Home Phone comparison Xiaomi 15 Ultra and Xiaomi Poco X8 - Which is better?

Xiaomi 15 Ultra vs Xiaomi Poco X8

95 out 100
Xiaomi 15 Ultra
VS
70 out 100
Xiaomi Poco X8
Xiaomi 15 Ultra
Xiaomi Poco X8

Compared 2 smartphones : Xiaomi 15 Ultra Manufactured in February, 2025, with display 6.73 with chipsetQualcomm Snapdragon 8 Elite, vs Xiaomi Poco X8, Manufactured in September, 2026 with chipsetQualcomm Snapdragon 6s 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 Xiaomi 15 Ultra
  • Higher pixel density: 522ppi
  • Newer Bluetooth version: 6.0 vs 5.1
  • Supports newer USB: 3.2 vs 2
  • Supports DisplayPort
Reasons to choose Xiaomi Poco X8
  • Larger display: 6.83in
  • Lighter design: 223g vs 226g
  • Higher battery capacity: 8340mAh vs 5410mAh

Versions

Available versions and configurations
Memory Options - 12/256 GB
- 16/512 GB
- 16/1024 GB		 - 6/128 GB
- 8/256 GB
- 12/256 GB

Review

Key Specs Xiaomi 15 Ultra and Xiaomi Poco X8
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:
Xiaomi 15 Ultra
vs
Xiaomi Poco X8

Display

Display quality comparison
Type AMOLED AMOLED
Size 6.73 in 6.83 in
Resolution 1440x3200 pixels 1280x2772 pixels
Aspect ratio 20:9 19.5:9
Pixel density 522 ppi 447 ppi
Refresh rate 120 Hz 120 Hz
Adaptive refresh rate Yes (1-120 Hz) Yes
Max brightness n/a 1060 nits
HDR support Yes Dolby Vision Yes, HDR10+
Touch Sampling Rate 300 Hz 240 Hz
Screen-to-body ratio 90 % 89.5 %
Features - DCI-P3
- Always-On Display
- DC dimming		 - DCI-P3
- DC dimming
Display test
Peak brightness (auto)
Xiaomi 15 Ultra
1599 nits
Xiaomi Poco X8
n/a
sRGB gamut99.7 %n/a
PWM (Flicker)120 Hzn/a
Response time1 msn/a
Contrast∞ Infiniten/a
Sources: NotebookCheck [Xiaomi 15 Ultra]

Design & Build

Design and ergonomics comparison
Height 161.3 mm (6.35 in) 163.45 mm (6.44 in)
Width 75.3 mm (2.96 in) 78.27 mm (3.08 in)
Thickness 9.35 mm (0.37 in) 8.6 mm (0.34 in)
Weight 226 g (7.97 oz) 223 g (7.87 oz)
Water resistance IP68 IP69
Cooling system Vapor chamber n/a
Back panel Glass Plastic
Frame Metal Plastic
Colors - White
- Black
- Silver
- Green		 - White
- Black
- Orange
- Purple
Fingerprint sensor Yes In-Display Yes, In-Display
Screen-to-body ratio
Xiaomi 15 Ultra
90 %
Xiaomi Poco X8
89.5 %

Performance

Testing Xiaomi 15 Ultra and Xiaomi Poco X8 In benchmarks
Processor
Chipset Qualcomm Snapdragon 8 Elite Qualcomm Snapdragon 6s Gen 4
Max Frequency 4320 MHz 2400 MHz
CPU Cores 8 (2 + 6) 8 (4 + 4)
Architecture - 6/3.53 (Oryon (Phoenix M))
- 2/4.32 (Oryon (Phoenix L))		 - 4/1.8 (Cortex-A55)
- 4/2.4 (Cortex-A78)
Process TSMC Samsung
Transistor Size 3 nm 4 nm
Neural Processor Hexagon Hexagon
Graphics Adreno 830 n/a
GPU Cores 1536 n/a
GPU Frequency 1100 MHz n/a
FLOPS 3379.2 GFLOPS n/a
GeekBench v6
Geekbench 6 (Single-Core)
Xiaomi 15 Ultra
3008
Xiaomi Poco X8
1005
Geekbench 6 (Multi-Core)
Xiaomi 15 Ultra
9065
Xiaomi Poco X8
2871
Geekbench 6 (Single-Core)30081005
Geekbench 6 (Multi-Core)90652871
Sources: Geekbench v6 [Xiaomi 15 Ultra]
AnTuTu 10
AnTuTu 10
Xiaomi 15 Ultra
2544373
Xiaomi Poco X8
832323
CPU558586291065
GPU1040161131411
Memory520300172533
UX425326237314
NanoReview Score2544373832323

Memory

RAM
RAM Size 12 GB 6 GB
Memory Type LPDDR5X LPDDR4X
Memory Frequency 5333 MHz 2133 MHz
Channels 2 2
Storage
Storage Capacity256 GB128 GB
Storage TypeUFS 4.1UFS 3.1
Memory CardNoNo

