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Xiaomi Redmi Note 9 vs Samsung Galaxy A51

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Xiaomi Redmi Note 9 vs Samsung Galaxy A51

52 out of 100
Xiaomi Redmi Note 9
VS
52 out of 100
Samsung Galaxy A51
Xiaomi Redmi Note 9
Samsung Galaxy A51

Here we compared two mid-range smartphones: the 6.53-inch Xiaomi Redmi Note 9 (with MediaTek Helio G85) that was released on April 30, 2020, against the Samsung Galaxy A51, which is powered by Exynos 9 Octa 9611 and came out 5 months before. On this page, you will find tests, full specs, strengths, and weaknesses of each of the devices.

  1. Differences
  2. Review
  3. Specs
  4. Benchmarks
  5. Battery life
  6. Camera
  7. Comments

Key differences

An overview of the main advantages of each smartphone
Reasons to consider the Xiaomi Redmi Note 9
  • Comes with 1020 mAh larger battery capacity: 5020 vs 4000 mAh
  • Shows 34% longer battery life (35:35 vs 26:33 hours)
  • 15% better performance in AnTuTu Benchmark (284K versus 246K)
  • Reverse charging feature
  • Has a built-in infrared port
Reasons to consider the Samsung Galaxy A51
  • Delivers 37% higher peak brightness (638 against 467 nits)
  • Slow-motion recording at 960FPS
  • Ability to record video in 4K resolution
  • More recent OS version: Android 13 versus 12
  • Super AMOLED display (versus competitor''s IPS LCD)
  • Faster storage type - UFS 2.0 versus eMMC 5.1
  • More energy-efficient CPU – Exynos 9 Octa 9611
  • Supports Dolby Atmos sound technology
  • Weighs 27 grams less
  • The front-facing camera can record video at 4K

Review

Evaluation of Xiaomi Redmi Note 9 and Samsung Galaxy A51 crucial features
Display
Screen quality, color accuracy, brightness
Camera
Photo and video recording quality
Performance
CPU and memory performance (apps, system)
Gaming
Capabilities for playing modern games
Battery
Battery life, charging type and speed
Connectivity
Networks, ports, data transmission
NanoReview Score
Final comparison evaluation

Value for money

Tests and specifications

Comparison table of technical specifications and tests
Phone:
Redmi Note 9
vs
Galaxy A51

Display

Type IPS LCD Super AMOLED
Size 6.53 inches 6.5 inches
Resolution 1080 x 2340 pixels 1080 x 2400 pixels
Aspect ratio 19.5:9 20:9
PPI 395 ppi 405 ppi
Refresh rate 60 Hz 60 Hz
Adaptive refresh rate No No
Max rated brightness 450 nits 400 nits
HDR support No No
Screen protection Corning Gorilla Glass 5 Corning Gorilla Glass 3
Screen-to-body ratio 83.5% 87.4%
Display features - - Always-On Display
Display tests
RGB color space 97.7% 98.8%
PWM Not detected 242 Hz
Response time 32.2 ms 25 ms
Contrast 4608:1 ∞ Infinity
Peak brightness test (auto)
Redmi Note 9
467 nits
Galaxy A51 +37%
638 nits

Design and build

Height 162.3 mm (6.39 inches) 158.5 mm (6.24 inches)
Width 77.2 mm (3.04 inches) 73.6 mm (2.9 inches)
Thickness 8.9 mm (0.35 inches) 7.9 mm (0.31 inches)
Weight 199 g (7.02 oz) 172 g (6.07 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors White, Gray, Green White, Black
Fingerprint scanner Yes, rear Yes, in-display
Screen-to-body ratio

Performance

Tests of Xiaomi Redmi Note 9 and Samsung Galaxy A51 in the benchmarks
SoC
Chipset MediaTek Helio G85 Samsung Exynos 9 Octa 9611
Max clock 2000 MHz 2300 MHz
CPU cores 8 (2 + 6) 8 (4 + 4)
Architecture - 6 cores at 1.8 GHz: Cortex-A55
- 2 cores at 2 GHz: Cortex-A75 		- 4 cores at 1.7 GHz: Cortex-A53
- 4 cores at 2.3 GHz: Cortex-A73
Lithography process 12 nanometers 10 nanometers
Graphics Mali-G52 MP2 Mali-G72 MP3
GPU shading units 48 54
GPU clock 1000 MHz 850 MHz
FLOPS ~96 GFLOPS ~91.8 GFLOPS

