Lenovo Legion 9i Gen 10 2025 vs Infinix Zero Book Ultra Comparison

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Lenovo Legion 9i Gen 10 2025

18 inches | May 2025

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Infinix Zero Book Ultra

15.6 inches | July 2024

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Lenovo Legion 9i Gen 10 2025 vs Infinix Zero Book Ultra Comparison Overview

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In this review, we will be comparing Legion 9i Gen 10 2025 and Zero Book Ultra, two laptops from Lenovo and Infinix. Lenovo Legion 9i Gen 10 2025 was introduced to market in May 2025 and Infinix Zero Book Ultra was launched in July 2024. There is only 10 months difference between Legion 9i Gen 10 2025 and Zero Book Ultra so we are expecting this to be a fair comparison regarding age and technology level.

Click for Available Configurations of the Laptops

Legion 9i Gen 10 2025 and Zero Book Ultra are members of Infinix's series of laptops. Below you can find the latest models from this series.

Lenovo Series History

	Release Date	Screen Size	Dimensions	Weight
Lenovo ThinkPad T1g Gen 8	September 2025	16.0"	354.3 x 241 x 9.9-15.8 mm	1.84 kg (4.06 lbs)
Lenovo ThinkPad P1 Gen 8	September 2025	16.0"	354.3 x 241 x 9.87-15.8 mm	1.84 kg (4.06 lbs)
Lenovo ThinkPad P14s Gen 6 Intel	September 2025	14.0"	325.5 x 227.6 x 11.2-15.1 mm	1.6 kg (3.53 lbs)
Lenovo ThinkPad P16s Gen 4 Intel	September 2025	16.0"	361.5 x 248.6 x 12.6-18.17 mm	1.82 kg (4.01 lbs)
Lenovo ThinkPad P16v Gen 3	September 2025	16.0"	361.5 x 248.6 x 12.8-19.55 mm	2.1 kg (4.63 lbs)
Lenovo ThinkPad X13 Gen 6	May 2025	13.3"	299.3 x 207 x 9.85-17.75 mm	0.92 kg (2.03 lbs)
Lenovo Legion 9i Gen 10 2025	May 2025	18.0"	403 x 296.5 x 23.9-27.95 mm	3.5 kg (7.72 lbs)
Lenovo Thinkpad P14s Gen 6	April 2025	14.0"	315.9 x 223.7 x 10.9-16.3 mm	1.39 kg (3.06 lbs)

Here is a brief look at the main features of Lenovo Legion 9i Gen 10 2025 and Infinix Zero Book Ultra before getting into our more detailed comparison.

Lenovo Legion 9i Gen 10 2025 Key Specs

Launched in May 2025
18.0" Mini LED, 16:10 Aspect Ratio Display
CPU: Intel Core Ultra 9 275HX
GPU: GeForce RTX 5080 Laptop 16GB,GeForce RTX 5090 Laptop 24GB
32GB,64GB,128GB,192GB Ram
403 x 296.5 x 23.9-27.95 mm (15.87 x 11.67 x 0.94-1.1 inches)
Weight: 3.5 kg (7.72 lbs)

Infinix Zero Book Ultra Key Specs

Launched in July 2024
15.6" IPS LCD, 16:9 Aspect Ratio Display
CPU: Intel Core Ultra 5 125H
GPU: Intel Arc iGPU (7-Cores)
16GB Ram
360.3 x 237 x 16.95 mm (14.19 x 9.33 x 0.67 inches)
Weight: 1.8 kg (3.97 lbs)

Let's read on the following sections in order to better understand in detail how Legion 9i Gen 10 2025 and Zero Book Ultra 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 Lenovo Legion 9i Gen 10 2025 over Infinix Zero Book Ultra

