| Attribute |
HP EliteBook 840 G2 (L9A86PA) × | 
Lenovo ThinkPad X1 Carbon (20BTS0W70E) × |
| General | | |
| Model | HP EliteBook 840 G2 | Lenovo ThinkPad X1 Carbon |
| Product code | L9A86PA | 20BTS0W70E |
| Design | | |
| Product colour | Silver | Black |
| Form factor | Clamshell | Clamshell |
| Brand | HP | Lenovo |
| Family | EliteBook | ThinkPad |
| Series | 800 | X |
| Model name | 840 G2 | X1 Carbon |
| Part number | L9A86PA | 20BTS0W70E |
| Release year (year) | 2015 | 2018 |
| Processor | | |
| Processor family | 5th gen Intel Core i7 | 5th gen Intel Core i5 |
| Processor frequency (GHz) | 2.6 | 2.3 |
| Processor boost frequency (GHz) | 3.2 | 2.9 |
| Processor model | i7-5600U | i5-5300U |
| Processor cores | 2 | 2 |
| Processor threads | 4 | 4 |
| Processor lithography (Nm) | 14 | 14 |
| Processor socket | BGA 1168 | BGA 1168 |
| Processor cache (MB) | 4 | 3 |
| Memory | | |
| Internal memory type | DDR3L-SDRAM | DDR3L-SDRAM |
| Maximum internal memory (GB) | - | 8 |
| Memory clock speed (MHz) | 1,600 | 1,600 |
| Internal memory (GB) | 8 | 8 |
| Display | | |
| Display diagonal (inch) | 14 | 14 |
| Panel type | - | IPS |
| HD type | Full HD | Wide Quad HD |
| LED backlight | + | + |
| Touchscreen | - | + |
| Display resolution | 1920 x 1080 pixels | 2560 x 1440 pixels |
| Graphics | | |
| On-board graphics adapter | + | + |
| Discrete graphics adapter model | AMD Radeon R7 M260X | - |
| Discrete graphics memory type | GDDR5 | - |
| Discrete graphics adapter | + | - |
| On-board graphics adapter base frequency (MHz) | 300 | 300 |
| Maximum on-board graphics adapter memory (GB) | 16 | 16 |
| On-board graphics adapter model | Intel HD Graphics 5500 | Intel HD Graphics 5500 |
| Storage | | |
| Total storage capacity (GB) | 256 | 240 |
| Number of SSDs installed | 1 | 1 |
| SSD capacity (GB) | 256 | 240 |
| Card reader integrated | + | - |
| Storage media | SSD | SSD |
| Optical drive | - | - |
| Networking | | |
| Wi-Fi standards | - 802.11a
- 802.11b
- 802.11g
- wi-fi 4 (802.11n)
- wi-fi 5 (802.11ac)
| - |
| Bluetooth | + | + |
| Ethernet LAN | + | - |
| Ethernet LAN data rates (Mbit/s) | | - |
| Wi-Fi | + | + |
| 4g | - | - |
| 3g | - | - |
| Bluetooth version | 4.0 | 4.0 |
| Ports and interfaces | | |
| USB 3.x Type-A ports | 4 | 2 |
| Combo headphone/mic port | + | + |
| Docking connector | + | + |
| USB Sleep-and-Charge | - | + |
| DVI port | - | - |
| HDMI ports quantity | - | 1 |
| Ethernet LAN (RJ-45) ports | 1 | - |
| Audio | | |
| Speaker power (W) | - | 1 |
| Built-in microphone | + | + |
| Camera | | |
| Front camera | + | + |
| Keyboard | | |
| Numeric keypad | - | - |
| Keyboard backlit | + | + |
| Pointing device | - | ThinkPad UltraNav |
| Software | | |
| Operating system installed | Windows 7 Professional | Windows 8.1 Pro |
| Operating system architecture (bit) | 64 | 64 |
| Battery | | |
| Battery capacity (watt-hours) (Wh) | 50 | 50 |
| Weight and dimensions | | |
| Weight (kg) | 1.55 | 1.44 |
| Height (mm) | 21 | 18.5 |
| Depth (mm) | 237 | 227.1 |
| Width (mm) | 339 | 331 |
| Security | | |
| Cable lock slot | + | + |
| Fingerprint reader | + | + |
| Trusted platform module (TPM) | + | - |