Xiaomi Poco X6 Pro vs Samsung Galaxy S21 Ultra

Compared 2 smartphones : Xiaomi Poco X6 Pro Manufactured in January, 2024, with display 6.67 with chipsetMediaTek Dimensity 8300 Ultra, vs Samsung Galaxy S21 Ultra, Manufactured in February, 2021with chipsetSamsung Exynos 2100. Below are specs, tests, pros and cons for each device

Key Differences

Device key advantages
Reasons to choose Xiaomi Poco X6 Pro
  • Lighter design: 186g vs 227g
  • Newer Bluetooth version: 5.4 vs 5.2
  • Infrared port
  • Includes charger
Reasons to choose Samsung Galaxy S21 Ultra
  • Larger display: 6.8in
  • Higher pixel density: 515ppi
  • Supports newer USB: 3.2 vs 2
  • Built-in eSIM

Versions

Available versions and configurations
Memory Options - 8/256 GB
- 12/256 GB
- 12/512 GB
- 12/128 GB
- 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB

Review

Key Specs Xiaomi Poco X6 Pro and Samsung Galaxy S21 Ultra
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

Display

Display quality comparison
Type AMOLED Dynamic AMOLED
Size 6.67 in 6.8 in
Resolution 1220x2712 pixels 1440x3200 pixels
Aspect ratio 20:9 20:9
Pixel density 446 ppi 515 ppi
Refresh rate 120 Hz 120 Hz
Adaptive refresh rate Yes (30-120 Hz) Yes (10-120 Hz)
Max brightness n/a 1500 nits
HDR support Yes Dolby Vision Yes HDR10+
Touch Sampling Rate 480 Hz n/a
Screen-to-body ratio 90 % 89.5 %
Features - DCI-P3
- Always-On Display
- DC dimming
- DCI-P3
- Always-On Display
Display test
Peak brightness (auto)
Xiaomi Poco X6 Pro
1156 nits
Samsung Galaxy S21 Ultra
1019 nits
sRGB gamut99.7 %n/a
PWM (Flicker)1923 Hzn/a
Response time1 msn/a
Contrast∞ Infiniten/a

Design & Build

Design and ergonomics comparison
Height 160.45 mm (6.32 in) 165.1 mm (6.5 in)
Width 74.34 mm (2.93 in) 75.6 mm (2.98 in)
Thickness 8.25 mm (0.32 in) 8.9 mm (0.35 in)
Weight 186 g (6.56 oz) 227 g (8.01 oz)
Water resistance IP54 IP68
Cooling system Vapor chamber n/a
Back panel Plastic Glass
Frame Plastic Metal
Colors - Black
- Gray
- Yellow
- Black
- Silver
- Gray
- Blue
Fingerprint sensor Yes In-Display Yes In-Display
Screen-to-body ratio
Xiaomi Poco X6 Pro
90 %
Samsung Galaxy S21 Ultra
89.5 %

Performance

Testing Xiaomi Poco X6 Pro and Samsung Galaxy S21 Ultra In benchmarks
Processor
Chipset MediaTek Dimensity 8300 Ultra Samsung Exynos 2100
Max Frequency 3350 MHz 2900 MHz
CPU Cores 8 (1 + 3 + 4) 8 (1 + 3 + 4)
Architecture - 4/2.2 (Cortex-A510)
- 3/3.2 (Cortex-A715)
- 1/3.35 (Cortex-A715)
- 4/2.2 (Cortex-A55)
- 3/2.81 (Cortex-A78)
- 1/2.91 (Cortex-X1)
Process TSMC Samsung
Transistor Size 4 nm 5 nm
Neural Processor MediaTek APU 780 Yes
Graphics Mali-G615 MP6 Mali-G78 MP14
GPU Cores 768 896
GPU Frequency 1400 MHz 854 MHz
FLOPS 2150.4 GFLOPS 1530.4 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Xiaomi Poco X6 Pro
1502
Samsung Galaxy S21 Ultra
1449
Geekbench 6 (Multi-Core)
Xiaomi Poco X6 Pro
4779
Samsung Galaxy S21 Ultra
3892
Geekbench 6 (Single-Core)15021449
Geekbench 6 (Multi-Core)47793892
Geekbench Compute (GPU)4842n/a
AnTuTu 10
AnTuTu 10
Xiaomi Poco X6 Pro
1407210
Samsung Galaxy S21 Ultra
843008
CPU296205232358
GPU539596256356
Memory318606163007
UX252803191217
NanoReview Score1407210843008
3DMark Wild Life
3DMark Wild Life
Xiaomi Poco X6 Pro
n/a
Samsung Galaxy S21 Ultra
5221
Max Surface Temp.n/a40.8 °C
Stabilityn/a69 %
Graphics Testn/a31 fps
Graphics Scoren/a5221

Memory

RAM
RAM Size 8 GB - 12 GB
- 16 GB
Memory Type LPDDR5X LPDDR5
Memory Frequency 4200 MHz 2750 MHz
Channels 4 2
Storage
Storage Capacity256 GB- 128 GB
- 256 GB
- 512 GB
Storage TypeUFS 4.0UFS 3.1
Memory CardNoNo

Software

OS Android 14 (Upgradeable to Android 15) Android 11 (Upgradeable to Android 14)
OS Size 36 GB 26.4 GB
UI Skin HyperOS 2.0 One UI 6