Software

OS Android 15 Android 16
OS Size 23.9 GB n/a
UI Skin HyperOS 2.0 HyperOS 3

Battery

Volume 5410 mAh 8340 mAh
Max Charging Power 90 W 67 W
Battery Type Silicon Carbon (Si/C) Silicon Carbon (Si/C)
Removable No No
Wireless Charging Yes (80 W) No
Reverse Charging Yes (Wireless) Yes
Fast Charging Yes (72% in 30 min) Yes
Full Charge Time 0:51 h n/a
Battery Life Test
Battery Life
Xiaomi 15 Ultra
30:03
Xiaomi Poco X8
n/a
Web Browsing12:19 hn/a
Video Playback18:43 hn/a
Games06:45 hn/a
Standby Mode141 hn/a

Main camera

Matrix 50 MP 50 MP
Photo resolution 8192x6144 pixels 8192x6144 pixels
Zoom Optical, 4.3x Digital
Flash Dual LED LED
Stabilization Optical Optical
8K Recording Yes (Up to 30 fps) No
4K Recording Yes (Up to 120 fps) No
1080p Recording Yes (Up to 60 fps) Yes (Up to 30 fps)
Slow Motion 1920 fps (1080p) n/a
Wide-angle lens 115 ° n/a
Lenses count Standard: 50 MP
Telephoto: 200 MP
Telephoto: 50 MP
Ultra-wide: 50 MP
Depth		 Standard: 50 MP
Depth
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
Main lens
Matrix50 MP50 MP
Aperturef/1.63f/1.8
Focal length23 mm26 mm
SensorSony LYT-900Samsung S5KJN5
Sensor size1/1.01/2.76 (0.36)
Pixel size1.6 μm0.64 μm
AutofocusLaser autofocusPhase autofocus
StabilizationOpticalOptical
Telephoto
Matrix200 MPn/a
Aperturef/2.6n/a
Focal length100 mmn/a
SensorSamsung ISOCELL S5KHP9n/a
Sensor size1/1.4n/a
Pixel size0.56 μmn/a
StabilizationOpticaln/a
Ultra-wide lens
Matrix50 MPn/a
Aperturef/2.2n/a
Focal length14 mmn/a
SensorSamsung S5KJN5n/a
Sensor size1/2.76n/a
Pixel size0.64 μmn/a
StabilizationDigitaln/a
Main camera DxOMark results
Photo quality
Xiaomi 15 Ultra
158
Xiaomi Poco X8
n/a
Video quality
Xiaomi 15 Ultra
134
Xiaomi Poco X8
n/a
Overall camera score
Xiaomi 15 Ultra
153
Xiaomi Poco X8
n/a
Bokeh80n/a
Preview89n/a
Sources: DxOMark [Xiaomi 15 Ultra]

Front camera

Matrix 32 MP 16 MP
Photo resolution 6528x4896 pixels n/a
Aperture f/2.0 f/2.4
Focal length 22 mm 1 mm
Sensor Omnivision OV32B Omnivision OV08F
Sensor size 1/3.14 n/a
Pixel size 0.7 μm n/a
Autofocus No No
Stabilization Digital Digital
Video resolution 2160p (4K) at 60 fps 1080p (Full HD) at 30 fps
TOF 3D sensor No No

Connectivity

Wi-Fi version Wi-Fi 7 (802.11 a/b/g/n/ac/ax/be) 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 6.0 5.1
Bluetooth features LE LE
USB type USB Type-C USB Type-C
USB version 3.2 2
USB features - Charging
- USB Storage Mode
- OTG		 - Charging
- USB Storage Mode
- OTG
DisplayPort Yes No
GPS - GPS
- GLONASS
- Beidou
- Galileo
- QZSS
- NAVIC		 - GPS
- GLONASS
- Beidou
- Galileo
NFC* Yes Yes
Infrared Port Yes Yes
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *YesYes
Hybrid SlotNoNo
2G BandsGSM 2/3/5/8GSM B2/B3/B5/B8
3G BandsWCDMA 1/2/4/5/6/8/19WCDMA B1/B2/B4/B5/B
LTE Bands*LTE (B1/B2/B3/B4/B5/B7/B8/B12/B17/B18/B19/B20/B26/B28/B34/B38/B39/B40/B41/B42/B48/B66)LTE (B1/B2/B3/B4/B5/B7/B8/B18/B19/B20/B26/B28/B66/B71)
5G SupportYesYes

Sound

3.5 mm Jack No No
FM Radio No No
Dolby Atmos Yes Yes
Speaker Test
Max Volume
Xiaomi 15 Ultra
92.1 dB
Xiaomi Poco X8
n/a

Other

Class Flagship Mid-range
Announced February, 2025 yr September, 2026 yr
Release Date February, 2025 yr September, 2026 yr
MSRP ($) 1099 399
Sensors - Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included Yes 90 W Yes, 67 W

Note

Xiaomi 15 Ultra:

The Chinese version of the Xiaomi 15 Ultra has a 6000 mAh battery, while the international model comes with 5410 mAh, leading to a noticeable difference in battery life.

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

Results

After analyzing the data, we consider Xiaomi 15 Ultra the clear winner in this comparison.

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