Samsung Galaxy M31 vs Galaxy A51

Here we compared two mid-range smartphones: the 6.4-inch Samsung Galaxy M31 (with Exynos 7 Octa 9611) that was released on February 25, 2020, against the Samsung Galaxy A51, which is powered by Exynos 9 Octa 9611 and came out 2 months before. On this page, you will find tests, full specs, strengths, and weaknesses of each of the gadgets.

Key differences

An overview of the main advantages of each smartphone
Reasons to consider the Samsung Galaxy M31
  • Comes with 2000 mAh larger battery capacity: 6000 vs 4000 mAh
  • 13% better performance in AnTuTu Benchmark (245K versus 217K)
  • Faster storage type - UFS 2.1 versus UFS 2.0
Reasons to consider the Samsung Galaxy A51
  • Slow-motion recording at 960FPS
  • More recent OS version: Android 13 versus 12
  • Weighs 19 grams less
  • 8% faster in single-core GeekBench 5 test: 352 and 327 points
We may receive a commission from Amazon for purchases made using the links below, but this has no bearing on our assessment methodology.

Review

Display
Screen quality, color accuracy, brightness
Performance
CPU/GPU performance in apps and games
Battery
Battery life, charging type and speed
Camera
Photo and video recording quality
Connectivity
Networks, ports, data transmission
NanoReview score
Final comparison evaluation

Value for money

You can enter your local price of these phones (in USD or any other currency) and click on the "Calculate" button to see which one has a better value for money.
Price

Tests and specifications

Comparison table of technical specifications and tests

Display

Type Super AMOLED Super AMOLED
Size 6.4 inches 6.5 inches
Resolution 1080 x 2340 pixels 1080 x 2400 pixels
Aspect ratio 19.5:9 20:9
PPI 403 ppi 405 ppi
Refresh rate 60 Hz 60 Hz
Max rated brightness 600 nits 400 nits
HDR support Yes, HDR10 No
Screen protection Corning Gorilla Glass 3 Corning Gorilla Glass 3
Screen-to-body ratio 84% 87.4%
Display features - Always-On Display - Always-On Display
Display tests
RGB color space 142% 98.8%
PWM 208 Hz 242 Hz
Response time 8.5 ms 25 ms
Contrast ∞ Infinity ∞ Infinity
Peak brightness test (auto)
616 nits
637 nits
Sources: NotebookCheck [3], [4]

Design and build

Height 159.2 mm (6.27 inches) 158.5 mm (6.24 inches)
Width 75.1 mm (2.96 inches) 73.6 mm (2.9 inches)
Thickness 8.9 mm (0.35 inches) 7.9 mm (0.31 inches)
Weight 191 g (6.74 oz) 172 g (6.07 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors Black, Blue, Red White, Black
Fingerprint scanner Yes, rear Yes, in-display
Screen-to-body ratio
87.4%

Performance

Tests of Samsung Galaxy M31 and Samsung Galaxy A51 in the benchmarks
SoC
Chipset Samsung Exynos 7 Octa 9611 Samsung Exynos 9 Octa 9611
Max. clock 2300 MHz 2300 MHz
CPU cores 8 (4 + 4) 8 (4 + 4)
Architecture - 4 cores at 1.7 GHz: Cortex-A53
- 4 cores at 2.3 GHz: Cortex-A73
- 4 cores at 1.7 GHz: Cortex-A53
- 4 cores at 2.3 GHz: Cortex-A73
Lithography process 10 nanometers 10 nanometers
Graphics Mali-G72 MP3 Mali-G72 MP3
GPU clock 850 MHz 850 MHz
FLOPS ~259 GFLOPS ~259 GFLOPS

Benchmarks

Geekbench 5 (Single-Core)
352
Geekbench 5 (Multi-Core)
1253
1298
AnTuTu Benchmark 9
Galaxy M31 +13%
245201
217818
CPU 62115 49711
GPU 56904 53719
Memory 51495 43824
UX 74539 70475
Total score 245201 217818
3DMark Wild Life Performance
820
Stability 74% 95%
Graphics test 4 FPS 4 FPS
Graphics score 820 812
Sources: 3DMark [3], [4]

Memory

RAM
RAM size 6 GB 4, 6 GB
Memory type LPDDR4X LPDDR4X
Memory clock 1866 MHz 1866 MHz
Channels 2 2
Storage
Storage size 128 GB 64, 128 GB
Storage type UFS 2.1 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 One UI 4.1 One UI 5.0
OS size 15 GB 23 GB

Battery

Specifications
Capacity 6000 mAh 4000 mAh
Charge power 15 W 15 W
Battery type Li-Ion Li-Po
Replaceable No No
Wireless charging No No
Reverse charging No No
Fast charging Yes, Samsung Adaptive Fast Charge (45% in 60 min) Yes (40% in 35 min)
Full charging time 2:25 hr 1:50 hr
Battery life tests
Web browsing - 09:34 hr
Watching video - 11:29 hr
Gaming - 05:12 hr
Standby - 83 hr
General battery life
26:33 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 64 megapixels 48 megapixels
Image resolution 9248 x 6920 8000 x 6000
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K video recording No No
4K video recording Up to 30FPS Up to 30FPS
1080p video recording Up to 30FPS Up to 30FPS
Slow motion 240 FPS (720p) 960 FPS (720p)
Angle of widest lens 123° 120°
Lenses 4 (64 MP + 8 MP + 5 MP + 5 MP) 4 (48 MP + 12 MP + 5 MP + 5 MP)
Wide (main) lens - 64 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/1.72", ISOCELL Bright GW1 (ISOCELL 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
- Focal length: 12 mm
- 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 - 5 MP
- Aperture: f/2.2
- 5 MP
- Aperture: f/2.4
- Focal length: 40 mm
- Pixel size: 1.12 micron
Depth lens - 5 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
- 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 32 megapixels 32 megapixels
Image resolution 6528 x 4896 6560 x 4928
Aperture f/2.0 f/2.2
Focal length 26 mm 26 mm
Pixel size 0.8 microns 0.8 microns
Sensor type CMOS ISOCELL CMOS
Sensor size 1/2.8" 1/2.8"
Video resolution 2160p (4K) 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 PBAP/PAB, PAN, OPP, MAP, HSP, HID, HFP, DIP, AVRCP, 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* Depends on the region Yes
Infrared port No 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* 12 12
5G support No No

Sound

Speakers Mono Mono
Headphone audio jack Yes Yes
FM radio Yes Yes
Dolby Atmos Yes Yes
Speakers test
Max. loudness
81.7 dB
81.7 dB

Other

Category Mid-range Mid-range
Announced February 2020 December 2019
Release date March 2020 December 2019
SAR (head) 0.48 W/kg 0.596 W/kg
SAR (body) 1.13 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 display, performance, and battery life are more important to you, then choose the Samsung Galaxy M31. But if the software, camera, and design are more of a priority – go for the Samsung Galaxy A51.

Cast your vote

So, which phone would you choose?
1566 (72.7%)
588 (27.3%)
Total votes: 2154

User opinions

You can share your opinion or ask a question in the comments below
Avatar
Hwjbs 14 March 2021 11:33
No way A51 is worth it
+5 Reply