8.42 x 0.78 inches
Weight 1.37 kg (3.02 lbs)
Surface Area 689 cm2 (106.7 inches2)
Screen to Surface Ratio ~82.5%
Side Bezel Thickness ~10.2 mm
Weight per Inch of Screen 0.10 kg/inch
0.22 lbs/inch
Colors Silver
Cover Opening Angle 180°

Weight
The HP EliteBook 645 G9 weighs 1.37 kg / 3.02 lbs. Considering that average weight of the laptops with display size '14.0-14.9 inches' in our database is 1.42 kg, it will be fair to say that the HP EliteBook 645 G9 is a neither light nor heavy laptop for its size class.

Weight Comparison

Display size : 14.0-14.9 inches

HP EliteBook 645 G9
MIN
AVERAGE
MAX

Another value that we use for comparing the weights of the laptops here at Laptop Decision is the Weight per Inch of Screen, which is calculated by dividing the total weight of the model with its usable diagonal screen size. This value for the HP EliteBook 645 G9 is 0.10 kg/inch. Here are some of the best performing laptops in this area:

  • Asus Zenbook A14 UX3407: 0.06 kg/inch (Compare)
  • LG Gram 14 2022: 0.07 kg/inch (Compare)
  • LG Gram 14 2-in-1 2022: 0.07 kg/inch (Compare)
  • LG Gram 14 2023: 0.07 kg/inch (Compare)
  • Asus ExpertBook B9 OLED B9403: 0.07 kg/inch (Compare)


Body Thickness
Thickness of the HP EliteBook 645 G9 is 19.9 mm. Considering that average thickness of the laptops with display size '14.0-14.9 inches' in our database is 17.03 mm, it will be fair to say that the HP EliteBook 645 G9 is a bulky laptop for its class.

Thickness Comparison

Display size : 14.0-14.9 inches

HP EliteBook 645 G9
MIN
AVERAGE
MAX

Side Bezels and Screen-to-Body Ratio
The average Side Bezel Thickness of the HP EliteBook 645 G9 is 10.2 mm and the Screen to Body Ratio is 82.5%. These figures show that HP did a good job utilizing the surface area of this laptop even though there are laptops that are better in this regard.

Display

HP EliteBook 645 G9 comes with 3 different screen options which are listed below. Click on the options to see how the specs change for each model.

The option we are reviewing here is the 1366 x 768 option, and features a 14.0-inch sized TFT VA type display with 60 Hz refresh rate and 112 ppi pixel density.


Display Specifications
Display Resolution



Display Size 14 inches
Display Type TFT VA
Refresh Rate 60 Hz
PPI 112 ppi

If possible, we recommend the 1920 x 1080 version which offers crisper images, and lets you display more content on the screen when needed.

Pixel Density / PPI

Below is a chart depicting how 112 ppi pixel density of the HP EliteBook 645 G9 compares with the Min, Max and Average densities in its display size class (14.0-14.9 inches).

Screen PPI (Pixels Per Inch) Comparison

Display size : 14.0-14.9 inches

HP EliteBook 645 G9
MIN
AVERAGE
MAX


CPU

HP EliteBook 645 G9 has 3 different CPU configurations. The current setup we are reviewing is the AMD Ryzen 3 5425U.

AMD Ryzen 3 5425U is an AMD Ryzen 5000 series processor with Zen 3 architecture. While still capable, consider newer AI 300 series for better performance and features.

CPU Specifications
CPU Name



Base Frequency 2.7 GHz
Turbo Frequency 4.1 GHz
Number of Cores 4
Number of Threads 8
L3 Cache 8 MB
Integrated GPU AMD Radeon Vega 6 (Ryzen 4000)
CPU Fabrication Process 7 nm
Geekbench 5 (Single) 1316
Geekbench 5 (Multi) 4738

You may also read reviews of latest laptops with the same CPU ( AMD Ryzen 3 5425U ) and compare them:

  • Dell Inspiron 15 3525 AMD Compare
  • Lenovo ThinkPad L15 Gen 3 AMD Compare
  • Lenovo ThinkPad E14 Gen 4 AMD Compare
  • Lenovo ThinkBook 14 Gen 4 AMD Compare

GPU

HP EliteBook 645 G9-AMD Ryzen 3 5425U comes with only one GPU option which is AMD Radeon Vega 6 (Ryzen 4000). This is a Integrated type GPU with 1.23 TFLOPS floating point performance and its memory is system shared type. Integrated GPUs help to reduce the total cost and energy consumption compared to dedicated GPUs, however they are not the best options for graphic heavy applications such as video rendering and gaming.

