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Updated January 10, 2024·
The Dell Alienware m15 R7 is more expensive and has better performance for intensive tasks like gaming, machine learning, and engineering software. It features a robust build, a high-refresh display, and has higher heat management and noise levels due to powerful internal components. In contrast, the Lenovo Legion Slim 7 16" is more affordable, lighter, and thinner, making it more portable. It has a larger screen with higher resolution but might not match the Alienware in terms of raw performance. Consider your budget, need for performance, and how much you value portability when making your choice. 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 Dell Alienware m15 R7
- Very good overall build quality
Advantages of the Lenovo Legion Slim 7 16"
- Very good for general use
- Very good for gaming and AI
- Very good for software development
- Very good for content creation
- Good portability
- Good battery life
- Very good speakers
Key differences
General Use
7.5
8.2
2560 x 1440
RESOLUTION
2560 x 1600
IPS
DISPLAY TECHNOLOGY
IPS
300.0 nits
DISPLAY BRIGHTNESS
502.0 nits
5.0 Hours
BATTERY LIFE
7.0 Hours
8.5/10
KEYBOARD QUALITY SCORE
8.5/10
6.4/10
PORTABILITY SCORE
7.5/10
The Lenovo Legion Slim 7 16" is very good for general use, while the Dell Alienware m15 R7 is good.
PerfectRec’s General Use Score takes into account the many different features of the laptop that make it more or less suitable for general productivity, web browsing, streaming, video calls, and running a wide variety of apps and programs.
Content Creation
7.5
8.3
8.5/10
OVERALL CPU SCORE
9.1/10
2560 x 1440
RESOLUTION
2560 x 1600
16.0 GB
RAM
16.0 GB
IPS
DISPLAY TECHNOLOGY
IPS
The Lenovo Legion Slim 7 16" is very good for content creation, while the Dell Alienware m15 R7 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
7.3
8.0
8.5/10
OVERALL CPU SCORE
9.1/10
16.0 GB
RAM
16.0 GB
2560 x 1440
RESOLUTION
2560 x 1600
8.5/10
KEYBOARD QUALITY SCORE
8.5/10
The Lenovo Legion Slim 7 16" is very good for software development, while the Dell Alienware m15 R7 is good.
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.
Screen Quality
8.2
8.7
15.6in
SIZE
16.0in
2560 x 1440
RESOLUTION
2560 x 1600
IPS
DISPLAY TECHNOLOGY
IPS
240Hz
REFRESH RATE
240Hz
300.0 nits
BRIGHTNESS
502.0 nits
The Lenovo Legion Slim 7 has a better screen than the Dell Alienware m15 R7 for general use, gaming and AI, engineering and design, content creation, and software development.
For general use, both the Dell Alienware m15 R7 and the Lenovo Legion Slim 7 offer crisp visuals with their high-resolution displays and good brightness, making text sharp and colors vibrant for activities like browsing and watching videos. These laptops are also well-suited for engineering and design tasks since they cover a wide range of colors, allowing for accurate color work in professional software. However, for gaming and 3D tasks where smooth motion is key, their screens fall short due to lower refresh rates, which might result in less fluid gameplay compared to laptops with higher refresh rates.
Battery
5.0 Hours
7.0 Hours
The Dell Alienware m15 R7 has 5 hours of battery life. The Lenovo Legion Slim 7 has 7 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
Fair
Good
15.6in
SIZE
16.0in
5.9 lbs
WEIGHT
4.4 lbs
0.9in
THICKNESS
0.6in
The Lenovo Legion Slim 7 16" has good portability, while the Dell Alienware m15 R7 has only fair portability.
The most portable laptops are small, thin, and light.
Build Quality
8.5
7.6
The Dell Alienware m15 R7 has very good build quality, while the Lenovo Legion Slim 7 16" has good build quality.
PerfectRec’s Build Quality Score incorporates case materials, display and keyboard flex, hinge quality, and overall reliability.
Cost
$2,200
$1,344
$500
$1,000
$1,500
$2,000
$2,500
$3,000
$3,500
The Dell Alienware m15 R7 has a price of $2,200 and the Lenovo Legion Slim 7 16" costs $1,344.
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Key similarities
Gaming and AI
7.8
8.2
8.7/10
OVERALL GPU SCORE
8.3/10
2560 x 1440
RESOLUTION
2560 x 1600
240Hz
REFRESH RATE
240Hz
Yes
SUPPORTS DLSS
Yes
Yes
MUX SWITCH / ADVANCED OPTIMUS
Yes
7.0/10
FAN NOISE SCORE
7.5/10
Although they have very similar scores, PerfectRec considers Lenovo Legion Slim 7 16" to be very good for gaming and AI, while the Dell Alienware m15 R7 is good.
PerfectRec’s Gaming and AI Score strongly emphasizes graphics processing capability, while also taking into account other factors that impact suitability for gaming and AI work.
