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ROG Zephyrus G15
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Slim Pro 9i
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What we think

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Updated January 10, 2024·

When deciding between the ASUS ROG Zephyrus G15 and the Lenovo Slim Pro 9i, consider your priorities. The ASUS offers robust gaming performance and a large screen, which is great for gaming and engineering tasks, but it's less portable and has a shorter battery life. In contrast, the Lenovo has a smaller, sharper touch screen with more vivid colors and longer battery life, making it better for general use and portability. Additionally, it has superior speakers, webcam, and keyboard quality. Both have similar storage and price, but the Lenovo includes twice the RAM, which can enhance multitasking and complex tasks. Give Feedback

this description is based on the product variant with some specs and product variant with some specs. At the time of writing, the variant with some specs cost some dollars and the variant with some specs cost some dollars.
Advantages of the ASUS ROG Zephyrus G15
  • Best in class speakers
  • Excellent keyboard
Advantages of the Lenovo Slim Pro 9i
  • Very good for software development
  • Best in class overall display quality

Key differences

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Engineering and Design

8.1
ROG Zephyrus G15
Slim Pro 9i
8.9
7.5/10
OVERALL CPU SCORE
9.0/10
8.3/10
OVERALL GPU SCORE
7.1/10
16.0 GB
RAM
32.0 GB
The Lenovo Slim Pro 9i and ASUS ROG Zephyrus G15 are both very good for engineering and design, though the Lenovo Slim Pro 9i is somewhat better.

Software Development

7.5
ROG Zephyrus G15
Slim Pro 9i
8.4
7.5/10
OVERALL CPU SCORE
9.0/10
16.0 GB
RAM
32.0 GB
2560 x 1440
RESOLUTION
3072 x 1920
9.0/10
KEYBOARD QUALITY SCORE
8.0/10
The Lenovo Slim Pro 9i is very good for software development, while the ASUS ROG Zephyrus G15 is good.

Screen Quality

7.9
ROG Zephyrus G15
Slim Pro 9i
9.7
15.6in
SIZE
14.5in
2560 x 1440
RESOLUTION
3072 x 1920
IPS
DISPLAY TECHNOLOGY
Mini LED
165Hz
REFRESH RATE
165Hz
309.0 nits
BRIGHTNESS
618.0 nits
The Lenovo Slim Pro 9i has a better screen than the ASUS ROG Zephyrus G15 for general use, gaming and AI, engineering and design, content creation, and software development.

Battery

9.5 Hours
ROG Zephyrus G15
Slim Pro 9i
6.0 Hours
The ASUS ROG Zephyrus G15 has 9.5 hours of battery life. The Lenovo Slim Pro 9i has 6 hours of battery life.
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Key similarities

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General Use

8.0
ROG Zephyrus G15
Slim Pro 9i
8.5
2560 x 1440
RESOLUTION
3072 x 1920
IPS
DISPLAY TECHNOLOGY
Mini LED
309.0 nits
DISPLAY BRIGHTNESS
618.0 nits
9.5 Hours
BATTERY LIFE
6.0 Hours
9.0/10
KEYBOARD QUALITY SCORE
8.0/10
7.5/10
PORTABILITY SCORE
7.6/10
The Lenovo Slim Pro 9i and ASUS ROG Zephyrus G15 are both very good for general use.

Gaming and AI

7.6
ROG Zephyrus G15
Slim Pro 9i
7.7
8.3/10
OVERALL GPU SCORE
7.1/10
2560 x 1440
RESOLUTION
3072 x 1920
165Hz
REFRESH RATE
165Hz
Yes
SUPPORTS DLSS
Yes
No
MUX SWITCH / ADVANCED OPTIMUS
No
6.5/10
FAN NOISE SCORE
8.0/10
The Lenovo Slim Pro 9i and ASUS ROG Zephyrus G15 are both good for gaming and AI.

Content Creation

8.1
ROG Zephyrus G15
Slim Pro 9i
8.6
7.5/10
OVERALL CPU SCORE
9.0/10
2560 x 1440
RESOLUTION
3072 x 1920
16.0 GB
RAM
32.0 GB
IPS
DISPLAY TECHNOLOGY
Mini LED
The Lenovo Slim Pro 9i and ASUS ROG Zephyrus G15 are both very good for content creation.

Portability

Good
ROG Zephyrus G15
Slim Pro 9i
Good
15.6in
SIZE
14.5in
4.1 lbs
WEIGHT
3.7 lbs
0.7in
THICKNESS
0.8in
The Lenovo Slim Pro 9i and ASUS ROG Zephyrus G15 both have good portability.
The most portable laptops are small, thin, and light.

