In depth comparison and review of ASUS ZenBook S UX391UA (ET087T) and ASUS Vivobook 14X (K3405ZF). Compare sizes, performance, storage capacities, batteries and other important specifications and features to easily choose the right laptop for you. Our goal is to help you uncover differences between the products and find the laptop that will best fit your needs.
Advantages and disadvantages of ASUS ZenBook S UX391UA (ET087T) based on its technical characteristics, features, user experience, expert reviews and price level.
affordable price
solid build quality
decent processor performance
ample storage capacity
good keyboard layout
average display quality
no backlit keyboard
limited graphics performance
mediocre battery life
Advantages and disadvantages of ASUS Vivobook 14X (K3405ZF) based on its technical characteristics, features, user experience, expert reviews and price level.
powerful intel processor
lightweight and portable
vivid oled display
fast ssd storage
competitive price point
average battery life
limited port selection
no dedicated gpu
standard design
| DESIGN AND DIMENSIONS | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Product Type | Notebook | Notebook - 180-degree hinge design |
|---|---|---|
| Dimensions (WxDxH) | 31.1 cm x 21.3 cm x 1.29 cm | 31.71 cm x 22.25 cm x 1.89 cm |
| Weight | 1 kg | 1.4 kg |
| Case Material | - | Aluminum |
| Colour | Deep dive blue | Cool silver |
| DISPLAY | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Screen Size (Type) | 13.3" | 14" - IPS |
|---|---|---|
| LCD Backlight Technology | LED backlight | - |
| Screen Resolution | 1920 x 1080 (Full HD) | 1920 x 1200 (WUXGA) |
| Widescreen | Yes | Yes |
| Image Aspect Ratio | 16:9 | 16:10 |
| Image Brightness | 300 cd/m² | 300 cd/m² |
| Colour Gamut | 72% NTSC | 45% NTSC |
| Features | Ultra Slim Design, anti-glare, WideView, 178° horizontal and vertical viewing angle | Glossy |
| PROCESSOR | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| CPU | Intel Core i7 (8th Gen) 8550U / 1.8 GHz | Intel Core i5 (12th Gen) 12450H / 2 GHz |
|---|---|---|
| Max Turbo Speed | 4 GHz | 4.4 GHz |
| Number of Cores | Quad-Core | 8-core |
| Cache | 8 MB | L3 - 12 MB |
| 64-bit Computing | Yes | - |
| Features | Intel Turbo Boost Technology 2.0 | Intel Smart Cache |
| MEMORY | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| RAM | 8 GB (provided memory is soldered) | 16 GB (1 x 8 GB + 8 GB (soldered)) |
|---|---|---|
| Max RAM Supported | - | 16 GB |
| RAM Type | LPDDR3 SDRAM | DDR4 SDRAM |
| Speed | 2133 MHz | - |
| Rated Speed | 2133 MHz | - |
| Form Factor | - | SO-DIMM 260-pin |
| Slots Qty | - | 1 |
| Empty Slots | - | 0 |
| STORAGE | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Main Storage Size (HDD/SSD) | 256 GB SSD M.2 SATA 6Gb/s | 512 GB SSD M.2 PCIe 3.0 - NVM Express (NVMe) |
|---|
| AUDIO & VIDEO | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Multi-GPU Configuration | - | 1 single GPU card / integrated GPU |
|---|---|---|
| Graphics Processor (GPU) | Intel UHD Graphics 620 | NVIDIA GeForce RTX 2050 / Intel UHD Graphics |
| Video Memory | - | 4 GB GDDR6 SDRAM |
| Camera | Yes - HD | Yes - HD |
| Camera Features | - | Privacy shutter |
| Sound | Harman/kardon stereo speakers, array microphone | Dual speakers, microphone |
| Audio Features | ASUS SonicMaster | Output: ASUS SonicMaster, Audio by Dirac, Asus Audio Booster |
| COMMUNICATIONS | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Wireless | 802.11a/b/g/n/ac, Bluetooth 4.2 | 802.11a/b/g/n/ac/ax (Wi-Fi 6E), Bluetooth 5.3 |
|---|---|---|
| Features | - | Single stream (1x1) |
| BATTERY | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Technology | 4-cell | 3-cell Lithium Ion |
|---|---|---|
| Battery Capacity (Size) | 50 Wh | 50 Wh |
| Battery Life | Up to 13.5 hours | - |
| AC ADAPTER | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Input | AC 120/230 V (50/60 Hz) | AC 100-240 V (50/60 Hz) |
|---|---|---|
| Output | 65 Watt, 20 V | 90 Watt, 19 V, 4.74 A |
| INPUT | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Type | Keyboard, touchpad | Keyboard, touchpad |
|---|---|---|
| Keyboard Backlight | Yes | Yes |
| Features | - | 1.4mm travel distance, ASUS ErgoSense |
| CONNECTIONS & EXPANSIONS | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Interfaces | Headphone/microphone combo jack USB-C 3.1 Gen 1 (Power Delivery/data/video) 2 x USB-C 3.1 Gen 2 (supports Thunderbolt 3) (Power Delivery/data/video) |
HDMI 2.1 Headphone/microphone combo jack 2 x USB 3.2 Gen 1 USB-C 3.2 Gen 1 (Power Delivery) |
|---|
| SOFTWARE | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Operating System (OS) | Windows 10 Home | Windows 11 Home |
|---|---|---|
| Software Included | - | MyASUS, ScreenXpert, GlideX |
| MISCELLANEOUS | ASUS ZenBook S UX391UA (ET087T) | ASUS Vivobook 14X (K3405ZF) |
|---|
| Included Accessories | USB-C power adapter | Power adapter, wired mouse, Carry bag |
|---|---|---|
| Security | Firmware Trusted Platform Module (TPM) Security Chip | Firmware Trusted Platform Module (TPM) Security Chip |
| Features | - | ASUS IceCool design, MIL-STD-810H tested |
| Compliant Standards | - | RoHS, REACH |
| Model Number | - | LY134W |
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