Xiaomi Redmi K40S

Screen: 6.67" AMOLED - 1080 x 2400
SoC: Qualcomm Snapdragon 870
Camera: 3 (48 MP + 8 MP + 2 MP)
Battery: 4500 mAh
OS: Android 12
Weight: 195 grams (6.88 oz)

Review

Display

83

Camera

72

Performance

67

Gaming

57

Battery

81 *

Connectivity

79

NanoReview Score

74 *

Scores marked with a red asterisk ( * ) are approximate, as we currently do not have sufficient test results to make a precise estimation.

Display

Type	AMOLED
Size	6.67 inches
Resolution	1080 x 2400 pixels
Aspect ratio	20:9
PPI	395 ppi
Refresh rate	120 Hz
Adaptive refresh rate	No
Max rated brightness	500 nits
Max rated brightness in HDR	1300 nits
HDR support	Yes, HDR10+
Screen protection	Corning Gorilla Glass 5
Screen-to-body ratio	86.6%
Display features	- DCI-P3 - Always-On Display - DC Dimming

Design and build

Height	163.2 mm (6.43 inches)
Width	75.95 mm (2.99 inches)
Thickness	7.7 mm (0.3 inches)
Weight	195 g (6.88 oz)
Waterproof	IP53
Advanced cooling	Vapor chamber
Rear material	Glass
Frame material	Plastic
Colors	Black, Gray, Blue, Green
Fingerprint scanner	Yes, in-button

Screen-to-body ratio

86.6%

Performance

All specs and test Xiaomi Redmi K40S in the benchmarks

SoC
Chipset	Qualcomm Snapdragon 870
Max clock	3200 MHz
CPU cores	8 (1 + 3 + 4)
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)
L3 cache	4 MB
Lithography process	7 nanometers
Graphics	Adreno 650
GPU shading units	1024
GPU clock	670 MHz
FLOPS	~1372.1 GFLOPS

Benchmarks

Geekbench 6 (Single-Core)

1374

Geekbench 6 (Multi-Core)

3714

AnTuTu Benchmark 10

783884

CPU	225546
GPU	234388
Memory	149138
UX	175830
Total score	783884

3DMark Wild Life Performance

4313

Stability	99%
Graphics test	25 FPS
Graphics score	4313

PCMark 3.0

11498

Web score	9430
Video editing	7238
Photo editing	27520
Data manipulation	9091
Writing score	13354

Memory

RAM
RAM size	6, 8, 12 GB
Memory type	LPDDR5
Memory clock	2750 MHz
Channels	4

Storage
Storage size	128, 256 GB
Storage type	UFS 3.1
Memory card	No

Software

Operating system	Android 12
ROM	MIUI 13

Battery

Capacity	4500 mAh
Max charge power	67 W
Battery type	Li-Po
Replaceable	No
Wireless charging	No
Reverse charging	No
Fast charging	Yes (50% in 14 min)
Full charging time	0:39 hr

Camera

Specs and camera test of the Redmi K40S

Main camera
Matrix	48 megapixels
Image resolution	8000 x 6000
Zoom	Digital
Flash	Dual LED
Stabilization	Optical
8K video recording	No
4K video recording	Up to 30FPS
1080p video recording	Up to 60FPS
Slow motion	960 FPS (720p)
Angle of widest lens	119°
Lenses	3 (48 MP + 8 MP + 2 MP)
Wide (main) lens	- 48 MP - Aperture: f/1.8 - Pixel size: 0.8 micron - Sensor: 1/2.0", Sony IMX582 (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)
Macro lens	- 2 MP - Aperture: f/2.4 - Focal length: 50 mm - Pixel size: 1.12 micron - Sensor: 1/5.0" (CMOS)
Camera features	- Bokeh mode - Pro mode

Selfie camera
Megapixels	20 megapixels
Image resolution	4608 x 3456
Aperture	f/2.5
Pixel size	0.8 microns
Sensor type	Exmor-RS CMOS
Sensor size	1/2"
Video resolution	1080p (Full HD) at 30 FPS

Connectivity

Wi-Fi standard	Wi-Fi 6 (802.11 a/b/g/n/ac/ax)
Wi-Fi features	- Dual Band - Wi-Fi MiMO - Wi-Fi Direct - Wi-Fi Hotspot - Wi-Fi Display
Bluetooth version	5.2
Bluetooth features	LE, HID, A2DP
USB type	USB Type-C
USB version	2
USB features	- Charging - USB-Storage mode - OTG
GPS	GPS, GLONASS, Beidou, Galileo, QZSS, NAVIC
NFC *	Yes
Infrared port	Yes

Network
Number of SIM *	2
Type of SIM card	Nano
Multi SIM mode	Standby
eSIM support *	No
Hybrid slot	No
LTE Cat *	20
2G network	GSM 850 / 900 / 1800 / 1900MHz
3G network	WCDMA B1 / B2 / B4 / B5 / B6 / B8 / B19
4G network	LTE B1 / B2 / B3 / B4 / B5 / B8 / B18 / B19 / B26 / B34 / B38 / B39 / B40 / B41 / B42
5G support	Yes