Asus Zenfone 8 vs Xiaomi Redmi K40: Comparison

Comparison of features, performance, design, battery, camera and connectivity between the following smartphones: Asus Zenfone 8 vs Xiaomi Redmi K40. The complete information of specifications to decide which to buy.

Compare
Asus Zenfone 8Asus Zenfone 8Global · 8GB · 128GB · VA
Xiaomi Redmi K40Xiaomi Redmi K40China · 6GB · 128GB
Technical data sheets

Basics
Asus Zenfone 8
Asus Zenfone 8
Global · 8GB · 128GB · VA
View datasheet
vs
Xiaomi Redmi K40
Xiaomi Redmi K40
China · 6GB · 128GB
View datasheet
vs

Score
Ki Cost-effective
Score		 -- Not available -- Not available
Design and Screen score --Design & Materials --Design & Materials
Performance and Hardware score --Performance & Hardware --Performance & Hardware
Camera score --Camera --Camera
Connectivity score -- Connectivity -- Connectivity
Battery score --Battery --Battery

User reviews
User score
9.2
7 reviews
9.6
5 reviews

Technical specifications of the Asus Zenfone 8 vs Xiaomi Redmi K40

Specs Asus Zenfone 8 price compare Asus Zenfone 8
Global · 8GB · 128GB · VA 		Xiaomi Redmi K40 prices Xiaomi Redmi K40
China · 6GB · 128GB
Inches 5.9" 6.67"
Resolution FHD+ FHD+
Usable surface 82% useful 85% useful
Aspect Ratio 20:9 20:9
Dimensions 68.5 mm
148.0 mm
8.9 mm 		76.4 mm
163.7 mm
7.8 mm
Weight 169 g 196 g
Micro SnapD. 888
Octa-Core 		SnapD. 870
Octa-Core
RAM 8 GB RAM 6 GB RAM
Storage 128 GB 128 GB
AnTuTu 891.700
v10 		802.870
v10
Battery 4000 mAh 4520 mAh
Main Camera 1
64 Mpx · ƒ/1.8
IMX686 Exmor RS
2 		1
48 Mpx · ƒ/1.79
IMX582 Exmor RS
2 3
Selfie Camera SELF 12 Mpx · ƒ/2.45 SELF 20 Mpx · Unknow
Bands
OS Android 13 Tiramisu Android 14 Upside-down cake

Brand
Brand Asus Xiaomi
Aliases ZS590KS M2012K11AC, HAYDN, M2012K11G

Release Date
Release date May 2021,
5 years ago 		February 2021,
5 years ago
State Not available Not available
Market Global China

Design & Materials

Structure

Asus Zenfone 8
Xiaomi Redmi K40
Asus Zenfone 8
Xiaomi Redmi K40
Size
68.5 mm • 148.0 mm • 8.9 mm
See more details
 Print 3D Model
76.4 mm • 163.7 mm • 7.8 mm
See more details
 Print 3D Model
Weight 169 g 196 g
Usable surface 82 % 85 %
Materials Aluminium alloy Plastic, Glass, Splash resistant design
Resistance IP68 -
Colors
Silver
Gray
Black
White
Blue

Screen
Diagonal 5.9" 6.67"
Type Oled AMOLED • Samsung E4
Aspect Ratio 20:9 20:9
Resolution FHD+
1080 x 2400 px 		FHD+
1080 x 2400 px
Brightness 1100 nits --
Peak brightness -- 1300 nits
Maximum brightness (HBM) -- 900 nits
Density 445 Pixels per inch 386 Pixels per inch

Others

Others
  • Hole-punch Notch
  • Refresh rate 120 Hz
  • Peak brightness - 1100 cd/m²
  • HDR10
  • HDR10+
  • DCI-P3
  • Full sRGB standard
  • 105% NTSC
  • Color LED Notifications
  • Scratch resistant
  • Corning Gorilla Glass Victus
  • Capacitive
  • Multi-touch
  • Frameless
  • Hole-punch Notch
  • Refresh rate 120 Hz
  • Touch sampling rate 360 Hz
  • 5000000:1 contrast ratio
  • HDR10+
  • DCI-P3
  • True Tone display
  • MEMC
  • Scratch resistant
  • 2.5D curved glass screen
  • Corning Gorilla Glass 5
  • Capacitive
  • Multi-touch
  • Frameless

