Asus Zenfone 8 vs Xiaomi Redmi K40S

Network
2G network

GSM 850, 900, 1800, 1900

GSM 850, 900, 1800, 1900; CDMA 800
3G network

HSDPA 800, 850, 900, 1700(AWS), 1900, 2100

HSDPA 850, 900, 1700(AWS), 1900, 2100; CDMA2000 1x
4G network

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 34, 38, 39, 40, 41, 42 - global; 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 30, 34, 38, 39, 40, 41, 42, 66, 71 - USA

LTE frequency band 1, 2, 3, 4, 5, 8, 18, 19, 26, 34, 38, 39, 40, 41, 42
5G network

5G band 1, 2, 3, 5, 7, 8, 12, 20, 28, 38, 77, 78 SA/NSA - global; 1, 2, 3, 5, 7, 8, 12, 20, 25, 38, 40, 66, 71, 77, 78 SA/NSA - USA

5G band 1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
LTE speed

LTE-A (5CA), Cat20, 2000 Mbps download, 150 Mbps upload

LTE-A
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Glass front (Gorilla Glass Victus), glass back (Gorilla Glass 3), aluminum frame

Glass front (Gorilla Glass 5), plastic back
SIM

Dual SIM (Nano-SIM, dual stand-by)

Dual SIM (Nano-SIM, dual stand-by)
Height

148 mm

163.2 mm
Width

68.5 mm

76 mm
Thickness

8.9 mm

7.7 mm
Weight

169 g

195 g
Waterproof

IP68 (1.5m and 30 mins)

-
Splash resistant

-

Yes
Dust proof

IP68

-
Colors

Black, Silver

Black, Blue, Gray, Green

Display
Display type

Super AMOLED

AMOLED
Physical size

5.9 inches

6.67 inches
Resolution

1080 x 2400 pixels

1080 x 2400 pixels
Pixel density

446 ppi

395 ppi
Display colors

16777216

16777216
Protection

Scratch resistant, 2.5D curved glass screen, Corning Gorilla Glass Victus

Scratch resistant, 2.5D curved glass screen, Corning Gorilla Glass 5
Display features

Always-on display, 120Hz, HDR10+, 700 nits (HBM), 1100 nits (peak)

120Hz, HDR10+, 1300 nits (peak)
DxOMark display score

81

-

Hardware
CPU

Octa-core

Octa-core
CPU

Single-core 2.84 GHz Kryo 680

Single-core 3.2 GHz Kryo 585
CPU(second)

Triple-core 2.42 GHz Kryo 680

Triple-core 2.42 GHz Kryo 585
CPU(third)

Quad-core 1.8 GHz Kryo 680

Quad-core 1.80 GHz Kryo 585
Chipset

Qualcomm SM8350 Snapdragon 888 5G

Qualcomm SM8250-AC Snapdragon 870 5G
GPU

Adreno 660

Adreno 650
Memory RAM

6, 8, 12, 16 GB

6, 8, 12 GB
Internal storage

128, 256 GB

128, 256 GB
Memory card

No

No
Storage

UFS 3.1

UFS 3.1

Main camera
Camera type

Dual

Triple
Main camera

(wide) , 64 MP, f/1.8 , 78˚ , 26 mm, 1/1.73" , 0.8 µm

(wide) , 48 MP, f/1.8 , 1/2" , 0.8 µm
(ultrawide) , 12 MP, f/2.2 , 14 mm, 1/2.93" , 1.12 µm

(ultrawide) , 8 MP, 119˚
(macro) , 2 MP, f/2.4
Primary camera resolution

9280 x 6920 pixels

8000 x 6000 pixels
Primary camera video

8K@24fps, 4K@30/60/120fps, 1080p@30/60/240fps, 720p@480fps; gyro-EIS, HDR

4K@30fps, 1080p@30/60/120fps, 720p@960fps; gyro-EIS
Primary camera flash

LED flash

dual-LED dual-tone flash
Camera features

Autofocus, continuous shooting, digital zoom, optical zoom, digital image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, macro-mode, phase detection autofocus, laser autofocus, RAW

Autofocus, continuous shooting, digital zoom, optical zoom, digital image stabilization, optical image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, phase detection autofocus

Selfie camera
Selfie camera type

Single

Single
Selfie camera

(standard) , 12 MP, f/2.5 , 28 mm, 1/2.93" , 1.22 µm

(wide) , 20 MP
Selfie camera resolution

4032 x 3024 pixels

-
Selfie camera features

Dual-pixel phase detection autofocus, face unlock, HDR

Face unlock, HDR
Selfie camera video

4K@30fps, 1080p@30/60fps

1080p@30/120fps

Connectivity
WLAN

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5GHz, 802.11ac, 802.11ax

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5GHz, 802.11ac, 802.11ax
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

Yes

Yes
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 2.0

Type-C 2.0
USB On-The-Go

Yes

Yes
Bluetooth

v5.2

v5.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

aptX HD, aptX Adaptive

-
NFC

Yes

Yes
GPS

Yes, with dual-band A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

Yes
BDS

Yes

Yes
QZSS

Yes

Yes
NavIC

Yes

Yes

Features
Sensors

Accelerometer, compass, fingerprint, gyroscope, proximity

Accelerometer, color spectrum, compass, fingerprint, gyroscope, proximity

Battery
Battery type

Li-Po

Li-Po
Battery capacity

4000 mAh

4500 mAh
Battery removable

Non-removable

Non-removable
Fast battery charging

Quick Charge 4+ (60% in 25 min, 100% in 80 min)

Quick Charge 3+, 67W (100% in 38 min)
Reverse charging

Yes

-