In depth comparison and review of Lenovo ThinkPad E15 Gen 4 (21ED) and Lenovo IdeaPad S540-13IML (81XA). Compare sizes, performance, storage capacities, batteries and other important specifications and features to easily choose the right laptop for you. Our goal is to help you uncover differences between the products and find the laptop that will best fit your needs.
Advantages and disadvantages of Lenovo ThinkPad E15 Gen 4 (21ED) based on its technical characteristics, features, user experience, expert reviews and price level.
robust build quality
efficient performance
comfortable keyboard
good security features
affordable price
average display quality
limited graphics power
moderate battery life
noisy under load
Advantages and disadvantages of Lenovo IdeaPad S540-13IML (81XA) based on its technical characteristics, features, user experience, expert reviews and price level.
sleek aluminum design
sharp QHD display
impressive battery life
fast charging support
lightweight and portable
limited port selection
no dedicated GPU
average speaker quality
higher price segment
| DESIGN AND DIMENSIONS | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Product Type | Notebook | Notebook |
|---|---|---|
| Dimensions (WxDxH) | 36.5 cm x 24 cm x 1.89 cm | 29.69 cm x 20.85 cm x 1.595 cm |
| Weight | 1.78 kg | 1.25 kg |
| Case Material | Aluminium (top), polycarbonate ABS (bottom) | Aluminum, glass |
| Colour | Black | Light silver |
| DISPLAY | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Screen Size (Type) | 15.6" - IPS | 13.3" |
|---|---|---|
| LCD Backlight Technology | LED backlight | LED backlight |
| Screen Resolution | 1920 x 1080 (Full HD) | 2560 x 1600 (WQXGA) |
| Widescreen | Yes | Yes |
| Image Aspect Ratio | 16:9 | 16:10 |
| Image Brightness | 300 cd/m² | 300 cd/m² |
| Colour Gamut | - | 100% sRGB |
| Features | Anti-glare, 170° viewing angle | Glossy, Wide Viewing Angle |
| PROCESSOR | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| CPU | AMD Ryzen 5 5625U / 2.3 GHz | Intel Core i5 (10th Gen) 10210U / 1.6 GHz |
|---|---|---|
| Max Turbo Speed | 4.3 GHz | 4.2 GHz |
| Number of Cores | 6-core | Quad-Core |
| Cache | L3 - 16 MB | 6 MB |
| 64-bit Computing | - | Yes |
| Features | Integrated memory controller | Integrated memory controller |
| MEMORY | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| RAM | 8 GB (provided memory is soldered) | 8 GB (provided memory is soldered) |
|---|---|---|
| Max RAM Supported | 40 GB | - |
| RAM Type | DDR4 SDRAM | DDR4 SDRAM |
| Speed | 3200 MHz | 2666 MHz |
| Rated Speed | 3200 MHz | 2666 MHz |
| Form Factor | SO-DIMM 260-pin | - |
| Slots Qty | 1 | - |
| Empty Slots | 1 | - |
| STORAGE | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Main Storage Size (HDD/SSD) | 256 GB SSD M.2 2242 PCIe 4.0 x4 - TCG Opal Encryption 2, NVM Express (NVMe) | 256 GB SSD M.2 2280 PCIe 3.0 x4 - NVM Express (NVMe) |
|---|
| AUDIO & VIDEO | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Graphics Processor (GPU) | AMD Radeon Graphics | Intel UHD Graphics |
|---|---|---|
| Max Monitors Supported | 2 external monitor(s) | - |
| Camera | Yes - 1080p | Yes - 720p |
| Resolution | - | 1 Megapixel |
| Camera Features | Privacy shutter, IR camera, Windows Hello, fixed focus | IR camera, ToF sensor |
| Sound | Stereo speakers, dual array microphone | Stereo speakers, dual array microphone |
| Codec | Realtek ALC3287 | - |
| Compliant Standards | High Definition Audio, Dolby Audio | High Definition Audio, Dolby Audio |
| Audio Features | Harman-branded | - |
| COMMUNICATIONS | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Wireless | 802.11a/b/g/n/ac/ax, Bluetooth 5.2 | Bluetooth 5.0, 802.11a/b/g/n/ac/ax |
|---|---|---|
| Wireless Controller | M.2 Card | M.2 Card |
| Network Interface | Gigabit Ethernet | - |
| Ethernet Controller | Realtek RTL8111H-CG | - |
| Features | Wake-on-LAN (WOL), dual stream (2x2) | Dual stream (2x2) |
| BATTERY | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Technology | Lithium polymer | Lithium Ion |
|---|---|---|
| Battery Capacity (Size) | 57 Wh | 56 Wh |
| Battery Life | Up to 16.5 hours | Up to 18.5 hours |
| AC ADAPTER | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Input | AC 100-240 V (50/60 Hz) | AC 120/230 V (50/60 Hz) |
|---|---|---|
| Output | 65 Watt | 65 Watt |
| INPUT | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Type | Keyboard, TrackPoint, UltraNav | Keyboard, touchpad |
|---|---|---|
| Numeric Keypad | Yes | - |
| Keyboard Backlight | Yes | Yes |
| Features | Spill-resistant, multi-touch touchpad, Fn keys with Unified Communications controls | Multi-touch touchpad, buttonless touchpad |
| CONNECTIONS & EXPANSIONS | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Slots | 2 x M.2 Card (1 free) | - |
|---|---|---|
| Interfaces | USB 2.0 USB 3.2 Gen 1 (Always On) USB-C 3.2 Gen 1 (supports DisplayPort 1.2 Alt Mode) (Power Delivery 3.0) HDMI LAN Headphone/microphone combo jack |
USB 3.1 Gen 1 (Always On) 2 x USB-C 3.1 Gen 1 (supports DisplayPort Alt Mode) (Power Delivery) Headphone/microphone combo jack |
| SOFTWARE | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Operating System (OS) | Windows 11 Pro - English | Windows 10 Home 64-bit Edition - English |
|---|---|---|
| Software Included | - | Microsoft Office (30 days trial) |
| MISCELLANEOUS | Lenovo ThinkPad E15 Gen 4 (21ED) | Lenovo IdeaPad S540-13IML (81XA) |
|---|
| Included Accessories | USB-C power adapter | Power adapter |
|---|---|---|
| Security | Discrete Trusted Platform Module (TPM 2.0) Security Chip, fingerprint reader | Firmware Trusted Platform Module (TPM 2.0) Security Chip |
| Security Slot Type | Kensington security slot | - |
| Theft/Intrusion Protection | Security lock slot (cable lock sold separately) | - |
| Features | Administrator password, power-on password, MIL-STD-810H tested, self-healing BIOS, NVMe password | Administrator password, hard drive password, power-on password, RapidCharge |
| Compliant Standards | RoHS, Energy-Related Products (ErP) Lot 3, TCG Certified, TUV Rheinland Low Blue Light (Software Solution) | RoHS, Energy-Related Products (ErP) Lot 3 |
| SAR Value | - | 0.599 W/kg (body), 0.599 W/kg (limb) |
| ENERGY STAR Certified | Yes | - |
| EPEAT Compliant | EPEAT Gold | - |
| Specific Absorption Rate (SAR) | - | 0.599 W/kg (body) 0.599 W/kg (limb) |
| Max Operating Temperature | 35 °C | - |
| Min Operating Temperature | 5 °C | - |
| Humidity Range Operating | 8 - 95% | - |
| Manufacturer Warranty | Base warranty - 1 year - pick-up and return Extended warranty - 1 year - on-site |
Limited warranty - 1 year - pick-up and return |
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