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

Xiaomi Redmi Note 9S vs Samsung Galaxy A51

49 out 100
Xiaomi Redmi Note 9S
VS
41 out 100
Samsung Galaxy A51
Xiaomi Redmi Note 9S
Samsung Galaxy A51

Compared 2 smartphones : Xiaomi Redmi Note 9S Manufactured in April, 2020, with display 6.67 with chipsetQualcomm Snapdragon 720G, 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 Note 9S
  • Larger display: 6.67in
  • Higher battery capacity: 5020mAh vs 4000mAh
  • Infrared port
Reasons to choose Samsung Galaxy A51
  • Higher pixel density: 405ppi
  • Lighter design: 172g vs 210g
  • Supports Dolby Atmos

Versions

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

Review

Key Specs Xiaomi Redmi Note 9S 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
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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 Note 9S
vs
Samsung Galaxy A51

Display

Display quality comparison
Type IPS LCD Super AMOLED
Size 6.67 in 6.5 in
Resolution 1080x2400 pixels 1080x2400 pixels
Aspect ratio 20:9 20:9
Pixel density 395 ppi 405 ppi
Refresh rate 60 Hz 60 Hz
Adaptive refresh rate No No
Max brightness 628 nits 400 nits
HDR support Yes HDR10 No
Screen-to-body ratio 84 % 87.5 %
Features n/a Always-On Display
Display test
Peak brightness (auto)
Xiaomi Redmi Note 9S
571 nits
Samsung Galaxy A51
631 nits
sRGB gamut114.9 %98.8 %
PWM (Flicker)n/a242 Hz
Response time34 ms25 ms
Contrast1111:1∞ Infinite
Sources: NotebookCheck [Xiaomi Redmi Note 9S], [Samsung Galaxy A51]

Design & Build

Design and ergonomics comparison
Height 166 mm (6.54 in) 158.5 mm (6.24 in)
Width 77 mm (3.03 in) 73.6 mm (2.9 in)
Thickness 8.8 mm (0.35 in) 7.9 mm (0.31 in)
Weight 210 g (7.41 oz) 172 g (6.07 oz)
Water resistance No No
Back panel Glass Plastic
Frame Plastic Plastic
Colors - White
- Black
- Blue		 - White
- Black
Fingerprint sensor Yes In-Button Yes In-Display
Screen-to-body ratio
Xiaomi Redmi Note 9S
84 %
Samsung Galaxy A51
87.5 %

Performance

Testing Xiaomi Redmi Note 9S and Samsung Galaxy A51 In benchmarks
Processor
Chipset Qualcomm Snapdragon 720G Samsung Exynos 9 Octa 9611
Max Frequency 2300 MHz 2300 MHz
CPU Cores 8 (2 + 6) 8 (4 + 4)
Architecture - 6/1.8 (Kryo 465 Silver (Cortex-A55))
- 2/2.3 (Kryo 465 Gold (Cortex-A76))		 - 4/1.7 (Cortex-A53)
- 4/2.3 (Cortex-A73)
Process Samsung Samsung
Transistor Size 8 nm 10 nm
Neural Processor Hexagon 692 Yes
Graphics Adreno 618 Mali-G72 MP3
GPU Cores 256 54
GPU Frequency 750 MHz 850 MHz
FLOPS 384 GFLOPS 113.8 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Xiaomi Redmi Note 9S
722
Samsung Galaxy A51
512
Geekbench 6 (Multi-Core)
Xiaomi Redmi Note 9S
1880
Samsung Galaxy A51
1556
Geekbench 6 (Single-Core)722512
Geekbench 6 (Multi-Core)18801556
AnTuTu 10
AnTuTu 10
Xiaomi Redmi Note 9S
387217
Samsung Galaxy A51
268760
CPU13098883857
GPU9009145166
Memory7261563828
UX9352375909
NanoReview Score387217268760
3DMark Wild Life
3DMark Wild Life
Xiaomi Redmi Note 9S
1041
Samsung Galaxy A51
812
Max Surface Temp.42.4 °C42.2 °C
Stability98 %95 %
Graphics Test6 fps4 fps
Graphics Score1041812
Sources: 3DMark [Xiaomi Redmi Note 9S], [Samsung Galaxy A51]
PCMark 3.0
PCMark 3.0
Xiaomi Redmi Note 9S
8091
Samsung Galaxy A51
n/a
Writing score9663n/a
Web score5943n/a
Video editing5437n/a
Data manipulation6802n/a
NanoReview Score8091n/a

Memory

RAM
RAM Size - 4 GB
- 6 GB		 - 4 GB
- 6 GB
Memory Type LPDDR4X LPDDR4X
Memory Frequency 2133 MHz 1866 MHz
Channels 2 2
Storage
Storage Capacity- 64 GB
- 128 GB		- 64 GB
- 128 GB
Storage TypeUFS 2.1UFS 2.0
Memory CardMicroSDMicroSD

Software

OS Android 10.0 (Upgradeable to Android 12) Android 10 (Upgradeable to Android 13)
OS Size 18 GB 23 GB
UI Skin MIUI 14 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 50 min) Yes (40% in 35 min)
Full Charge Time 2:30 h 1:50 h
Battery Life Test
Battery Life
Xiaomi Redmi Note 9S
26:58
Samsung Galaxy A51
17:53
Web Browsing10:56 h07:15 h
Video Playback15:15 h11:25 h
Games05:45 h04:49 h
Standby Mode136 h81 h

Main camera

Matrix 48 MP 48 MP
Photo resolution 8000x6000 pixels 8000x6000 pixels
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K Recording No No
4K Recording Yes (Up to 30 fps) Yes (Up to 30 fps)
1080p Recording Yes (Up to 60 fps) Yes (Up to 30 fps)
Slow Motion 960 fps (720p) 960 fps (720p)
Wide-angle lens 119 ° 120 °
Lenses count Standard: 48 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
Matrix48 MP48 MP
Aperturef/1.8f/2.0
Focal length26 mm26 mm
SensorSamsung S5KGM2Sony IMX582
Sensor size1/21/2
Pixel size0.8 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 16 MP 32 MP
Photo resolution 4920x3264 pixels 6560x4928 pixels
Aperture f/2.5 f/2.2
Focal length n/a 26 mm
Sensor Omnivision OV16A1Q Samsung S5KGD1
Sensor size 1/3.06 1/2.8
Pixel size 1 μm 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 - Dual Band
- 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
- NAVIC		 - GPS
- GLONASS
- Beidou
- Galileo
NFC* No Yes
Infrared Port Yes No
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *NoNo
Hybrid SlotNoNo
2G BandsGSM 850 / 900 / 1800 / 2100 / 2600 / 2300 / 2500GSM 850 / 900 / 1800 / 2100 / 2600
3G BandsHSDPA 850 / 900 / 1900 / 2100UMTS 850 / 900 / 1900 / 2100
LTE Bands*LTE (B850/B900/B1800/B2100/B2300/B2500/B2600)LTE (B850/B900/B1800/B2100/B2600)
LTE category1212
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 Note 9S
81 dB
Samsung Galaxy A51
81.7 dB

Other

Class Mid-range Mid-range
Announced March, 2020 yr December, 2019 yr
Release Date April, 2020 yr December, 2019 yr
Launch Price ($) 200 399
Sensors - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

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