** Since the GPU in HP EliteBook 645 G9 is integrated, the TGP value (15 W) is provided with considerable certainty, although there are varying opinions on its exact measurement.
GPU Specifications
GPU Name AMD Radeon Vega 6 (Ryzen 4000)
Base Clock Frequency 300 MHz
Boost Clock Frequency 1600 MHz
TGP (Total Graphics Power) 45 W
Type Integrated
FLOPS
Memory Size System Shared
Memory Type System Shared
Memory Bus System Shared
Memory Speed System Shared
Shading Units Cores 384
Texture Mapping Units / TMUs 24
Raster Operations Pipelines / ROPs 8
GPU Fabrication Process 7 nm


HP EliteBook 645 G9's 1.230 TFLOPS performance is quite low compared to best GPUs in its class. Below you can find the average and max TFLOPS level among the laptops with 14.0-14.9inch displays.

FLOPS Comparison

Display size : 14.0-14.9 inches

Average
Max

Here are some of the best performing laptops in this area:

  • HP ZBook Ultra 14 G1a with Radeon 8060S: 29.70 TFLOPS (Compare)
  • Acer Predator Helios Neo 14 AI PHN14-71 with GeForce RTX 5070 Laptop 8GB: 26.20 TFLOPS (Compare)
  • Razer Blade 14 2025 with GeForce RTX 5070 Laptop 8GB: 26.20 TFLOPS (Compare)
  • Acer Predator Triton 14 PT14-52 with GeForce RTX 5070 Laptop 8GB: 21.10 TFLOPS (Compare)
  • Apple MacBook Pro 14 M3, 2023 with : 20.40 TFLOPS (Compare)

RAM

HP EliteBook 645 G9 comes with 4 RAM options: 8GB, 16GB, 32GB and 64GB. The current setup we are reviewing is the 8GB.The RAM on the HP EliteBook 645 G9 is Upgradable (64 GB Max) which is a big plus, you can choose to purchase a version with lower RAM size and upgrade in the future if it becomes a necessity.HP EliteBook 645 G9 has the latest type of RAM existing in the market.DDR5 type RAMs provide speeds of at least 4800 MHz, whereas the previous generation supports a maximum of 3200 MHz.

RAM Specifications
RAM



Channels 1x8 GB
Clock 3200 MHz
Type DDR4 (latest: DDR5)
Upgradable Yes
Max Ram Size 64 GB
Total Slots 2
Bus PCI-E Gen 4.0 (4x)

LOCAL LLM Compatibility Evaluation

This quick guide shows what types of large language models (LLMs) this laptop could support, based on its hardware specifications. It's meant to help you decide whether it's suitable for running AI models locally.

Selected Configuration:
CPU/NPU: AMD Ryzen 3 5425U (No NPU)RAM: 8 GBGPU: Radeon RX Vega 6 (Ryzen 4000)
Small Models(1-3B):Examples: Phi-2, Qwen-1.8B
✔ Suitable
2B model with Q4 quantization (recommended): Requires ~2.5 GB memory - fits in your 8 GB RAM
Suitable, but iGPU typically falls in "Modest Speed" category
(See performance table below for details)
Medium Models(7-8B):Examples: Mistral-7B, Qwen-7B
✖ Not supported.
Large Models(13-30B):Examples: Llama 3 14B, Qwen1.5 14B, Dense 30B

Your system: 8 GB RAM. In practice, after the OS, iGPU, and background apps, only ~2 GB-3 GB is reliably available for models. With aggressive tuning and very few background apps, you might temporarily reach ~4 GB, but this is still not enough for 7-8B models in a stable way.

