Xiaomi Redmi 4X vs Samsung Galaxy S9

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Display

Display size

5.0 inches
5.8 inches

Resolution

720 x 1280 pixels
1440 x 2960 pixels

Pixel density

294 ppi
568 ppi

Technology

IPS LCD
Super AMOLED

Screen-to-body ratio

70.89 %
84.36 %

Features

Scratch-resistant glass (Corning Gorilla Glass), Ambient light sensor, Proximity sensor
HDR video support, Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor

Camera

Rear

Single camera
Single camera

Main camera

13 megapixels
12 megapixels

Hardware Features

Phase detection autofocus
Optical image stabilization, Phase detection autofocus

Specifications

Aperture size: F2.0
Aperture size: F1.5/F2.4; Sensor size: 1/2.55"; Pixel size: 1.4 μm

Video recording

1920x1080 (Full HD) (30 fps)
3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps)

Features

Video calling, Video sharing
High Dynamic Range mode (HDR), Time-lapse video, Hyperlapse, Continuous autofocus, Object tracking, Picture-taking during video recording, Video calling, Video sharing

Front

5 megapixels
8 megapixels

Features

 
Autofocus, High Dynamic Range mode (HDR)

Design

Dimensions

5.48 x 2.75 x 0.34 inches (139.24 x 69.96 x 8.65 mm)
5.81 x 2.70 x 0.33 inches (147.7 x 68.7 x 8.5 mm)

Weight

5.15 oz (146 g)
the average is 6.1 oz (174 g)
5.75 oz (163 g)
the average is 6.1 oz (174 g)

Materials

Back: Aluminum
Back: Glass (Corning Gorilla Glass 5); Frame: Aluminum

Resistance

 
Water, Dust; IP 68

Biometrics

Fingerprint (touch)
Iris scanner, 2D Face unlock, Fingerprint (touch)

Features

Touch sensitive control keys
Notification light

Colors

Black, Gold
Black, Gold, Gray, Purple, Blue, Red

Multimedia

Headphones

3.5 mm jack
3.5 mm jack

Speakers

Earpiece, Loudspeaker
Earpiece, Multiple speakers

Features

Album art cover, Background playback
32-Bit DAC, aptX-HD

Screen mirroring

Wireless screen share
Wireless screen share

Radio

 
FM

Additional microphone(s)

 
for Noise cancellation

Hardware & Performance

System chip

Qualcomm Snapdragon 435 8940
Qualcomm Snapdragon 845 SDM845

Processor

Octa-core, 1400 MHz, ARM Cortex-A53, 64-bit, 28 nm
Octa-core, 2800 MHz, Kryo 385, 64-bit, 10 nm

GPU

Adreno 505
Adreno 630

RAM

3 GB
4 GB

Internal storage

32 GB
64 GB

Storage expansion

microSDXC up to 128 GB
microSDXC up to 400 GB

OS

Android (6.0 Marshmallow)
Android (9.0 Pie, 8.0 Oreo), Samsung One UI

Connectivity & Features

Bluetooth

4.2
5.0

Wi-Fi

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

USB

microUSB, USB 2.0
USB Type-C (reversible), USB 3.1

Features

Mass storage device, USB charging
USB OTG, Video out

Location

GPS, A-GPS, Glonass, BeiDou
GPS, A-GPS, Glonass, Galileo, BeiDou

Sensors

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

Mobile Payment

 
Samsung Pay

Other

Infrared, VoIP, Tethering, Computer sync, OTA sync
NFC, ANT+

Cellular

LTE (FDD)

 
Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 29, 30, 66, 71

LTE (TDD)

 
Bands 38, 39, 40, 41, 46

UMTS

 
850, 900, 1700/2100, 1900, 2100 MHz

Data

LTE-A Cat 7 (300/100 Mbit/s), HSPA
LTE-A Pro Cat 18 (1200/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA

Dual SIM

Yes
 

SIM type

Nano SIM, Micro SIM
Nano SIM

Battery

Capacity

4100 mAh
3000 mAh

Type

Not user replaceable
Li - Ion, Not user replaceable

Charging

 
Qualcomm Quick Charge 2.0, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging

Talk time

36.00 hours
the average is 20 h (1174 min)
31.00 hours
the average is 20 h (1174 min)

Stand-by time

 
3.4 days (82 hours)
the average is 20 days (491 h)

Stand-by time (4G)

18.0 days (432 hours)
the average is 24 days (583 h)
 

Internet use

 
3G: 11 hours; LTE: 12 hours; Wi-Fi: 14 hours

Music playback

87.00 hours
51.00 hours

Video playback

15.00 hours
17.00 hours

Phone features

Notifications

Haptic feedback
 

Other features

Voice dialing, Voice commands, Voice recording
 

Regulatory Approval

FCC approval

 
 

Date approved

 
Jan 11, 2018

 
FCC ID value: A3LSMG960U link

Measured SAR

 
 

Head

 
0.35 W/kg

Body

 
0.96 W/kg

Simultaneous Transmission

 
1.59 W/kg

Wireless Router

 
0.95 W/kg

Shopping information

In The Box

power adapter, USB cable, warranty card, user guide, SIM insertion tool
 

MSRP price

 
$ 720
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