Samsung Galaxy A51 vs Xiaomi Redmi Note 9

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$319 VIEW ON AMAZON
$167 VIEW ON AMAZON

Display

Size

6.5 inches
6.5 inches

Resolution

2400 x 1080 pixels, 20:9 ratio,
405 PPI
2340 x 1080 pixels, 19.5:9 ratio,
395 PPI

Technology

Super AMOLED
IPS LCD

Screen-to-body

87.37 %
83.52 %

Features

Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor
Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor

Hardware

System chip

Samsung Exynos 9611
MediaTek Helio G85

Processor

Octa-core, 2300 MHz, ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm
Octa-core, 2000 MHz, Arm Cortex-A75 and ArmCortex-A55, 64-bit, 12 nm

GPU

Mali-G72 MP3
Mali G52 MC2

RAM

4GB LPDDR4
3GB LPDDR4

Internal storage

128GB, available to use: 105.9 GB
64GB (eMMC 5.1)

Storage expansion

microSDXC up to 512 GB
microSDXC up to 128 GB

OS

Android (10), Samsung One UI
Android (10), Xiaomi MI UI

Battery

Capacity

4000 mAh
5020 mAh

Type

Li - Polymer, Not user replaceable
Li - Polymer, Not user replaceable

Battery life test results

Charging

Fast charging
Fast charging, Reverse charging

Max charge speed

 
Wired: 18.0W

Camera

Rear

Quad camera
Quad camera

Main camera

48 MP (PDAF)
48 MP (PDAF)

Specifications

Aperture size: F2.0; Focal length: 26 mm; Sensor size: 1/2"; Pixel size: 0.8 μm
Aperture size: F1.8; Sensor size: 1/2"; Pixel size: 0.8 μm

Second camera

12 MP (Ultra-wide)
8 MP (Ultra-wide)

Specifications

Aperture size: F2.2; Focal Length: 13 mm; Pixel size: 1.12 μm
Aperture size: F2.2; Sensor size: 1/4"; Pixel size: 1.2 μm

Third camera

5 MP (Macro)
2 MP (Macro, Autofocus)

Specifications

Aperture size: F2.4; Focal Length: 40 mm
Aperture size: F2.4; Pixel size: 1.75 μm

Fourth camera

5 MP (Depth information)
2 MP

Specifications

Aperture size: F2.2; Sensor size: 1/5"; Pixel size: 1.12 μm
Aperture size: F2.4; Sensor size: 1/5"; Pixel size: 1.7 μm

Video recording

3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps)
1920x1080 (Full HD) (30 fps), 1280x720 (HD) (120 fps)

Features

Hyperlapse, EIS
 

Front

32 MP (HDR)
13 MP (HDR)

Design

Dimensions

6.24 x 2.90 x 0.31 inches (158.5 x 73.6 x 7.9 mm)
6.39 x 3.04 x 0.35 inches (162.3 x 77.2 x 8.9 mm)

Weight

6.07 oz (172.0 g)
the average is 6.2 oz (176 g)
7.02 oz (199.0 g)
the average is 6.2 oz (176 g)

Materials

Back: Plastic; Frame: Plastic
Frame: Plastic

Resistance

 
Splash

Biometrics

2D Face unlock, In-screen fingerprint
Fingerprint (touch)

Colors

Prism Crush black, Prism Crush white, Prism Crush pink, Prism Crush blue
Forest green, Polar white, Midnight gray

Cellular

LTE (FDD)

Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 14(700 PS), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 20(800 DD), 28(700 APT)

LTE (TDD)

Bands 38(2600), 39(1900+), 41(2600+)
Bands 38(2600), 40(2300), 41(2600+)

UMTS

850, 900, 1700/2100, 1900, 2100 MHz
850, 900, 1700/2100, 1900, 2100 MHz

Data Speed

LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM

 
Yes

SIM type

Nano SIM
Nano SIM

VoLTE

 
Yes

Multimedia

Headphones

3.5mm jack
3.5mm jack

Speakers

Earpiece, Loudspeaker
Earpiece, Loudspeaker

Features

Dolby Atmos
 

Screen mirroring

Wireless screen share
Wireless screen share

Radio

FM
 

Additional microphone(s)

for Noise cancellation
for Noise cancellation

Connectivity & Features

Bluetooth

5.0
5.0

Wi-Fi

802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot

USB

Type-C (reversible), USB 2.0
Type-C (reversible), USB 2.0

Features

Charging, OTG
Charging

Location

GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning

Sensors

Accelerometer, Gyroscope, Compass, Hall (for flip covers)
Accelerometer, Gyroscope, Compass

Other

NFC, ANT+
NFC, Infrared

Regulatory Approval

FCC approval

 
 

Date approved

Nov 28, 2019
 

FCC ID value: A3LSMA515FN link
 

Measured SAR

 
 

Head

0.89 W/kg
 

Body

1.18 W/kg
 

Simultaneous Transmission

1.56 W/kg
 

Wireless Router

1.12 W/kg
 

Phablet

2.76 W/kg
 

Buyers information

In The Box

 
22.5W Charger, Simple protective cover, USB Type-C cable, SIM eject tool, User guide, Warranty card

Price

$ 400
 
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