A comparison of specs, key information, reviews, and best pricing from top retailers
Last updated -- hours ago | Report incorrect information
Company ProductName Specs
Company ProductName Specs
What we think
The PerfectRec laptop team Learn more
Updated January 12, 2024·
For those with a tighter budget looking for decent performance, the Dell Inspiron 15 3511 is a solid choice, featuring an Intel i5 processor and integrated graphics; however, it has a larger, heavier build and a standard screen resolution with a basic 60Hz refresh rate, suitable for everyday tasks. In contrast, the Lenovo Slim Pro 9i, while significantly pricier, delivers superior performance with an Intel i7 processor and Nvidia RTX graphics, making it well-suited for 3D, machine learning, and gaming. It boasts a high-resolution Mini LED screen with a faster refresh rate and is more portable, yet has a lower battery capacity than the Dell. 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 Inspiron 15 3511
- The Dell Inspiron 15 3511 has no clear advantages over the Lenovo Slim Pro 9i.
Advantages of the Lenovo Slim Pro 9i
- Very good for general use
- Very good for engineering and design
- Good for gaming and AI
- Very good for software development
- Very good for content creation
- Best in class overall display quality
- Very good overall build quality
- Very good speakers
- Very good keyboard
Key differences
General Use
7.6
8.5
1920 x 1080
RESOLUTION
3072 x 1920
IPS
DISPLAY TECHNOLOGY
Mini LED
230.0 nits
DISPLAY BRIGHTNESS
618.0 nits
6.5 Hours
BATTERY LIFE
6.0 Hours
6.5/10
KEYBOARD QUALITY SCORE
8.0/10
7.7/10
PORTABILITY SCORE
7.6/10
The Lenovo Slim Pro 9i is very good for general use, while the Dell Inspiron 15 3511 is good.
The Lenovo Slim Pro 9i outshines the Dell Inspiron 15 3511 in general use due to its superior CPU and screen quality, lighter weight for better portability, and longer battery life, which are very important factors; it also boasts a better keyboard and heat management, which are somewhat important. Although the Dell Inspiron may still be a good choice for general use with respectable CPU and RAM, its heavier weight and lower screen quality and battery life compared to the Lenovo make it less ideal for those who prioritize these features.
Gaming and AI
6.2
7.6
3.6/10
OVERALL GPU SCORE
6.9/10
1920 x 1080
RESOLUTION
3072 x 1920
60Hz
REFRESH RATE
165Hz
No
SUPPORTS DLSS
Yes
No
MUX SWITCH / ADVANCED OPTIMUS
No
7.5/10
FAN NOISE SCORE
8.0/10
The Lenovo Slim Pro 9i is good for gaming and AI, while the Dell Inspiron 15 3511 is only fair.
The Lenovo Slim Pro 9i excels in gaming and 3D because it has a superior graphics card, the Nvidia RTX 4050, and a higher screen refresh rate of 165Hz, providing smoother visuals and better performance compared to the Dell Inspiron 15 3511, which uses the integrated Intel Iris Xe graphics and has a standard refresh rate of 60Hz.
Engineering and Design
7.0
8.9
4.9/10
OVERALL CPU SCORE
9.0/10
3.6/10
OVERALL GPU SCORE
6.9/10
32.0 GB
RAM
32.0 GB
The Lenovo Slim Pro 9i is very good for engineering and design, while the Dell Inspiron 15 3511 is good.
The Lenovo Slim Pro 9i offers superior performance for engineering and design due to its more advanced CPU and dedicated graphics card, which render complex tasks and visuals more efficiently, and its higher resolution, superior screen technology, delivering crisp, color-accurate visuals that are essential in design work.
