| Attribute |
ASUS ZenBook UX391UA-EG026T (90NB0D91-M01070) × | 
ASUS ZenBook UX490UA-BE010R-OSS (UX490UA-BE010R-OSS) × |
| General | | |
| Model | ASUS ZenBook UX391UA-EG026T | ASUS ZenBook UX490UA-BE010R-OSS |
| Product code | 90NB0D91-M01070 | UX490UA-BE010R-OSS |
| Design | | |
| Product colour | Blue | - |
| Form factor | Clamshell | Clamshell |
| Brand | ASUS | ASUS |
| Family | ZenBook | ZenBook |
| Series | S | 3 Deluxe |
| Model name | UX391UA-EG026T | UX490UA-BE010R-OSS |
| Part number | 90NB0D91-M01070 | UX490UA-BE010R-OSS |
| Release year (year) | 2018 | 2017 |
| Processor | | |
| Processor family | 8th gen Intel Core i7 | 7th gen Intel Core i7 |
| Processor frequency (GHz) | 1.8 | 2.7 |
| Processor boost frequency (GHz) | 4 | 3.5 |
| Processor model | i7-8550U | i7-7500U |
| Processor cores | 4 | 2 |
| Processor threads | 8 | 4 |
| Processor lithography (Nm) | 14 | 14 |
| Processor socket | BGA 1356 | BGA 1356 |
| Processor cache (MB) | 8 | 4 |
| Memory | | |
| Internal memory type | LPDDR3-SDRAM | LPDDR3-SDRAM |
| Maximum internal memory (GB) | 16 | 16 |
| Memory clock speed (MHz) | 2,133 | 2,133 |
| Internal memory (GB) | 16 | 16 |
| Display | | |
| Display diagonal (inch) | 13.3 | 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) | 32 | 32 |
| On-board graphics adapter model | Intel UHD Graphics 620 | Intel HD Graphics 620 |
| Storage | | |
| Total storage capacity (GB) | 1,000 | 1,024 |
| Storage media | SSD | SSD |
| Optical drive | - | - |
| Networking | | |
| Wi-Fi standards | | |
| Bluetooth | + | + |
| Ethernet LAN | - | - |
| Wi-Fi | + | + |
| 4g | - | - |
| 3g | - | - |
| Bluetooth version | 4.2 | 4.1 |
| Ports and interfaces | | |
| USB 3.x Type-C ports | 1 | 1 |
| Combo headphone/mic port | + | + |
| Docking connector | - | - |
| DVI port | - | - |
| USB Type-C thunderbolt 3 ports | - | 2 |
| Camera | | |
| Front camera | + | + |
| Keyboard | | |
| Numeric keypad | - | - |
| Pointing device | Touchpad | Touchpad |
| Software | | |
| Operating system installed | Windows 10 Home | Windows 10 Pro |
| Operating system architecture (bit) | 64 | 64 |
| Battery | | |
| Battery capacity (watt-hours) (Wh) | 50 | 46 |
| Battery life (max) (h) | 13.5 | 12 |
| Weight and dimensions | | |
| Weight (kg) | 1 | 1.1 |
| Height (mm) | 12.9 | 12.9 |
| Depth (mm) | 213 | 214 |
| Width (mm) | 311 | 329 |
| Power | | |
| AC adapter power (W) | 65 | 65 |
| Security | | |
| Fingerprint reader | - | + |
| Trusted platform module (TPM) | - | + |