Home Phone comparison Samsung Galaxy S21 Ultra and Xiaomi Poco M3 - Which is better?

Samsung Galaxy S21 Ultra vs Xiaomi Poco M3

67 out 100
Samsung Galaxy S21 Ultra
VS
45 out 100
Xiaomi Poco M3
Samsung Galaxy S21 Ultra
Xiaomi Poco M3

Compared 2 smartphones : Samsung Galaxy S21 Ultra Manufactured in February, 2021, with display 6.8 with chipsetSamsung Exynos 2100, vs Xiaomi Poco M3, Manufactured in December, 2020 with chipsetQualcomm Snapdragon 662. 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 Samsung Galaxy S21 Ultra
  • Larger display: 6.8in
  • Higher pixel density: 515ppi
  • Higher refresh rate: 120Hz
  • Newer Bluetooth version: 5.2 vs 5
  • Supports newer USB: 3.2 vs 2
  • Supports Dolby Atmos
  • Built-in eSIM
Reasons to choose Xiaomi Poco M3
  • Lighter design: 198g vs 227g
  • Higher battery capacity: 6000mAh vs 5000mAh
  • Infrared port

Versions

Available versions and configurations
Memory Options - 12/128 GB
- 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB		 - 4/64 GB
- 4/128 GB
- 6/64 GB
- 6/128 GB

Review

Key Specs Samsung Galaxy S21 Ultra and Xiaomi Poco M3
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.
Customize your score
Function
Importance (Weight)
Display:
Camera:
Performance:
Gaming:
Battery:
Connectivity:
Higher weight means greater impact on NanoReview score.

Tests & specs

Specs & test comparison
Smartphones:
Galaxy S21 Ultra
vs
Xiaomi Poco M3

Display

Display quality comparison
Type Dynamic AMOLED IPS LCD
Size 6.8 in 6.53 in
Resolution 1440x3200 pixels 1080x2340 pixels
Aspect ratio 20:9 19.5:9
Pixel density 515 ppi 395 ppi
Refresh rate 120 Hz 60 Hz
Adaptive refresh rate Yes (10-120 Hz) No
Max brightness 1500 nits 440 nits
HDR support Yes HDR10+ No
Screen-to-body ratio 89.5 % 83.4 %
Features - DCI-P3
- Always-On Display		 n/a
Display test
Peak brightness (auto)
Samsung Galaxy S21 Ultra
1019 nits
Xiaomi Poco M3
437 nits
sRGB gamutn/a96.5 %
PWM (Flicker)n/a892 Hz
Response timen/a36 ms
Contrastn/a2214:1
Sources: NotebookCheck [Samsung Galaxy S21 Ultra], [Xiaomi Poco M3]

Design & Build

Design and ergonomics comparison
Height 165.1 mm (6.5 in) 162.3 mm (6.39 in)
Width 75.6 mm (2.98 in) 77.3 mm (3.04 in)
Thickness 8.9 mm (0.35 in) 9.6 mm (0.38 in)
Weight 227 g (8.01 oz) 198 g (6.98 oz)
Water resistance IP68 No
Back panel Glass Plastic
Frame Metal Plastic
Colors - Black
- Silver
- Gray
- Blue		 - Black
- Blue
- Yellow
Fingerprint sensor Yes In-Display Yes In-Button
Screen-to-body ratio
Samsung Galaxy S21 Ultra
89.5 %
Xiaomi Poco M3
83.4 %

Performance

Testing Samsung Galaxy S21 Ultra and Xiaomi Poco M3 In benchmarks
Processor
Chipset Samsung Exynos 2100 Qualcomm Snapdragon 662
Max Frequency 2900 MHz 2000 MHz
CPU Cores 8 (1 + 3 + 4) 8 (4 + 4)
Architecture - 4/2.2 (Cortex-A55)
- 3/2.81 (Cortex-A78)
- 1/2.91 (Cortex-X1)		 - 4/1.8 (Kryo 260 Silver (Cortex-A53))
- 4/2 (Kryo 260 Gold (Cortex-A73))
Process Samsung Samsung
Transistor Size 5 nm 11 nm
Neural Processor Yes Hexagon 683
Graphics Mali-G78 MP14 Adreno 610
GPU Cores 896 128
GPU Frequency 854 MHz 950 MHz
FLOPS 1530.4 GFLOPS 243.2 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Samsung Galaxy S21 Ultra
1449
Xiaomi Poco M3
511
Geekbench 6 (Multi-Core)
Samsung Galaxy S21 Ultra
3892
Xiaomi Poco M3
1552
Geekbench 6 (Single-Core)1449511
Geekbench 6 (Multi-Core)38921552
AnTuTu 10
AnTuTu 10
Samsung Galaxy S21 Ultra
843008
Xiaomi Poco M3
243478
CPU23235886953
GPU25635634960
Memory16300760136
UX19121761429
NanoReview Score843008243478
3DMark Wild Life
3DMark Wild Life
Samsung Galaxy S21 Ultra
5221
Xiaomi Poco M3
372
Max Surface Temp.40.8 °C39.9 °C
Stability69 %99 %
Graphics Test31 fps2 fps
Graphics Score5221372
Sources: 3DMark [Samsung Galaxy S21 Ultra], [Xiaomi Poco M3]
PCMark 3.0
PCMark 3.0
Samsung Galaxy S21 Ultra
n/a
Xiaomi Poco M3
6158
Writing scoren/a6713
Web scoren/a5503
Video editingn/a3632
Data manipulationn/a5147
NanoReview Scoren/a6158