Display Size	18 inches vs 15.6 inches	Larger Screen Estate
Refresh Rate	240 Hz vs 60 Hz	Smoother media experience
Screen PPI	252 ppi vs 141 ppi	More pixels per inch
Screen Resolution	3840 x 2400 pixels vs 1920 x 1080 pixels	Higher pixel count screen
Max Brightness	520 nits vs 400 nits	Brighter Screen
CPU Fabrication Process	3 nm vs 7 nm	Newer Generation CPU
GPU Fabrication Process	4 nm vs 5 nm	Newer Generation GPU
GPU FLOPS	42 TFLOPS vs 3.9 TFLOPS	Dedicated GPU unit
GPU Type	Dedicated vs Integrated	More RAM Options
Upgradable RAM	Yes vs No	More advanced Wi-fi connectivity
WiFi Standard	v7 vs v6E	More advanced Bluetooth connectivity
Bluetooth	v5.4 vs v5.3	Connect more device at the same time
Number of USB-A Ports	3x USB 3.2 vs 2x USB 3.2	Connect more device at the same time
Number of USB-C Ports	3x USB 4.0 vs 2x USB 3.2	Faster USB-C connection
USB-C Port Type	v4.0 vs v3.2	Support audio, data, power and video all through one single port
Thunderbolt	v5 vs No	Better HDMI connectivity
HDMI Version	2.1 vs 2.0	Connects to the local network via Ethernet RJ45
Ethernet RJ45 Port	Yes vs No	Fast way to input numbers
Numeric Pad	Yes vs No

Reasons to choose Infinix Zero Book Ultra over Lenovo Legion 9i Gen 10 2025

Weight	1.80 kg vs 3.50 kg	1.7 kg lighter
Side Bezel Thickness	7.5 mm vs 7.7 mm	0.2 mm thinner bezels
Screen Type	Matte vs Glossy	potentially less reflections on screen
Fingerprint Sensor	Yes vs No	Easy login with fingerprint

Common Strengths of Infinix Zero Book Ultra and Lenovo Legion 9i Gen 10 2025

Launch Dates	May 2025 vs July 2024	Both laptops are recent models
Fast Charging Support	Yes vs Yes	Charge the battery in a shorter time
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
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
Built-in SD Card Reader	Yes vs Yes	Read & Write SD Cards
Keyboard Backlight	Yes vs Yes	Easily see the keys under low light

Common Weaknesses of Infinix Zero Book Ultra and Lenovo Legion 9i Gen 10 2025

Touchscreen Capability	No vs No	No Touchscreen Capability

Lenovo Legion 9i Gen 10 2025 vs Infinix Zero Book Ultra: Physical Specs Comparison

In this section, we will be comparing the physical specifications and body features of the Lenovo Legion 9i Gen 10 2025 and the Infinix Zero Book Ultra.

Physical Specs
Weight	3.5 kg (7.72 lbs)	1.8 kg (3.97 lbs)
Surface Area	1195 cm2 (185.2 inches2)	854 cm2 (132.4 inches2)
Screen to Surface Ratio	~78.6%	~78.6%
Side Bezel Thickness	~7.7 mm	~7.5 mm
Weight per Inch of Screen	0.19 kg/inch	0.12 kg/inch
	0.418 lbs/inch	0.264 lbs/inch
Colors	Black	Gray

Comparison of the Lenovo Legion 9i Gen 10 2025 and the Infinix Zero Book Ultra External Dimensions

Weight

Legion 9i Gen 10 2025 weighs 3.5 kg (7.72 lbs), whereas the Zero Book Ultra weighs 1.8 kg (3.97 lbs). There is a notable difference in weight between these two laptops. However, it's important to consider that comparing their weights directly may not provide a complete picture since they also have different display sizes.