User reviews

Is it a drop-resistant and scratch-resistant smartphone?
9.0
8.8
Do you think it's a nice phone?
9.4
9.8
Is it comfortable?
10
9.2
Can you see it well in the sunlight?
8.3
9.2
Number of reviews
7 reviews
5 reviews

Performance & Hardware

Processor
Model Qualcomm Snapdragon 888 Qualcomm Snapdragon 870 (SM8250-AC)
CPU 1x Cortex X1 2.84GHz + 3x Cortex A78 2.42GHz + 4x Cortex A55 1.8GHz 1x Cortex-A77 3.20 GHz + 3x Cortex-A77 2.4 GHz + 4x Cortex-A55 1.8 GHz
Type Octa-Core Octa-Core
Manufacturing 5 nm 7 nm
64 Bits Yes Yes

Graphics
GPU Adreno 660 Qualcomm Adreno 650

RAM
RAM 8 GB 6 GB
Type RAM LPDDR5 RAM LPDDR5

Antutu
Score
891.700
Antutu v10
Overall performance better than 5% of devices
See more details
802.870
Antutu v10
Overall performance better than 6% of devices
See more details

Storage
Capacity 128 GB 128 GB
Type UFS Storage 3.1 UFS Storage 3.1
SD Slot No No

Security
Fingerprint Yes, in screen Yes, on the side

Sensors
Sensors
  • Fingerprint
  • Proximity
  • Light sensor
  • Accelerometer
  • Compass
  • Gyroscope
  • Gravity
  • Hall
  • Fingerprint
  • Light sensor
  • Accelerometer
  • Compass
  • Gyroscope
  • Ultrasonic proximity virtual

Audio

Audio
  • Hi-Res Audio
  • Noise cancellation microphone
  • Stereo Speakers
  • 3 microphones
  • Dolby Atmos
  • Hi-Res Audio
  • Stereo Speakers

Others
Notifications LED Color LED Notifications --
Cooling system No Yes
Gaming buttons No No

User reviews

Does it have good sound?
10
9.8
Does it work smoothly in everyday use?
8.6
9.8
What's your experience been with demanding games?
9.0
9.6
Number of reviews
7 reviews
5 reviews

Camera

Main
No. of cameras Double rear camera Triple rear camera
1
Camera type

Standard

Standard
Resolution 64 Mpx 48 Mpx
Aperture ƒ/ 1.8 ƒ/ 1.79
Optical zoom -- --
View angle -- --
Sensor Sony IMX686 Exmor RS Sony IMX582 Exmor RS
Type CMOS CMOS
ISO -- --
Pixel size 0.80 µm 0.60 µm
Pixel Binning 1-4 (2x2) 1-4 (2x2)
Sensor size 1/1.7" 1/2.96"
2
Camera type

Wide Angle + Macro

Wide Angle + Macro
Resolution
12 Mpx
8 Mpx
Aperture
ƒ/ 2.2
ƒ/ 2.2
Optical zoom
--
--
View angle
--
--
Sensor
Sony IMX363 Exmor RS
Sony IMX355
Type
CMOS BSI
CMOS BSI
Pixel size
1.40 µm
1.14 µm
Pixel Binning
--
--
Sensor size
1/2.55"
1/2.8"
3
Camera type
--

Macro lens
Resolution
5 Mpx
Aperture
ƒ/ 2.4
Optical zoom
--
View angle
--
Sensor
Samsung S5K5E9
Type
ISOCELL
Pixel size
1.12 µm
Pixel Binning
--
Sensor size
1/5"

