HP EliteBook 645 G9 vs HP EliteBook 845 G9 Comparison

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HP EliteBook 645 G9

14 inches | January 2022

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HP EliteBook 845 G9

14 inches | January 2022

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HP EliteBook 645 G9 vs HP EliteBook 845 G9 Comparison Overview

HP EliteBook 645 G9

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HP EliteBook 845 G9

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HP EliteBook 645 G9

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HP EliteBook 845 G9

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In this review, we will be comparing EliteBook 645 G9 and EliteBook 845 G9, two laptops by HP. HP EliteBook 645 G9 was introduced to market in January 2022 and HP EliteBook 845 G9 was launched in January 2022. Both EliteBook 645 G9 and EliteBook 845 G9 were launched within the same month so we are expecting this to be a fair comparison regarding age and available technology level.

Click for Available Configurations of the Laptops

EliteBook 645 G9 and EliteBook 845 G9 are members of HP's EliteBook series of laptops. Below you can find the latest models from this series.

HP EliteBook Series History

	Release Date	Screen Size	Dimensions	Weight
HP EliteBook Ultra 14 G1i	January 2025	14.0"	313.7 x 217.2 x 0.9-12.1 mm	1.19 kg (2.62 lbs)
HP EliteBook X G1a	September 2024	14.0"	312.2 x 214.75 x 8.98-13.17 mm	1.49 kg (3.29 lbs)
HP EliteBook Ultra 14	May 2024	14.0"	312.9 x 223.5 x 8.5-14.4 mm	1.34 kg (2.95 lbs)
HP Elitebook 1040 G11	April 2024	14.0"	313.9 x 219.9 x 14.9 mm	1.18 kg (2.6 lbs)
HP EliteBook 860 G11	March 2024	16.0"	358.7 x 251.2 x 16.1 mm	1.71 kg (3.77 lbs)
HP EliteBook 830 G11	March 2024	13.3"	300.1 x 215 x 15.9 mm	1.23 kg (2.71 lbs)
HP EliteBook 630 G11	March 2024	13.3"	303.1 x 215.1 x 10.9 mm	1.29 kg (2.84 lbs)
HP EliteBook 840 G11	March 2024	14.0"	315.6 x 224.3 x 16.1 mm	1.41 kg (3.11 lbs)

Here is a brief look at the main features of HP EliteBook 645 G9 and HP EliteBook 845 G9 before getting into our more detailed comparison.

HP EliteBook 645 G9 Key Specs

Launched in January 2022
14.0" TFT VA, 16:10 Aspect Ratio Display
CPU: AMD Ryzen 3 5425U
GPU: Radeon RX Vega 6 (Ryzen 4000)
8GB Ram
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)

HP EliteBook 845 G9 Key Specs

Launched in January 2022
14.0" IPS LCD, 16:10 Aspect Ratio Display
CPU: AMD Ryzen 7 6800Uâ€‹
GPU: Radeon 680M
8GB Ram
315.6 x 224 x 19.2 mm (12.43 x 8.82 x 0.76 inches)
Weight: 1.4 kg (3.09 lbs)

HP EliteBook 645 G9 was replaced by hp-elitebook-645-g10. You may also be interested in these comparisons:
hp-elitebook-645-g10 vs HP EliteBook 645 G9
hp-elitebook-645-g10 vs HP EliteBook 845 G9

Let's read on the following sections in order to better understand in detail how EliteBook 645 G9 and EliteBook 845 G9 compares and decide which one is better for you.

**This post contains affiliate links and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Reasons to choose HP EliteBook 645 G9 over HP EliteBook 845 G9

Weight	1.37 kg vs 1.40 kg	0.03 kg lighter
Screen-to-Body Ratio	~82.5% vs ~80.4%	Larger screen area ratio
Noise Level	32 dB vs 44 dB	Less fan noise
Bluetooth	v5.3 vs v5.2	More advanced Bluetooth connectivity
Number of USB-A Ports	3x USB 3.2 vs 2x USB 3.2	Connect more device at the same time
HDMI Version	2.1 vs 2.0	Better HDMI connectivity
Ethernet RJ45 Port	Yes vs No	Connects to the local network via Ethernet RJ45