Weight Comparison

Lenovo Legion 9i Gen 10 2025

Avg: larger than 17.0"

Infinix Zero Book Ultra

Avg: 15.0-15.9"

Thickness Comparison

Lenovo Legion 9i Gen 10 2025

Avg: larger than 17.0"

Infinix Zero Book Ultra

Avg: 15.0-15.9"

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 Lenovo Legion 9i Gen 10 2025 is 0.19 kg/inch.In comparison, this value for the Infinix Zero Book Ultra is 0.12 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
Microsoft Surface Pro 12: 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

Lenovo Legion 9i Gen 10 2025 vs Infinix Zero Book Ultra: Internals (CPU, GPU, RAM, Battery, SSD, etc.) Comparison

CPU Comparison

CPU Model	Intel Core Ultra 9 275HX	Intel Core Ultra 5 125H Intel Core Ultra 7 155H
Base Frequency	2.7 GHz	1.2 GHz
Turbo Frequency	5.4 GHz	4.5 GHz
Number of Cores	24 (8P + 16E)	Arc Graphics (7-
Number of Threads	24	18
L3 Cache	36 MB	18 MB
Integrated GPU	Arc Graphics (4-Cores)	Arc Graphics (7-Cores)
CPU Fabrication Process	3 nm	7 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 Lenovo Legion 9i Gen 10 2025 and Infinix Zero Book Ultra.

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

Laptops with: Intel Core Ultra 9 275HX

Laptops with: Intel Core Ultra 5 125H

GPU Comparison

GPU Model	GeForce RTX 5080 Laptop 16GB GeForce RTX 5090 Laptop 24GB	Intel Arc iGPU (7-Cores)
Base Clock Frequency	975 MHz	300 MHz
TGP (Total Graphics Power)	175 W	28 W
Nvidia Optimus	MUX
Type	Dedicated	Integrated
FLOPS	42 TFLOPS	3.9 TFLOPS
Memory Size	16 GB	System Shared
Memory Type	GDDR7	LPDDR5X
Memory Bus	256 bit
Memory Speed	~28 Gbps	7.47 Gbps
Shading Units Cores	7680	896
TMUs	240	56
ROPs	96	24

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. Lenovo Legion 9i Gen 10 2025 has a FLOPS value of 42 TFLOPS whereas the Infinix Zero Book Ultra ' has a FLOPS value of 3.9 TFLOPS. If graphical performance of the laptop is important for your use type, the Lenovo Legion 9i Gen 10 2025 may be the better choice between these two setups.

RAM Comparison

RAM	32GB 64GB 128GB 192GB	16GB 32GB
Memory Bus	2x16 GB	2x8 GB
RAM Clock	5600 MHz	7467 MHz
RAM Type	DDR5	LPDDR5X
Upgradable	Yes	No
Max RAM Size	192 GB
Total Slots	4
Memory Bus	PCI-E Gen 4.0 (4x)	PCI-E Gen 4.0 (4x)

With a larger RAM capacity of 32 GB, the Legion 9i Gen 10 2025 offers an advantage for multitasking and resource-intensive applications compared to the Zero Book Ultra's RAM capacity of 16 GB.

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.

LLM Category	Lenovo Legion 9i Gen 10 (2025)	Infinix Zero Book Ultra
Small Models(1-3B):Examples: Phi-2, Qwen-1.8B	✔ Run smoothly.	✔ Run smoothly.
Medium Models(7-8B):Examples: Mistral-7B, Qwen-7B	✔ Good performance.	✔ Good performance.
Large Models(13-30B):Examples: Mixtral, Qwen-14B	✔ Runs smoothly on GPU.	✖ Not supported.
Extra-Large Models(65B+):Examples: LLaMA2-70B, Qwen1.5-72B	⚠ Possible with CPU + RAM fallback using quantized models.	✖ 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.

📌 MoE Models: Some models like Mixtral 8x7B and Qwen3-30B-A3B use a Mixture of Experts (MoE) design, activating only part of the model during inference. This means they can often run efficiently on laptops with 12–16 GB of VRAM when quantized.

BATTERY

BATTERY	99.9 Wh	70 Wh
Battery Type	Li-Po	Li-Po
Replaceable	No	No
Fast Charging	Yes	No
Charging Port Position	Left, Bottom	Left
Charge Power	400 W	100 W

Moreover, the Legion 9i Gen 10 2025 boasts a larger battery capacity of 100 Wh, offering extended usage time compared to the Zero Book Ultra's70 Wh.

