Xiaomi Mi 9 vs Xiaomi 12X

Here we compared two flagship smartphones: the 6.39-inch Xiaomi Mi 9 (with Qualcomm Snapdragon 855) that was released on February 20, 2019, against the Xiaomi 12X, which is powered by Qualcomm Snapdragon 870 and came out 35 months after. On this page, you will find tests, full specs, strengths, and weaknesses of each of the gadgets.

Key differences

An overview of the main advantages of each smartphone
Reasons to consider the Xiaomi Mi 9
  • The rear camera has a 2x optical zoom
  • Supports wireless charging up to 20W
Reasons to consider the Xiaomi 12X
  • Higher display refresh rate – 120 Hz
  • Comes with 1200 mAh larger battery capacity: 4500 vs 3300 mAh
  • Shows 38% longer battery life (35:28 vs 25:40 hours)
  • Delivers 48% higher peak brightness (916 against 617 nits)
  • Compatible with the latest Wi-Fi 6 wireless networks
  • Newer Bluetooth version (v5.1)
  • Optical image stabilization
  • 35% better performance in AnTuTu Benchmark (682K versus 506K)
  • Uses a faster type of memory: LPDDR5
  • The phone is 2-years and 11-months newer
  • Stereo speakers
  • More recent OS version: Android 12 versus 11

Review

Display
Screen quality, color accuracy, brightness
Performance
CPU/GPU performance in apps and games
Battery
Battery life, charging type and speed
Camera
Photo and video recording quality
Connectivity
Networks, ports, data transmission
NanoReview score
Final comparison evaluation

Value for money

You can enter your local price of these phones (in USD or any other currency) and click on the "Calculate" button to see which one has a better value for money.
Price

Tests and specifications

Comparison table of technical specifications and tests
Phone:
vs

Display

Type AMOLED AMOLED
Size 6.39 inches 6.28 inches
Resolution 1080 x 2340 pixels 1080 x 2400 pixels
Aspect ratio 19.5:9 20:9
PPI 403 ppi 419 ppi
Refresh rate 60 Hz 120 Hz
Max rated brightness 600 nits 500 nits
Max rated brightness in HDR - 1100 nits
HDR support Yes, HDR10 Yes, HDR10+
Screen protection Corning Gorilla Glass 6 Gorilla Glass Victus
Screen-to-body ratio 85.2% 89.2%
Display features - Always-On Display
- DC Dimming
- DCI-P3
- Always-On Display
- DC Dimming
Display tests
RGB color space 95.4% 98.6%
PWM 245 Hz 523 Hz
Response time 4.2 ms 1 ms
Contrast ∞ Infinity ∞ Infinity
Peak brightness test (auto)
617 nits
Xiaomi 12X +48%
916 nits
Sources: NotebookCheck [3], [4]

Design and build

Height 157.5 mm (6.2 inches) 152.7 mm (6.01 inches)
Width 74.6 mm (2.94 inches) 69.9 mm (2.75 inches)
Thickness 7.6 mm (0.3 inches) 8.16 mm (0.32 inches)
Weight 173 gramm (6.1 oz) 176 gramm (6.21 oz)
Waterproof No No
Rear material Glass Glass
Frame material Metal Metal
Colors Black, Blue, Purple Black, Blue, Pink
Fingerprint scanner Yes, in-display Yes, in-display
Screen-to-body ratio
85.2%
89.2%

Performance

Tests of Xiaomi Mi 9 and Xiaomi 12X in the benchmarks
SoC
Chipset Qualcomm Snapdragon 855 Qualcomm Snapdragon 870
Max. clock 2840 MHz 3200 MHz
CPU cores 8 (1 + 3 + 4) 8 (1 + 3 + 4)
Architecture - 4 cores at 1.8 GHz: Cortex-A55 (Kryo 485 Silver)
- 3 cores at 2.42 GHz: Cortex-A76 (Kryo 485 Gold)
- 1 core at 2.84 GHz: Cortex-A76 (Kryo 485 Gold)
- 4 cores at 1.8 GHz: Kryo 585 Silver (Cortex-A55)
- 3 cores at 2.42 GHz: Kryo 585 Gold (Cortex-A77)
- 1 core at 3.2 GHz: Kryo 585 Prime (Cortex-A77)
L3 cache 2 MB 4 MB
Lithography process 7 nanometers 7 nanometers
Graphics Adreno 640 Adreno 650
GPU clock 585 MHz 675 MHz
FLOPS ~899 GFLOPS ~1372 GFLOPS
Memory
RAM size 6 GB 8, 12 GB
Memory type LPDDR4X LPDDR5
Memory clock 2133 MHz -
Channels 2 2
Storage
Storage size 128 GB 128, 256 GB
Storage type UFS 2.1 UFS 3.1
Memory card No No

Benchmarks

Geekbench 5 (Single-Core)
615
Xiaomi 12X +53%
941
Geekbench 5 (Multi-Core)
2370
Xiaomi 12X +34%
3167
AnTuTu Benchmark 9
506829
Xiaomi 12X +35%
682264
CPU 145198 185270
GPU 179503 242268
Memory 76010 108952
UX 109413 148511
Total score 506829 682264
3DMark Wild Life Performance
3071
Xiaomi 12X +38%
4243
Stability 92% 99%
Graphics test 18 FPS 25 FPS
Graphics score 3071 4243
PCMark 3.0 score 10519 -
Sources: 3DMark [3], [4]