Features
Flash LED Dual LED
Optical Stabilisation Yes No
Slow Motion Video Yes,
480 fps 		Yes,
960 fps
Others
  • 4K Video
  • 8K Video
  • Digital zoom
  • Dual camera
  • Digital image stabilization
  • Optical Stabilization (OIS)
  • Autofocus
  • Touch focus
  • Continuous autofocus
  • Phase detection autofocus (PDAF)
  • Continuous shooting
  • Geotagging
  • Panorama
  • HDR
  • Face detection
  • White balance settings
  • ISO settings
  • Exposure compensation
  • Scene mode
  • Self-timer
  • RAW
  • 4K Video
  • Digital zoom
  • Triple camera
  • Digital image stabilization
  • Autofocus
  • Touch focus
  • Manual focus
  • Continuous shooting
  • Geotagging
  • Panorama
  • HDR
  • Face detection
  • White balance settings
  • ISO settings
  • Exposure compensation
  • Scene mode
  • Self-timer

Selfie
SELF
Camera type

Dedicated

Dedicated
Resolution 12 Mpx 20 Mpx
Aperture ƒ/ 2.45 Unknow
Optical zoom -- --
View angle -- --
Sensor Sony IMX663 Samsung S5K3T2
Type CMOS CMOS
Pixel size 1.22 µm 0.80 µm
Pixel Binning -- 1-4 (2x2)
Sensor size 1/2.93" 1/3.4"
Others
--
--

DxOMark Score
DxOMark Score
116
Camera
120Photo
118Video
 --

User reviews

Quality of daytime photos
9.0
8.4
Quality of nighttime photos
8.3
7.4
Quality of selfies
8.7
7.8
Does it have a powerful flash?
9.3
8.4
Number of reviews
7 reviews
5 reviews

Connectivity

Network compatibility

5G
  • n1 (2100)
  • n2 (1900 PCS)
  • n3 (1800)
  • n5 (850)
  • n7 (2600)
  • n8 (900)
  • n12 (700)
  • n20 (800)
  • n28b (700)
  • n28a (700)
  • n38 (2600)
  • n77 (3700)
  • n78 (3500)
  • n1 (2100)
  • n3 (1800)
  • n28a (700)
  • n41 (2500)
  • n78 (3500)
  • n79 (4700)
4G LTE
  • B1 (2100)
  • B2 (1900)
  • B3 (1800)
  • B4 (1700/2100 AWS 1)
  • B5 (850)
  • B7 (2600)
  • B8 (900)
  • B12 (700)
  • B17 (700)
  • B18 (800)
  • B19 (800)
  • B20 (800)
  • B26 (850)
  • B28b (700)
  • B28a (700)
  • B34 (TDD 2100)
  • B38 (TDD 2600)
  • B39 (TDD 1900)
  • B40 (TDD 2300)
  • B41 (TDD 2500)
  • B42 (TDD 3500)
  • B1 (2100)
  • B2 (1900)
  • B3 (1800)
  • B4 (1700/2100 AWS 1)
  • B5 (850)
  • B7 (2600)
  • B8 (900)
  • B18 (800)
  • B19 (800)
  • B26 (850)
  • B28a (700)
  • B34 (TDD 2100)
  • B38 (TDD 2600)
  • B39 (TDD 1900)
  • B40 (TDD 2300)
  • B41 (TDD 2500)
  • B42 (TDD 3500)
3G
  • B1 (2100)
  • B2 (1900)
  • B3 (1800)
  • B4 (1700/2100 AWS A-F)
  • B5 (850)
  • B6 (800)
  • B8 (900)
  • B19 (800)
  • B1 (2100)
  • B2 (1900)
  • B4 (1700/2100 AWS A-F)
  • B5 (850)
  • B6 (800)
  • B8 (900)
  • B19 (800)
2G
  • B2 (1900)
  • B3 (1800)
  • B5 (850)
  • B8 (900)
  • CDMA BC0 (800)
  • B2 (1900)
  • B3 (1800)
  • B5 (850)
  • B8 (900)

SIM card
Dual SIM Dual Sim Dual Standby Dual Sim Dual Standby
Type
  • Nano SIM
  • Nano SIM
  • Nano SIM
  • Nano SIM

