Asus Zenbook UX305CA Review – Faster but less frugal with Core m3





With the upgrade to Skylake the Zenbook UX305 become faster than its predecessor, but the battery life with light usage has decreased and amounted to eight hours during browsing. That is not wrong, but his predecessor took more than nine hours. The rugged, lightweight body, the matte Full HD screen with high contrast and the accompanying sleeve have remained, some of the UX305 still makes an ultrabook-like laptop for a relatively low price.

Sturdy, lightweight body
Matte screen with high contrast
Sleeve and ethernetverloopje included


No keyboard lighting
Battery life shorter than predecessor

Final Verdict
Tweakers zegt: 8,5
Price at time of publication: € 800, –
Available from: € 798.60
Tested version: Asus Zenbook UX305CA-FC004T

Yes, this is another review of a Zenbook UX305. We have the UX305 been reviewed twice before. The first time was in February 2015, when the first version with Core M 5Y10 was just available, and the second time was in August, when the Asus laptop with a Core i7-5500U processor provided.

The latest Zenbook UX305, which is recognizable by the CA suffix, is equipped with a processor from Intel Skyake-generation Core m3-6Y30. Because it is the first laptop with Core m3 is that we could get, we review the UX305 again, where we focus on the new processor architecture, and their performance and battery life. If you want to read a review that further meets the rest of the laptop, than is the UX305FA still relevant, because apart from the Skylake processor and a new color, the UX305 is unchanged.

Asus Zenbook UX305CA
Zenbook UX305CA

At the time of writing, there are seven to obtain embodiments of the UX305CA. The resolution of the 13.3 “screen is 1920×1080 or 3200×1800 pixels, the memory is 4 or 8GB in size and SSD has a capacity of 128 or 256GB One thing the seven versions have in common. They all feature a Core m3- 6Y30 processor. We tested the simplest version, with a full-HD screen, 4GB memory and a 128GB SSD.
Core m3

Asus Zenbook UX305CA The Core m3 together with the Core m5 and m7’s successor in September 2014 introduced Core M processor. The first generation Core M was eventually get into difference seven flavors, Core M5Y10 to 5Y71. With the new designations of the new Core M is more distinction between the different versions. Or different versions in practice will make much difference remains to be seen, because the first generation Core M was mainly the manufacturer’s power management is important for the performance of the chips. Some laptops could therefore long time use more power, enabling the processor could utilize its maximum turbo speed longer. That meant a Core M 5Y10 in some cases was faster than for example a Core M 5Y70.

How that sits with the UX305, we do not know. It is the first laptop we’ve tested with the Skylake version of Core M, so we can not compare it with other systems with Core m3.

Skylake packages

The Core m3 6y30 is a dual-core processor has hyperthreading and 4MB cache. The clock speed is 900MHz, but Intel’s Turbo Boost ensures that the clock speed to be increased to 2.2GHz. How long these higher clock frequency is used depends among other things on the TDP. That’s all M-Core processors of the Skylake generation by up to enable the manufacturer of 4.5 to 7 watts. For devices that have difficulty disposing of heat in the TDP 6y30 can be lowered to 3.8 Watt, while the M5 and M7 processors can be configured at 3.5 watts. So there is plenty of scope for the Skylake processors too quick or economical to run and using our regular benchmarks we examined how the m3 Core processor performs in the UX305CA.

Enough theory and specs, time benchmarks. We have our regular list turned benchmarks, of which we have some results in the two tables are included below. We naturally compare the old and the new UX305, but also two convertibles that have a Core 5Y10 M processor, but performance varied.

Cinebench R15 – Multi
System Name Processor In points, higher is better
Asus UX305LA-FC017H Core i7-5500U
Dell XPS 13 (fhd, 2015) Core i5-5200U
Asus T300 Chi Core M 5Y10c
Lenovo ThinkPad E550 Core i3-5005U
Asus UX305CA Core m3-6Y30
Toshiba Z20t-B-108 Core M 5Y51
Asus Zenbook UX305 Core M 5Y10
Acer Aspire Switch 12 Core M 5Y10a

It is clear that the upgrade to Core m3 improves the speed of the UX305. In all benchmarks Skylake the new processor is faster, especially when it comes to graphical applications such as Cinebench OpenGL and 3DMark. Interestingly, the Asus T300 Chi with Broadwell processor in all CPU benchmarks is still faster than the Core m3. Apparently, the processor in the Asus T300 Chi so pretty much given temperature and TDP-space, making the T300 Chi is nearly twice as fast as the Acer Switch 12, which has the same processor. Whether such variations in performance, we also see again at the core M3, M5 and M7 processors of Skylake generation, is a matter of waiting until we have tested systems.

