It's been nearly two years since the release of the Nexus 5 - plenty of time for Google to think up ideas for a direct successor. Thus, we have the Nexus 5X. It's pitched as a smaller, cheaper alternative to the Nexus 6P phablet, but follows on from the Nexus 5 by promising upper-tier performance at a middling price: £349 upwards, in this case.
That's £49 more than the Nexus 5 when it launched, so to see what kinds of upgrades that money will buy, we've checked out both devices' key specs.
Nexus 5X: 147x73x7.9mm, 136g
Nexus 5: 138x69x8.6mm, 130g
The Nexus 5X ditches the Nexus 5's curved top and bottom edges, but has still put on some minor gains - a few millimetres here, a few grams there. The exception is thickness, where the Nexus 5X wins out at a noticeably skinnier 7.9mm.
Part of the added weight will be down to the rear-mounted fingerprint sensor, a new addition to the Nexus 5X. Google has also updated the data and charging connector, switching from the standard microUSB on the Nexus 5 to the altogether speedier USB-C on the Nexus 5X. A slightly taller case and six extra grams is easily a price worth paying for these significant hardware upgrades.
Nexus 5X: 5.2in AMOLED at 1920x1080
Nexus 5: 5in IPS Plus at 1920x1080
It's a close call here. Both screens share an FHD resolution and, while the Nexus 5X's AMOLED tech helps ensure some brilliantly vibrant colours, the Nexus 5 had no problems in this department to begin with.
The Nexus 5X's larger display does mean it has a lower pixel density - 423ppi to the Nexus 5's 445ppi. Nonetheless, we're not convinced that anyone will perceive the difference in practice, and we'd sooner take the extra room over very slightly tighter-packed pixels.
Nexus 5X: Android 6.0 Lollipop
Nexus 5: Android 6.0 Lollipop
The Nexus 5 has certainly come far. From launching with Android 4.4 KitKat, it's been a prompt recipient of every new version since, being one of the first Nexus devices to receive the update to Android 6.0 Lollipop. The Nexus 5X, meanwhile, will ship with it pre-installed.
Both devices, then, can take advantage of Marshmallow's many improvements and new features, from Android on Tap, which allows new kinds of voice controls in third-party apps, to the more user-friendly and privacy-oriented apps permissions system and handy app drawer search tools.
With that in mind, the Nexus 5X does take slightly better advantage of Marshmallow as the new OS adds native support for fingerprint sensors and USB-C, both of which are present on this handset but not on the older Nexus 5.
Nexus 5X: Qualcomm Snapdragon 808 hexa-core (two 1.8GHz cores, four 1.4GHz cores), 2GB of RAM
Nexus 5: Qualcomm Snapdragon 800 2.3GHz quad-core, 2GB RAM
Faster individual cores can speed up single-threaded tasks, but that's all we can think of in the Nexus 5's favour. The Nexus 5X's hexa-core chip should, in all likelihood, easily outpace the Snapdragon 800 in overall performance.
We haven't benchmarked the Nexus 5X yet, but there's a convincing precedent. The Nexus 5 scored 19,379 in the Antutu benchmark when we tested it in 2013, while the LG G4, which includes the same Snapdragon 808, scored a whopping 49,208. Granted, that was with one more gigabyte of RAM than in the Nexus 5X, but we don't expect that to make a huge difference.
Nexus 5X: 12.3MP rear with 4K video, 5MP front
Nexus 5: 8MP rear, 1.3MP front
Both cameras receive major upgrades on the Nexus 5X. The rear unit is bumped up by over 4MP, and has been given full 4K video recording capability, making it one of the cheapest 4K smartphones on the market. The 5MP front-facing camera, while nowhere near as sharp as the main snapper, has also been greatly improved from the Nexus 5's ultra-modest 1.3MP sensor.
There's not much else to say here, other than it's encouraging to see Google fitting its more affordable smartphones with the same kind of gear as its premium ones. Specifically, the Nexus 5X's 12.3MP, 4K-enabled camera is one and the same as the Nexus 6P's rear camera.
Nexus 5X: 2,700mAh
Nexus 5: 2,300mAh
It's not a huge difference, but the Nexus 5X has won this round once again with a higher-capacity battery. Indeed, this was to be expected considering its slightly larger screen and hardware additions such as the fingerprint sensor.
The Nexus 5X will also charge three to five times faster, according to Google, thanks to the USB-C connector and Android 6.0 Marshmallow's Fast Charging mode.
Nexus 5X: 16GB, 32GB
Nexus 5: 16GB, 32GB
One area which Google didn't see fit to develop is storage. The Nexus 5X and Nexus 5 come in 32GB or 16GB varieties, with no microSD support on either.
This is somewhat disappointing, as even though these options aren't quite pushing the very bottom end of the smartphone storage spectrum, the 16GB drive in particular is at odds with the Nexus 5X's other, more upper mid-range hardware. Besides, £349 isn't that cheap; it's easily beyond the point where we could reasonably expect some expandability.
Despite the lack of improved storage, the Nexus 5X is still packed with enough upgrades to justify that raised entry price. Whether it's a good deal compared with other contemporary smartphones, including the Nexus 6P, is another question, but there's no denying - when looking at the updated cameras, faster processor and sleeker, more feature-rich design - that the Nexus 5X is a worthy replacement for the retiring Nexus 5.
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