Content Creation
7.5
8.5
4.9/10
OVERALL CPU SCORE
9.0/10
1920 x 1080
RESOLUTION
3072 x 1920
32.0 GB
RAM
32.0 GB
IPS
DISPLAY TECHNOLOGY
Mini LED
The Lenovo Slim Pro 9i is very good for content creation, while the Dell Inspiron 15 3511 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
8.3
4.9/10
OVERALL CPU SCORE
9.0/10
32.0 GB
RAM
32.0 GB
1920 x 1080
RESOLUTION
3072 x 1920
6.5/10
KEYBOARD QUALITY SCORE
8.0/10
The Lenovo Slim Pro 9i is very good for software development, while the Dell Inspiron 15 3511 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
6.0
9.6
15.6in
SIZE
14.5in
1920 x 1080
RESOLUTION
3072 x 1920
IPS
DISPLAY TECHNOLOGY
Mini LED
60Hz
REFRESH RATE
165Hz
230.0 nits
BRIGHTNESS
618.0 nits
The Lenovo Slim Pro 9i has a better screen than the Dell Inspiron 15 3511 for general use, gaming and AI, engineering and design, content creation, and software development.
When choosing between the Dell Inspiron 15 3511 and the Lenovo Slim Pro 9i, consider your primary activities. The Lenovo offers superior screen quality vital for tasks needing accurate color representation, like engineering and design due to its wide color gamuts. If you're into gaming, neither is ideal with their poor refresh rates, but for general use, the Lenovo's higher resolution and brightness enhance your viewing experience significantly.
Build Quality
6.2
8.0
The Lenovo Slim Pro 9i has very good build quality, while the Dell Inspiron 15 3511 has only fair build quality.
PerfectRec’s Build Quality Score incorporates case materials, display and keyboard flex, hinge quality, and overall reliability.
Cost
$580
$1,600
$0
$500
$1,000
$1,500
$2,000
$2,500
The Dell Inspiron 15 3511 has a price of $580 and the Lenovo Slim Pro 9i costs $1,600.
Let Us Help Find Your Perfect Laptop
Find your new laptop
Key similarities
Battery
6.5 Hours
6.0 Hours
The Dell Inspiron 15 3511 has 6.5 hours of battery life. The Lenovo Slim Pro 9i has 6 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
14.5in
3.7 lbs
WEIGHT
3.7 lbs
0.7in
THICKNESS
0.8in
The Dell Inspiron 15 3511 and Lenovo Slim Pro 9i both have good portability.
The most portable laptops are small, thin, and light.
Give feedback
We’re constantly working to improve.
How the Dell Inspiron 15 3511 and the Lenovo Slim Pro 9i compare to other laptops
Spec Comparison
 |  | |
| Dell Inspiron 15 3511 | Lenovo Slim Pro 9i |
GENERAL | |||
|---|---|---|---|
| Price | |||
$580 | $1,600 | ||
Release Date | |||
Release Date | January 1, 2021 | February 1, 2023 | |
Overall Dimensions | |||
Overall Dimensions | 14.1'' x 9.3'' x 0.74'' | 12.9'' x 9.6'' x 0.85'' | |
Weight | |||
Weight | 3.7 lbs | 3.7 lbs | |
Width | |||
Width | 14.11" | 12.9" | |
Depth | |||
Depth | 9.27" | 9.64" | |
INTERNAL | |||
|---|---|---|---|
Processor | |||
Processor | Intel i5-1135G7 | Intel i7-13705H | |
RAM | |||
RAM | 32 GB | 32 GB | |
DDR Memory Version | |||
DDR Memory Version | 4 | 5 | |
RAM Slots | |||
RAM Slots | 2 | 0 | |
Storage | |||
Storage | 1024 GB | 1024 GB | |
BATTERY | |||
|---|---|---|---|
Battery Life | |||
Battery Life | 6.5 Hours | 6 Hours | |
Battery Capacity | |||
Battery Capacity | 41 Wh | 75 Wh | |
SCREEN | |||
|---|---|---|---|
Diagonal Size | |||
Diagonal Size | 15.6" | 14.5" | |
Display Technology | |||
Display Technology | IPS | Mini LED | |
Resolution | |||
Resolution | 1920 x 1080 | 3072 x 1920 | |
Refresh Rate | |||