3DMark Cloud Gate
System Name Processor GPU In points, higher is better
Dell XPS 13 (fhd, 2015) Core i5-5200U HD 5500
Asus UX305LA-FC017H Core i7-5500U HD 5500
Asus UX305CA Core m3-6Y30 HD 515
Asus T300 Chi Core M 5Y10c HD 5300
Lenovo ThinkPad E550 Core i3-5005U HD 5500
Toshiba Z20t-B-108 Core M 5Y51 HD 5300
Asus Zenbook UX305 Core M 5Y10 HD 5300
Acer Aspire Switch 12 Core M 5Y10a HD 5300

Battery life

When Intel introduced the first generation M-Core processor, the manufacturer promised the performance of an i5 processor with a TDP of 4.5 watts. Those performances were not always met, but especially low consumption led to most laptops and tablets have a long battery life. Battery life we ​​test in three scenarios: during continuous browsing, video watching and when when running PCMark.

Battery test browsing 2013 (180cd / m²)
System Name Processor Screen Battery In minutes, higher is better
Toshiba Z20t-B-108 Core M 5Y51 12.5 ” 72Wh
Asus UX305LA-FC017H Core i7-5500U 13.3 ” 56Wh
Dell XPS 13 (fhd, 2015) Core i5-5200U 13.3 ” 53Wh
Asus UX305FA Core M 5Y10 13.3 ” 45Wh
Lenovo ThinkPad E550 Core i3-5005U 15.6 ” 48Wh
Asus UX305CA Core m3-6Y30 13.3 ” 45Wh
Asus T300 Chi Core M 5Y10c 13.3 ” 31Wh
Acer Aspire Switch 12 Core M 5Y10a 12.5 ” 36Wh

Compared to its predecessor, the UX305 with Skylake must have its speed, but not of its battery life. While browsing, we recorded a battery life that is shorter than an hour at the UX305FA. The gap is narrowing at a heavier load by a 1080p video and only when we turn on the PCMark Creative battery test get a longer battery life than to Broadwell. Similar results we achieved in reviewing the HP Spectre x360 where Skylake proved only more economical than Broadwell under load are. The cause may lie in the absence of the fivr, who was present with Broadwell, but is omitted in Skylake.

The new Zenbook UX305 has been given a new color and a new processor. The Core m3 results in a significant performance boost over its predecessor, but the quantity is difficult to express. If we take the results side by side set, earnings per benchmark shows quite clear to differ. In Photoshop, we have a few seconds faster, while the difference in Lightroom it is twenty percent. In benchmarks that rely primarily on the GPU, the differences are greater, leading to a seventy percent higher 3DMark graphics-score.

Asus Zenbook UX305CA
Asus Zenbook UX305CA
Asus Zenbook UX305CA

Skylake therefore delivers more speed, but the architecture also affects the battery life and then unfortunately in a negative sense. Especially at a low processor load, such as when web browsing, the difference with the UX305FA considerably. The result is still not without merit battery life of eight hours, but a light and compact laptop, such as the UX305 will often be taken and then a long battery life during light work enjoyable.

To the rest of the UX305, we paid little attention in this review, because we have already done that extensively in a previous review and because it has not changed. The metal casing is sturdy and the color after unchanged, as is the matte Full HD screen with high contrast and complete equipment with an enclosed sleeve and included ethernetverloopje. Backlighting for keys missing and unfortunately the price is undoubtedly the weak euro, five decades gone up. For eight hundred euros, the new UX305 but still a very good Core M laptop, with the appearance of an ultrabook.

Lowest Prices for: Asus Zenbook UX305CA-FC004T
Store Rating Price Total

Score: 3

€ 798.60

€ 798.60


Score: 4.5

€ 799, –

€ 799, –


Score: 4.5

€ 799, –

€ 799, –


Score: 4.5

€ 799, –

€ 799, –

Multimedia Center

Score: 4.5

€ 799, –

€ 799, –


In: A Technology & Gadgets Asked By: [21443 Red Star Level]

Answer this Question

You must be Logged In to post an Answer.

Not a member yet? Sign Up Now »

Star Points Scale

Earn points for Asking and Answering Questions!

Grey Sta Levelr [1 - 25 Grey Star Level]
Green Star Level [26 - 50 Green Star Level]
Blue Star Level [51 - 500 Blue Star Level]
Orange Star Level [501 - 5000 Orange Star Level]
Red Star Level [5001 - 25000 Red Star Level]
Black Star Level [25001+ Black Star Level]