Battery Comparison

Lenovo Legion 9i Gen 10 2025

Avg: larger than 17.0"

Infinix Zero Book Ultra

Avg: 15.0-15.9"

STORAGE
With a larger storage capacity up to 4 TB, the Legion 9i Gen 10 2025 provides more space for storing files and applications compared to the Zero Book Ultra's max. storage capacity of 2 TB.

Storage Options	1 TB, 2 TB, 4 TB	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.

Lenovo Legion 9i Gen 10 2025 vs Infinix Zero Book Ultra: Display Comparison

The display is an essential aspect to consider when comparing the Lenovo Legion 9i Gen 10 2025 and Infinix Zero Book Ultra 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. Legion 9i Gen 10 2025 has a display size of 18.0".On the other hand, Zero Book Ultra has a smaller 15.6" display.The total usable screen area of the Legion 9i Gen 10 2025 is 939cm² / 146inch² whereas the Zero Book Ultra's total usable screen area is 670cm² / 104inch².

PPI (Pixels per Inch)
Additionally, the Legion 9i Gen 10 2025 features a higher pixel density with 252 pixels per inch (PPI), ensuring sharper image details.

Screen PPI (Pixels Per Inch) Comparison

Lenovo Legion 9i Gen 10 2025

Avg: larger than 17.0"

Infinix Zero Book Ultra

Avg: 15.0-15.9"

Refresh Rate
The Legion 9i Gen 10 2025 offers a higher refresh rate of 240 Hz, resulting in smoother motion and improved visual experience.

Brightness
The Legion 9i Gen 10 2025 offers a higher maximum brightness of 520 nits, delivering a brighter screen.

Brightness Comparison

Lenovo Legion 9i Gen 10 2025

Avg: larger than 17.0"

Infinix Zero Book Ultra

Avg: 15.0-15.9"

Lenovo Legion 9i Gen 10 2025 vs Infinix Zero Book Ultra Connectivity Comparison

In terms of connectivity,

Wifi
Legion 9i Gen 10 2025 features a more advanced Wi-Fi standard v7, providing faster and more reliable wireless connections compared to Zero Book Ultra (v6E).

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 Legion 9i Gen 10 2025 and Zero Book Ultra have USB-A ports. Legion 9i Gen 10 2025 has 3x USB 3.2 USB-A ports, while Zero Book Ultra has 2x USB 3.2 USB-A ports.
Both Legion 9i Gen 10 2025 and Zero Book Ultra have USB Type-C ports. Legion 9i Gen 10 2025 has 3x USB 4.0 USB Type-C ports, while Zero Book Ultra has 2x USB 3.2 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
Legion 9i Gen 10 2025 is equipped with Thunderbolt 5 port. Zero Book Ultra does not have Thunderbolt port.

HDMI
Both Legion 9i Gen 10 2025 and Zero Book Ultra feature an HDMI port. Legion 9i Gen 10 2025 offers 1x HDMI 2.1, while Zero Book Ultra 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
Both Legion 9i Gen 10 2025 and Zero Book Ultra come with an SD Card Reader for easy access to memory cards.

Audio Jack
Both Legion 9i Gen 10 2025 and Zero Book Ultra 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)	v7	v6E
Bluetooth (latest: v5.4)	v5.4	v5.3
USB-A (latest: 3.2)	3x USB 3.2	2x USB 3.2
USB Type-C (latest: USB4 2.0)	3x USB 4.0	2x USB 3.2
Thunderbolt (latest: 5)	Thunderbolt 5	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	No	Yes
Optical Drive	No	No
Audio Jack 3.5mm	Yes	Yes
Ethernet RJ45	Yes	No
SD CardReader	Yes	Yes
Proprietary Charging Port	Yes	No