Refresh Rate | 60Hz | 165Hz | |
Display Brightness | |||
Display Brightness | 230 nits | 618 nits | |
RELIABILITY, APPEARANCE & ACOUSTICS | |||
|---|---|---|---|
Build Quality Score | |||
Build Quality Score | 6.3/10 | 8/10 | |
Portability Score | |||
Portability Score | 7.8/10 | 7.7/10 | |
Gaming Laptop Appearance | |||
Gaming Laptop Appearance | No | No | |
Premium Business Laptop | |||
Premium Business Laptop | No | No | |
Fan Noise Score | |||
Fan Noise Score | 7.5/10 | 8/10 | |
HARDWARE FEATURES | |||
|---|---|---|---|
Keyboard Quality Score | |||
Keyboard Quality Score | 6.5/10 | 8/10 | |
Speaker Quality Score | |||
Speaker Quality Score | 6.5/10 | 8/10 | |
Webcam | |||
Webcam | 720p | 1080p | |
Fingerprint Reader | |||
Fingerprint Reader | No | No | |
Backlit Keyboard | |||
Backlit Keyboard | No | Yes | |
Number Pad | |||
Number Pad | Yes | No | |
CONNECTIVITY | |||
|---|---|---|---|
USB Type-A | |||
USB Type-A | 3 | 2 | |
USB-C ports | |||
USB-C ports | 0 | 2 | |
USB-C Charging | |||
USB-C Charging | No | Yes | |
Display Outputs | |||
Display Outputs | 1 | 3 | |
Thunderbolt Version | |||
Thunderbolt Version | N/A | 4 | |
Shopping
Dell Inspiron 15 3511
See more
Dig into reviews and images
PCMag
Zachary Cuevas | November 2021
"The Dell Inspiron 15 3000 (3511) is a solid, if unremarkable, 15-inch budget laptop. It improves on many of the issues we had with the previous 3505 model, and with the inclusion of Windows 11, the 3511 is already a step above its competition. The lack of a USB-C port, the subpar speakers, and the dim display are drawbacks to factor in, but it's still one of the better 15-inch budget laptops on the market, especially when you consider it's under $400."
Lenovo Slim Pro 9i
See more
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 Dell Inspiron 15 3511 or the Lenovo Slim Pro 9i
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.
Give feedback
We're constantly perfecting our model
Laptop guides you might be interested in
More comparisons for you
Compare Dell Inspiron 15 3511 vs. Acer Aspire 5 15
VS
Compare Dell Inspiron 15 3511 vs. Acer Swift X (2021)
VS
Compare Dell Inspiron 15 3511 vs. Lenovo V15
VS
Compare Lenovo Slim Pro 9i vs. Acer Predator Triton 300
VS
Compare Lenovo Slim Pro 9i vs. ASUS ROG Flow X13
VS
Compare Lenovo Slim Pro 9i vs. ASUS ROG Zephyrus G14
VS
FAQs
FAQs about laptops
Why trust us
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.
By the numbers
380
Laptops evaluated
48,640
Laptops stats compiled
13
Proprietary Laptops ratings developed
96,795
Recommendations made
20,973
Consumer hours saved
About the laptop team
Joe Golden, Ph.D
CEO and Laptops Editor
Joe is an entrepreneur and lifelong electronics enthusiast with a Ph.D in Economics from the University of Michigan.
Jason Lew
Staff Expert & Software Engineer
Jason is a staff expert and software engineer that has been making laptop recommendations for 7 years and moderates one of the largest laptop subreddits.
Chandradeep Chowdhury
Staff Expert & Software Engineer
Chandradeep is a staff expert and software engineer and expert in televisions and monitors. He’s been making monitor recommendations for ten years.
Craig Russell
Laptops Expert
Craig is a UK-based laptops expert. Craig works in IT, where he recommends and supports laptops and PCs for clients and has been recommending laptops on Reddit for five years.
Featured in
