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Asus ZenBook S UX391U


Asus ZenBook S UX391U
Asus ZenBook S UX391U (ZenBook S UX391U Series)
Intel Core i7-8550U 4 x 1.8 - 4 GHz, Kaby Lake Refresh
Graphics adapter
Intel UHD Graphics 620, Core: 1150 MHz, Memory: 1066 MHz,
8 GB 
, LPDDR3-2133, soldered
13.30 inch 16:9, 1920 x 1080 pixel 166 PPI, AUO B133HAN04.9, IPS, glossy: no
Intel Kaby Lake-U iHDCP 2.2 Premium PCH
Samsung PM961 NVMe MZVLW512HMJP, 512 GB 
, 455 GB free
Intel Kaby Lake-U/Y PCH - High Definition Audio
1 USB 3.0 / 3.1 Gen1, 2 USB 3.1 Gen2, 2 Thunderbolt, 3 DisplayPort, Audio Connections: 3.5 mm headset, 1 Fingerprint Reader
Intel Dual Band Wireless-AC 8265 (a/b/g/n = Wi-Fi 4/ac = Wi-Fi 5/), Bluetooth 4.2
height x width x depth (in mm): 12.9 x 311 x 213 ( = 0.51 x 12.24 x 8.39 in)
50 Wh Lithium-Polymer, 4 cells, Battery runtime (according to manufacturer): 13.5 h
Operating System
Microsoft Windows 10 Home 64 Bit
Webcam: HD-Webcam
Additional features
Speakers: Stereo Harman Kardon, Asus SonicMaster Premium Audio System, Keyboard: Chiclet, Keyboard Light: yes, 65W PSU, Asus Mini Dock, Sleeve, McAfee Live Safe (trial), Office 365 (trial), Asus Tools, 12 Months Warranty
1.018 kg ( = 35.91 oz / 2.24 pounds), Power Supply: 222 g ( = 7.83 oz / 0.49 pounds)
1349 Euro



Average Score: 82.21% - good
Average of 7 scores (from 10 reviews)
price: 73%, performance: 87%, features: 72%, display: 75% mobility: 83%, workmanship: 94%, ergonomy: 87%, emissions: 94%

Reviews for the Asus ZenBook S UX391U

88.5% Asus ZenBook S UX391U (Core i7, FHD) Laptop Review | Notebookcheck
The ZenBook S (UX391) is a particularly light 13.3-inch laptop from Asus. It tips the scale at just 1 kg, but the manufacturer says the performance is not affected. We review the rival for the XPS 13.
60% Asus ZenBook S review: S is for Style, not for Substance
Source: It Pro English version
Although the Asus ZenBook S is speedy enough to satisfy, and it looks the absolute business, there are too many flaws to recommend it, including a disappointing screen and some serious thermal issues.
Single Review, online available, Medium, Date: 11/29/2018
Rating: Total score: 60%
80% ASUS ZenBook S review: Just a decent laptop
Source: Engadget English version
If you’re in the market for a traditional Windows laptop that won’t weigh you down, the ZenBook S is a solid choice. Despite its small size, it has enough power for most tasks. Battery life is a letdown, but the S is still a good option unless you need to be unplugged for a full workday at a time.
Single Review, online available, Long, Date: 11/10/2018
Rating: Total score: 80%
ASUS ZenBook S (UX391) Hands-On, Quick Review: Ultraportable A4-Sized Workhorse
Source: Unbox English version
Since ASUS’ refreshed ZenBook line is headlined by key features like crazy thin bezels, Ergolift hinges, and ScreenPads, it’s not surprising that their premium ultrabook line, the ZenBook S (UX391) gets some of that love too.
Single Review, online available, Short, Date: 09/20/2018
96% ASUS ZenBook S is a success, almost perfection (Australian review)
Source: Gadgetguy English version
ASUS ZenBook S follows the Buddha saying, “Aim for success, not perfection. Never give up because you will lose the ability to learn new things. Move forward with your life.
Single Review, online available, Medium, Date: 07/06/2018
Rating: Total score: 96% price: 80% performance: 100% workmanship: 100%
Asus Zenbook S first look – A ‘military grade’ Macbook rival
Source: Trusted Reviews English version
The Zenbook S doesn’t have the wow factor of Asus’ other Computex releases, but from what I’ve seen it looks like a solid, ultraportable Macbook rival.
Single Review, online available, Medium, Date: 06/06/2018
Hands on: Asus ZenBook S review
Source: Techradar English version
The Asus ZenBook S isn’t the world’s thinnest, most affordable or even a 100% uniquely designed laptop, but it still looks like the Ultrabook to treat yourself with right now.
Single Review, online available, Short, Date: 06/05/2018
Asus ZenBook S is the laptop you’ll actually want on your lap
Source: CNet English version
Inside, the ZenBook S is packing some pretty premium specs in that thin body, including a 13.3-inch 4K display, Intel Core i7 processor, 16GB of RAM and a 1TB SSD on the top-of-the-line model.
Single Review, online available, Very Short, Date: 06/04/2018

