Samsung Galaxy A51 vs Xiaomi Redmi Note 7

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Galaxy A51 compared with Redmi Note 7

	SamsungGalaxy A51	XiaomiRedmi Note 7
Overview
Released
Released	December 2019	January 2019
Display
Screen size
Screen size	6.5″	6.3″
Resolution
Resolution	2400 × 1080 (better)	2340 × 1080
Sharpness
Sharpness	405 pixels per inch	409 pixels per inch (better)
Panel
Panel	OLED	LCD
Display type
Display type	Super AMOLED Infinity-O display; 6.3-inch viewable diagonal accounting for rounded corners	LCD panel identified by PhoneArena; Dot Drop display, 19.5:9 aspect ratio and 1,500:1 typical contrast
Screen protection
Screen protection	–	Corning Gorilla Glass 5
Display features
Display features	–	84% NTSC typical; sunlight, night, reading and standard modes; colour-temperature adjustment
Performance
Chip
Chip	Exynos 9611	Qualcomm Snapdragon 660
Memory
Memory	4 GB	3 GB – 4 GB
Storage
Storage	128 GB	32 GB, 64 GB, 128 GB
CPU
CPU	Octa-core, four cores at 2.3 GHz and four at 1.7 GHz; Exynos 9611 confirmed by Samsung support	Snapdragon 660 AIE octa-core processor at up to 2.2 GHz
GPU
GPU	–	Adreno 512 at up to 850 MHz
Storage type
Storage type	Dedicated microSD slot supports cards up to 512 GB; 107 GB available on the 128 GB model	UK configurations of 3/32 GB, 4/64 GB and 4/128 GB; microSD expansion up to 256 GB
Cameras
Main camera
Main camera	48 MP	48 MP
Ultra wide camera
Ultra wide camera	12 MP	None
Telephoto camera
Telephoto camera	None	None
Optical zoom
Optical zoom	None	None
Front camera
Front camera	32 MP (better)	13 MP
Main camera
Main camera	48 MP, F2.0, autofocus; no optical image stabilisation	48 MP with f/1.8 aperture, PDAF, 4-in-1 binning to 1.6 µm pixels and EIS; additional 5 MP depth camera
Ultra wide camera
Ultra wide camera	12 MP, F2.2	–
Front camera
Front camera	32 MP, F2.2, fixed focus	13 MP; AI portrait and beauty modes, HDR, face recognition and selfie timer
Zoom
Zoom	Digital zoom up to 8×	–
Video recording
Video recording	UHD 4K 3840 × 2160 at 30 fps; HD slow motion at 240 fps	Full HD at 30/60 fps or HD at 30 fps; Full HD and HD slow motion at 120 fps, as published by Xiaomi despite Tech Advisor's contrary slow-motion comment
Front video
Front video	–	Full HD or HD at 30 fps
Camera features
Camera features	5 MP F2.4 macro and 5 MP F2.2 depth cameras; Super Steady ultra-wide video in Full HD; rear flash	Night photography, portrait background blur, single-tone flash, low-light enhancement, standard/auto HDR, burst and panorama; 27 rear and 12 front AI scene categories; 48 MP Pro mode at launch, with Photo mode support promised by OTA
Battery and charging
Battery
Battery	4,000 mAh	4,000 mAh
Video playback (maker's claim)
Video playback (maker's claim)	Up to 20 hours	–
Wired charging
Wired charging	Up to 15 W	–
Wireless charging
Wireless charging	None	None
Battery life detail
Battery life detail	4,000 mAh typical, 3,890 mAh rated; up to 20 hours video playback	4,000 mAh typical and 3,900 mAh minimum
Wired charging
Wired charging	15 W fast charging	Quick Charge 4 protocol; included adaptor is 5 V / 2 A, and Xiaomi specifies a separately purchased Quick Charge 4 charger for optimal efficiency
Design
Type
Type	Standard	Standard
Weight
Weight	172 g (better)	186 g
Thickness
Thickness	7.9 mm (better)	8.1 mm
Height × width
Height × width	158.5 × 73.6 mm	159.21 × 75.21 mm
Materials
Materials	–	Gradient glass back finish
Colours
Colours	Prism Crush Black, White and Blue	–
Biometrics
Biometrics	In-screen fingerprint reader	Rear fingerprint reader; face recognition
Sensors
Sensors	Accelerometer, fingerprint sensor, gyroscope, geomagnetic sensor, Hall sensor, light sensor and virtual proximity sensing	Gyroscope, accelerometer, distance, compass, fingerprint, ambient light, vibration motor and IR blaster
Speakers
Speakers	Mono speaker and 3.5 mm headphone socket	Single bottom speaker and 3.5 mm headphone socket, as described by PhoneArena
Software
Operating system
Operating system	Android	Android
Software at launch
Software at launch	Android 10 with One UI 2 (TechRadar)	Android 9 Pie with MIUI 10, as reported by Tech Advisor
In the box
In the box	–	Phone, power adaptor, USB-C cable, SIM tool, user guide, clear soft case and warranty card
Safety features
Safety features	Samsung Knox	–
Connectivity
Mobile network
Mobile network	4G LTE, 3G WCDMA and 2G GSM	LTE FDD B1/B2/B3/B4/B5/B7/B8/B20 and TDD B38/B40; WCDMA B1/B2/B4/B5/B8 and GSM B2/B3/B5/B8
SIM
SIM	Dual nano-SIM with separate microSD slot	Hybrid tray for two SIMs or one SIM plus microSD; either SIM can be selected as primary for 4G+/4G/3G/2G calls and data
Wi-Fi
Wi-Fi	Wi-Fi 5 (802.11a/b/g/n/ac), 2.4 and 5 GHz	Wi-Fi 802.11 a/b/g/n/ac, 2.4/5 GHz and Wi-Fi Direct
Bluetooth
Bluetooth	Bluetooth 5.0	Bluetooth 5.0
NFC
NFC	Supported	No NFC, as reported by Tech Advisor
USB
USB	USB Type-C, USB 2.0	USB-C
Positioning
Positioning	GPS, GLONASS, BeiDou and Galileo	GPS, A-GPS, GLONASS and BeiDou