Home Phone comparison Xiaomi Redmi 9 and Samsung Galaxy A51 - Which is better?

Xiaomi Redmi 9 vs Samsung Galaxy A51

42 out 100
Xiaomi Redmi 9
VS
41 out 100
Samsung Galaxy A51
Xiaomi Redmi 9
Samsung Galaxy A51

Compared 2 smartphones : Xiaomi Redmi 9 Manufactured in July, 2020, with display 6.53 with chipsetMediaTek Helio G80, vs Samsung Galaxy A51, Manufactured in December, 2019 with chipsetSamsung Exynos 9 Octa 9611. Below are specs, tests, pros and cons for each device

  1. Differences
  2. Review
  3. Specs
  4. Benchmarks
  5. Battery Life
  6. Cameras
  7. Comments (0)

Key Differences

Device key advantages
Reasons to choose Xiaomi Redmi 9
  • Larger display: 6.53in
  • Higher battery capacity: 5020mAh vs 4000mAh
  • Infrared port
  • Includes charger
Reasons to choose Samsung Galaxy A51
  • Higher pixel density: 405ppi
  • Lighter design: 172g vs 198g
  • Supports Dolby Atmos

Versions

Available versions and configurations
Memory Options - 3/32 GB
- 4/64 GB
- 4/128 GB
- 6/128 GB		 - 4/64 GB
- 4/128 GB
- 6/128 GB
- 8/128 GB
- 8/256 GB

Review

Key Specs Xiaomi Redmi 9 and Samsung Galaxy A51
Display
Color accuracy, sharpness & brightness
Camera
Main & front camera tests
Performance
App & system performance
Games
3D gaming performance
Battery
Battery life, charging speed & type
Connectivity
Connectivity features
NanoReview Score
Overall score by NanoReview
Adjust each parameter’s importance to find the best match for you.
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Function
Importance (Weight)
Display:
Camera:
Performance:
Gaming:
Battery:
Connectivity:
Higher weight means greater impact on NanoReview score.

Tests & specs

Specs & test comparison
Smartphones:
Xiaomi Redmi 9
vs
Samsung Galaxy A51

Display

Display quality comparison
Type IPS LCD Super AMOLED
Size 6.53 in 6.5 in
Resolution 1080x2340 pixels 1080x2400 pixels
Aspect ratio 19.5:9 20:9
Pixel density 395 ppi 405 ppi
Refresh rate 60 Hz 60 Hz
Adaptive refresh rate No No
Max brightness 400 nits 400 nits
HDR support No No
Screen-to-body ratio 83.2 % 87.5 %
Features n/a Always-On Display
Display test
Peak brightness (auto)
Xiaomi Redmi 9
423 nits
Samsung Galaxy A51
631 nits
sRGB gamut93 %98.8 %
PWM (Flicker)500 Hz242 Hz
Response time35 ms25 ms
Contrast710:1∞ Infinite
Sources: NotebookCheck [Xiaomi Redmi 9], [Samsung Galaxy A51]

Design & Build

Design and ergonomics comparison
Height 163.3 mm (6.43 in) 158.5 mm (6.24 in)
Width 77 mm (3.03 in) 73.6 mm (2.9 in)
Thickness 9.1 mm (0.36 in) 7.9 mm (0.31 in)
Weight 198 g (6.98 oz) 172 g (6.07 oz)
Water resistance No No
Back panel Plastic Plastic
Frame Plastic Plastic
Colors - Gray
- Green
- Purple		 - White
- Black
Fingerprint sensor Yes rear Yes In-Display
Screen-to-body ratio
Xiaomi Redmi 9
83.2 %
Samsung Galaxy A51
87.5 %

Performance

Testing Xiaomi Redmi 9 and Samsung Galaxy A51 In benchmarks
Processor
Chipset MediaTek Helio G80 Samsung Exynos 9 Octa 9611
Max Frequency 2000 MHz 2300 MHz
CPU Cores 8 (2 + 6) 8 (4 + 4)
Architecture - 6/1.8 (Cortex-A55)
- 2/2 (Cortex-A75)		 - 4/1.7 (Cortex-A53)
- 4/2.3 (Cortex-A73)
Process TSMC Samsung
Transistor Size 12 nm 10 nm
Neural Processor Yes Yes
Graphics Mali-G52 MP2 Mali-G72 MP3
GPU Cores 48 54
GPU Frequency 950 MHz 850 MHz
FLOPS 91.2 GFLOPS 113.8 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Xiaomi Redmi 9
514
Samsung Galaxy A51
512
Geekbench 6 (Multi-Core)
Xiaomi Redmi 9
1559
Samsung Galaxy A51
1556
Geekbench 6 (Single-Core)514512
Geekbench 6 (Multi-Core)15591556
AnTuTu 10
AnTuTu 10
Xiaomi Redmi 9
263655
Samsung Galaxy A51
268760
CPU9363483857
GPU3888345166
Memory6298363828
UX6815575909
NanoReview Score263655268760
3DMark Wild Life
3DMark Wild Life
Xiaomi Redmi 9
664
Samsung Galaxy A51
812
Max Surface Temp.47 °C42.2 °C
Stability98 %95 %
Graphics Test3 fps4 fps
Graphics Score664812
Sources: 3DMark [Xiaomi Redmi 9], [Samsung Galaxy A51]
PCMark 3.0
PCMark 3.0
Xiaomi Redmi 9
8330
Samsung Galaxy A51
n/a
Writing score9134n/a
Web score7371n/a
Video editing5562n/a
Data manipulation6064n/a
NanoReview Score8330n/a