Reasons to choose HP EliteBook 845 G9 over HP EliteBook 645 G9

Side Bezel Thickness	7.1 mm vs 10.2 mm	3.1 mm thinner bezels
Screen PPI	162 ppi vs 112 ppi	More pixels per inch
Screen Resolution	1920 x 1200 pixels vs 1366 x 768 pixels	Higher pixel count screen
Max Brightness	1000 nits vs 250 nits	Brighter Screen
CPU Fabrication Process	6 nm vs 7 nm	Newer Generation CPU
GPU FLOPS	3.686 TFLOPS vs 1.23 TFLOPS	Faster RAM Type
RAM Type	DDR5 vs DDR4	Higher Resolution Camera
Webcam Resolution	2560 x 1440 vs 1280 x 720	Connect more device at the same time
Number of USB-C Ports	2x USB 4.0 vs 1x USB 4.0

Common Strengths of HP EliteBook 845 G9 and HP EliteBook 645 G9

Launch Dates	January 2022 vs January 2022	Both laptops are recent models
Screen Coating	Matte vs Matte	Less reflections on the screen
Fast Charging Support	Yes vs Yes	Charge the battery in a shorter time
USB Power Delivery	Yes vs Yes	Charging via USB port gives flexibility
Upgradable RAM	Yes vs Yes	Option to increase the RAM size
RAM Type	PCI-E Gen 4.0 (4x) vs PCI-E Gen 4.0 (4x)	Fast RAM type
Upgradable Storage	Yes vs Yes	Option to increase the Storage size
SSD Type	NVMe vs NVMe	Faster Data Transfers
Wi-Fi Standard	v6E vs v6E	Fast and Reliable Wi-Fi Connections
HDMI Output	1x HDMI 2.1 vs 1x HDMI 2.1	Connect to External Displays via HDMI cable
VGA Output	No vs No	Connect to External Displays via VGA cable
Keyboard Backlight	Yes vs Yes	Easily see the keys under low light

Common Weaknesses of HP EliteBook 845 G9 and HP EliteBook 645 G9

Touchscreen Capability	No vs No	No Touchscreen Capability

HP EliteBook 645 G9 vs HP EliteBook 845 G9: Physical Specs Comparison

In this section, we will be comparing the physical specifications and body features of the HP EliteBook 645 G9 and the HP EliteBook 845 G9.

Physical Specs
Weight	1.37 kg (3.02 lbs)	1.4 kg (3.09 lbs)
Surface Area	689 cm2 (106.7 inches2)	707 cm2 (109.6 inches2)
Screen to Surface Ratio	~82.5%	~80.4%
Side Bezel Thickness	~10.2 mm	~7.1 mm
Weight per Inch of Screen	0.10 kg/inch	0.10 kg/inch
	0.22 lbs/inch	0.22 lbs/inch
Colors	Silver	Silver
Cover Opening Angle	180Â°	180Â°

Comparison of the HP EliteBook 645 G9 and the HP EliteBook 845 G9 External Dimensions

Weight

EliteBook 645 G9 weighs 1.37 kg (3.02 lbs), whereas the EliteBook 845 G9 weighs 1.4 kg (3.09 lbs). There is a notable difference in weight between these two laptops. The weight difference between the two laptops is not significant.

Weight Comparison

Displays size 14.0-14.9 inches

HP EliteBook 645 G9 1.37 kg

HP EliteBook 845 G9 1.40 kg

Min 0.88 kg

Average 1.42 kg

Max 2.19 kg

Thickness Comparison

Displays size 14.0-14.9 inches

HP EliteBook 645 G9 19.90 mm

HP EliteBook 845 G9 19.20 mm

Min 8.40 mm

Average 17.12 mm

Max 32.50 mm

Another value that we use for comparing the weights of the laptops 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.In comparison, this value for the HP EliteBook 845 G9 is 0.10 kg/inch.Here are some of the best performing laptops in this area:

Microsoft Surface Go 4: 0.05 kg/inch
LG Gram SuperSlim 15.6 2023: 0.06 kg/inch
Asus ProArt PZ13 HT5306: 0.06 kg/inch
Asus Zenbook A14 UX3407: 0.06 kg/inch
Dell Latitude 7330: 0.07 kg/inch
Lenovo ThinkPad X1 Nano Gen 2: 0.07 kg/inch
LG Gram 14 2022: 0.07 kg/inch
LG Gram 14 2-in-1 2022: 0.07 kg/inch

HP EliteBook 645 G9 vs HP EliteBook 845 G9: Internals (CPU, GPU, RAM, Battery, SSD, etc.) Comparison

CPU Comparison

CPU Model	AMD Ryzen 3 5425U AMD Ryzen 5 5625U AMD Ryzen 7 5825U	AMD Ryzen 7 6800Uâ€‹ AMD Ryzen 7 Pro 6850U
Base Frequency	2.7 GHz	2.7 GHz
Turbo Frequency	4.1 GHz	4.7 GHz
Number of Cores	4	8
Number of Threads	8	16
L3 Cache	8 MB	16 MB
Integrated GPU	AMD Radeon Vega 6 (Ryzen 4000)	AMD Radeon 680M
CPU Fabrication Process	7 nm	6 nm

Above you can see the CPU options and the CineBench and GeekBench test scores for both laptops, which gives an idea about what kind of performance difference you may experience between the HP EliteBook 645 G9 and HP EliteBook 845 G9.

