Home Phone comparison Samsung Galaxy S21 Ultra and Xiaomi Redmi Note 17 - Which is better?

Samsung Galaxy S21 Ultra vs Xiaomi Redmi Note 17

67 out 100
Samsung Galaxy S21 Ultra
VS
65 out 100
Xiaomi Redmi Note 17
Samsung Galaxy S21 Ultra
Xiaomi Redmi Note 17

Compared 2 smartphones : Samsung Galaxy S21 Ultra Manufactured in February, 2021, with display 6.8 with chipsetSamsung Exynos 2100, vs Xiaomi Redmi Note 17, Manufactured in July, 2026 with chipsetQualcomm Snapdragon 4 Gen 4. 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
  • 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 Redmi Note 17
  • Larger display: 7in
  • Lighter design: 225g vs 227g
  • Higher battery capacity: 8000mAh vs 5000mAh
  • Infrared port
  • Includes charger

Versions

Available versions and configurations
Memory Options - 12/128 GB
- 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB		 - 6/128 GB
- 8/128 GB
- 8/256 GB

Review

Key Specs Samsung Galaxy S21 Ultra and Xiaomi Redmi Note 17
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.
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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 Redmi Note 17

Display

Display quality comparison
Type Dynamic AMOLED OLED
Size 6.8 in 7 in
Resolution 1440x3200 pixels 1080x2396 pixels
Aspect ratio 20:9 19.5:9
Pixel density 515 ppi 375 ppi
Refresh rate 120 Hz 120 Hz
Adaptive refresh rate Yes (10-120 Hz) Yes
Max brightness 1500 nits n/a
HDR support Yes HDR10+ Yes, HDR10+
Touch Sampling Rate n/a 240 Hz
Screen-to-body ratio 89.5 % 89.5 %
Features - DCI-P3
- Always-On Display		 - DCI-P3
- DC dimming
Display test
Peak brightness (auto)
Samsung Galaxy S21 Ultra
1019 nits
Xiaomi Redmi Note 17
n/a
Sources: NotebookCheck [Samsung Galaxy S21 Ultra]

Design & Build

Design and ergonomics comparison
Height 165.1 mm (6.5 in) 169.7 mm (6.68 in)
Width 75.6 mm (2.98 in) 79.14 mm (3.12 in)
Thickness 8.9 mm (0.35 in) 8.26 mm (0.33 in)
Weight 227 g (8.01 oz) 225 g (7.94 oz)
Water resistance IP68 IP65
Back panel Glass Plastic
Frame Metal Plastic
Colors - Black
- Silver
- Gray
- Blue		 - Black
- Blue
- Purple
Fingerprint sensor Yes In-Display Yes, In-Display
Screen-to-body ratio
Samsung Galaxy S21 Ultra
89.5 %
Xiaomi Redmi Note 17
89.5 %

Performance

Testing Samsung Galaxy S21 Ultra and Xiaomi Redmi Note 17 In benchmarks
Processor
Chipset Samsung Exynos 2100 Qualcomm Snapdragon 4 Gen 4
Max Frequency 2900 MHz 2300 MHz
CPU Cores 8 (1 + 3 + 4) 8 (2 + 6)
Architecture - 4/2.2 (Cortex-A55)
- 3/2.81 (Cortex-A78)
- 1/2.91 (Cortex-X1)		 - 6/2 (Cortex-A55)
- 2/2.3 (Cortex-A78)
Process Samsung Samsung
Transistor Size 5 nm 4 nm
Neural Processor Yes Yes
Graphics Mali-G78 MP14 n/a
GPU Cores 896 n/a
GPU Frequency 854 MHz n/a
FLOPS 1530.4 GFLOPS n/a
GeekBench v6
Geekbench 6 (Single-Core)
Samsung Galaxy S21 Ultra
1449
Xiaomi Redmi Note 17
900
Geekbench 6 (Multi-Core)
Samsung Galaxy S21 Ultra
3892
Xiaomi Redmi Note 17
2178
Geekbench 6 (Single-Core)1449900
Geekbench 6 (Multi-Core)38922178
AnTuTu 10
AnTuTu 10
Samsung Galaxy S21 Ultra
843008
Xiaomi Redmi Note 17
593849
CPU232358273209
GPU25635656148
Memory163007114369
UX191217150123
NanoReview Score843008593849
3DMark Wild Life
3DMark Wild Life
Samsung Galaxy S21 Ultra
5221
Xiaomi Redmi Note 17
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		 6 GB
Memory Type LPDDR5 LPDDR4X
Memory Frequency 2750 MHz 2133 MHz
Channels 2 2
Storage
Storage Capacity- 128 GB
- 256 GB
- 512 GB		128 GB
Storage TypeUFS 3.1UFS 2.2
Memory CardNoMicroSD

Software

OS Android 11 (Upgradeable to Android 14) Android 16
OS Size 26.4 GB n/a
UI Skin One UI 6 HyperOS 3

Battery

Volume 5000 mAh 8000 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 Redmi Note 17
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 n/a
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) 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
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
Main lens
Matrix108 MP50 MP
Aperturef/1.8f/1.8
Focal length26 mm26 mm
SensorSamsung S5KHM3n/a
Sensor size1/1.331/2.76 (0.36)
Pixel size0.8 μm0.64 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 Redmi Note 17
n/a
Video quality
Samsung Galaxy S21 Ultra
100
Xiaomi Redmi Note 17
n/a
Overall camera score
Samsung Galaxy S21 Ultra
115
Xiaomi Redmi Note 17
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 n/a
Aperture f/2.2 f/2.2
Focal length 26 mm n/a
Sensor Samsung S5KGH1 Omnivision OV08F
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 30 fps
TOF 3D sensor No No
Selfie camera DxOMark results
Photo quality
Samsung Galaxy S21 Ultra
133
Xiaomi Redmi Note 17
n/a
Video quality
Samsung Galaxy S21 Ultra
140
Xiaomi Redmi Note 17
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
NFC* Yes Yes
Infrared Port No Yes
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *YesNo
Hybrid SlotNoYes
2G BandsGSM 850, 900, 1800, 1900 MHzGSM850/GSM900/GSM1800
3G BandsWCDMA Band 1, 2, 4, 5, 8WCDMA 1/5/8
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/B3/B5/B8/B28/B34/B38/B39/B40/B41/B42/B48)
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 Redmi Note 17
n/a

Other

Class Flagship Mid-range
Announced January, 2021 yr July, 2026 yr
Release Date February, 2021 yr July, 2026 yr
Launch Price ($) 1200 n/a
MSRP ($) n/a 190
Sensors - Hall Sensor
- Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included n/a Yes, 45 W
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

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