| Attribute |
ASUS VivoBook X542UR-DM399 (X542UR-DM399) × | 
ASUS K540UA-Q51P-CB (K540UA-Q51P-CB) × |
| General | | |
| Model | ASUS VivoBook X542UR-DM399 | ASUS K540UA-Q51P-CB |
| Product code | X542UR-DM399 | K540UA-Q51P-CB |
| Design | | |
| Product colour | - | Black, Chocolate |
| Form factor | Clamshell | Clamshell |
| Brand | ASUS | ASUS |
| Family | VivoBook | - |
| Model name | X542UR-DM399 | K540UA-Q51P-CB |
| Part number | X542UR-DM399 | K540UA-Q51P-CB |
| Release year (year) | 2018 | 2019 |
| Processor | | |
| Processor family | 8th gen Intel Core i7 | 8th gen Intel Core i5 |
| Processor frequency (GHz) | 1.8 | 1.6 |
| Processor boost frequency (GHz) | 4 | 3.4 |
| Processor model | i7-8550U | i5-8250U |
| Processor cores | 4 | 4 |
| Processor threads | 8 | 8 |
| Processor lithography (Nm) | 14 | 14 |
| Processor socket | BGA 1356 | BGA 1356 |
| Processor cache (MB) | 8 | 6 |
| Memory | | |
| Internal memory type | DDR4-SDRAM | DDR4-SDRAM |
| Maximum internal memory (GB) | 16 | 12 |
| Memory clock speed (MHz) | 2,133 | 2,133 |
| Internal memory (GB) | 8 | 8 |
| Display | | |
| Display diagonal (inch) | 15.6 | 15.6 |
| HD type | Full HD | Full HD |
| LED backlight | + | + |
| Touchscreen | - | - |
| Dual-screen | - | - |
| Display resolution | 1920 x 1080 pixels | 1920 x 1080 pixels |
| Graphics | | |
| On-board graphics adapter | + | + |
| Discrete graphics adapter model | NVIDIA GeForce 930MX | - |
| Discrete graphics memory type | GDDR5 | - |
| Discrete graphics adapter | + | - |
| Discrete graphics adapter memory (GB) | 2 | - |
| On-board graphics adapter base frequency (MHz) | 300 | 300 |
| Maximum on-board graphics adapter memory (GB) | 32 | 32 |
| On-board graphics adapter model | Intel UHD Graphics 620 | Intel UHD Graphics 620 |
| Storage | | |
| Total storage capacity (GB) | 1,000 | 1,000 |
| Card reader integrated | + | + |
| Storage media | HDD | Hybrid-HDD |
| Networking | | |
| Wi-Fi standards | | |
| Bluetooth | - | + |
| Ethernet LAN | + | - |
| Wi-Fi | + | + |
| 4g | - | - |
| 3g | - | - |
| Bluetooth version | - | 4.0 |
| Ports and interfaces | | |
| USB 3.x Type-A ports | 2 | 1 |
| USB 3.x Type-C ports | 1 | - |
| Combo headphone/mic port | + | + |
| USB 2.0 ports | 1 | 2 |
| HDMI ports quantity | 1 | 1 |
| Ethernet LAN (RJ-45) ports | 1 | - |
| Audio | | |
| Speaker power (W) | 1.5 | - |
| Built-in microphone | + | + |
| Camera | | |
| Front camera | + | + |
| Keyboard | | |
| Numeric keypad | + | + |
| Pointing device | Touchpad | Touchpad |
| Software | | |
| Operating system installed | Endless OS | Windows 10 Pro |
| Battery | | |
| Battery capacity (watt-hours) (Wh) | 38 | 33 |
| Weight and dimensions | | |
| Weight (kg) | 2.15 | 1.9 |
| Height (mm) | 23.2 | 27.2 |
| Depth (mm) | 251 | 251 |
| Width (mm) | 380 | 381 |
| Power | | |
| AC adapter power (W) | 65 | 45 |