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ASUS ZenBook S UX391

Laptop specifications

ASUS ZenBook S UX391 photo 1
ASUS ZenBook S UX391 photo 2
ASUS ZenBook S UX391 photo 3

Images copyright: ASUS


Battery 50 Wh 4-cell Li-Ion
Battery Life 19.4 h
Charger 65 W USB Type-C
Color Deep Dive Blue
Dimensions 311.0mm x 213.0mm x 12.9mm
Keyboard Backlit chiclet keyboard, 1.2mm travel
Material Magnesium and aluminum alloy
Touchpad NumberPad 2.0
Weight 1.05 kg


CPU Intel Core i5-8250U
Intel Core i5-8265U
Intel Core i7-8550U
Intel Core i7-8565U
GPU Intel UHD Graphics 620
Intel Optane Yes, optional
Operating System Windows 10 Home
Windows 10 Pro
RAM Clock 2133 MHz
RAM Maximum 8 GB
16 GB
RAM Slots 0
Storage PCIe 3.0 x4 NVMe SSD
Storage Replaceable Yes


Audio Harman Kardon
Camera Yes, HD
Microphone Yes
Screen Brightness 300 nits
350 nits
450 nits
Screen Resolution 1920 x 1080
3840 x 2160
Screen Size 13.3"
Screen Type IPS
Touchscreen Yes, optional
Windows Hello Yes


3.5mm Yes, universal
Bluetooth 4.2
Card Reader No
Fingerprint reader Yes
HDMI 1 x 1.4b
Optical Drive No
RJ45 No
Thunderbolt 4 2 x
USB 2 x USB 3.2 Gen 2 Type-C
1 x USB 3.2 Gen 1 Type-C
Wi-Fi 802.11b,g,n

ASUS ZenBook S UX391 frequently asked questions

Can you upgrade or replace the RAM in ASUS ZenBook S UX391?
No, unfortunately the RAM is soldered to the motherboard in ASUS ZenBook S UX391. However, you can choose a model with 8 GB or 16 GB of LPDDR3 memory.