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Asus Zenfone 2 ZE551ML

Asus Zenfone 3 ZE552KL

Network
Technology	GSM / HSPA / LTE	GSM / HSPA / LTE
2G bands	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G Network	HSDPA 850 / 900 / 1900 / 2100	HSDPA 850 / 900 / 1900 / 2100 - Global
	TD-SCDMA - China & India	HSDPA 850 / 900 / 1900 / 2100 / 800 - Taiwan
		HSDPA 850 / 900 / 2100 - India
		HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - USA/Brazil
4G Network	1, 2, 3, 4, 5, 8, 9, 18, 19, 28 - Taiwan	1, 2, 3, 5, 7, 8, 20 - Global
	1, 2, 3, 4, 5, 7, 8, 20 - Global	1, 2, 3, 5, 7, 8, 18, 19, 26, 28, 38, 39, 40, 41 - Taiwan
	1, 2, 3, 4, 5, 7, 8, 17, 20 - US	1, 3, 5, 8, 40 - India
	1, 3, 38, 39, 40, 41 - China & India	1, 2, 3, 4, 5, 7, 8, 17, 28 - USA/Brazil
Speed	HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps	HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps (Global), LTE (2CA) Cat6 300/50 Mbps (Taiwan)

Launch
Announced	2015, January. Released 2015, March	2016, May. Released 2016, August
Status	Discontinued	Discontinued

Body
Dimensions	152.5 x 77.2 x 10.9 mm (6.00 x 3.04 x 0.43 in)	152.6 x 77.4 x 7.7 mm (6.01 x 3.05 x 0.30 in)
Weight	170 g (6.00 oz)	155 g (5.47 oz)
Build	Glass front (Gorilla Glass 3), plastic back, plastic frame	Glass front (Gorilla Glass 3), glass back (Gorilla Glass 3), aluminum frame
SIM	Dual SIM (Micro-SIM, dual stand-by)	Hybrid Dual SIM (Nano-SIM/ Micro-SIM, dual stand-by)

Display
Type	IPS LCD	Super IPS+
Size	5.5 inches, 83.4 cm2 (~70.8% screen-to-body ratio)	5.5 inches, 83.4 cm2 (~70.6% screen-to-body ratio)
Resolution	1080 x 1920 pixels, 16:9 ratio (~401 ppi density)	1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
Protection	Corning Gorilla Glass 3	Corning Gorilla Glass 3

Platform
OS	Android 5.0 (Lollipop), upgradable to 6.0 (Marshmallow)	Android 6.0.1 (Marshmallow), upgradable to 7.0 (Nougat), ZenUI 3
Chipset	Intel Atom Z3580 (4 GB RAM model) Intel Atom Z3560 (2 GB RAM model)	Qualcomm MSM8953 Snapdragon 625 (14 nm)
CPU	Quad-core 2.3 GHz (4 GB RAM model) Quad-core 1.8 GHz (2 GB RAM model)	Octa-core 2.0 GHz Cortex-A53
GPU	PowerVR G6430	Adreno 506

Memory
Card slot	microSDXC (dedicated slot)	microSDXC (uses shared SIM slot)
Internal	16GB 2GB RAM, 32GB 2GB RAM, 32GB 4GB RAM, 64GB 4GB RAM, 128GB 4GB RAM	32GB 3GB RAM, 64GB 4GB RAM
		eMMC 5.1

Main Camera
Modules	13 MP, f/2.0, AF	16 MP, f/2.0, PDAF, Laser AF, 3-axis OIS
Features	Dual-LED dual-tone flash, panorama, HDR	Dual-LED dual-tone flash, panorama, HDR
Video	1080p@30fps	4K@30fps

Selfie Camera
Modules	5 MP, f/2.0	8 MP, f/2.0
Video		1080p@30fps

Sound
Loudspeaker	Yes	Yes
3.5mm jack	Yes	Yes
		24-bit/192kHz audio

Comms
WLAN	Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot	Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct
Bluetooth	4.0, A2DP, EDR	4.2, A2DP, EDR, LE
Positioning	GPS, GLONASS	GPS, GLONASS
NFC	Yes	No
Infrared port	No	No
Radio	FM radio, RDS	FM radio
USB	microUSB 2.0, OTG	USB Type-C 2.0, OTG

Features
Sensors	Accelerometer, gyro, proximity, compass	Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass

Battery
Type	Li-Po 3000 mAh, non-removable	Li-Ion 3000 mAh, non-removable
Charging	18W wired, 60% in 40 min (advertised)

Misc
Colors	Osmium Black, Sheer Gold, Glacier Gray, Glamor Red, Ceramic White	Sapphire Black, Moonlight White, Shimmer Gold
SAR EU	0.35 W/kg (head)
Models	Z00AD, Z00A	Z012DB, Z012D, Z012DA, Z012DC, Z012S, Z012DE
Price	About 300 EUR	About 330 EUR

Tests
Performance	Basemark OS II 2.0: 1090 Basemark X: 12565	Basemark OS II 2.0: 1205
Display		Contrast ratio: 1355 (nominal), 2.563 (sunlight)
Camera	Compare PHOTO / Compare VIDEO
Loudspeaker	Voice 62dB / Noise 61dB / Ring 67dB	Voice 65dB / Noise 70dB / Ring 76dB
Audio quality		Noise -86.6dB / Crosstalk -91.1dB
Battery (old)	Endurance rating 59h	Endurance rating 74h