| Attribute |
ASUS ZenBook UX331UN-C4136R (UX331UN-C4136R-CASE) × | 
ASUS VivoBook X405UQ-BV335R (X405UQ-BV335R) × |
| General | | |
| Model | ASUS ZenBook UX331UN-C4136R | ASUS VivoBook X405UQ-BV335R |
| Product code | UX331UN-C4136R-CASE | X405UQ-BV335R |
| Design | | |
| Form factor | Clamshell | Clamshell |
| Brand | ASUS | ASUS |
| Family | ZenBook | VivoBook |
| Series | 13 | - |
| Model name | UX331UN-C4136R | X405UQ-BV335R |
| Part number | UX331UN-C4136R-CASE | X405UQ-BV335R |
| Release year (year) | 2018 | 2018 |
| Processor | | |
| Processor family | 8th gen Intel Core i5 | 7th gen Intel Core i5 |
| Processor frequency (GHz) | 1.6 | 2.5 |
| Processor boost frequency (GHz) | 3.4 | 3.1 |
| Processor model | i5-8250U | i5-7200U |
| Processor cores | 4 | 2 |
| Processor threads | 8 | 4 |
| Processor lithography (Nm) | 14 | 14 |
| Processor socket | BGA 1356 | BGA 1356 |
| Processor cache (MB) | 6 | 3 |
| Memory | | |
| Internal memory type | - | DDR4-SDRAM |
| Maximum internal memory (GB) | 8 | 16 |
| Internal memory (GB) | 8 | 8 |
| Display | | |
| Display diagonal (inch) | 13.3 | 14 |
| HD type | Full HD | - |
| LED backlight | + | + |
| Touchscreen | + | - |
| Display resolution | 1920 x 1080 pixels | 1366 x 768 pixels |
| Graphics | | |
| On-board graphics adapter | + | + |
| Discrete graphics adapter model | NVIDIA GeForce MX150 | NVIDIA GeForce 940MX |
| Discrete graphics memory type | GDDR5 | GDDR5 |
| Discrete graphics adapter | + | + |
| Discrete graphics adapter memory (GB) | 2 | 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 HD Graphics 620 |
| Storage | | |
| Total storage capacity (GB) | 256 | 256 |
| Card reader integrated | + | + |
| SSD form factor | M.2 | - |
| Storage media | SSD | SSD |
| Optical drive | - | - |
| Networking | | |
| Wi-Fi standards | | |
| Bluetooth | + | + |
| Ethernet LAN | - | + |
| Wi-Fi | + | + |
| 4g | - | - |
| 3g | - | - |
| Bluetooth version | 4.2 | 4.2 |
| Ports and interfaces | | |
| USB 3.x Type-A ports | 2 | 1 |
| USB 3.x Type-C ports | 1 | 1 |
| Combo headphone/mic port | + | + |
| USB 2.0 ports | - | 2 |
| HDMI ports quantity | 1 | 1 |
| Ethernet LAN (RJ-45) ports | - | 1 |
| Audio | | |
| Speaker power (W) | 1 | - |
| Camera | | |
| Front camera | + | + |
| Keyboard | | |
| Numeric keypad | - | - |
| Pointing device | Touchpad | Touchpad |
| Software | | |
| Operating system installed | Windows 10 Pro | Windows 10 Pro |
| Operating system architecture (bit) | 64 | 64 |
| Battery | | |
| Battery capacity (watt-hours) (Wh) | 50 | 42 |
| Weight and dimensions | | |
| Weight (kg) | 1.12 | 1.3 |
| Height (mm) | 13.9 | - |
| Depth (mm) | 216 | 225.5 |
| Width (mm) | 310 | 326.4 |
| Power | | |
| AC adapter power (W) | 65 | 65 |
| Security | | |
| Cable lock slot | + | - |
| Trusted platform module (TPM) | + | - |