Build Quality

8.5
ROG Zephyrus G15
Slim Pro 9i
8.0
The ASUS ROG Zephyrus G15 and Lenovo Slim Pro 9i both have very good build quality.

Cost

$1,560
ROG Zephyrus G15
Slim Pro 9i
$1,500
Product imageProduct image

$500

$1,000

$1,500

$2,000

$2,500

The ASUS ROG Zephyrus G15 has a price of $1,560 and the Lenovo Slim Pro 9i costs $1,500.

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How the ASUS ROG Zephyrus G15 and the Lenovo Slim Pro 9i compare to other laptops

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Spec Comparison

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ASUS ROG Zephyrus G15Lenovo Slim Pro 9i
ASUS ROG Zephyrus G15Lenovo Slim Pro 9i

GENERAL

Price
$1,560
$1,500
Release Date
May 1, 2021February 1, 2023
Overall Dimensions
14'' x 9.6'' x 0.78''12.9'' x 9.6'' x 0.85''
Weight
4.19 lbs3.7 lbs

INTERNAL

Processor
AMD Ryzen 9 5900HSIntel i7-13705H
Graphics
RTX 3070 (95 W)RTX 4050 (100 W)
Mux Switch / Advanced Optimus
NoNo
RAM
16 GB32 GB
DDR Memory Version
45

BATTERY

Battery Life
9.5 Hours6 Hours
Battery Capacity
90 Wh75 Wh

SCREEN

Diagonal Size
15.6"14.5"
Display Technology
IPSMini LED
Resolution
2560 x 14403072 x 1920
Refresh Rate
165Hz165Hz
Display Brightness
309 nits618 nits

RELIABILITY, APPEARANCE & ACOUSTICS

Build Quality Score
8.5/108/10
Portability Score
7.5/107.7/10
Gaming Laptop Appearance
YesNo
Fan Noise Score
6.5/108/10
Keyboard Lighting Color
RGBWhite
Warranty Period
1 year1 year

HARDWARE FEATURES

Keyboard Quality Score
9/108/10
Speaker Quality Score
9.5/108/10
Webcam
No Webcam1080p
Fingerprint Reader
YesNo
Backlit Keyboard
YesYes
Number Pad
NoNo

CONNECTIVITY

USB Type-A
22
USB-C ports
22
USB-C Charging
YesYes
Display Outputs
33
Thunderbolt Version
N/A4

Shopping

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ASUS ROG Zephyrus G15

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Dig into reviews and images

NotebookCheck

Florian Glaser | February 2021
"As long as you're aware of the fact that the GeForce RTX 3080 laptop version can only unfold its potential to a limited extent due to Asus's low TDP setting and that it can be slower than a fast RTX 3070 laptop, the ROG Zephyrus G15 GA503Q cuts a fine figure. One of the biggest highlights turns out to be the WQHD panel, since it attracts customers with 165 Hz, relatively fast response times, FreeSync, and good color-space coverage. Other selling points are the surprisingly rich sound, the long battery life, and the sleek design. In terms of looks, the white edition stands out nicely from the competition."

Lenovo Slim Pro 9i

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Dig into reviews and images

PCWorld

Matthew S. Smith | August 2023
"The Lenovo Slim Pro 9i is an impressive laptop with a brilliant Mini-LED display, a powerful 100-watt version of Nvidia RTX 4050 graphics, and excellent connectivity. Having run the Cinebench benchmark again, we were impressed with the CPU performance. That makes the Slim Pro 9i is an easy recommendation, especially for those who care about GPU and CPU performance. It’s also a fantastic choice if you frequently view HDR movies and games on your laptop."

Get a great deal on the ASUS ROG Zephyrus G15 or the Lenovo Slim Pro 9i

About ASUS

ASUS, a Taiwanese electronics brand, is one of the largest personal computer vendor by market share. The majority of their laptops are targeted towards personal use or gaming. Their most popular product lines include the budget-friendly VivoBook, more premium ZenBook, and their TUF and ROG gaming laptops, the latter of which has a reputation for excellent gaming performance.

About Lenovo

Lenovo is a Chinese technology company, and one of the largest personal computer vendor. They are well known for a variety of technology products, including laptops. Their consumer series include their entry level IdeaPad and LOQ series and mid-to-high-end Yoga and Legion series. On the business-oriented side, their series include their entry-level ThinkBook series and mid-to-high-end ThinkPad series. Lenovo laptops offer strong performance for reasonable prices, and are often on sale.

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This information was produced and vetted by the PerfectRec laptops team. We are a product research and recommendation organization that meticulously reviews and evaluates the latest laptop information and makes it digestible for you.

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Joe is an entrepreneur and lifelong electronics enthusiast with a Ph.D in Economics from the University of Michigan.

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