Home Phone comparison Samsung Galaxy S25 Ultra and Xiaomi Redmi K90 - Which is better?

Samsung Galaxy S25 Ultra vs Xiaomi Redmi K90

94 out 100
Samsung Galaxy S25 Ultra
VS
91 out 100
Xiaomi Redmi K90
Samsung Galaxy S25 Ultra
Xiaomi Redmi K90

Compared 2 smartphones : Samsung Galaxy S25 Ultra Manufactured in February, 2025, with display 6.9 with chipsetQualcomm Snapdragon 8 Elite, vs Xiaomi Redmi K90, Manufactured in October, 2025 with chipsetQualcomm Snapdragon 8 Elite. 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 S25 Ultra
  • Larger display: 6.9in
  • Supports DisplayPort
  • Supports Dolby Atmos
  • Built-in eSIM
Reasons to choose Xiaomi Redmi K90
  • Lighter design: 206g vs 218g
  • Higher battery capacity: 7100mAh vs 5000mAh
  • Infrared port
  • Includes charger

Versions

Available versions and configurations
Memory Options - 12/256 GB
- 12/512 GB
- 12/1024 GB
- 16/1024 GB		 - 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB
- 16/1024 GB

Review

Key Specs Samsung Galaxy S25 Ultra and Xiaomi Redmi K90
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 S25 Ultra
vs
Xiaomi Redmi K90

Display

Display quality comparison
Type Dynamic AMOLED OLED
Size 6.9 in 6.59 in
Resolution 1440x3120 pixels 1156x2510 pixels
Aspect ratio 19.5:9 19.5:9
Pixel density 498 ppi n/a
Refresh rate 120 Hz 120 Hz
Adaptive refresh rate Yes (1-120 Hz) Yes (1-120 Hz)
Max brightness 2600 nits n/a
HDR support Yes HDR10+ Yes, Dolby Vision
Touch Sampling Rate 240 Hz 480 Hz
Screen-to-body ratio 92.4 % 89.9 %
Features - DCI-P3
- Always-On Display
- DC dimming		 - DCI-P3
- Always-On Display
- DC dimming
Display test
Peak brightness (auto)
Samsung Galaxy S25 Ultra
1403 nits
Xiaomi Redmi K90
n/a
sRGB gamut97.7 %n/a
PWM (Flicker)240 Hzn/a
Response time1 msn/a
Contrast∞ Infiniten/a
Sources: NotebookCheck [Samsung Galaxy S25 Ultra]

Design & Build

Design and ergonomics comparison
Height 162.8 mm (6.41 in) 157.49 mm (6.2 in)
Width 77.6 mm (3.06 in) 75.25 mm (2.96 in)
Thickness 8.2 mm (0.32 in) 8 mm (0.31 in)
Weight 218 g (7.69 oz) 206 g (7.27 oz)
Water resistance IP68 IP68
Cooling system Vapor chamber Vapor chamber
Back panel Glass n/a
Frame Metal Metal
Colors - Black
- Silver
- Gray
- Blue		 - White
- Black
- Blue
- Purple
Fingerprint sensor Yes In-Display Yes, In-Display
Screen-to-body ratio
Samsung Galaxy S25 Ultra
92.4 %
Xiaomi Redmi K90
89.9 %

Performance

Testing Samsung Galaxy S25 Ultra and Xiaomi Redmi K90 In benchmarks
Processor
Chipset Qualcomm Snapdragon 8 Elite Qualcomm Snapdragon 8 Elite
Max Frequency 4470 MHz 4470 MHz
CPU Cores 8 (2 + 6) 8 (2 + 6)
Architecture - 6/3.53 (Oryon (Phoenix M))
- 2/4.32 (Oryon (Phoenix L))		 - 6/3.53 (Oryon (Phoenix M))
- 2/4.32 (Oryon (Phoenix L))
Process TSMC TSMC
Transistor Size 3 nm 3 nm
Neural Processor Hexagon Hexagon
Graphics Adreno 830 Adreno 830
GPU Cores 1536 1536
GPU Frequency 1100 MHz 1100 MHz
FLOPS 3379.2 GFLOPS 3379.2 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Samsung Galaxy S25 Ultra
3147
Xiaomi Redmi K90
2856
Geekbench 6 (Multi-Core)
Samsung Galaxy S25 Ultra
9750
Xiaomi Redmi K90
8814
Geekbench 6 (Single-Core)31472856
Geekbench 6 (Multi-Core)97508814
Geekbench Compute (GPU)2568124427
Sources: Geekbench v6 [Samsung Galaxy S25 Ultra], [Xiaomi Redmi K90]
AnTuTu 10
AnTuTu 10
Samsung Galaxy S25 Ultra
2795139
Xiaomi Redmi K90
3218814
CPU659871916055
GPU12941671150313
Memory471319513749
UX369782638697
NanoReview Score27951393218814

Memory

RAM
RAM Size - 12 GB
- 16 GB		 12 GB
Memory Type LPDDR5X LPDDR5X
Memory Frequency 5333 MHz 5300 MHz
Channels 2 4
Storage
Storage Capacity- 256 GB
- 512 GB
- 1024 GB		256 GB
Storage TypeUFS 4.0UFS 4.1
Memory CardNoNo

