Xiaomi Mi 9 vs Samsung Galaxy A51 Specs Comparison

Design

Dimensions
6.20 x 2.94 x 0.30 inches 157.5 x 74.67 x 7.61 mm	6.24 x 2.90 x 0.31 inches 158.5 x 73.6 x 7.9 mm
Weight
6.10 oz (173.0 g)	6.07 oz (172.0 g)
Materials
Back: Glass (Corning Gorilla Glass 5) Frame: Metal	Back: Plastic Frame: Plastic
Biometrics
Optical in-screen fingerprint	2D Face unlock, Optical in-screen fingerprint
Keys
	Right: Volume control, Lock/Unlock key
Colors
Black, Purple, Blue	Prism Crush black, Prism Crush white, Prism Crush pink, Prism Crush blue

Display

Size
6.4-inch	6.5-inch
Resolution
2340x1080px, 19.5:9 ratio, 403 PPI	2400x1080px, 20:9 ratio, 405 PPI
Technology
AMOLED	Super AMOLED
Refresh rate
	60Hz
Screen-to-body
85.23 %	87.37 %
Peak brightness
600 cd/m2 (nit)
Features
HDR support, Oleophobic coating, Scratch-resistant glass (Corning Gorilla Glass 6), Ambient light sensor, Proximity sensor	Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 855 (7 nm)	Samsung Exynos 9611 (10 nm)
Processor
Octa-core 2840 MHz Kryo 485	Octa-core 2300 MHz 4x 2.3GHz Cortex-A73 + 4x 1.7GHz Cortex-A53
GPU
Adreno 640	Mali-G72 MP3
Memory
6GB (LPDDR4)/128GB	4GB (LPDDR4)/128GB
Storage expansion
not expandable	microSDXC up to 512 GB
OS
Android (9.0 Pie)	Android (11, 10)

Battery

Type
3300 mAh	4000 mAh, Li - Polymer
Charging
Qualcomm Quick Charge 4+ Qi wireless charging	Fast charging

PhoneArena Battery Tests

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Battery Life Estimate

5h 22min

Browsing

11h 35min

Video

8h 35min

Gaming

6h 40min

Learn more on our PhoneArena Battery Test Results page

Camera

Rear
Triple camera	Quad camera
Main camera
48 MP (Sapphire crystal lens cover, Laser and PDAF, CMOS image sensor) Aperture size: F1.8 Focal length: 26 mm Sensor size: 1/2" Pixel size: 0.8 μm	48 MP (PDAF) Aperture size: F2.0 Focal length: 26 mm Sensor size: 1/2" Pixel size: 0.8 μm
Second camera
12 MP (Telephoto, Sapphire crystal lens cover, PDAF) Optical zoom: 2.0x Aperture size: F2.2 Focal Length: 50 mm Sensor size: 1/3.4" Pixel size: 1 μm	12 MP (Ultra-wide) Aperture size: F2.2 Focal Length: 13 mm Pixel size: 1.12 μm
Third camera
16 MP (Ultra-wide, Sapphire crystal lens cover, PDAF) Aperture size: F2.2 Focal Length: 17 mm Sensor size: 1/3" Pixel size: 1 μm	5 MP (Macro) Aperture size: F2.4 Focal Length: 40 mm
Fourth camera
	5 MP (Depth information) Aperture size: F2.2 Sensor size: 1/5" Pixel size: 1.12 μm
Flash
Dual LED	LED
Video recording
4K UHD (60 fps), 1080p (960 fps), 720p (960 fps) Continuous autofocus, EIS, Video calling, Video sharing	4K UHD (30 fps), 1080p (120 fps), 720p (240 fps) Hyperlapse, EIS
Front
20 MP (HDR) Video capture: 1080p	32 MP (HDR) Video capture: 1080p

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
802.11 a,b,g,n,ac,dual-band MIMO, Wi-Fi Direct, Hotspot	802.11 a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot
USB
Type-C, USB 2.0	Type-C, USB 2.0
Location
GPS, A-GPS, Glonass, Galileo, BeiDou	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass	Accelerometer, Gyroscope, Compass, Hall (for flip covers)
Other
NFC, Infrared, VoIP, Tethering, Computer sync, OTA sync	NFC, ANT+

Multimedia

Headphones
No 3.5mm jack	3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Loudspeaker
Features
aptX-HD	Dolby Atmos
Screen mirroring
Wireless screen share	Wireless screen share
Radio
	FM
Additional microphone(s)
	Noise cancellation

Cellular

4G (FDD)
Bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 28	Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 20, 25, 26, 28, 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)
4G (TDD)
Bands 38, 39, 40	Bands 38, 39, 41
3G
Bands 5, 8, 4, 2, 1	Bands 1, 2, 4, 5, 8
Data Speed
LTE-A, HSPA, HSUPA	LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
Dual SIM
Yes
SIM type
Nano SIM	Nano SIM
HD Voice
Yes
VoLTE
Yes

Phone Features

Notifications
Haptic feedback, Music ringtones, Vibration
Other features
Voice dialing, Voice commands, Voice recording

Regulatory Approval

FCC approval
	Date approved: Nov 28, 2019 FCC ID value: A3LSMA515FN
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

MSRP
	$ 400
In The Box
Case, 18W Charger, USB Type-C cable, Type-c to 3.5 mm adapter, SIM removal tool, Documentation

Availability

Officially announced
Feb 20, 2019	Dec 12, 2019

Alternative variants

with 64 GB storage

Memory	64GB

with 128GB storage

Memory	6GB/128GB

Explorer Edition

Memory	12GB/256GB

for Verizon

4G (FDD)	Bands 2, 3, 4, 5, 7, 13, 20, 28, 66(AWS-3)
3G	Bands 5, 8, 2, 1

for AT&T

4G (FDD)	Bands 2, 4, 5, 12, 13, 25, 26, 66(AWS-3), 71(600)
4G (TDD)	Bands 41

for Sprint

4G (FDD)	Bands 2, 4, 5, 12, 13, 25, 26, 66(AWS-3), 71(600)
4G (TDD)	Bands 41

for Europe

4G (FDD)	Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 26, 28, 66(AWS-3)
4G (TDD)	Bands 38, 40, 41
Dual SIM	Yes

Links

Full specifications
Xiaomi Mi 9 Specs	Samsung Galaxy A51 Specs
PhoneArena Review
Xiaomi Mi 9 Review	Samsung Galaxy A51 Review
User Reviews
	Samsung Galaxy A51 User Reviews