Alienware M15 R5 vs. Lenovo Legion Slim 7 (15”, AMD, 2020): Which is better?

Here is a side by side comparison between Alienware M15 R5 and Lenovo Legion Slim 7 (15”, AMD, 2020) specs including CPU, RAM, storage, battery, display, and more.

Alienware M15 R5 Pros

Reasons that Alienware M15 R5 is better than Lenovo Legion Slim 7 (15”, AMD, 2020).

Slightly faster CPU performance

AMD Ryzen 9-5900HX inside Alienware M15 R5 has a 12% better multi-core CPU performance score than the AMD Ryzen 9-4900H inside Lenovo Legion Slim 7 (15”, AMD, 2020).

Geekbench 5 multi-core score
Alienware M15 R5 - AMD Ryzen 9-5900HX
7,663
Alienware M15 R5 - AMD Ryzen 7-5800H
7,098
Lenovo Legion Slim 7 (15”, AMD, 2020) - AMD Ryzen 9-4900H
6,806
Lenovo Legion Slim 7 (15”, AMD, 2020) - AMD Ryzen 7-4800H
6,440
Lenovo Legion Slim 7 (15”, AMD, 2020) - AMD Ryzen 5-4600H
4,908

Lenovo Legion Slim 7 (15”, AMD, 2020) Pros

Reasons that Lenovo Legion Slim 7 (15”, AMD, 2020) is better than Alienware M15 R5.

About 24% lighter

Lenovo Legion Slim 7 (15”, AMD, 2020) weighed 4.1 pounds, 24% lighter than the 5.34 pounds Alienware M15 R5.

WeightAlienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Pound
5.34 lbs.
4.1 lbs.
Kilogram
2.42 kg
1.86 kg

Key Similars

Similar characteristics share between Alienware M15 R5 and Lenovo Legion Slim 7 (15”, AMD, 2020).

Supports the same maximum memory size of up to 32GB

Both laptops supports up to 32GB of system memory.

Max system memory size
Alienware M15 R5
32 GB
Lenovo Legion Slim 7 (15”, AMD, 2020)
32 GB
Uses the same memory type and speed

Both laptops supports the same 3200MHz DDR4 RAM.

Memory type and speed
Alienware M15 R5 - DDR4
3,200 MHz
Lenovo Legion Slim 7 (15”, AMD, 2020) - DDR4
3,200 MHz
Upgradable memory

Both laptops come with available RAM slots that allow you to replace or upgrade when needed.

MemoryAlienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Slots
x2
x0,1
TypeDDR4DDR4

Prices

Here are the latest price updates and offers for both devices.

Alienware M15 R5 AMD Ryzen Price
Alienware M15 R5 Gaming Laptop, 15.6 inch FHD 360Hz 1ms G-SYNC Display, AMD Ryzen R9 5900HX, GeForce RTX 3070, 64GB RAM, 2TB NVMe SSD, Killer WiFi, RGB Keyboard, Windows 11, Dark Side of The Moon
Alienware M15 R5 Gaming Laptop, 15.6 inch FHD 360Hz 1ms G-SYNC Display, AMD Ryzen R9 5900HX, GeForce RTX 3070, 64GB RAM, 2TB NVMe SSD, Killer WiFi, RGB Keyboard, Windows 11, Dark Side of The Moon
By Dell
$2,659.00
Dell Alienware m15 R5 Ryzen Edition Gaming Laptop (2021) | 15.6" FHD | Core Ryzen 9-1TB SSD - 32GB RAM - RTX 3070 | 12 Cores @ 4.7 GHz - 8GB GDDR6
Dell Alienware m15 R5 Ryzen Edition Gaming Laptop (2021) | 15.6" FHD | Core Ryzen 9-1TB SSD - 32GB RAM - RTX 3070 | 12 Cores @ 4.7 GHz - 8GB GDDR6
By Dell
$2,584.00
Dell Alienware m15 R5 Ryzen Edition Gaming Laptop (2021) | 15.6" 360Hz FHD | Core Ryzen 7-512GB SSD Hard Drive - 16GB RAM - RTX 3070 | 8 Cores @ 4.4 GHz - 8GB GDDR6 Win 11 Home (Renewed)
Dell Alienware m15 R5 Ryzen Edition Gaming Laptop (2021) | 15.6" 360Hz FHD | Core Ryzen 7-512GB SSD Hard Drive - 16GB RAM - RTX 3070 | 8 Cores @ 4.4 GHz - 8GB GDDR6 Win 11 Home (Renewed)
By Dell
$1,756.70
Lenovo Legion Slim 7 (15”, AMD, 2020) Price
Lenovo - Legion Slim 7 - Gaming Laptop - AMD Ryzen 7 5800H - 16GB DDR4 RAM - 2 x 1TB NVMe TLC SSD - NVIDIA GeForce RTX 3060 Max-Q Graphics - 15.6" FHD 165 Hz - Windows
Lenovo - Legion Slim 7 - Gaming Laptop - AMD Ryzen 7 5800H - 16GB DDR4 RAM - 2 x 1TB NVMe TLC SSD - NVIDIA GeForce RTX 3060 Max-Q Graphics - 15.6" FHD 165 Hz - Windows
By Lenovo
$1,849.00
$1,980.00 7% OFF
Lenovo Legion Slim 7 16IRH8 16" Laptop AMD Ryzen 7 7840HS GeForce RTX 4060 16GB 1TB SSD W11H (Renewed)
Lenovo Legion Slim 7 16IRH8 16" Laptop AMD Ryzen 7 7840HS GeForce RTX 4060 16GB 1TB SSD W11H (Renewed)
By Lenovo
$1,199.99
Lenovo Legion Slim 5 Gen 8 AMD 14" Laptop (2023 Model) - AMD Ryzen 7 7840HS 8-Core, NVIDIA GeForce RTX 4060, 16GB RAM, 512 GB M.2 NVMe SSD, 14.5" 2.8K OLED 400-Nits, Windows 11 Home
Lenovo Legion Slim 5 Gen 8 AMD 14" Laptop (2023 Model) - AMD Ryzen 7 7840HS 8-Core, NVIDIA GeForce RTX 4060, 16GB RAM, 512 GB M.2 NVMe SSD, 14.5" 2.8K OLED 400-Nits, Windows 11 Home
By Lenovo
$1,449.99