Benchmarks

Geekbench 6 (Single-Core)
Geekbench 6 (Multi-Core)
AnTuTu Benchmark 10
Redmi Note 9 +15%
284391
Galaxy A51
246594
CPU 96535 69792
GPU 47743 55670
Memory 67953 60677
UX 70021 59872
Total score 284391 246594
3DMark Wild Life Performance
Max surface temperature 39.2 °C 42.2 °C
Stability - 95%
Graphics test - 4 FPS
Graphics score - 812

Memory

RAM
RAM size 3, 4, 6 GB 4, 6 GB
Memory type LPDDR4X LPDDR4X
Memory clock 2133 MHz 1866 MHz
Channels 2 2
Storage
Storage size 64, 128 GB 64, 128 GB
Storage type eMMC 5.1 UFS 2.0
Memory card MicroSD MicroSD
Memory card max size Up to 512 GB Up to 512 GB

Software

Operating system Android 10 (Can be upgraded to Android 12) Android 10 (Can be upgraded to Android 13)
ROM MIUI 13 One UI 5.0
OS size 16.5 GB 23 GB

Battery

Capacity 5020 mAh 4000 mAh
Max charge power 18 W 15 W
Battery type Li-Po Li-Po
Replaceable No No
Wireless charging No No
Reverse charging Yes No
Fast charging Yes (50% in 40 min) Yes (40% in 35 min)
Full charging time 1:30 hr 1:50 hr
Battery life tests
Web browsing 12:34 hr 09:34 hr
Watching video 14:56 hr 11:29 hr
Gaming 05:48 hr 05:12 hr
Standby 120 hr 83 hr
General battery life
Redmi Note 9 +34%
35:35 hr
Galaxy A51
26:33 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 48 megapixels
Image resolution 8000 x 6000 8000 x 6000
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K video recording No No
4K video recording No Up to 30FPS
1080p video recording Up to 30FPS Up to 30FPS
Slow motion 120 FPS (720p) 960 FPS (720p)
Angle of widest lens 118° 120°
Lenses 4 (48 MP + 8 MP + 2 MP + 2 MP) 4 (48 MP + 12 MP + 5 MP + 5 MP)
Wide (main) lens - 48 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2.0", Samsung S5KGM1 (ISOCELL Plus CMOS)
- Phase autofocus
- 48 MP
- Aperture: f/2.0
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2", Sony IMX582 (Exmor-RS CMOS)
- Phase autofocus
Ultra-wide lens - 8 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
- 12 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.12 micron
Macro lens - 2 MP
- Aperture: f/2.4
- 5 MP
- Aperture: f/2.4
- Focal length: 40 mm
- Pixel size: 1.12 micron
Depth lens - 2 MP
- Aperture: f/2.4
- 5 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
Camera features - Bokeh mode
- Pro mode 		- Bokeh mode
- Pro mode
Selfie camera
Megapixels 13 megapixels 32 megapixels
Image resolution 4128 x 3096 6560 x 4928
Aperture f/2.3 f/2.2
Focal length 29 mm 26 mm
Pixel size 1.12 microns 0.8 microns
Sensor type CMOS ISOCELL CMOS
Sensor size 1/3.1" 1/2.8"
Video resolution 1080p (Full HD) at 30 FPS 2160p (4K) at 30 FPS

Connectivity

Wi-Fi standard Wi-Fi 5 (802.11 a/b/g/n/ac) Wi-Fi 5 (802.11 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 GPS, GLONASS, Beidou, Galileo
NFC * Yes Yes
Infrared port Yes No
Network
Number of SIM * 2 2
Type of SIM card Nano Nano
Multi SIM mode Standby Standby
eSIM support * No No
Hybrid slot No No
LTE Cat * 7 12
5G support No No

Sound

Speakers Mono Mono
Headphone audio jack Yes Yes
FM radio Yes Yes
Dolby Atmos No Yes
Speakers test
Max loudness
Redmi Note 9 +13%
92.4 dB
Galaxy A51
81.7 dB

Other

Category Mid-range Mid-range
Announced April 2020 December 2019
Release date June 2020 December 2019
SAR (head) 0.8 W/kg 0.596 W/kg
SAR (body) 1.14 W/kg 1.45 W/kg
Sensors - Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint 		- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
* Disclaimer! NFC, GSM network support, and some other specs can be different depending on the country.

Conclusion

If the battery life is more important to you, then choose the Xiaomi Redmi Note 9 . But if the display, camera, gaming, software, design, and sound are more of a priority – go for the Samsung Galaxy A51 .

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