| Attribute |
Lenovo ThinkPad X250 (20CLS59400) × | 
Lenovo ThinkPad X1 Carbon (20BTA07BCD) × |
| General | | |
| Model | Lenovo ThinkPad X250 | Lenovo ThinkPad X1 Carbon |
| Product code | 20CLS59400 | 20BTA07BCD |
| Design | | |
| Product colour | Black | Black |
| Form factor | Clamshell | Clamshell |
| Brand | Lenovo | Lenovo |
| Family | ThinkPad | ThinkPad |
| Series | X | X |
| Model name | X250 | X1 Carbon |
| Part number | 20CLS59400 | 20BTA07BCD |
| Release year (year) | 2018 | 2018 |
| Processor | | |
| Processor manufacturer | Intel | Intel |
| Processor family | 5th gen Intel Core i7 | 5th gen Intel Core i5 |
| Processor frequency (GHz) | 2.6 | 2.2 |
| Processor boost frequency (GHz) | 3.2 | 2.7 |
| Processor model | i7-5600U | i5-5200U |
| 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) | 16 | 4 |
| Memory clock speed (MHz) | 1,600 | 1,600 |
| Internal memory (GB) | 8 | 4 |
| Display | | |
| Display diagonal (inch) | 12.5 | 14 |
| 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 | - | - |
| 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 | 256 |
| Number of SSDs installed | 1 | 1 |
| SSD capacity (GB) | 256 | 256 |
| Card reader integrated | + | - |
| Storage media | SSD | SSD |
| Optical drive | - | - |
| Networking | | |
| Wi-Fi standards | - | - 802.11b
- 802.11g
- wi-fi 4 (802.11n)
|
| Bluetooth | + | + |
| Ethernet LAN | + | - |
| Ethernet LAN data rates (Mbit/s) | | - |
| Wi-Fi | + | + |
| Bluetooth version | 4.0 | 4.0 |
| Ports and interfaces | | |
| USB 3.x Type-A ports | 2 | 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) | 1.5 | 1 |
| Built-in microphone | + | + |
| Camera | | |
| Front camera | + | + |
| Keyboard | | |
| Numeric keypad | - | - |
| Keyboard backlit | - | + |
| Full-size keyboard | + | - |
| Pointing device | ThinkPad UltraNav | ThinkPad UltraNav |
| Software | | |
| Operating system installed | Windows 8.1 Pro | Windows 7 Home Basic |
| Operating system architecture (bit) | 64 | 64 |
| Weight and dimensions | | |
| Weight (kg) | - | 1.27 |
| Height (mm) | 20.3 | 17.7 |
| Depth (mm) | 208.5 | 226 |
| Width (mm) | 305.5 | 331 |
| Security | | |
| Cable lock slot | + | + |
| Fingerprint reader | - | + |