Availability

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Released20212020
Release DateAnnounced on April 20, 2021Announced on November 11, 2020
Generations-

Exterior

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Dimensions14.02” x 10.73” x 0.47 - 0.76” (356.20 x 272.50 x 12 - 19.25 mm)14.01 x 9.84 x 0.6 - 0.7 inches (356 x 250 x 15.9 - 17.9 mm)
Weight5.34 - 5.93 lbs (2.42 - 2.69 kg)Starting at 4.1 lbs (1.86 kg)
ColorsDark Side of the Moon with High Endurance Clear Coat and Silky Smooth Finish
Slate grey
Keyboard and Trackpad
  • Keyboard
    • Alienware mSeries 4-Zone AlienFX RGB keyboard.
    • RGB per-key backlit Cherry mechanical keyboard.
    • AlienFX lighting
    • Includes anti-ghosting and N-key rollover technology
    • 1.8mm key travel
    • 0.2mm-dish concave key design
  • Touchpad
    • 4.13 x 2.36 in (105 mm x 80 mm) precision touchpad with multi-touch gesture support.
  • 6-row, spill-resistant, multimedia Fn keys, numeric keypad.
  • LED backlight.
  • Buttonless glass surface multi-touch touchpad supports Precision TouchPad (PTP).

Display

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Size15.6 Inches15.6 Inches
Info
  • 15.6” FHD with 165Hz
    1920 x 1080 141 PPI 9ms response time 300 nits 16:9 100% sRGB color gamut 1000:1 Anti-glare WVA 6W
  • 15.6” FHD with 360Hz
    1920 x 1080 141 PPI 5ms response time 300 nits 16:9 100% sRGB color gamut 1000:1 Anti-glare WVA 8W
  • 15.6” QHD with 240Hz
    2560 x 1440 188 PPI 9ms response time 400 nits 16:9 99% DCI-P3 color gamut 1000:1 Anti-glare WVA 10W
  • 15.6" FHD 60Hz
    1920 x 1080 IPS 60 Hz 100% sRGB Dolby Vision® Supported 300 nits
  • 15.6" FHD 144Hz 
    1920 x 1080 IPS 144 Hz Up to 3 ms with OD Response Time 100% sRGB Dolby Vision® Supported 300 nits
  • 15.6" UHD 60Hz
    3840 x 2160 IPS 60 Hz 100% Adobe RGB VESA DisplayHDR 400 Certified Dolby Vision® Supported 500 nits

Ports

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Alienware M15 R5 Ports
Image Source: Dell
  • 1 x USB-C 3.2 Gen 2 with DisplayPort
  • 2 x USB-A 3.2 Gen 1 Port
  • 1 x USB-A 3.2 Gen 1 port with PowerShare
  • 1 x RJ-45
  • 1 x HDMI 2.1
    Supports up to 4K@120Hz display out.
  • 1 x Headset port
  • 1 x Power/DC-in Port
  • 1 x USB-C 3.2 Gen 2
    Supports DisplayPort™ 1.4b, and Power Delivery 100W.
  • 1 x USB-A 3.2 Gen 2
  • 1 x USB-A 3.2 Gen 2 (Always On)
  • 1 x 4-in-1 Full-size SD Card Reader
  • 1 x Audio jack
  • 1 x Power adapter