13-15B Models (e.g., Llama 3 14B, Qwen1.5 14B)
✖ Not Supported
14B with Q4 quantization (recommended): Requires ~10 GB memory - doesn't fit in your 8 GB RAM
14B Q3: ~8 GB - doesn't fit
Recommend 1-3B models or RAM upgrade.
16-24B Models (e.g., Dense 20B Q4 ~15.5GB)
✖ Not Supported
20B with Q4 quantization (recommended): Requires ~15.5 GB memory - doesn't fit in your 8 GB RAM
20B Q3: ~12.5 GB - doesn't fit
Recommend 1-3B models or RAM upgrade.
24-30B Models (e.g., Dense 30B Q4)
✖ Not Supported
30B with Q4 quantization (recommended): Requires ~21 GB memory - doesn't fit in your 8 GB RAM
30B Q3: ~17.5 GB - doesn't fit
Recommend 1-3B models or RAM upgrade.
MoE Models (Mixture-of-Experts) (e.g., Mixtral 8x7B - total ~47B, active ~12-13B)
✖ Not Supported
Mixtral 8x7B (≈47B total, ≈12–13B active) with Q4 quantization (recommended): Requires ~23 GB memory - doesn't fit in your 8 GB RAM
Mixtral 8x7B (≈47B total, ≈12–13B active) Q3: ~19.5 GB - doesn't fit
Recommend 1-3B models or RAM upgrade.

💡 Note: iGPU uses system RAM directly (unified memory). Expect "Modest Speed" performance (see table below).

Extra-Large Models(65B+):Examples: LLaMA2-70B, Qwen1.5-72B
✖ Not practical on most laptops (64GB+ workstation laptops may be exceptions).

Note: Optimized (e.g., 4-bit) models may run on limited hardware. Performance depends on runtime and setup.

📌 Model Types: Dense 30B Q4 models typically require around 19–22 GB of total memory, so they run best on systems with ≥24 GB unified memory. MoE models like Mixtral 8x7B (≈47B total parameters, usually ≈23–26 GB in 4-bit) also need high memory because all experts must be loaded, even though only a few are active per token. They reduce compute cost per token (similar to a ~12–13B dense model), but not memory usage, so they are not practical on 14–16 GB systems. Note: iGPU laptops use shared (unified) memory with lower bandwidth, making them more sensitive to memory pressure and offloading.

🚀 Modern NPU (Neural Processing Unit): Modern processors like AMD Ryzen AI and Intel Core Ultra feature NPU and unified memory architecture. NPUs provide modest performance gains (0-30% faster) with better power efficiency compared to iGPU-only execution. Real-world tests show ~3-10 tok/s range on 13B models with 32GB RAM (varies by runtime, quantization, and context), comparable to iGPU but more power-efficient. Note: These figures are examples from various NPU systems; actual performance depends on your specific hardware configuration.

Understanding Performance Categories

💡 Since this system uses iGPU, it typically falls in the "Modest Speed" range; more comfortable with short-medium context, expect noticeable slowdown with long context.

The performance descriptions use general categories because actual speed varies greatly based on your specific hardware, model optimization, context length, and runtime software.

Performance LevelTypical RangeUser Experience
Runs Smoothly
(High-end dGPU)
50+ tok/sReal-time response. Feels instant, like ChatGPT.
Runs Well
(Mid-range dGPU)
20-50 tok/sGood interactive performance. Slight delay, but usable.
Modest Speed
(iGPU/NPU/CPU)
5-20 tok/sUsable for tasks that don't need instant responses. Noticeable typing delay.
Borderline / Slow
(Limited hardware)
2-5 tok/sVery slow. Patience required. Better for batch processing.
Not Practical<2 tok/sToo slow for regular use. May cause system hangs or instability.

💡 Tip: Your actual results may be higher or lower than these ranges. Test with your specific hardware to know for sure!

⚠️ Note: Performance categorization is based on how much total memory is available for the model (unified RAM) and whether it needs to spill into slower storage. GPU type (memory bandwidth, compute power) can also affect actual performance. Currently, we prioritize whether the model fits in available unified memory for classification. We may refine this categorization in future updates based on more detailed benchmarks.

BATTERY

HP EliteBook 645 G9's Li-Po battery has a capacity of 42.7 Wh is under average, which may cause lack of mobility. Please note that even though the battery capacity gives you an idea about potential battery life, it is not the only indicator of unplugged run time of the laptop, but impacted also by factors such as your laptop's configuration, screen brightness and number & types of apps that you are running simultaneously.

Battery Comparison

Display size : 14.0-14.9 inches

HP EliteBook 645 G9
MIN
AVERAGE
MAX

Battery Specifications
Capacity

Battery Type Li-Po
Replaceable No
Fast Charging Yes
USB Power Delivery Yes
Charging Port Position Left
Charge Power 45 / 65 W
Cable Length 1 meters

  • HP EliteBook 645 G9's battery is not replaceable but we can't hold it against this model as this has been the general trend in the laptop world for a long time.
  • HP EliteBook 645 G9 supports fast charging which lets the user charge the laptop in a shorter time than normal.