Software

Operating system Android 9.0 (Can be upgraded to Android 11) Android 11 (Can be upgraded to Android 12)
ROM MIUI 12.0.1 MIUI 13
OS size 13.5 GB 29.3 GB

Battery

Specifications
Capacity 3300 mAh 4500 mAh
Charge power 27 W 67 W
Battery type Li-Po Li-Po
Replaceable No No
Wireless charging Yes (20 W) No
Reverse charging No No
Fast charging Yes, Quick Charge 4 (50% in 30 min) Yes (78% in 30 min)
Full charging time 1:30 hr 0:48 hr
Battery life tests
Web browsing 07:01 hr 13:05 hr
Watching video 14:57 hr 16:44 hr
Gaming 03:32 hr 05:31 hr
Standby 84 hr 104 hr
General battery life
25:40 hr
Xiaomi 12X +38%
35:28 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 50 megapixels
Image resolution 8000 x 6000 8700 x 5800
Zoom Optical, 2x Digital
Flash Dual LED Dual LED
Stabilization Digital Optical
8K video recording No Up to 24FPS
4K video recording Up to 60FPS Up to 60FPS
1080p video recording Up to 60FPS Up to 60FPS
Slow motion 960 FPS (1080p) 960 FPS (720p)
Angle of widest lens 117° 123°
Lenses 3 (48 MP + 12 MP + 16 MP) 3 (50 MP + 13 MP + 5 MP)
Wide (main) lens - 48 MP
- Aperture: f/1.8
- Focal length: 27 mm
- Pixel size: 0.8 micron
- Sensor: 1/2", Sony IMX586 (Exmor-RS CMOS)
- Laser autofocus
- 50 MP
- Aperture: f/1.9
- Focal length: 26 mm
- Pixel size: 1 micron
- Sensor: 1/1.56", Sony IMX766 (Exmor-RS CMOS)
- Phase autofocus (Dual Pixel)
- Optical stabilization
Telephoto lens - 12 MP
- Aperture: f/2.2
- Focal length: 54 mm
- Pixel size: 1 micron
- Sensor: 1/3.6", Samsung S5K3M5 (ISOCELL CMOS)
- Phase autofocus
-
Ultra-wide lens - 16 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1 micron
- Sensor: 1/3.0", Sony IMX481 (BSI CMOS)
- Phase autofocus
- 13 MP
- Aperture: f/2.4
- Pixel size: 1.12 micron
- Sensor: 1/3.06", OmniVision OV13B10 (CMOS)
Macro lens - - 5 MP
- Aperture: f/2.4
- Focal length: 50 mm
- Pixel size: 1.12 micron
- Phase autofocus
- Optical stabilization
Camera features - Bokeh mode
- Pro mode
- RAW support
- Bokeh mode
- Pro mode
Samples Photo samples of Xiaomi Mi 9 from DxOMark -
Selfie camera
Megapixels 20 megapixels 32 megapixels
Image resolution 5184 x 3880 6528 x 4896
Aperture f/2.0 f/2.4
Focal length 18 mm 26 mm
Pixel size 0.9 microns 0.7 microns
Sensor type CMOS CMOS
Sensor size 1/3" 1/3"
Video resolution 1080p (Full HD) at 30 FPS 1080p (Full HD) at 60 FPS

DxOMark camera tests

Photo quality
112
Video quality
99
Generic camera score
107

Connectivity

Wi-Fi standard Wi-Fi 5 (802.11 a/b/g/n/ac) Wi-Fi 6 (802.11 a/b/g/n/ac/ax)
Wi-Fi features - Dual Band
- 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 5.1
Bluetooth features LE, A2DP LE
USB type USB Type-C USB Type-C
USB version 2 2
USB features - Charging
- USB-Storage mode
- USB-Host mode
- OTG
- Charging
- USB-Storage mode
- OTG
GPS GPS, GLONASS, Beidou, Galileo GPS, GLONASS, Beidou, Galileo, NAVIC
NFC* Yes Depends on the region
Infrared port Yes Yes
Network
Number of SIM* 2 2
Type of SIM card Nano Nano
Multi SIM mode Standby Standby
eSIM support* No -
Hybrid slot No No
LTE Cat* 20 -
5G support No Yes

Sound

Speakers Mono Stereo
Headphone audio jack No No
FM radio No No
Dolby Atmos No Yes
Speakers test
Max. loudness
87.1 dB
90.1 dB

Other

Category Flagship Flagship
Announced February 2019 December 2021
Release date April 2019 December 2021
SAR (head) 1.389 W/kg -
SAR (body) 0.99 W/kg -
Sensors - Hall-effect sensor
- Barometer
- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
*Disclaimer! NFC, GSM network support, and some other specs can be different depending on the country.

Conclusion

After analyzing all the data, we think that the Xiaomi 12X is definitely a better buy.

Cast your vote

So, which phone would you choose?
6 (21.4%)
22 (78.6%)
Total votes: 28

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