Software

OS Android 15 Android 16
OS Size 30.4 GB n/a
UI Skin One UI 7.0 HyperOS 3

Battery

Volume 5000 mAh 7100 mAh
Max Charging Power 45 W 100 W
Battery Type Li-ion Silicon Carbon (Si/C)
Removable No No
Wireless Charging Yes (25 W) No
Reverse Charging Yes (Wireless) Yes
Fast Charging Yes (72% in 30 min) Yes
Full Charge Time 0:59 h n/a
Battery Life Test
Battery Life
Samsung Galaxy S25 Ultra
31:10
Xiaomi Redmi K90
n/a
Web Browsing11:10 hn/a
Video Playback19:32 hn/a
Games06:22 hn/a
Standby Mode160 hn/a

Main camera

Matrix 200 MP 50 MP
Photo resolution 16320x12240 pixels 8192x6144 pixels
Zoom Optical, 5x Optical, 2.5x
Flash LED Dual LED
Stabilization Optical Optical
8K Recording Yes (Up to 30 fps) Yes (Up to 30 fps)
4K Recording Yes (Up to 120 fps) Yes (Up to 60 fps)
1080p Recording Yes (Up to 240 fps) Yes (Up to 60 fps)
Slow Motion 240 fps (1080p) 960 fps (1080p)
Wide-angle lens 120 ° 120 °
Lenses count Standard: 200 MP
Telephoto: 50 MP
Telephoto: 12 MP
Ultra-wide: 50 MP		 Standard: 50 MP
Telephoto: 50 MP
Ultra-wide: 50 MP
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
Main lens
Matrix200 MP50 MP
Aperturef/1.7f/1.9
Focal length23 mmn/a
SensorSamsung ISOCELL S5KHP2Omnivision OV50 Light Hunter 800
Sensor size1/1.31/1.55
Pixel size0.6 μm1 μm
AutofocusPhase autofocusPhase autofocus (Dual Pixel)
StabilizationOpticalOptical
Telephoto
Matrix50 MP50 MP
Aperturef/3.4f/3.0
Focal length111 mmn/a
SensorSony IMX854Omnivision OV50M
Sensor size1/2.521/2.76
Pixel size0.7 μm0.64 μm
StabilizationOpticalOptical
Ultra-wide lens
Matrix50 MP50 MP
Aperturef/1.9f/2.2
Focal length13 mmn/a
SensorSamsung ISOCELL S5KJN3Omnivision OV08F
Sensor size1/2.5n/a
Pixel size0.7 μmn/a
StabilizationDigitalDigital
Main camera DxOMark results
Photo quality
Samsung Galaxy S25 Ultra
144
Xiaomi Redmi K90
n/a
Video quality
Samsung Galaxy S25 Ultra
143
Xiaomi Redmi K90
n/a
Overall camera score
Samsung Galaxy S25 Ultra
146
Xiaomi Redmi K90
n/a
Bokeh70n/a
Preview81n/a
Zoom149n/a
Sources: DxOMark [Samsung Galaxy S25 Ultra]

Front camera

Matrix 12 MP 20 MP
Photo resolution 4000x3000 pixels n/a
Aperture f/2.2 f/2.2
Focal length 26 mm n/a
Sensor Samsung S5K3LU Omnivision OV20B
Sensor size 1/3.2 1/4
Pixel size 1.12 μm 0.8 μm
Autofocus Phase autofocus (Dual Pixel) n/a
Stabilization Digital Digital
Video resolution 2160p (4K) at 60 fps 1080p (Full HD) at 60 fps
TOF 3D sensor No No

Connectivity

Wi-Fi version Wi-Fi 7 (802.11 a/b/g/n/ac/ax/be) Wi-Fi 7 (802.11 a/b/g/n/ac/ax/be)
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 5.4
Bluetooth features LE LE
USB type USB Type-C USB Type-C
USB version 3.2 n/a
USB features - Charging
- USB Storage Mode
- OTG		 - Charging
- USB Storage Mode
- OTG
DisplayPort Yes DP 1.2 n/a
GPS - GPS
- GLONASS
- Beidou
- Galileo
- QZSS		 - GPS
- GLONASS
- Beidou
- Galileo
- QZSS
- NAVIC
NFC* Yes Yes
Infrared Port No Yes
Connectivity
SIM Count*12
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *YesNo
Hybrid SlotNoNo
2G BandsGSM850, GSM900, DCS1800, PCS1900n/a
3G BandsUMTS B1(2100),B2(1900),B4(AWS),B5(850),B8(900)n/a
LTE Bands*LTE (B1/B2/B3/B4/B5/B7/B8/B12/B13/B14/B18/B19/B20/B25/B26/B28/B29/B30/B66/B71)n/a
5G SupportYesYes

Sound

Speakers Stereo n/a
3.5 mm Jack No No
FM Radio No No
Dolby Atmos Yes n/a
Speaker Test
Max Volume
Samsung Galaxy S25 Ultra
93 dB
Xiaomi Redmi K90
n/a

Other

Class Flagship Flagship
Announced January, 2025 yr October, 2025 yr
Release Date February, 2025 yr October, 2025 yr
Launch Price ($) 1299 n/a
MSRP ($) n/a 370
Sensors - Hall Sensor
- Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included No Yes, 100 W

Note

Samsung Galaxy S25 Ultra:

Supports up to 2 eSIMs. The international model has 2 physical SIM slots, while the U.S. version has 1.","Uses Grade 5 titanium and Corning Gorilla Armor 2 glass on both sides.

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

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