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The Asus ZenBook S Ultra Thin Laptop is on Sale at $150 Off!

(Image credit: Asus)

We’ve just spotted this Asus ZenBook S (UX391UA-XB81-R) 13.3-inch laptop deal online and it was too good of an opportunity to pass up. Coming in at $788, you’ll save on average $150 off its regular price, and $411 off its launch price. That’s a fairly comfortable 16% off at a minimum, and it’s not even Black Friday yet.  


The Asus ZenBook S UX391UA-XB81-R 13.3" Laptop

The Asus ZenBook S UX391UA-XB81-R 13.3" Laptop is on sale now for $788.77 at, that's $150 off its regular price (16%)


Let’s be clear though this is an older model. It first debuted back late in 2018, and it’s certainly not aimed at the power user market. However, the Asus ZenBook S isn’t exactly a slouch either. It comes packing a quad core, eight thread Intel Core i7-8550U, capable of boosting all the way up to 4.0 GHz, a 256 GB M.2 SATA 3 SSD, 8 GB of LPDDR3 RAM, a fairly substantial 9 hour battery life, and a 1080p 300-nit brightness 13.3-inch slim bezel display.  

Use Case

It really is ideal for casual use, and light business use. Not exactly a laptop designed for extensive gaming sessions, or opening up 1,000 tabs in Google Chrome, but still more than capable for 95% of daily use. If you consider just how much hardware has been packed into this thing’s super small design though, well it’s hard not to be impressed. Of course you don’t have access to a dedicated GPU unit, instead you’ll be using Intel’s Integrated UHD Graphics 620, however for Youtube, streaming and desktop use that’s more than adequate.

The reality is it’s the ZenBook S’s design that will draw your eye to it. That intense brushed aluminum, burgundy red finish lining the entire thing certainly does make it pop quite dramatically. Draw your eyes to the screen and you’ll notice a serious lack of bezel. This is what Asus is calling its NanoEdge FullHD Display. It claims the ZenBook S has an 85% screen to body ratio further entrenching that premium aesthetic. Although we don’t have an exact name as to what type of panel Asus is using here, judging from the specs (100% sRGB color gamut, and a 178° viewing angle) we believe it to be IPS.

As for input and other frills, you get a standard low-profile chiclet backlit keyboard, with 1.2mm of travel, and a glass covered touchpad which features an integrated fingerprint sensor that supports Windows Hello. There’s also a HD webcam, and audio is provided by a set of stereo Harman Kardon approved speakers.


ProcessorIntel Core i7-8550U
GraphicsIntel UHD Graphics 620
RAM8GB LPDDR3 @ 2,133 MT/s
Display Type13.3-inch Display
Storage256GB M.2 SATA 3 SSD
Connectivity3x USB 3.1 Type C (2x Thunderbolt 3), 1x 3.5mm Headphone Jack, 1x Asus USB Type C Dock
Battery50Whr Li-Polymer - 9 Hours
Operating SystemWindows 10 Pro
Dimensions12.2 x 8.4 x 0.5 - inches
Weight2.3 lbs


As for ports, well we never expected much given the thickness of the design, and the compact form factor. And the result? You get access to a headphone jack, three USB 3.1 Type C ports, two of which are Thunderbolt 3 compatible, all three support fast charging, and display connectivity as well, and of course you also have access to Dual-band 802.11 ac Wi-Fi and Bluetooth 4.2 and that’s about it. As added extras, Asus also includes a mini USB Type C dock, with two ports, one HDMI and one for traditional USB Type A as well with the ZenBook S, so at least you’re not paying extra for that. 

(Image credit: Asus)

Bottom Line

This variant of Asus’s ZenBook S UX391UA is ideal for those who are looking for a light-weight sleek laptop for simple business and daily use. It does have its limitations, most notably when it comes to graphical performance and memory/storage, but given what exactly it is the ZenBook S is trying to achieve, we can’t really criticize it too much for it. It’s not flawless, in an ideal world we’d have loved to have seen 16GB of DDR3 at this price point, but again with good program and Google Chrome management, we’re not exactly expecting that to be a problem.

Zak Storey

As Associate Editor of Tom's Hardware's prestigous British division, Zak specializes in system building, case reviews and peripherals, and has a particular penchant for liquid-cooling. He's also a lover of all things Viking/Scandinavian (thus the poor attempt at a beard).

  • Rdslw
    Well its adequate now, but as ryzen & intel introduce A LOT of horsepower into the GPU it will age incredibly fast. Looking at the speed of CPU growth, its fine for next 3-4 years IF you can bump ram.. oh DDR3, are we still in 2015?
  • AndyWiryaPeaceful
    Beware of Asus notebooks!!!

    I had recently bought 5 Vivobook X505 Ryzen 3 2200U 4GB notebooks that comes with windows 10 that I had upgraded each one all by myself to a total of 8GB RAM.

    So 4 was OK and one of them pops out windows activation expiry warning once every 3 seconds, so after resetting that one to factory setting does not solve the problem, I clean installed windows by myself and went to for drivers.

    Turns out none of all drivers for Vivobook X505 in nor works, so I had to take it to service center in Jakarta.

    Service center guy notifies me that everything is ok now and notebook is ready for pick up and asks for Rp150,000 (about US$10) service fee because I was supposed to have them install that 4GB RAM chip. So if I don't pay it, he'd get Asus to void my warranty although nothing is broken.

    So I won't pay for it and now Asus service center in Jakarta has a million excuse why that notebook is not ready for pick up yet.

    Seriously, Asus & AMD, why the hell none of its drivers in nor works to begin with?

    Please fix this.