Memory

RAM
RAM Size - 3 GB
- 4 GB
- 6 GB		 - 4 GB
- 6 GB
Memory Type LPDDR4X LPDDR4X
Memory Frequency 1866 MHz 1866 MHz
Channels 2 2
Storage
Storage Capacity- 32 GB
- 64 GB
- 128 GB		- 64 GB
- 128 GB
Storage TypeeMMC 5.1UFS 2.0
Memory CardMicroSDMicroSD

Software

OS Android 10 (Upgradeable to Android 12) Android 10 (Upgradeable to Android 13)
OS Size 13 GB 23 GB
UI Skin MIUI 13 One UI 5.1

Battery

Volume 5020 mAh 4000 mAh
Max Charging Power 18 W 15 W
Battery Type Li-Po Li-Po
Removable No No
Wireless Charging No No
Reverse Charging No No
Fast Charging Yes (50% in 80 min) Yes (40% in 35 min)
Full Charge Time 3:05 h 1:50 h
Battery Life Test
Battery Life
Xiaomi Redmi 9
22:51
Samsung Galaxy A51
17:53
Web Browsing08:45 h07:15 h
Video Playback13:56 h11:25 h
Games05:30 h04:49 h
Standby Mode113 h81 h

Main camera

Matrix 13 MP 48 MP
Photo resolution 4128x3096 pixels 8000x6000 pixels
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K Recording No No
4K Recording No Yes (Up to 30 fps)
1080p Recording Yes (Up to 30 fps) Yes (Up to 30 fps)
Slow Motion 120 fps (720p) 960 fps (720p)
Wide-angle lens 118 ° 120 °
Lenses count Standard: 13 MP
Ultra-wide: 8 MP
Macro: 5 MP
Depth: 2 MP		 Standard: 48 MP
Ultra-wide: 12 MP
Macro: 5 MP
Depth: 5 MP
Features - Bokeh effect
- Pro mode		 - Bokeh effect
- Pro mode
Main lens
Matrix13 MP48 MP
Aperturef/2.2f/2.0
Focal length28 mm26 mm
SensorOmnivision OV13B10Sony IMX582
Sensor size1/3.11/2
Pixel size1.12 μm0.8 μm
AutofocusPhase autofocusPhase autofocus
StabilizationDigitalDigital
Ultra-wide lens
Matrix8 MP12 MP
Aperturef/2.2f/2.2
Focal length13 mm13 mm
SensorOmniVision OV8856n/a
Sensor size1/4.0n/a
Pixel size1.12 μm1.12 μm
StabilizationDigitalDigital

Front camera

Matrix 8 MP 32 MP
Photo resolution 3264x2448 pixels 6560x4928 pixels
Aperture f/2.0 f/2.2
Focal length 27 mm 26 mm
Sensor CMOS Samsung S5KGD1
Sensor size 1/4.0 1/2.8
Pixel size n/a 0.8 μm
Autofocus No No
Stabilization Digital Digital
Video resolution 1080p (Full HD) at 30 fps 2160p (4K) at 30 fps
TOF 3D sensor No No

Connectivity

Wi-Fi version Wi-Fi 5 (802.11 a/b/g/n/ac) Wi-Fi 5 (802.11 a/b/g/n/ac)
Wi-Fi features - Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display		 - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5 5
Bluetooth features LE, HID, A2DP PBAP/PAB, PAN, OPP, MAP, HSP, HID, HFP, DIP, AVRCP, A2DP
USB type USB Type-C USB Type-C
USB version 2 2
USB features - Charging
- USB Storage Mode
- OTG		 - Charging
- USB Storage Mode
- OTG
GPS - GPS
- GLONASS
- Beidou
- Galileo		 - GPS
- GLONASS
- Beidou
- Galileo
NFC* Yes Yes
Infrared Port Yes No
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *NoNo
Hybrid SlotNoNo
2G BandsGSM B2/3/5/8GSM 850 / 900 / 1800 / 2100 / 2600
3G BandsHSDPA B1/2/4/5/8UMTS 850 / 900 / 1900 / 2100
LTE Bands*LTE (B1/B2/B3/B4/B5/B7/B8/B20/B28)LTE (B850/B900/B1800/B2100/B2600)
LTE category712
5G SupportNoNo

Sound

Speakers Mono Mono
3.5 mm Jack Yes Yes
FM Radio Yes Yes
Dolby Atmos No Yes
Speaker Test
Max Volume
Xiaomi Redmi 9
83.7 dB
Samsung Galaxy A51
81.7 dB

Other

Class Budget Mid-range
Announced June, 2020 yr December, 2019 yr
Release Date July, 2020 yr December, 2019 yr
Launch Price ($) 130 399
Sensors - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included Yes 10 W n/a
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

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