You may also read reviews of latest laptops with the same CPUs and compare them:

Laptops with: AMD Ryzen 3 5425U

Laptops with: AMD Ryzen 7 6800Uâ€‹

GPU Comparison

GPU Model	Radeon RX Vega 6 (Ryzen 4000)	Radeon 680M
Base Clock Frequency	300 MHz	2000 MHz
Boost CLock Frequency	1600 MHz	2200 MHz
TGP (Total Graphics Power)	45 W	50 W
Type	Integrated	Integrated
FLOPS	1,229 GFLOPS	3.379 TFLOPS
Memory Size	System Shared	System Shared
Memory Type	System Shared	System Shared
Memory Bus	System Shared	System Shared
Memory Speed	System Shared	System Shared
Shading Units Cores	384	768
TMUs	24	48
ROPs	8	32

GPU is as critical as the CPU for graphic heavy applications and the table above gives a picture of how the two GPU compares. FLOPS is a measure of a GPU's performance based on the number of floating-point arithmetic calculations that the processor can perform within a second. HP EliteBook 645 G9 has a FLOPS value of 1.23 TFLOPS whereas the HP EliteBook 845 G9 ' has a FLOPS value of 3.686 TFLOPS. If graphical performance of the laptop is important for your use type, the HP EliteBook 845 G9 may be the better choice between these two setups.

RAM Comparison

RAM	8GB 16GB 32GB 64GB	8GB 16GB 32GB 64GB
Memory Bus	1x8 GB	1x8 GB
RAM Clock	3200 MHz	4800 MHz
RAM Type	DDR4	DDR5
Upgradable	Yes	Yes
Max RAM Size	64 GB	64 GB
Total Slots	2	2
Memory Bus	PCI-E Gen 4.0 (4x)	PCI-E Gen 4.0 (4x)

Both laptops, the EliteBook 645 G9 and the EliteBook 845 G9, come with similar RAM capacities of 8 GB, providing comparable performance in memory-intensive tasks.

LOCAL LLM Compatibility Evaluation

This quick guide shows what types of large language models (LLMs) each of these laptops could support, based on their respective hardware specifications. It's meant to help you compare their suitability for running AI models locally.

HP EliteBook 645 G9

HP EliteBook 845 G9

Small Models(1-3B):Examples: Phi-2, Qwen-1.8B

✔Run smoothly.

Medium Models(7-8B):Examples: Mistral-7B, Qwen-7B

✖Not supported.

Large Models(13-30B):Examples: Mixtral, Qwen-14B

✖Not supported.

Extra-Large Models(65B+):Examples: LLaMA2-70B, Qwen1.5-72B

✖Not supported on most systems. Requires high-end GPU or advanced setup.

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

In addition to RAM capacity, the type of RAM can significantly impact performance, with newer RAM types often offering higher speeds compared to others. Therefore, selecting RAM types with the latest DDR number can be a suitable choice based on your requirements.

BATTERY

BATTERY	42.7 Wh 51.3 Wh	51 Wh
Battery Type	Li-Po	Li-Ion
Replaceable	No	No
Fast Charging	Yes	Yes
USB Power Delivery	Yes	Yes
Charging Port Position	Left	Left
Charge Power	45 / 65 W	45 / 65 W
Cable Length	1 meters	1 meters

On the other hand, the EliteBook 845 G9 features a higher battery capacity of 51 Wh, delivering longer usage time compared to the EliteBook 645 G9's 43 Wh.

Battery Comparison

Displays size 14.0-14.9 inches

HP EliteBook 645 G9 43 Wh

HP EliteBook 845 G9 51 Wh

Min 32.00 Wh

Average 55.79 Wh

Max 90.00 Wh

STORAGE
The EliteBook 845 G9 offers a larger max storage capacity of 2 TB, providing more room for storing files and data compared to the EliteBook 645 G9's storage capacity of 1 TB.