Internal Specs

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Processor
  1. AMD Ryzen™ 7 5800H
    8 cores, 16 threads, 3.20 → 4.40 GHz, 4MB L2 Cache, 16MB L3 Cache, 45W
  2. AMD Ryzen™ 9 5900HX
    8 cores, 16 threads, 3.30 → 4.60 GHz, 4MB L2 Cache, 16MB L3 Cache, 45W
  1. AMD Ryzen™ 5 4600H
    6 cores, 12 threads, 3.00 → 4.00 GHz, 3MB L2 Cache, 8MB L3 Cache, 45W
  2. AMD Ryzen™ 7 4800H
    8 cores, 16 threads, 2.90 → 4.20 GHz, 4MB L2 Cache, 8MB L3 Cache, 45W
  3. AMD Ryzen™ 9 4900H
    8 cores, 16 threads, 3.30 → 4.40 GHz, 4MB L2 Cache, 8MB L3 Cache, 45W
Integrated Graphics
  1. AMD Ryzen™ 7 5800H
    AMD Radeon™ Graphics
    8 Graphics Cores, 2000 MHz
  2. AMD Ryzen™ 9 5900HX
    AMD Radeon™ Graphics
    8 Graphics Cores, 2100 MHz
  1. AMD Ryzen™ 5 4600H
    AMD Radeon™ Graphics
    6 Graphics Cores, 1500 MHz
  2. AMD Ryzen™ 7 4800H
    AMD Radeon™ Graphics
    7 Graphics Cores, 1600 MHz
  3. AMD Ryzen™ 9 4900H
    AMD Radeon™ Graphics
    8 Graphics Cores, 1750 MHz
Memory
8 GB 16 GB 32 GB
3200MHz Dual-channel DDR4 SDRAM.
2 x SO-DIMM slots.
8GB 16GB 32GB
3200 MHz DDR4 Memory
  • 1 x Onboard Memory
  • 1 x SO-DIMM DDR4 Slot
Discrete Graphics
  • NVIDIA® GeForce RTX™ 3050 Ti
    4GB GDDR6 VRAM.
  • NVIDIA® GeForce RTX™ 3060
    6GB GDDR6 VRAM.
  • NVIDIA® GeForce RTX™ 3070
    8GB GDDR6 VRAM.
  • NVIDIA® GeForce® GTX 1650 Ti
    4GB GDDR6
  • NVIDIA® GeForce® GTX 1660 Ti
    Max-Q Design, 6GB GDDR6
  • NVIDIA® GeForce RTX™ 2060
    Max-Q Design, 6GB GDDR6
Storage2 x M.2 2230/2280 slots (Up to 2TB each)
512 GB 1TB 2TB
M.2 2280 SSD
  • 2 x PCIe NVMe, PCIe 3.0 x4 slots

Connectivity

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Wi-FiRivet Killer Wi-Fi 6 AX1650x
Dual Band 2.4 GHz/5 GHz Up to 2400 Mbps WiFi 6 802.11a/b/g/n/ac/ax
Killer Wi-Fi 6 AX1650, 802.11ax 2x2 Wi-Fi + Bluetooth 5.1, M.2 Card
BluetoothBluetooth 5.2Bluetooth 5.1
EthernetGigabit Ethernet Controller
Transfer rate: 10/100/1000/2500 Mbps
-

Battery

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Size
  • 56 WHr, 3-cell smart lithium-ion battery
  • 86 WHr, 6-cell smart lithium-ion battery
71 WHr (Integrated 3-Cell Li-Polymer battery)
Battery Life-Up to 4.9 hours
Tested with MobileMark® 2018
Power Supply
180W 240W
power adapter.
170W 230W
Slim tip AC adapter.

Software

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
OS
Windows 10 Home Windows 10 Pro
Upgradable to Windows 11
  • Windows 10 Home 64
  • Windows 10 Pro 64
  • FreeDOS
  • No operating system
Built-in Apps
  • Alienware Command Center
    Supports AlienFX lighting, Game
    Library with auto-tune game profile functionality.
  • Alienware Adrenalin
  • Alienware Mobile Connect
  • Microsoft Office 365 (30-day trial)
Lenovo Vantage Dolby Atmos® Speaker System Dolby Vision® Xrite-Pantone Color Management McAfee® Antivirus

Camera & Audio

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
CameraFront-facing camera
Alienware HD (1280x720 resolution) camera.
Top-placed Built-in HD Webcam (720p) with Privacy Shutter
Audio
  • Controller: Realtek ALC3254
    • 7.1 Digital Audio out using HDMI out connection
    • Alienware Sound Center via Alienware Command Center
  • Speakers:
    • 2 x 2W speakers
  • Microphone:
    • Dual-array microphones
  • 2 x 2W Dolby Atmos® Speaker System for Gaming
  • Dual array microphone