STORAGE

HP EliteBook 645 G9 comes at least with a SSD (M2) type 1x128 GB storage as standard. More storage is always good, but it comes with a price.Fortunately, the storage on the HP EliteBook 645 G9 is Upgradable so you can upgrade it with a larger storage when needed.The NVMe SSD used in the HP EliteBook 645 G9 can achieve up to 3.5 GB/s speed whereas older SATA SSDs could only reach speeds of up to 550 MB/s.

Storage Specifications
Storage Up To 1 TB
Upgradable Yes
Total Slots 2
Type SSD (M2)
NVMe Yes

SOUND

Good quality speakers can have a significant impact on the overall experience when using laptops, especially if you are consuming a lot of multimedia material such as music or videos. The HP EliteBook 645 G9 features a 2.0 speaker set up.

Sound Specifications
Speakers Setup 2.0
Dolby Atmos No
Microphones 2

The number and quality of the built-in microphones are as important especially in this age of online meetings and streaming.

CONNECTIVITY and PORTS

HP EliteBook 645 G9 has the Wifi Standard (v6E) which provides nearly (theoretical 9.6 Gbps - 1200 MB/s, real world up to 5 Gbps - 625 MB/s) speed, which is 25% better than V6.
On the other hand, the latest WiFi v7 standard supports 40 GB/s and provides speeds up to 2.4 times faster than the previous v6 setup. Laptops with WiFi v7 appeared in the market as of the end of 2023.

The Bluetooth Standard of the HP EliteBook 645 G9 is v5.3, which is not the latest generation.As the version number increases within the Bluetooth V5.x series, sub-generations also progress. Although the range and speeds remain consistent, advancements in energy efficiency, reliability, and security features are introduced in subsequent sub-generations.

Connectivity
WiFi Standard v6E (latest: v7)
Bluetooth v5.3 (latest: v5.4)
Fingerprint Sensor Optional
Optical Drive No

Below, you'll find a Wi-Fi Versions Table, along with their release dates and speeds, to provide a brief overview of its development.

Wi-Fi Versions and Speeds
Standard Speed Release
Date
Network Frequency
Bands (GHz)
Wi-Fi 7 up to 40 Gbps
(5 GB/s)
2023 802.11be 2.4, 5, 6
Wi-Fi 6E up to 9.6 Gbps
(1.2 GB/s)
2020 802.11ax 2.4, 5, 6
Wi-Fi 6 up to 9.6 Gbps
(1.2 GB/s)
2019 802.11ax 2.4, 5
Wi-Fi 5 up to 6.93 Gbps
(866.25 MB/s)
2014 802.11ac 2.4, 5
Wi-Fi 4 up to 600 Mbps
(75 MB/s)
2009 802.11n 2.4, 5
* Please note that the provided transfer rates are maximum theoretical values, and real-life performance may vary based on environmental factors.

Below, you'll find a comparison table detailing Bluetooth versions since 2010, including their features, speed, range, IoT support, and release years. This information can be helpful in understanding the evolution of Bluetooth technology and its capabilities over the years.

Bluetooth Versions and Features Since 2010
Version Speed
(Mbps)
Range
(Open Area)
Year Features IoT
Support
v5.4 2 200 m 2023 PAwR, advanced security Yes
v5.3 2 200 m 2021 Connection and security enhancements Yes
v5.2 2 200 m 2020 LE Audio, efficiency and communication quality Yes
v5.1 2 200 m 2019 Precise device positioning Yes
v5.0 2 200 m 2016 Extended range and speed Yes
v4.2 1 100 m 2014 Internet connectivity, security improvements Yes
v4.1 1 100 m 2013 Improved device connectivity Yes
v4.0 1 100 m 2010 Low Energy mode Yes

* Please note that in the Bluetooth 5.x series, there hasn't been a significant increase in range and data speed. However, each new version has brought significant technological improvements in areas such as security, energy efficiency, and IoT support.

HP EliteBook 645 G9 equipped with 3x USB 3.2 USB-A ports and 1x USB 4.0 Type-C ports.

USB-A ports of the 'HP EliteBook 645 G9 are the latest generation. The maximum speed of USB-A 3.2 (latest generation) port is 20 GB/s.

USB-TypeC ports of the HP EliteBook 645 G9 are not the latest generation. The latest generation USB4 2.0 provides 80 and 120 Gbit/s speeds.