Battery

Volume 5000 mAh 5000 mAh
Max Charging Power 67 W 25 W
Battery Type Li-Po Li-ion
Removable No No
Wireless Charging No Yes (15 W)
Reverse Charging No Yes (Wireless)
Fast Charging Yes (50% in 18 min) Yes (54% in 30 min)
Full Charge Time 0:45 h 1:11 h
Battery Life Test
Battery Life
Xiaomi Poco X6 Pro
21:20
Samsung Galaxy S21 Ultra
22:05
Web Browsing08:53 h07:58 h
Video Playback12:36 h13:59 h
Games05:17 h05:14 h
Standby Mode101 h111 h

Main camera

Matrix 64 MP 108 MP
Photo resolution 9000x7000 pixels 12000x9000 pixels
Zoom Digital Optical, 10x
Flash LED Dual LED
Stabilization Optical Optical
8K Recording No Up to 24FPS
4K Recording Yes (Up to 30 fps) Yes (Up to 60 fps)
1080p Recording Yes (Up to 60 fps) Yes (Up to 60 fps)
Slow Motion 1920 fps (720p) 960 fps (720p)
Wide-angle lens 120 ° 120 °
Lenses count Standard: 64 MP
Ultra-wide: 8 MP
Macro: 2 MP
Standard: 108 MP
Telephoto: 10 MP
Telephoto: 10 MP
Ultra-wide: 12 MP
Features - Bokeh effect
- Pro mode
- Bokeh effect
- Pro mode
- RAW support
Main lens
Matrix64 MP108 MP
Aperturef/1.7f/1.8
Focal length25 mm26 mm
SensorOmnivision OV64BSamsung S5KHM3
Sensor size1/21/1.33
Pixel size0.7 μm0.8 μm
AutofocusPhase autofocusLaser autofocus
StabilizationOpticalOptical
Telephoto
Matrixn/a10 MP
Aperturen/af/4.9
Focal lengthn/a240 mm
Sensorn/aSamsung S5K3J1
Sensor sizen/a1/2.65
Pixel sizen/a1.22 μm
Stabilizationn/aOptical
Ultra-wide lens
Matrix8 MP12 MP
Aperturef/2.2f/2.2
Focal lengthn/a13 mm
SensorOmnivision OV08D10Sony IMX563
Sensor size1/41/2.55
Pixel size1.12 μm1.4 μm
StabilizationDigitalDigital
Main camera DxOMark results
Photo quality
Xiaomi Poco X6 Pro
n/a
Samsung Galaxy S21 Ultra
121
Video quality
Xiaomi Poco X6 Pro
n/a
Samsung Galaxy S21 Ultra
100
Overall camera score
Xiaomi Poco X6 Pro
n/a
Samsung Galaxy S21 Ultra
115
Bokehn/a70
Previewn/a67
Zoomn/a106

Front camera

Matrix 16 MP 40 MP
Photo resolution 4608x3456 pixels 7864x5200 pixels
Aperture f/2.6 f/2.2
Focal length n/a 26 mm
Sensor Omnivision OV16A1Q Samsung S5KGH1
Sensor size 1/3.06 1/2.65
Pixel size 1 μm 0.7 μm
Autofocus No Phase autofocus
Stabilization Digital Digital
Video resolution 1080p (Full HD) at 60 fps 2160p (4K) at 60 fps
TOF 3D sensor No No
Selfie camera DxOMark results
Photo quality
Xiaomi Poco X6 Pro
n/a
Samsung Galaxy S21 Ultra
133
Video quality
Xiaomi Poco X6 Pro
n/a
Samsung Galaxy S21 Ultra
140

Connectivity

Wi-Fi version Wi-Fi 6 (802.11 a/b/g/n/ac/ax) Wi-Fi 6E (802.11 a/b/g/n/ac/ax)
Wi-Fi features - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
- Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5.4 5.2
Bluetooth features LE LE, A2DP
USB type USB Type-C USB Type-C
USB version 2 3.2
USB features - Charging
- USB Storage Mode
- OTG
- Charging
- USB Storage Mode
- USB-Host mode
- OTG
DisplayPort No n/a
GPS - GPS
- GLONASS
- Beidou
- Galileo
- QZSS
- GPS
- GLONASS
- Beidou
- Galileo
NFC* Varies by region Yes
Infrared Port Yes No
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *NoYes
Hybrid SlotNoNo
2G BandsGSM 850/900/1800/1900MHzGSM 850, 900, 1800, 1900 MHz
3G BandsWCDMA B1/2/4/5/6/8/19WCDMA Band 1, 2, 4, 5, 8
LTE Bands*LTE (B1/B2/B3/B4/B5/B7/B8/B18/B19/B20/B28/B66)LTE (B1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B18/B19/B20/B25/B26/B28/B32/B38/B39/B40/B41/B66)
LTE categoryn/a24
5G SupportYesYes

Sound

Speakers n/a Stereo
3.5 mm Jack No No
FM Radio No No
Dolby Atmos Yes Yes
Speaker Test
Max Volume
Xiaomi Poco X6 Pro
90.3 dB
Samsung Galaxy S21 Ultra
88 dB

Other

Class Mid-range Flagship
Announced January, 2024 yr January, 2021 yr
Release Date January, 2024 yr February, 2021 yr
Launch Price ($) n/a 1200
MSRP ($) 299 n/a
Sensors - Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
- Hall Sensor
- Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included Yes 67 W n/a

Note

Xiaomi Poco X6 Pro:

There is an eco-leather version of the X6 Pro that is 4 grams heavier and 0.10 thicker.

* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

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