Home Phone comparison Samsung Galaxy S21 Ultra and Xiaomi Poco M8 5G - Which is better?

Samsung Galaxy S21 Ultra vs Xiaomi Poco M8 5G

67 out 100
Samsung Galaxy S21 Ultra
VS
60 out 100
Xiaomi Poco M8 5G
Samsung Galaxy S21 Ultra
Xiaomi Poco M8 5G

Compared 2 smartphones : Samsung Galaxy S21 Ultra Manufactured in February, 2021, with display 6.8 with chipsetSamsung Exynos 2100, vs Xiaomi Poco M8 5G, Manufactured in January, 2026with chipsetQualcomm Snapdragon 6 Gen 3. 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
  • Newer Bluetooth version: 5.2 vs 5.1
  • Supports newer USB: 3.2 vs 2
  • Supports Dolby Atmos
  • Built-in eSIM
Reasons to choose Xiaomi Poco M8 5G
  • Lighter design: 178g vs 227g
  • Higher battery capacity: 5520mAh 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		 - 8/256 GB
- 8/512 GB

Review

Key Specs Samsung Galaxy S21 Ultra and Xiaomi Poco M8 5G
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 M8 5G

Display

Display quality comparison
Type Dynamic AMOLED AMOLED
Size 6.8 in 6.77 in
Resolution 1440x3200 pixels 1080x2340 pixels
Aspect ratio 20:9 n/a
Pixel density 515 ppi 388 ppi
Refresh rate 120 Hz 120 Hz
Adaptive refresh rate Yes (10-120 Hz) Yes (60-120 Hz)
Max brightness 1500 nits 800 nits
HDR support Yes HDR10+ Yes, HDR10+
Screen-to-body ratio 89.5 % 89.7 %
Features - DCI-P3
- Always-On Display		 DCI-P3
Display test
Peak brightness (auto)
Samsung Galaxy S21 Ultra
1019 nits
Xiaomi Poco M8 5G
n/a
Sources: NotebookCheck [Samsung Galaxy S21 Ultra]

Design & Build

Design and ergonomics comparison
Height 165.1 mm (6.5 in) 164 mm (6.46 in)
Width 75.6 mm (2.98 in) 75.4 mm (2.97 in)
Thickness 8.9 mm (0.35 in) 7.4 mm (0.29 in)
Weight 227 g (8.01 oz) 178 g (6.28 oz)
Water resistance IP68 IP65
Back panel Glass Plastic
Frame Metal Plastic
Colors - Black
- Silver
- Gray
- Blue		 - Black
- Silver
- Green
Fingerprint sensor Yes In-Display Yes, In-Display
Screen-to-body ratio
Samsung Galaxy S21 Ultra
89.5 %
Xiaomi Poco M8 5G
89.7 %

Performance

Testing Samsung Galaxy S21 Ultra and Xiaomi Poco M8 5G In benchmarks
Processor
Chipset Samsung Exynos 2100 Qualcomm Snapdragon 6 Gen 3
Max Frequency 2900 MHz 2400 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 (Cortex-A55)
- 4/2.4 (Cortex-A78)
Process Samsung Samsung
Transistor Size 5 nm 4 nm
Neural Processor Yes Hexagon
Graphics Mali-G78 MP14 Adreno 710
GPU Cores 896 256
GPU Frequency 854 MHz 1010 MHz
FLOPS 1530.4 GFLOPS 517.1 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Samsung Galaxy S21 Ultra
1449
Xiaomi Poco M8 5G
1020
Geekbench 6 (Multi-Core)
Samsung Galaxy S21 Ultra
3892
Xiaomi Poco M8 5G
2853
Geekbench 6 (Single-Core)14491020
Geekbench 6 (Multi-Core)38922853
AnTuTu 10
AnTuTu 10
Samsung Galaxy S21 Ultra
843008
Xiaomi Poco M8 5G
638701
CPU232358197012
GPU256356145492
Memory163007145821
UX191217150376
NanoReview Score843008638701
3DMark Wild Life
3DMark Wild Life
Samsung Galaxy S21 Ultra
5221
Xiaomi Poco M8 5G
n/a
Max Surface Temp.40.8 °Cn/a
Stability69 %n/a
Graphics Test31 fpsn/a
Graphics Score5221n/a
Sources: 3DMark [Samsung Galaxy S21 Ultra]

