The ASUS ZenFone 2 Review
by Brandon Chester on May 26, 2015 8:00 AM ESTNAND Performance
While it's not disclosed by manufacturers, the speed of NAND on a smartphone is a very important aspect of overall smartphone performance. It has an impact on how long cameras can do burst capture, and how well the phone performs when apps are running both in the foreground and the background. To evaluate the NAND performance of the ZenFone 2 I've run it through both of our internal storage benchmarks. Because our iOS benchmark only supports a single IO thread, we'll be using our older storage benchmark alongside the newer Androbench 4.0 test for the foreseeable future.
In our original single threaded storage benchmark the ZenFone 2 is decidedly average in its performance. In every case it's either slightly above or below the median result on our charts. It's important to keep in mind that this test puts devices like the Galaxy S6 with its UFS storage at a disadvantage, as its NAND can make use of several IO threads due to the use of a command queue.
In our newer AndroBench 4.0 storage test we see that the ZenFone 2 ends up falling farther behind the other devices that we've run through the test. In the sequential read test it's not the slowest device, but that's only due to the Nexus 6 being extremely far behind every other device as a result of Google's full disk encryption. In the sequential write and random read tests it's comes behind the HTC One (M9), although to a very small degree in the latter test. Random writes are where it really stumbles, with a speed that's less than half of the next slowest device.
I'm not sure whether I can attribute it to the enormous amount of RAM that the 4GB version of the ZenFone 2 can use as a cache, but I never noticed any issues with performance as a result of IO operations being run either by the app I was using or by another application in the background. Even when updating applications, performance remained consistent.
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Brandon Chester - Saturday, June 6, 2015 - link
I never had a second SIM in the phone.Ethos Evoss - Friday, June 12, 2015 - link
LG g3 copy ?arnab_mallik - Monday, June 15, 2015 - link
Can u actually get 390 nits of brightness in this device?Rahul Ram - Tuesday, June 16, 2015 - link
Sir my mom offered me 25,000 rupeesi wish buy asus zenfone 2
shall i buy it or not
ofers - Thursday, June 18, 2015 - link
הוראות הפעלה בעברית שלטלפון חדשginto - Wednesday, June 24, 2015 - link
Hi, I just have a brand new ASUS ZENFONE 2 ZE551ML 4/64GB after months of waiting. First day I charge it overnight and day after when it was at 39% it automatically shut down I try a 2nd overnight charge, after 6 hours working and setting pretty good it will automatically shut down when the battery was about 43% and has to be connected to the charger if i want to start up. ! 3rd overnight charge and yesterday evening at around 45% shut down AGAIN. I not charge it anymore. Go back to shop for money back !!OFelix - Saturday, June 27, 2015 - link
Is the battery fixed or replaceable? It doesn't say in the table of spec's (it should!).I couldn't find this obvious piece of information on the battery life page.
(I searched for 'fix','remov' or 'replac')
squalldna - Sunday, June 28, 2015 - link
am i the only one getting this problem with my zf2 2gb 16gb 1.8ghz:after complete battery drain, device cant resume when turned on unless charged for 10-20 minutes. unlike my other devices they can be turned on from 0% battery immediately once plugged. i posted this to XDA, people said that it's normal. do you have the same experience?
Belldandy - Friday, August 21, 2015 - link
Can we get an update on the Zenfone 2 after numerous firmware updates? Also if possible test out the 4GB/ 64GB flash and the 3580 processor.eldakka - Tuesday, September 1, 2015 - link
" While battery life on the ZenFone 2 may not always be the best, buyers may find some comfort in knowing that when it does die they'll be able to get it up and running in a very short period of time."Sounds a lot like a teenager.