Home > Smartphone comparison > Redmi K40 vs Poco X3 NFC – which one to choose?

Xiaomi Redmi K40 vs Poco X3 NFC

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 Poco X3 NFC, which is powered by Qualcomm Snapdragon 732G and came out 6 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
  • 2.1x better performance in AnTuTu Benchmark (702K versus 342K)
  • Delivers 108% higher maximum brightness (1298 against 625 nits)
  • Compatible with the latest Wi-Fi 6 wireless networks
  • Uses a faster type of memory: LPDDR5 2750 MHz
  • Super AMOLED display (versus competitor's IPS LCD)
  • Faster storage type - UFS 3.1 versus UFS 2.1
  • 81% faster in single-core GeekBench 5 test: 1013 and 559 points
  • The phone is 6-months newer
  • Weighs 19 grams less
Reasons to consider the Xiaomi Poco X3 NFC
  • Expandable storage via MicroSD card up to 256GB
  • Comes with 640 mAh larger battery capacity: 5160 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

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
-
Display tests
RGB color space - 99.7%
PWM - 2358 Hz
Response time - 35.4 ms
Max. Brightness
Redmi K40 +108%
1298 nits
625 nits
Sources: NotebookCheck [1]

Design and build

Height 163.7 mm (6.44 inches) 165.3 mm (6.51 inches)
Width 76.4 mm (3.01 inches) 76.8 mm (3.02 inches)
Thickness 7.8 mm (0.31 inches) 9.4 mm (0.37 inches)
Weight 196 gramm (6.91 oz) 215 gramm (7.58 oz)
Waterproof IP53 IP53
Rear material Glass Plastic
Frame material Plastic Metal
Colors White, Black Gray, Blue
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 Poco X3 NFC in the benchmarks
SoC
Chipset Qualcomm Snapdragon 870 5G Qualcomm Snapdragon 732G
Max. clock 3200 MHz 2300 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 2.3 GHz: Kryo 470 Gold (Cortex-A76)
L3 cache 4 MB 1 MB
Lithography process 7 nanometers 8 nanometers
Graphics Adreno 650 Adreno 618
GPU clock 675 MHz 810 MHz
FLOPS ~1372 GFLOPS ~435 GFLOPS
Memory
RAM size 6, 8 GB 6 GB
Memory type LPDDR5 LPDDR4X
Memory clock 2750 MHz 1866 MHz
Channels 2 2
Storage
Storage size 128, 256 GB 64, 128 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 +81%
1013
Geekbench 5 (Multi-Core)
Redmi K40 +99%
3487
AnTuTu Benchmark 9
Redmi K40 +105%
702233
342216

Software

Operating system Android 11 Android 10 (Can be upgraded to Android 11)
ROM MIUI 12 MIUI 12
OS size - 20.5 GB

Battery

Specifications
Capacity 4520 mAh 5160 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 (55% in 30 min)
Full charging time 0:52 hr 1:15 hr

Battery life tests

Web browsing (Wi-Fi)
n/a
17:06 hr
Watching videos (Player)
n/a
14:09 hr
Talk (3G)
n/a
31:50 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 64 megapixels
Image resolution 8000 x 6000 9248 x 6920
Zoom Digital Digital
Flash LED Dual 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° 119°
Lenses 3 (48 MP + 8 MP + 5 MP) 4 (64 MP + 13 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
- Pixel size: 0.8 micron
- Sensor: 1/1.73", Sony IMX682 (Exmor-RS CMOS)
- Phase autofocus
Ultra-wide lens - 8 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
- 13 MP
- Aperture: f/2.2
- Pixel size: 1 micron
Macro lens - 5 MP
- Focal length: 50 mm
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
- 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
Depth lens - - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
- Pro mode
Samples - Photo samples of Xiaomi Poco X3 NFC from DxOMark
Selfie camera
Megapixels 20 megapixels 20 megapixels
Image resolution 4608 x 3456 5963 x 3354
Aperture - f/2.2
Focal length 26 mm -
Pixel size 0.8 microns 0.8 microns
Sensor type CMOS CMOS
Sensor size 1/3.4" 1/3.4"
Video resolution 1080p (Full HD) at 30 FPS 1080p (Full HD) at 30 FPS

DxOMark camera tests

Photo quality
Video quality
Generic camera score

Connectivity

Wi-Fi standard Wi-Fi 6 (802.11 a/b/g/n/ac/ax) Wi-Fi 5 (802.11 a/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 5.1
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
- USB-Host mode
- OTG
GPS GPS, GLONASS, Beidou, Galileo, NAVIC GPS, GLONASS, Beidou, Galileo, QZSS, SBAS
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 15
5G support Yes No

Sound

Speakers Stereo Stereo
Headphone audio jack No Yes
FM radio No Yes
Dolby Atmos Yes Yes
Speakers test
Max. loudness
n/a
89.2 dB

Other

Category Flagship Mid-range
Announced February 2021 September 2020
Release date March 2021 September 2020
Launch price ~ 288 USD ~ 250 USD
SAR (head) - 0.558 W/kg
SAR (body) - 0.986 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?
16 (51.6%)
15 (48.4%)
Total votes: 31

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