Memory

RAM
RAM Size - 12 GB
- 16 GB		 - 4 GB
- 6 GB
Memory Type LPDDR5 LPDDR4X
Memory Frequency 2750 MHz 1866 MHz
Channels 2 2
Storage
Storage Capacity- 128 GB
- 256 GB
- 512 GB		- 64 GB
- 128 GB
Storage TypeUFS 3.1UFS 2.1
Memory CardNoMicroSD

Software

OS Android 11 (Upgradeable to Android 14) Android 10 (Upgradeable to Android 11)
OS Size 26.4 GB 20.5 GB
UI Skin One UI 6 MIUI 12.5 Enhanced

Battery

Volume 5000 mAh 6000 mAh
Max Charging Power 25 W 18 W
Battery Type Li-ion Li-Po
Removable No No
Wireless Charging Yes (15 W) No
Reverse Charging Yes (Wireless) Yes
Fast Charging Yes (54% in 30 min) Yes (25% in 30 min)
Full Charge Time 1:11 h 3:00 h
Battery Life Test
Battery Life
Samsung Galaxy S21 Ultra
22:05
Xiaomi Poco M3
29:39
Web Browsing07:58 h11:51 h
Video Playback13:59 h15:49 h
Games05:14 h06:39 h
Standby Mode111 h155 h

Main camera

Matrix 108 MP 48 MP
Photo resolution 12000x9000 pixels 4000x3000 pixels
Zoom Optical, 10x Digital
Flash Dual LED LED
Stabilization Optical Digital
8K Recording Up to 24FPS No
4K Recording Yes (Up to 60 fps) No
1080p Recording Yes (Up to 60 fps) Yes (Up to 30 fps)
Slow Motion 960 fps (720p) 120 fps (720p)
Wide-angle lens 120 ° n/a
Lenses count Standard: 108 MP
Telephoto: 10 MP
Telephoto: 10 MP
Ultra-wide: 12 MP		 Standard: 48 MP
Macro: 2 MP
Depth: 2 MP
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
Main lens
Matrix108 MP48 MP
Aperturef/1.8f/1.8
Focal length26 mmn/a
SensorSamsung S5KHM3Samsung S5KGM1
Sensor size1/1.331/2.0
Pixel size0.8 μm0.8 μm
AutofocusLaser autofocusPhase autofocus
StabilizationOpticalDigital
Telephoto
Matrix10 MPn/a
Aperturef/4.9n/a
Focal length240 mmn/a
SensorSamsung S5K3J1n/a
Sensor size1/2.65n/a
Pixel size1.22 μmn/a
StabilizationOpticaln/a
Ultra-wide lens
Matrix12 MPn/a
Aperturef/2.2n/a
Focal length13 mmn/a
SensorSony IMX563n/a
Sensor size1/2.55n/a
Pixel size1.4 μmn/a
StabilizationDigitaln/a
Main camera DxOMark results
Photo quality
Samsung Galaxy S21 Ultra
121
Xiaomi Poco M3
n/a
Video quality
Samsung Galaxy S21 Ultra
100
Xiaomi Poco M3
n/a
Overall camera score
Samsung Galaxy S21 Ultra
115
Xiaomi Poco M3
n/a
Bokeh70n/a
Preview67n/a
Zoom106n/a
Sources: DxOMark [Samsung Galaxy S21 Ultra]

Front camera

Matrix 40 MP 8 MP
Photo resolution 7864x5200 pixels 3264x2448 pixels
Aperture f/2.2 f/2.1
Focal length 26 mm n/a
Sensor Samsung S5KGH1 CMOS
Sensor size 1/2.65 1/4.0
Pixel size 0.7 μm 1.12 μm
Autofocus Phase autofocus No
Stabilization Digital Digital
Video resolution 2160p (4K) at 60 fps 1080p (Full HD) at 30 fps
TOF 3D sensor No No
Selfie camera DxOMark results
Photo quality
Samsung Galaxy S21 Ultra
133
Xiaomi Poco M3
n/a
Video quality
Samsung Galaxy S21 Ultra
140
Xiaomi Poco M3
n/a

Connectivity

Wi-Fi version Wi-Fi 6E (802.11 a/b/g/n/ac/ax) Wi-Fi 5 (802.11 a/b/g/n/ac)
Wi-Fi features - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display		 - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5.2 5
Bluetooth features LE, A2DP LE, A2DP
USB type USB Type-C USB Type-C
USB version 3.2 2
USB features - Charging
- USB Storage Mode
- USB-Host mode
- OTG		 - Charging
- USB Storage Mode
- OTG
GPS - GPS
- GLONASS
- Beidou
- Galileo		 - GPS
- GLONASS
- Beidou
- Galileo
NFC* Yes No
Infrared Port No Yes
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *YesNo
Hybrid SlotNoNo
2G BandsGSM 850, 900, 1800, 1900 MHzGSM B2/3/5/8
3G BandsWCDMA Band 1, 2, 4, 5, 8WCDMA B1/2/4/5/8
LTE Bands*LTE (B1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B18/B19/B20/B25/B26/B28/B32/B38/B39/B40/B41/B66)LTE (B1/B2/B3/B4/B5/B7/B8/B20/B28)
LTE category2412
5G SupportYesNo

Sound

Speakers Stereo Stereo
3.5 mm Jack No Yes
FM Radio No Yes
Dolby Atmos Yes No
Speaker Test
Max Volume
Samsung Galaxy S21 Ultra
88 dB
Xiaomi Poco M3
85.1 dB

Other

Class Flagship Budget
Announced January, 2021 yr November, 2020 yr
Release Date February, 2021 yr December, 2020 yr
Launch Price ($) 1200 150
Sensors - Hall Sensor
- Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

After analyzing the data, we consider Samsung Galaxy S21 Ultra the clear winner in this comparison.

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