HP EliteBook 645 G9 has the latest generation HDMI connection.HDMI 2.1, the latest version since 2017, offers significant upgrades such as support for up to 10K at 120 Hz, Dynamic HDR, and Enhanced Audio Return Channel (eARC). Compared to HDMI 2.0's maximum 18.0 Gbit/s bandwidth, HDMI 2.1 provides increased bandwidth for more advanced features, surpassing its predecessor.

Ports
USB-A 3x USB 3.2 (latest)
USB Type-C 1x USB 4.0 (latest: USB4 2.0)
Thunderbolt No
HDMI 1x HDMI 2.1 (latest)
Display Port No
VGA No
Audio Jack 3.5mm Yes
Ethernet RJ45 Yes
SD CardReader No
Proprietary Charging Port Yes

Below, you'll find a table of USB ports, along with their release dates and speeds.
To mitigate the confusion caused by generation names, the USB Implementers Forum (USB-IF) suggests using marketing names like USB 5Gbps, USB 10Gbps, and so forth, based on their respective transfer rates.

USB Type and Speeds
USB Type Version Speed Date Other Features/Explanations
USB4 Gen 4 (2.0) 80 Gbps 2022 Also known as USB 80Gbps
USB4 Gen 3×2 40 Gbps 2019 Also known as USB 40Gbps
USB 3.2 3.2 Gen 2x2 20 Gbps 2019 Double the data transfer rates of Gen 2
USB 3.2 3.2 Gen 2 10 Gbps 2017 Previously known as USB 3.1
USB 3.2 3.2 Gen 1 5 Gbps 2017 Previously known as USB 3.0
USB 3.1 3.1 Gen 2 10 Gbps 2013 Faster data transfer rates
USB 3.0 3.1 Gen 1 5 Gbps 2010 SuperSpeed USB, improved data transfer rates
USB 2.0 2.0 480 Mbps 2000 High-speed data transfer
USB 1.0 1.0 1.5 Mbps 1996 Original USB standard

Below, you'll find a comparison table detailing different HDMI versions, including their bandwidth, color depth, maximum resolution, and release dates. This information can be helpful in understanding the capabilities of each HDMI version and choosing the most suitable one for your needs.

HDMI Comparison Table
HDMI Version Maximum Resolution Bandwidth
(Gbps)
Color Depth
(bits)
Release
Date
HDMI 2.1-2.1b 7680 x 4320 (8K) @ 60p
3840 x 2160 (4K) @ 120p
48.0 48 2017
HDMI 2.0-2.0b 3840 x 2160 (4K) @ 60p 18.0 48 2013
HDMI 1.4-1.4b 3840 x 2160 (4K) @ 30p 10.2 48 2009
HDMI 1.3-1.3a 2560 x 1440 @ 60p 10.2 48 2006
HDMI 1.0-1.2a 1920 x 1200 @ 60p 4.95 24 2002
* Please note that the provided resolution values represent the maximum supported resolution, and actual display quality may depend on other factors such as source content and connected devices.

WEBCAM

HP EliteBook 645 G9 has 0.92 MP front camera resulting poor quality for video conferencing.

Webcamera Specs
Webcam 1280 x 720
Webcam Resolution 1280 x 720
0.92 MP

KEYBOARD and TOUCHPAD

HP EliteBook 645 G9 has Island type keyboard, which is used on majority of recent laptops.

Keyboard and Touchpad
Keyboard Type Island
Numpad No
Backlight Yes
Touchpad Size 11.5 x 6.5 cm
Touchpad Area 74.8 cm2
Touchpad Surface Material Plastic
Windows Precision Yes
Report a correction

Most Popular Alternatives to HP EliteBook 645 G9

Here are the 8 laptops that our readers compare the most with the HP EliteBook 645 G9:

Model Release Date Screen Size Weight
HP EliteBook 845 G9
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January 2022 14.0" 1.4 kg (3.09 lbs)
HP EliteBook 645 G10
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March 2023 14.0" 1.4 kg (3.09 lbs)
HP EliteBook 845 G11
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HP EliteBook 650 G9
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January 2022 15.6" 1.74 kg (3.84 lbs)
HP EliteBook 640 G11
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March 2024 14.0" 1.39 kg (3.06 lbs)
HP EliteBook 840 G10
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May 2023 14.0" 1.36 kg (3 lbs)
HP ZBook Firefly 14 G10
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May 2023 14.0" 1.45 kg (3.2 lbs)