Misc

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
Sensors-
  • Fingerprint Reader Combined with Power Button
Security-
  • Fingerprint Reader
    • Touch style fingerprint reader on the power button
  • BIOS Security
    • Power-on password
    • Supervisor password
  • Other Security
    • Camera privacy shutter
In the box-
  • Lenovo Legion Slim 7 15”
  • AC adapter
  • Internal Battery
  • Quick Start Guide
Warranty-2-year (1-yr battery) depot service

Key Features

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)
At Glance
Released in Early
2021
16:9 QHD
15.6”
1440p 240Hz
Weight
5.34 lb
2.42 kg
Up to
AMD Ryzen 9-5900HX
8C/16T, 3.30 → 4.60 GHz
Geekbench 5
1,416
Single Core
Geekbench 5
7,663
Multi-Core
With integrated
AMD Radeon™ Graphics
8 Graphics Cores, 2100 MHz
Upgradable up to
32GB
3200 MHz DDR4
Alienware M15 R5 Ports
Nvidia GeForce
RTX 3070
8GB GDDR6
Released in
2020
16:9 4K UHD
15.6”
2160p 60Hz
Weight
4.1 lb
1.86 kg
Up to
AMD Ryzen 9-4900H
8C/16T, 3.30 → 4.40 GHz
Geekbench 5
1,137
Single Core
Geekbench 5
6,806
Multi-Core
With integrated
AMD Radeon™ Graphics
8 Graphics Cores, 1750 MHz
Upgradable up to
32GB
3200 MHz DDR4
NVIDIA GeForce
RTX 2060
6GB GDDR6 with Max-Q

Comparison Summary

Alienware M15 R5 vs. Lenovo Legion Slim 7 (15”, AMD, 2020)

Dell has released the Alienware M15 R5, a 15.6-inch machine, in early-2021. It is powered by up to an octa-core AMD Ryzen 9-5900HX with a boost clock speed up to 4.60 GHz. The laptop has a dedicated GPU option up to Nvidia GeForce RTX 3070 with 8GB GDDR6.

On the other hand, we have the 15.6-inch Legion Slim 7 (15”, AMD, 2020) was introduced by Lenovo about a year earlier in 2020. It comes with up to an octa-core AMD Ryzen 9-4900H with a boost clock speed up to 4.40 GHz. It has a dedicated GPU option up to NVIDIA GeForce RTX 2060 with 6GB GDDR6 with Max-Q.

Geekbench 5 Single Core

Alienware M15 R51
AMD Ryzen™ 7 5800H1,33494.21%
2
AMD Ryzen™ 9 5900HX1,416100.00%
Lenovo Legion Slim 7 (15”, AMD, 2020)1
AMD Ryzen™ 5 4600H98769.70%
2
AMD Ryzen™ 7 4800H1,07876.13%
3
AMD Ryzen™ 9 4900H1,13780.30%
01,416

Geekbench 5 Multi Core

Alienware M15 R51
AMD Ryzen™ 7 5800H7,09892.63%
2
AMD Ryzen™ 9 5900HX7,663100.00%
Lenovo Legion Slim 7 (15”, AMD, 2020)1
AMD Ryzen™ 5 4600H4,90864.05%
2
AMD Ryzen™ 7 4800H6,44084.04%
3
AMD Ryzen™ 9 4900H6,80688.82%
07,663

Both Alienware M15 R5 and Lenovo Legion Slim 7 (15”, AMD, 2020) have the same 15.6-inch display size. In addition, the Alienware M15 R5 weighs 5.34 lbs. about 30% heavier than the 4.1 lbs. Lenovo Legion Slim 7 (15”, AMD, 2020). Moreover, measured at 14.02” x 10.73” x 0.76”, the Alienware M15 R5 is considerably bulkier than the Lenovo Legion Slim 7 (15”, AMD, 2020) at 14.01” x 9.84” x 0.7”.

Alienware M15 R5Lenovo Legion Slim 7 (15”, AMD, 2020)

Moving over to upgradability, Dell claims that the Alienware M15 R5 supports up to 32GB 3200 MHz DDR4 memory that you can upgrade with two memory module slots on the motherboard. It also comes with two M.2 slots that users can easily upgrade and install an additional SSD to expand the storage on the device.

For Lenovo Legion Slim 7 (15”, AMD, 2020), it supports up to 32GB 3200 MHz DDR4 memory that you can upgrade with memory module slots on the motherboard. It also has two M.2 slots that users can easily swap or add an extra SSD to get extra space when needed.

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