| Attribute |
DELL Latitude E6540 (E6540-NL-SB25) × | 
Lenovo ThinkPad W540 (20BH002CMD) × |
| General | | |
| Model | DELL Latitude E6540 | Lenovo ThinkPad W540 |
| Product code | E6540-NL-SB25 | 20BH002CMD |
| Design | | |
| Product colour | Black, Silver | Black |
| Form factor | Clamshell | Clamshell |
| Brand | DELL | Lenovo |
| Family | Latitude | ThinkPad |
| Series | 6000 | W |
| Model name | E6540 | W540 |
| Part number | E6540-NL-SB25 | 20BH002CMD |
| Market positioning | Business | - |
| Release year (year) | 2020 | 2013 |
| Processor | | |
| Processor manufacturer | Intel | - |
| Processor family | 4th gen Intel Core i7 | 4th gen Intel Core i7 |
| Processor frequency (GHz) | 2.8 | 2.7 |
| Processor boost frequency (GHz) | 3.8 | 3.7 |
| Processor model | i7-4810MQ | i7-4800MQ |
| Processor cores | 4 | 4 |
| Processor threads | 8 | 8 |
| Processor lithography (Nm) | 22 | 22 |
| Processor socket | - | PGA946 |
| Processor cache (MB) | 6 | 6 |
| Memory | | |
| Internal memory type | DDR3-SDRAM | DDR3-SDRAM |
| Maximum internal memory (GB) | 16 | 32 |
| Memory clock speed (MHz) | 1,600 | 1,600 |
| Internal memory (GB) | 8 | 8 |
| Display | | |
| Display diagonal (inch) | 15.6 | 15.6 |
| HD type | Full HD | Full HD |
| LED backlight | + | + |
| Touchscreen | - | - |
| Display resolution | 1920 x 1080 pixels | 1920 x 1080 pixels |
| Graphics | | |
| On-board graphics adapter | + | + |
| Discrete graphics adapter model | - | NVIDIA Quadro K1100M |
| Discrete graphics adapter | - | + |
| Discrete graphics adapter memory (GB) | - | 2 |
| On-board graphics adapter base frequency (MHz) | 400 | 400 |
| Maximum on-board graphics adapter memory (GB) | 74 | 74 |
| On-board graphics adapter model | Intel HD Graphics 4600 | Intel HD Graphics 4600 |
| Storage | | |
| Total storage capacity (GB) | 240 | 180 |
| Number of SSDs installed | 1 | 1 |
| SSD capacity (GB) | 240 | 180 |
| Card reader integrated | + | + |
| Storage media | SSD | SSD |
| Optical drive | + | + |
| Networking | | |
| Wi-Fi standards | - 802.11b
- 802.11g
- wi-fi 4 (802.11n)
| - ieee 802.11a
- ieee 802.11ac
- ieee 802.11b
- ieee 802.11g
- ieee 802.11n
|
| Bluetooth | + | + |
| Ethernet LAN | + | + |
| Ethernet LAN data rates (Mbit/s) | | |
| Wi-Fi | - | + |
| 3g | - | - |
| Bluetooth version | 4.0 | 4.0 |
| Ports and interfaces | | |
| USB 3.x Type-A ports | 4 | 2 |
| Combo headphone/mic port | + | + |
| USB 2.0 ports | - | 2 |
| Docking connector | + | + |
| USB Sleep-and-Charge | - | + |
| DVI port | - | - |
| HDMI ports quantity | 1 | - |
| Ethernet LAN (RJ-45) ports | 1 | 1 |
| Audio | | |
| Speaker power (W) | - | 1 |
| Built-in microphone | + | + |
| Camera | | |
| Front camera | + | + |
| Front camera resolution (pixels) | 1280 x 720 | 1280 x 720 |
| Keyboard | | |
| Numeric keypad | + | + |
| Keyboard backlit | - | + |
| Pointing device | Touchpad | - |
| Software | | |
| Operating system installed | Windows 10 Pro | Windows 8 Pro |
| Operating system architecture (bit) | 64 | 64 |
| Battery | | |
| Battery capacity (watt-hours) (Wh) | 65 | 99 |
| Battery life (max) (h) | - | 11.1 |
| Weight and dimensions | | |
| Weight (kg) | 2.56 | 2.7 |
| Height (mm) | 33.4 | - |
| Depth (mm) | 250.5 | 248.1 |
| Width (mm) | 379 | 376.6 |
| Power | | |
| AC adapter power (W) | 130 | 170 |
| Security | | |
| Cable lock slot | + | - |
| Fingerprint reader | - | + |
| Trusted platform module (TPM) | - | + |