Storage Options	128 GB, 256 GB, 512 GB, 1 TB	256 GB, 512 GB, 1 TB, 2 TB
Upgradable	Yes	Yes
Total Slots	2	1
Storage type	SSD (M2)	SSD (M2)
NVMe	Yes	Yes

If your budget allows, we recommend opting for the largest possible disk size, considering the potential increase in storage capacity needs in the future. However, please keep in mind the question 'What will the laptop be used for?' when making this decision. Of course, you can later upgrade the hard disk capacity by getting a larger disk. However, if your laptop has only one disk slot, it may not be as straightforward as a RAM upgrade, where you simply add or replace a module, as moving or cloning files to a new disk may be necessary.

HP EliteBook 645 G9 vs HP EliteBook 845 G9: Display Comparison

The display is an essential aspect to consider when comparing the HP EliteBook 645 G9 and HP EliteBook 845 G9 since its is the component that you interact the most and significantly impact the experience.

Screen Area and Dimensions

Now let's look at the comparison of the actual display areas of both laptops below, keeping the bezels around the screens out of the equation. Both EliteBook 645 G9 and EliteBook 845 G9 screens have the same size of 14.0".The total usable screen area of the EliteBook 645 G9 is 568cm² / 88inch² whereas the EliteBook 845 G9's total usable screen area is 568cm² / 88inch².

PPI (Pixels per Inch)
Additionally, the EliteBook 845 G9 features a higher pixel density with 162 pixels per inch (PPI), ensuring sharper image details.

Screen PPI (Pixels Per Inch) Comparison

Displays size 14.0-14.9 inches

HP EliteBook 645 G9 112 ppi

HP EliteBook 845 G9 162 ppi

Min 112 PPI

Average 173 PPI

Max 323.00 PPI

Refresh Rate
Both EliteBook 645 G9 and EliteBook 845 G9 offer the same refresh rate of 60 Hz.

Brightness
The EliteBook 845 G9 offers a higher maximum brightness of 1000 nits, delivering a brighter screen.

Brightness Comparison

Displays size 14.0-14.9 inches

HP EliteBook 645 G9 250 nits

HP EliteBook 845 G9 1000 nits

Min

200 nits

Average 383 nits

Max 1200.00 nits

HP EliteBook 645 G9 vs HP EliteBook 845 G9 Connectivity Comparison

In terms of connectivity,

Wifi
Both laptops offer the same Wi-Fi standard (v6E), ensuring fast and reliable wireless connections.

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.

USB
Both EliteBook 645 G9 and EliteBook 845 G9 have USB-A ports. EliteBook 645 G9 has 3x USB 3.2 USB-A ports, while EliteBook 845 G9 has 2x USB 3.2 USB-A ports.
Both EliteBook 645 G9 and EliteBook 845 G9 have USB Type-C ports. EliteBook 645 G9 has 1x USB 4.0 USB Type-C ports, while EliteBook 845 G9 has 2x USB 4.0 USB Type-C ports.

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

Thunderbolt
Neither EliteBook 645 G9 nor EliteBook 845 G9 has Thunderbolt port.

HDMI
Both EliteBook 645 G9 and EliteBook 845 G9 feature an HDMI port. EliteBook 645 G9 offers 1x HDMI 2.1, while EliteBook 845 G9 offers 1x HDMI 2.0.

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.

SD Card Reader
Neither EliteBook 645 G9 nor EliteBook 845 G9 has an SD Card Reader.

Audio Jack
Both EliteBook 645 G9 and EliteBook 845 G9 are equipped with a 3.5mm Audio Jack, providing seamless connection to headphones and speakers.

To summarize the connectivity and ports details, please refer to the table below to see them listed.

Connectivity and Ports
WiFi Standard (latest: v7)	v6E	v6E
Bluetooth (latest: v5.4)	v5.3	v5.2
USB-A (latest: 3.2)	3x USB 3.2	2x USB 3.2
USB Type-C (latest: USB4 2.0)	1x USB 4.0	2x USB 4.0
Thunderbolt (latest: 4)	No	No
HDMI (latest: 2.1)	1x HDMI 2.1	1x HDMI 2.0
Display Port (latest: v2.0)	No	No
VGA	No	No
Fingerprint Sensor	Optional	Optional
Optical Drive	No	No
Audio Jack 3.5mm	Yes	Yes
Ethernet RJ45	Yes	No
SD CardReader	No	No
Proprietary Charging Port	Yes	No