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Updated January 10, 2024·
Consider the ASUS ROG Zephyrus G15 for superior gaming graphics and overall performance, thanks to its powerful processor and graphics card. It also has a higher screen resolution and longer battery life but comes at a higher price. The Lenovo Legion Slim 7, on the other hand, is a bit more budget-friendly and still offers commendable performance with a lighter weight for better portability. It doesn't match the ASUS in terms of gaming prowess or display quality. Both have robust build quality, but the ASUS edges out slightly in the performance category while the Lenovo is more portable. 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
- Very good for engineering and design
- Very good for content creation
- Very good overall build quality
- Best in class speakers
Advantages of the Lenovo Legion Slim 7 15.6"
- Very good keyboard
Key differences
Screen Quality
7.9
7.7
15.6in
SIZE
15.6in
2560 x 1440
RESOLUTION
1920 x 1080
IPS
DISPLAY TECHNOLOGY
IPS
165Hz
REFRESH RATE
165Hz
309.0 nits
BRIGHTNESS
350.0 nits
The ASUS ROG Zephyrus G15 has a better screen than the Lenovo Legion Slim 7 for general use, engineering and design, and content creation.
For general use, the ASUS ROG Zephyrus G15 stands out with its sharp resolution and bright display, which enhances readability and visibility, while the Lenovo Legion Slim also offers good quality visuals, but without the same level of brightness. In engineering and design, the ASUS's ability to represent a wide range of colors accurately is essential for professional color work, surpassing the Lenovo in this aspect. However, for gaming and 3D applications, the lower refresh rate of both laptops means less fluid motion and responsiveness, which may disappoint gamers accustomed to smoother visuals on higher-end gaming laptops.
Build Quality
8.5
7.6
The ASUS ROG Zephyrus G15 has very good build quality, while the Lenovo Legion Slim 7 15.6" has good build quality.
PerfectRec’s Build Quality Score incorporates case materials, display and keyboard flex, hinge quality, and overall reliability.
Cost
$1,637
$1,200
$500
$1,000
$1,500
$2,000
$2,500
The ASUS ROG Zephyrus G15 has a price of $1,637 and the Lenovo Legion Slim 7 15.6" costs $1,200.
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Key similarities
General Use
7.9
7.7
2560 x 1440
RESOLUTION
1920 x 1080
IPS
DISPLAY TECHNOLOGY
IPS
309.0 nits
DISPLAY BRIGHTNESS
350.0 nits
9.5 Hours
BATTERY LIFE
9.0 Hours
6.5/10
KEYBOARD QUALITY SCORE
8.5/10
7.5/10
PORTABILITY SCORE
7.6/10
The ASUS ROG Zephyrus G15 and Lenovo Legion Slim 7 15.6" are both good for general use.
The ASUS ROG Zephyrus G15 offers superior CPU performance, higher screen resolution, and larger battery capacity, making it very good for general use; its RAM capacity and quality speakers contribute to a premium experience. Conversely, the Lenovo Legion Slim 7 provides good general performance with adequate CPU power and RAM, but shines in portability due to its lightweight design and has a higher contrast ratio screen, which is desirable for certain visual tasks.
Gaming and AI
7.5
7.4
7.4/10
OVERALL GPU SCORE
7.1/10
2560 x 1440
RESOLUTION
1920 x 1080
165Hz
REFRESH RATE
165Hz
Yes
SUPPORTS DLSS
Yes
No
MUX SWITCH / ADVANCED OPTIMUS
Yes
6.5/10
FAN NOISE SCORE
7.5/10
The ASUS ROG Zephyrus G15 and Lenovo Legion Slim 7 15.6" are both good for gaming and AI.
The ASUS ROG Zephyrus G15 has an Nvidia RTX 3070 and a 165Hz refresh rate display, making it an excellent choice for smooth gaming and 3D work thanks to its powerful graphics processing and ability to display fast-moving images fluidly. The Lenovo Legion Slim 7, while still suitable for gaming and 3D with its Nvidia RTX 3060 and identical 165Hz screen refresh rate, offers slightly less graphical prowess but benefits from greater screen brightness and higher contrast, enhancing visual clarity and detail.
Engineering and Design
8.0
7.8
7.5/10
OVERALL CPU SCORE
7.4/10
7.4/10
OVERALL GPU SCORE
7.1/10
16.0 GB
RAM
16.0 GB
Although they have very similar scores, PerfectRec considers ASUS ROG Zephyrus G15 to be very good for engineering and design, while the Lenovo Legion Slim 7 15.6" is good.
PerfectRec’s Engineering and Design Score takes into account the many different features of the laptop that make it more or less suitable for graphic design and 3D rendering work.
Content Creation
8.0
7.7
7.5/10
OVERALL CPU SCORE
7.4/10
2560 x 1440
RESOLUTION
1920 x 1080
16.0 GB
RAM
16.0 GB
IPS
DISPLAY TECHNOLOGY
IPS
Although they have very similar scores, PerfectRec considers ASUS ROG Zephyrus G15 to be very good for content creation, while the Lenovo Legion Slim 7 15.6" is good.
PerfectRec’s Content Creation Score takes into account the many different features of the laptop that make it more or less suitable for photo editing, video editing and other content creation tasks.