Memory

RAM
RAM Size - 12 GB
- 16 GB		 8 GB
Memory Type LPDDR5 LPDDR4X
Memory Frequency 2750 MHz 2133 MHz
Channels 2 2
Storage
Storage Capacity- 128 GB
- 256 GB
- 512 GB		256 GB
Storage TypeUFS 3.1UFS 2.2
Memory CardNoNo

Software

OS Android 11 (Upgradeable to Android 14) Android 15
OS Size 26.4 GB n/a
UI Skin One UI 6 HyperOS 2.0

Battery

Volume 5000 mAh 5520 mAh
Max Charging Power 25 W 45 W
Battery Type Li-ion Silicon Carbon (Si/C)
Removable No No
Wireless Charging Yes (15 W) No
Reverse Charging Yes (Wireless) Yes
Fast Charging Yes (54% in 30 min) Yes
Full Charge Time 1:11 h n/a
Battery Life Test
Battery Life
Samsung Galaxy S21 Ultra
22:05
Xiaomi Poco M8 5G
n/a
Web Browsing07:58 hn/a
Video Playback13:59 hn/a
Games05:14 hn/a
Standby Mode111 hn/a

Main camera

Matrix 108 MP 50 MP
Photo resolution 12000x9000 pixels 8192x6144 pixels
Zoom Optical, 10x Digital
Flash Dual LED LED
Stabilization Optical Optical
8K Recording Up to 24FPS No
4K Recording Yes (Up to 60 fps) Yes (Up to 30 fps)
1080p Recording Yes (Up to 60 fps) Yes (Up to 60 fps)
Slow Motion 960 fps (720p) n/a
Wide-angle lens 120 ° n/a
Lenses count Standard: 108 MP
Telephoto: 10 MP
Telephoto: 10 MP
Ultra-wide: 12 MP		 Standard: 50 MP
Depth
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
Main lens
Matrix108 MP50 MP
Aperturef/1.8f/1.8
Focal length26 mmn/a
SensorSamsung S5KHM3Omnivision OV50D40 Light Hunter 400
Sensor size1/1.331/2.88 (0.35)
Pixel size0.8 μm0.61 μm
AutofocusLaser autofocusPhase autofocus
StabilizationOpticalOptical
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 M8 5G
n/a
Video quality
Samsung Galaxy S21 Ultra
100
Xiaomi Poco M8 5G
n/a
Overall camera score
Samsung Galaxy S21 Ultra
115
Xiaomi Poco M8 5G
n/a
Bokeh70n/a
Preview67n/a
Zoom106n/a
Sources: DxOMark [Samsung Galaxy S21 Ultra]

Front camera

Matrix 40 MP 20 MP
Photo resolution 7864x5200 pixels n/a
Aperture f/2.2 f/2.2
Focal length 26 mm n/a
Sensor Samsung S5KGH1 n/a
Sensor size 1/2.65 n/a
Pixel size 0.7 μm n/a
Autofocus Phase autofocus No
Stabilization Digital Digital
Video resolution 2160p (4K) at 60 fps 1080p (Full HD) at 60 fps
TOF 3D sensor No No
Selfie camera DxOMark results
Photo quality
Samsung Galaxy S21 Ultra
133
Xiaomi Poco M8 5G
n/a
Video quality
Samsung Galaxy S21 Ultra
140
Xiaomi Poco M8 5G
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 5.1
Bluetooth features LE, A2DP LE
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
DisplayPort n/a No
GPS - GPS
- GLONASS
- Beidou
- Galileo		 - GPS
- GLONASS
- Beidou
- Galileo
- QZSS
NFC* Yes Varies by region
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 MHzn/a
3G BandsWCDMA Band 1, 2, 4, 5, 8n/a
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)n/a
LTE category24n/a
5G SupportYesYes

Sound

Speakers Stereo n/a
3.5 mm Jack No No
FM Radio No Yes
Dolby Atmos Yes n/a
Speaker Test
Max Volume
Samsung Galaxy S21 Ultra
88 dB
Xiaomi Poco M8 5G
n/a

Other

Class Flagship Mid-range
Announced January, 2021 yr January, 2026 yr
Release Date February, 2021 yr January, 2026 yr
Launch Price ($) 1200 n/a
MSRP ($) n/a 229
Sensors - Hall Sensor
- Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint 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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