Foreign Reviews

80% Die Besten ihrer Art – Highend-Notebooks
Source: PC Go - 12/18 German
Comparison, , Long, Date: 12/01/2018
Rating: Total score: 80% performance: 93% features: 70% display: 60% mobility: 77%
83% Asus Zenbook S, análisis y opinión
Source: Computerhoy Spanish ES→EN version
Single Review, online available, Very Long, Date: 08/25/2018
Rating: Total score: 83%
88% Recensione ASUS ZenBook S
Source: Smart World Italian IT→EN version
Single Review, online available, Medium, Date: 07/17/2018
Rating: Total score: 88% price: 65% features: 85% display: 80% mobility: 90%


Intel UHD Graphics 620: Integrated GPU (GT2, 24 EUs) found on some Kaby-Lake-Refresh CPU models (15 W ULV series). Technically identical to the previous Kaby-Lake GPU called HD Graphics 620.

Modern games should be playable with these graphics cards at low settings and resolutions. Casual gamers may be happy with these cards.

» Further information can be found in our Comparison of Mobile Graphics Cards and the corresponding Benchmark List.

i5-8550U: Kaby-Lake-Refresh based low power quad-core processor. The four cores are clocked between 1.8 and 4 GHz (Turbo Boost) and support HyperThreading. The integrated GPU is clocked between 300 and 1,150 MHz. The SoC is manufactured in a 14nm+ FinFET process.» Further information can be found in our Comparison of Mobile Processsors.


There are hardly any tablets in this display size range anymore. For subnotebooks, on the other hand, it is the standard format.

The advantage of subnotebooks is that the entire laptop can be small and therefore easily portable. The smaller display also has the advantage of requiring less power, which further improves battery life and thus mobility. The disadvantage is that reading texts is more strenuous on the eyes. High resolutions are more likely to be found in standard laptops.

» To find out how fine a display is, see our DPI List.

Asus: ASUSTeK Computer Inc. is a major Taiwanese computer hardware manufacturer based in Taipei, founded in 1989. Under the Asus brand name, the company manufactures a wide range of products, including laptops, desktops, motherboards, graphics cards, monitors, smartphones and networking equipment, complete systems and PC components for end users.

Under the ROG (Republic of Gamers) brand name, ASUS manufactures gaming laptops known by gamers for their powerful specifications, dedicated graphics cards, high refresh rate displays and advanced cooling systems.

Beyond gaming, a wide range of notebooks are offered for different needs and budgets, from ultra-slim and lightweight ultrabooks to versatile 2-in-1 convertibles and budget-friendly options. In 2023, Asus had a 7% global market share of the PC market.

Customer satisfaction with ASUS notebooks concerns performance, the features, and the good price-performance ratio of ASUS notebooks. However, as with any brand, there are occasional reports of problems such as overheating, driver compatibility, or build quality issues.

82.21%: This rating is slightly above average, there are somewhat more devices with worse ratings. However, clear purchase recommendations look different.

» Further information can be found in our Notebook Purchase Guide.


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> Notebook / Laptop Reviews and News > Library > Asus > Asus ZenBook S UX391U
Stefan Hinum, 2018-07-18 (Update: 2018-07-18)