The Dell Alienware m15 R7 comes at a premium price, offering high performance that can handle intensive tasks like 3D rendering, machine learning, and high-end gaming. However, it's heavier and less portable, which might make it less convenient for frequent travel. In contrast, the Lenovo Legion Slim 7 is much less expensive and offers a balance of performance and portability, suitable for general use and moderate gaming, making it a better option for those who prefer a lightweight laptop for everyday carry without straining their budget. 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 for engineering and design
Very good overall display quality
Very good overall build quality
Advantages of the Lenovo Legion Slim 7 15.6"
Good portability
Good battery life
Very good speakers
Key differences
Screen Quality
8.2/10
7.7/10
15.6in
SIZE
15.6in
2560 x 1440
RESOLUTION
1920 x 1080
IPS
DISPLAY TECHNOLOGY
IPS
240Hz
REFRESH RATE
165Hz
300.0 nits
BRIGHTNESS
350.0 nits
The Dell Alienware m15 R7 has a better screen than the Lenovo Legion Slim 7 for general use, gaming and AI, and engineering and design.
For general use, the Dell Alienware m15 R7's screen likely offers sharp visuals and vibrant colors at a high resolution, which along with ample brightness, makes for a pleasing viewing experience. In engineering and design, this laptop's screen likely covers a wider range of colors, which is critical for accurately rendering designs and models. However, for gaming and 3D applications, its lower refresh rate may lead to less fluid motion and slower response times, giving the Lenovo Legion Slim an edge in those scenarios despite both having poor screen performance for these specific tasks.
Battery
5.0 Hours
9.0 Hours
The Dell Alienware m15 R7 has 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
Fair
Good
15.6in
SIZE
15.6in
5.9 lbs
WEIGHT
4.1 lbs
0.9in
THICKNESS
0.6in
The Lenovo Legion Slim 7 15.6" has good portability, while the Dell Alienware m15 R7 has only fair portability.
The most portable laptops are small, thin, and light.
Build Quality
8.5/10
7.6/10
The Dell Alienware m15 R7 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
$2,200
$1,200
$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 15.6" costs $1,200.
The Lenovo Legion Slim 7 15.6" and Dell Alienware m15 R7 are both good for general use.
The Dell Alienware m15 R7 offers a robust AMD Ryzen 9 6900HX processor with a high-quality screen, but its heavier weight and shorter battery life make it less portable than the Lenovo Legion Slim 7, which provides a slightly less powerful AMD Ryzen 7 5800H CPU, slightly lower screen brightness and resolution but excels in portability with lighter weight and longer battery life. Both laptops come with ample RAM and quality keyboards, but the Lenovo Legion Slim 7 may appeal to those who prioritize extended usage away from power sources and easier transport, while the Dell Alienware m15 R7 caters to those who need higher performance and screen quality for demanding tasks.
Gaming and AI
7.8/10
7.4/10
8.7/10
OVERALL GPU SCORE
7.1/10
2560 x 1440
RESOLUTION
1920 x 1080
240Hz
REFRESH RATE
165Hz
Yes
SUPPORTS DLSS
Yes
Yes
MUX SWITCH / ADVANCED OPTIMUS
Yes
7.0/10
FAN NOISE SCORE
7.5/10
The Dell Alienware m15 R7 and Lenovo Legion Slim 7 15.6" are both good for gaming and AI.
The Dell Alienware m15 R7 stands out for gaming and 3D tasks with a higher-end GPU and a screen refresh rate that could lead to smoother visuals and improved gameplay experience, compared to the Lenovo Legion Slim 7, which has a capable but not as powerful GPU and lower screen refresh rate. However, the screen quality and CPU performance are quite good on both, with the Legion offering somewhat lower specs but still suitable for gaming and 3D applications.
Engineering and Design
8.2/10
7.8/10
8.5/10
OVERALL CPU SCORE
7.4/10
8.7/10
OVERALL GPU SCORE
7.1/10
16.0 GB
RAM
16.0 GB
Although they have very similar scores, PerfectRec considers Dell Alienware m15 R7 to be very good for engineering and design, while the Lenovo Legion Slim 7 15.6" is good.
The Dell Alienware m15 R7 excels in engineering and design tasks thanks to its more powerful CPU and high-end GPU, which are combined with a high-resolution display providing crisp visuals, though these features do contribute to the laptop being heavier and thicker than the Lenovo Legion Slim 7. The Lenovo Legion Slim 7, while also equipped with a capable CPU and GPU for design work, prioritizes portability with its lighter and slimmer form factor, and still offers a good quality display, although it's less sharp than the Dell's.
Content Creation
7.5/10
7.7/10
8.5/10
OVERALL CPU SCORE
7.4/10
2560 x 1440
RESOLUTION
1920 x 1080
16.0 GB
RAM
16.0 GB
IPS
DISPLAY TECHNOLOGY
IPS
The Lenovo Legion Slim 7 15.6" and Dell Alienware m15 R7 are both good for content creation.
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
7.3/10
7.5/10
8.5/10
OVERALL CPU SCORE
7.4/10
16.0 GB
RAM
16.0 GB
2560 x 1440
RESOLUTION
1920 x 1080
8.5/10
KEYBOARD QUALITY SCORE
8.5/10
The Lenovo Legion Slim 7 15.6" and Dell Alienware m15 R7 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.
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How the Dell Alienware m15 R7 and the Lenovo Legion Slim 7 15.6" compare to other laptops
"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."
"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 15.6"
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.
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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