Software Development
7.4
7.5
7.5/10
OVERALL CPU SCORE
7.4/10
16.0 GB
RAM
16.0 GB
2560 x 1440
RESOLUTION
1920 x 1080
6.5/10
KEYBOARD QUALITY SCORE
8.5/10
The Lenovo Legion Slim 7 15.6" and ASUS ROG Zephyrus G15 are both good for software development.
PerfectRec’s Software Development Score takes into account the many different features of the laptop that make it more or less suitable for software developers.
Battery
9.5 Hours
9.0 Hours
The ASUS ROG Zephyrus G15 has 9.5 hours of battery life. The Lenovo Legion Slim 7 has 9 hours of battery life.
Battery life estimate is based on a mix of common use patterns. More portable and higher performing laptops tend to have less battery life.
Portability
Good
Good
15.6in
SIZE
15.6in
4.1 lbs
WEIGHT
4.1 lbs
0.7in
THICKNESS
0.6in
The Lenovo Legion Slim 7 15.6" and ASUS ROG Zephyrus G15 both have good portability.
The most portable laptops are small, thin, and light.
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How the ASUS ROG Zephyrus G15 and the Lenovo Legion Slim 7 15.6" compare to other laptops
Spec Comparison
 |  | |
| ASUS ROG Zephyrus G15 | Lenovo Legion Slim 7 15.6" |
GENERAL | |||
|---|---|---|---|
| Price | |||
$1,637 | $1,200 | ||
Release Date | |||
Release Date | May 1, 2021 | May 1, 2022 | |
Overall Dimensions | |||
Overall Dimensions | 14'' x 9.6'' x 0.78'' | 14'' x 9.9'' x 0.69'' | |
Weight | |||
Weight | 4.19 lbs | 4.19 lbs | |
Width | |||
Width | 13.98" | 14.02" | |
Depth | |||
Depth | 9.57" | 9.92" | |
INTERNAL | |||
|---|---|---|---|
Processor | |||
Processor | AMD Ryzen 9 5900HS | AMD Ryzen 7 5800H | |
RAM | |||
RAM | 16 GB | 16 GB | |
DDR Memory Version | |||
DDR Memory Version | 4 | 4 | |
RAM Slots | |||
RAM Slots | 1 | 1 | |
Storage | |||
Storage | 1024 GB | 512 GB | |
BATTERY | |||
|---|---|---|---|
Battery Life | |||
Battery Life | 9.5 Hours | 9 Hours | |
Battery Capacity | |||
Battery Capacity | 90 Wh | 71 Wh | |
SCREEN | |||
|---|---|---|---|
Diagonal Size | |||
Diagonal Size | 15.6" | 15.6" | |
Display Technology | |||
Display Technology | IPS | IPS | |
Resolution | |||
Resolution | 2560 x 1440 | 1920 x 1080 | |
Refresh Rate | |||
Refresh Rate | 165Hz | 165Hz | |
Display Brightness | |||
Display Brightness | 309 nits | 350 nits | |
RELIABILITY, APPEARANCE & ACOUSTICS | |||
|---|---|---|---|
Build Quality Score | |||
Build Quality Score | 8.5/10 | 7.6/10 | |
Portability Score | |||
Portability Score | 7.5/10 | 7.6/10 | |
Gaming Laptop Appearance | |||
Gaming Laptop Appearance | Yes | Yes | |
Premium Business Laptop | |||
Premium Business Laptop | No | No | |
Fan Noise Score | |||
Fan Noise Score | 6.5/10 | 7.5/10 | |
HARDWARE FEATURES | |||
|---|---|---|---|
Keyboard Quality Score | |||
Keyboard Quality Score | 6.5/10 | 8.5/10 | |
Speaker Quality Score | |||
Speaker Quality Score | 9.5/10 | 8/10 | |
Webcam | |||
Webcam | No Webcam | 720p | |
Fingerprint Reader | |||
Fingerprint Reader | Yes | Yes | |
Backlit Keyboard | |||
Backlit Keyboard | Yes | Yes | |
Number Pad | |||
Number Pad | No | Yes | |
CONNECTIVITY | |||
|---|---|---|---|
USB Type-A | |||
USB Type-A | 2 | 2 | |
USB-C ports | |||
USB-C ports | 2 | 2 | |
USB-C Charging | |||
USB-C Charging | Yes | Yes | |
Display Outputs | |||
Display Outputs | 3 | 2 | |
Thunderbolt Ports | |||
Thunderbolt Ports | 0 | 0 | |
Shopping
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 Legion Slim 7 15.6"
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Dig into reviews and images
NotebookCheck
Benjamin Herzig | November 2022
"The Lenovo Legion Slim 7 is a slim Legion notebook that is just as excellent with Nvidia & Intel. However, the Legion Slim 7i slightly sullied by lacklustre battery life. You get a slim aluminium chassis, great input devices, decent port selection, fast high-quality WQXGA display and great performance. Supporting Thunderbolt 4 is one advantage of the Intel/Nvidia model tested in this review. Moreover, this variant has slightly higher CPU performance as well as better GPU performance in certain applications (e.g. CUDA-based apps). The Lenovo Legion S7i is thin, premium and performant – but less efficient than its AMD counterpart."
Get a great deal on the ASUS ROG Zephyrus G15 or the Lenovo Legion Slim 7 15.6"
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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