Home > Smartphone comparison > Redmi K40 vs Mi 10i – which one to choose?

Xiaomi Redmi K40 vs Mi 10i

Here we compared two smartphones: the 6.67-inch Xiaomi Redmi K40 (with Qualcomm Snapdragon 870 5G) that was released on February 25, 2021, against the Xiaomi Mi 10i, which is powered by Qualcomm Snapdragon 750G and came out 2 months before. 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 Redmi K40
  • Water-resistant body (IP53 classification)
  • Delivers 190% higher maximum brightness (1298 against 447 nits)
  • 83% better performance in AnTuTu Benchmark (702K versus 383K)
  • Compatible with the latest Wi-Fi 6 wireless networks
  • Newer Bluetooth version (v5.1)
  • Uses a faster type of memory: LPDDR5 2750 MHz
  • More recent OS version: Android 11 versus 10
  • Super AMOLED display (versus competitor's IPS LCD)
Reasons to consider the Xiaomi Mi 10i
  • Expandable storage via MicroSD card up to 512GB
  • Comes with 300 mAh larger battery capacity: 4820 vs 4520 mAh
  • Includes a 3.5 mm headphone audio jack port

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 Super AMOLED IPS LCD
Size 6.67 inches 6.67 inches
Resolution 1080 x 2400 pixels 1080 x 2400 pixels
Aspect ratio 20:9 20:9
PPI 395 ppi 395 ppi
Refresh rate 120 Hz 120 Hz
HDR support Yes, HDR10+ Yes, HDR10
Screen protection Corning Gorilla Glass 5 Corning Gorilla Glass 5
Screen-to-body ratio 85.9% 84.6%
Display features - DCI-P3
- Always-On Display
- DC Dimming
-
Max. Brightness
Redmi K40 +190%
1298 nits
447 nits

Design and build

Height 163.7 mm (6.44 inches) 165.4 mm (6.51 inches)
Width 76.4 mm (3.01 inches) 76.8 mm (3.02 inches)
Thickness 7.8 mm (0.31 inches) 9 mm (0.35 inches)
Weight 196 gramm (6.91 oz) 214.5 gramm (7.57 oz)
Waterproof IP53 No
Rear material Glass Glass
Frame material Plastic Plastic
Colors White, Black Black, Blue, Green
Fingerprint scanner Yes, in home button Yes, in home button
Screen-to-body ratio
Redmi K40 +2%
85.9%
84.6%

Performance

Tests of Xiaomi Redmi K40 and Xiaomi Mi 10i in the benchmarks
SoC
Chipset Qualcomm Snapdragon 870 5G Qualcomm Snapdragon 750G
Max. clock 3200 MHz 2200 MHz
CPU cores 8 (1 + 3 + 4) 8 (2 + 6)
Architecture - 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)
- 6 cores at 1.8 GHz: Kryo 570 Silver (Cortex-A55)
- 2 cores at 2.2 GHz: Kryo 570 Gold (Cortex-A77)
L3 cache 4 MB -
Lithography process 7 nanometers 8 nanometers
Graphics Adreno 650 Adreno 619
GPU clock 675 MHz 825 MHz
FLOPS ~1372 GFLOPS -
Memory
RAM size 6, 8 GB 6, 8 GB
Memory type LPDDR5 LPDDR4X
Memory clock 2750 MHz 2133 MHz
Channels 2 2
Storage
Storage size 128, 256 GB 64, 128 GB
Storage type UFS 3.1 UFS 2.2
Memory card No MicroSD
Memory card max. size - Up to 512 GB

Benchmarks

Geekbench 5 (Single-Core)
Redmi K40 +67%
1013
608
Geekbench 5 (Multi-Core)
Redmi K40 +97%
3487
1769
AnTuTu Benchmark 9
Redmi K40 +83%
702233
383909

Software

Operating system Android 11 Android 10
ROM MIUI 12 MIUI 12

Battery

Specifications
Capacity 4520 mAh 4820 mAh
Charge power 33 W 33 W
Battery type Li-Ion Li-Po
Replaceable No No
Wireless charging No No
Reverse charging No No
Fast charging Yes (70% in 30 min) Yes (50% in 25 min)
Full charging time 0:52 hr 0:58 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 108 megapixels
Image resolution 8000 x 6000 12032 x 9024
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K video recording No No
4K video recording Up to 30FPS Up to 30FPS
1080p video recording Up to 60FPS Up to 60FPS
Slow motion 960 FPS (1080p) 960 FPS (720p)
Angle of widest lens 119° 120°
Lenses 3 (48 MP + 8 MP + 5 MP) 4 (108 MP + 8 MP + 2 MP + 2 MP)
Wide (main) lens - 48 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2.0" (CMOS)
- Phase autofocus
- 108 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/1.52", ISOCELL HM2 (ISOCELL Plus CMOS)
- Phase autofocus
Ultra-wide lens - 8 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
- 8 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
Macro lens - 5 MP
- Focal length: 50 mm
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
- 2 MP
- Aperture: f/2.4
Depth lens - - 2 MP
- Aperture: f/2.4
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
- Pro mode
Selfie camera
Megapixels 20 megapixels 16 megapixels
Image resolution 4608 x 3456 4608 x 3456
Aperture - f/2.5
Focal length 26 mm -
Pixel size 0.8 microns 1 microns
Sensor type CMOS CMOS
Sensor size 1/3.4" 1/3.06"
Video resolution 1080p (Full HD) at 30 FPS 1080p (Full HD) at 30 FPS

Connectivity

Wi-Fi standard Wi-Fi 6 (802.11 a/b/g/n/ac/ax) Wi-Fi 5 (802.11 b/g/n/ac)
Wi-Fi features - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
- Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5.1 5
Bluetooth features LE, HID, A2DP LE, HID, A2DP
USB type USB Type-C USB Type-C
USB version 2 2
USB features - Charging
- USB-Storage mode
- OTG
- Charging
- USB-Storage mode
- OTG
GPS GPS, GLONASS, Beidou, Galileo, NAVIC GPS, GLONASS, Beidou, Galileo, NAVIC
NFC* Yes Yes
Infrared port Yes Yes
Network
Number of SIM* 2 2
Type of SIM card Nano Nano
Multi SIM mode Standby Standby
eSIM support* No No
Hybrid slot No Yes
LTE Cat* 24 18
5G support Yes Yes

Sound

Speakers Stereo Stereo
Headphone audio jack No Yes
FM radio No Yes
Dolby Atmos Yes No

Other

Category Flagship Budget
Announced February 2021 January 2021
Release date March 2021 January 2021
Launch price ~ 288 USD ~ 325 USD
SAR (head) - 0.88 W/kg
Sensors - 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 Redmi K40 is definitely a better buy.

Cast your vote

So, which phone would you choose?
7 (100%)
0 (0%)
Total votes: 7

User opinions

You can share your opinion or ask a question in the comments below