Xiaomi Redmi K40 vs Redmi K30

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 Redmi K30, which is powered by Qualcomm Snapdragon 730G and came out 14 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)
  • 2.2x better performance in AnTuTu Benchmark (720K versus 335K)
  • Delivers 83% higher maximum brightness (1313 against 717 nits)
  • Newer Bluetooth version (v5.1)
  • Uses a faster type of memory: LPDDR5 2750 MHz
  • Stereo speakers
  • More recent OS version: Android 11 versus 10
  • Super AMOLED display (versus competitor's IPS LCD)
  • The phone is 1-year and 2-months newer
Reasons to consider the Xiaomi Redmi K30
  • Optical image stabilization
  • Expandable storage via MicroSD card up to 256GB
  • 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% 84.8%
Display features - DCI-P3
- Always-On Display
- DC Dimming
- Always-On Display
- DC Dimming
Max. Brightness
Redmi K40 +83%
1313 nits
717 nits

Design and build

Height 163.7 mm (6.44 inches) 165.3 mm (6.51 inches)
Width 76.4 mm (3.01 inches) 76.6 mm (3.02 inches)
Thickness 7.8 mm (0.31 inches) 8.8 mm (0.35 inches)
Weight 196 gramm (6.91 oz) 208 gramm (7.34 oz)
Waterproof IP53 No
Rear material Glass Glass
Frame material Plastic Plastic
Colors White, Black White, Blue, Red, Purple
Fingerprint scanner Yes, in home button Yes, in home button
Screen-to-body ratio
Redmi K40 +1%
85.9%
84.8%

Performance

Tests of Xiaomi Redmi K40 and Xiaomi Redmi K30 in the benchmarks
SoC
Chipset Qualcomm Snapdragon 870 5G Qualcomm Snapdragon 730G
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 470 Silver (Cortex-A55)
- 2 cores at 2.2 GHz: Kryo 470 Gold (Cortex-A76)
L3 cache 4 MB -
Lithography process 7 nanometers 8 nanometers
Graphics Adreno 650 Adreno 618
GPU clock 675 MHz 825 MHz
FLOPS ~1372 GFLOPS ~422 GFLOPS
Memory
RAM size 6, 8, 12 GB 6, 8 GB
Memory type LPDDR5 LPDDR4X
Memory clock 2750 MHz 1866 MHz
Channels 4 2
Storage
Storage size 128, 256 GB 64, 128, 256 GB
Storage type UFS 3.1 UFS 2.1
Memory card No MicroSD
Memory card max. size - Up to 256 GB

Benchmarks

Geekbench 5 (Single-Core)
Redmi K40 +87%
1028
550
Geekbench 5 (Multi-Core)
Redmi K40 +105%
3503
1711
AnTuTu Benchmark 9
Redmi K40 +115%
720401
335009
CPU - 100012
GPU - 88659
Memory - 53417
UX - 91789
Total score 720401 335009
3DMark Wild Life Performance
4262
n/a
Stability 90% -
Graphics test 25 FPS -
Graphics score 4262 -
PCMark 3.0 score 12182 -
Sources: 3DMark [3]

Software

Operating system Android 11 Android 10
ROM MIUI 12.5 Enhanced MIUI 12

Battery

Specifications
Capacity 4520 mAh 4500 mAh
Charge power 33 W 27 W
Battery type Li-Po Li-Po
Replaceable No No
Wireless charging No No
Reverse charging No No
Fast charging Yes (70% in 30 min) Yes (100% in 70 min)
Full charging time 0:52 hr 1:10 hr
Battery life tests
Web browsing - 11:08 hr
Watching video - 09:48 hr
Gaming - 05:39 hr
Standby - 148 hr
General battery life
n/a
33:46 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 64 megapixels
Image resolution 8000 x 6000 9000 x 7000
Zoom Digital Digital
Flash LED Dual LED
Stabilization Digital Optical
8K video recording No No
4K video recording Up to 30FPS Up to 30FPS
1080p video recording Up to 60FPS Up to 120FPS
Slow motion 960 FPS (720p) 960 FPS (720p)
Angle of widest lens 119° 120°
Lenses 3 (48 MP + 8 MP + 5 MP) 4 (64 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
- 64 MP
- Aperture: f/1.9
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/1.7", Sony IMX686 (Exmor-RS CMOS)
- Phase autofocus
- Optical stabilization
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", OmniVision OV8856 (CMOS)
Macro lens - 5 MP
- Aperture: f/2.4
- Focal length: 50 mm
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
- 2 MP
- Aperture: f/2.4
- Focal length: 1.94 mm
- Pixel size: 1.75 micron
- Sensor: 1/5", GalaxyCore GC02M1 (CMOS)
Depth lens - - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5", GalaxyCore GC02M1 (CMOS)
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
- Pro mode
Selfie camera
Megapixels 20 megapixels 20 megapixels
Image resolution 4608 x 3456 5963 x 3354
Aperture f/2.5 f/2.2
Focal length 26 mm 27 mm
Pixel size 0.8 microns 0.8 microns
Sensor type CMOS ISOCELL CMOS
Sensor size 1/3.4" 1/3.4"
Video resolution 1080p (Full HD) at 30 FPS 1080p (Full HD) at 30 FPS

Connectivity

Wi-Fi standard Wi-Fi 6E (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, 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
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* 20 15
5G support Yes Yes

Sound

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

Other

Category Flagship Mid-range
Announced February 2021 December 2019
Release date March 2021 February 2020
SAR (head) - 0.47 W/kg
SAR (body) - 1.16 W/kg
Sensors - Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
- Barometer
- 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?
19 (82.6%)
4 (17.4%)
Total votes: 23

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