Engineering and Design
8.2
8.6
8.5/10
OVERALL CPU SCORE
9.1/10
8.7/10
OVERALL GPU SCORE
8.3/10
16.0 GB
RAM
16.0 GB
The Lenovo Legion Slim 7 16" and Dell Alienware m15 R7 are both very good for engineering and design.
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.
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How the Dell Alienware m15 R7 and the Lenovo Legion Slim 7 16" compare to other laptops
Spec Comparison
 |  | |
| Dell Alienware m15 R7 | Lenovo Legion Slim 7 16" |
GENERAL | |||
|---|---|---|---|
| Price | |||
$2,200 | $1,344 | ||
Release Date | |||
Release Date | May 1, 2022 | May 1, 2023 | |
Overall Dimensions | |||
Overall Dimensions | 14'' x 10.7'' x 0.94'' | 14.1'' x 10.2'' x 0.69'' | |
Weight | |||
Weight | 5.93 lbs | 4.4 lbs | |
Width | |||
Width | 14.02" | 14.08" | |
Depth | |||
Depth | 10.73" | 10.21" | |
INTERNAL | |||
|---|---|---|---|
Processor | |||
Processor | AMD Ryzen 9 6900HX | AMD Ryzen 7 7840HS | |
RAM | |||
RAM | 16 GB | 16 GB | |
DDR Memory Version | |||
DDR Memory Version | 5 | 5 | |
RAM Slots | |||
RAM Slots | 2 | 1 | |
Storage | |||
Storage | 512 GB | 1024 GB | |
BATTERY | |||
|---|---|---|---|
Battery Life | |||
Battery Life | 5 Hours | 7 Hours | |
Battery Capacity | |||
Battery Capacity | 86 Wh | 99.9 Wh | |
SCREEN | |||
|---|---|---|---|
Diagonal Size | |||
Diagonal Size | 15.6" | 16" | |
Display Technology | |||
Display Technology | IPS | IPS | |
Resolution | |||
Resolution | 2560 x 1440 | 2560 x 1600 | |
Refresh Rate | |||
Refresh Rate | 240Hz | 240Hz | |
Display Brightness | |||
Display Brightness | 300 nits | 502 nits | |
RELIABILITY, APPEARANCE & ACOUSTICS | |||
|---|---|---|---|
Build Quality Score | |||
Build Quality Score | 8.5/10 | 7.6/10 | |
Portability Score | |||
Portability Score | 6.5/10 | 7.5/10 | |
Gaming Laptop Appearance | |||
Gaming Laptop Appearance | Yes | No | |
Premium Business Laptop | |||
Premium Business Laptop | No | No | |
Fan Noise Score | |||
Fan Noise Score | 7/10 | 7.5/10 | |
HARDWARE FEATURES | |||
|---|---|---|---|
Keyboard Quality Score | |||
Keyboard Quality Score | 8.5/10 | 8.5/10 | |
Speaker Quality Score | |||
Speaker Quality Score | 7.5/10 | 8/10 | |
Webcam | |||
Webcam | 720p | 1080p | |
Fingerprint Reader | |||
Fingerprint Reader | No | Yes | |
Backlit Keyboard | |||
Backlit Keyboard | Yes | Yes | |
Number Pad | |||
Number Pad | No | Yes | |
CONNECTIVITY | |||
|---|---|---|---|
USB Type-A | |||
USB Type-A | 3 | 3 | |
USB-C ports | |||
USB-C ports | 1 | 2 | |
USB-C Charging | |||
USB-C Charging | No | Yes | |
Display Outputs | |||
Display Outputs | 2 | 3 | |
Thunderbolt Ports | |||
Thunderbolt Ports | 0 | 0 | |
Shopping
Dell Alienware m15 R7
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Dig into reviews and images
Tom's Hardware
Brandon Hill | October 2022
"The Alienware M15 offers solid gaming and leading endurance. It makes the most of its CPU and GPU while delivering stellar battery life for a gaming laptop. Opening the lid presents a full-size keyboard with honeycomb cutouts above it on the deck. An oblong RBG lightning element surrounds the entire rear panel and can be color-synced with the other lights on the laptop. There’s not a lot to dislike about the M15 Its productivity performance lagged in some areas, particularly in the storage benchmark, and it’s a bit heavy. Alienware has a clear winner here with the M15 based on its strong overall performance and endurance."
Lenovo Legion Slim 7 16"
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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 Dell Alienware m15 R7 or the Lenovo Legion Slim 7 16"
About Dell
Dell is a highly recognizable American technology company, and is one of the largest personal computer vendor by market share. Their laptops are very popular for both personal and professional use, and they also own the Alienware brand which makes mid to high end gaming laptops. Their premium XPS range of laptops offer great build quality and portability, while Latitude and Precision laptops are known for reliability, repairability and performance for business users.
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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