Wi-Fi
Wi-Fi
  • 802.11a
  • 802.11b
  • 802.11g
  • 802.11n
  • 802.11n 5GHz
  • 802.11ac
  • WiFi 6 (802.11ax)
  • 802.11a
  • 802.11b
  • 802.11g
  • 802.11n
  • 802.11n 5GHz
  • 802.11ac
  • WiFi 6 (802.11ax)
Others
  • Dual band
  • Wi-Fi Hotspot
  • Wi-Fi Direct
  • Wi-Fi Display
  • Wi-Fi MiMO
  • Dual band
  • Wi-Fi Hotspot
  • Wi-Fi Direct
  • Wi-Fi Display
  • Wi-Fi MiMO

Bluetooth
Version Bluetooth 5.2 LE Low energy consumption Bluetooth 5.1 LE Low energy consumption
Others
  • AVRCP (Audio/Visual Remote Control Profile)
  • HID (Human Interface Profile)
  • LE (Low Energy)
  • OPP (Object Push Profile)
  • APT-x
  • LDAC
  • SBC
  • AAC
  • A2DP (Advanced Audio Distribution Profile)
  • LE (Low Energy)
  • APT-x
  • LDAC
  • SBC
  • AAC

Navigation
Navigation
  • GPS
  • A-GPS
  • GLONASS
  • Beidou
  • QZSS
  • Galileo
  • GPS (L1+L5)
  • GLONASS (L1)
  • BeiDou (B1)
  • Galileo (E1+E5a)
  • BeiDou (B2)
  • NavIC System
  • QZSS (L1 + L5)
  • GPS
  • A-GPS
  • GLONASS
  • Beidou
  • QZSS
  • Galileo
  • GPS (L1+L5)
  • Galileo (E1+E5a)
  • NavIC System
  • QZSS (L1 + L5)

USB
USB
  • Charging
  • Mass Storage
  • USB On-The-Go (OTG)
  • USB Type C
  • USB Host 3.1
  • Charging
  • Mass Storage
  • USB On-The-Go (OTG)
  • USB Type C

SAR
European measurement

The European Union sets a limit of 2 W/kg averaged over 10 grams of tissue.

 -- --
American measurement

The FCC limit is 1.6 W/kg measured in a volume of 1 gram of tissue

 -- --

Others
Others
  • NFC
  • Audio Jack
  • Computer sync
  • OTA sync
  • Tethering.
  • DLNA
  • NFC
  • Computer sync
  • OTA sync
  • Infrared
  • Tethering.
  • VoLTE

User reviews

Does it have good coverage for calls?
9.7
8.4
Quality of the GPS
9.7
8.5
And the WiFi?
9.7
9.6
Number of reviews
7 reviews
5 reviews

Battery

Battery
Capacity
4000 mAh
See more details
4520 mAh
See more details
Type Li-Polymer Li-Polymer
Fast charge Yes,
30.0W 		Yes,
33.0W
Others
  • Non-removable
  • Non-removable

User reviews

How long does the battery last?
  • 0%
    Less than half day
  • 14%
    Less than a day
  • 43%
    One day
  • 29%
    More than one day
  • 14%
    Two days or more
  • 0%
    Less than half day
  • 0%
    Less than a day
  • 40%
    One day
  • 60%
    More than one day
  • 0%
    Two days or more
Number of reviews
7 reviews
5 reviews

Software

Software
Operating System
  • Android 13
    Android 13 Tiramisu, 4 years ago
  • HyperOS (Android 14)
    Android 14 Upside-down cake, 3 years ago
Google Services With Google Mobile Services Without Google Mobile services

User reviews

Did it come with preinstalled applications?
  • 29%
    It comes with a clean operating system
  • 71%
    It has preinstalled apps but they don't bother me
  • 0%
    It has preinstalled apps that I can't uninstall
  • 20%
    It comes with a clean operating system
  • 80%
    It has preinstalled apps but they don't bother me
  • 0%
    It has preinstalled apps that I can't uninstall
Do you regularly receive updates?
  • 0%
    Never
  • 0%
    Once a year
  • 50%
    Every six months
  • 50%
    Every two months or less
  • 0%
    Never
  • 0%
    Once a year
  • 33%
    Every six months
  • 67%
    Every two months or less
Number of reviews
7 reviews
5 reviews
Prices
Prices unavailable
Prices unavailable

Others

Common comparisons