Xiaomi Poco F4 vs Xiaomi Redmi K40S

Network
2G network

GSM 850, 900, 1800, 1900

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

HSDPA 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, 38, 40, 41

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

5G band 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 77, 78 SA/NSA

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

42.2 Mbps

42.2 Mbps
HSUPA speed

11.52 Mbps

5.76 Mbps
LTE speed

LTE-A

LTE-A
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Glass front (Gorilla Glass 5), glass back

Glass front (Gorilla Glass 5), plastic back
SIM

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

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

163.2 mm

163.2 mm
Width

76 mm

76 mm
Thickness

7.7 mm

7.7 mm
Weight

195 g

195 g
Splash resistant

IP53

Yes
Dust proof

IP53

-
Colors

Black, Green, Silver

Black, Blue, Gray, Green

Display
Display type

AMOLED

AMOLED
Physical size

6.67 inches

6.67 inches
Resolution

1080 x 2400 pixels

1080 x 2400 pixels
Pixel density

395 ppi

395 ppi
Display colors

1073741824

16777216
Protection

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

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

120Hz, HDR10+, Dolby Vision, 900 nits (HBM), 1300 nits (peak)

120Hz, HDR10+, 1300 nits (peak)

Hardware
CPU

Octa-core

Octa-core
CPU

Single-core 3.2 GHz Kryo 585

Single-core 3.2 GHz Kryo 585
CPU(second)

Triple-core 2.42 GHz Kryo 585

Triple-core 2.42 GHz Kryo 585
CPU(third)

Quad-core 1.8 GHz Kryo 585

Quad-core 1.80 GHz Kryo 585
Chipset

Qualcomm SM8250-AC Snapdragon 870 5G

Qualcomm SM8250-AC Snapdragon 870 5G
GPU

Adreno 650

Adreno 650
Internal storage

128, 256 GB

128, 256 GB
Memory RAM

6, 8, 12 GB

6, 8, 12 GB
Memory card

No

No
Storage

UFS 3.1

UFS 3.1

Main camera
Camera type

Triple

Triple
Main camera

(wide) , 64 MP, f/1.8 , 1/2.0" , 0.7 µm

(wide) , 48 MP, f/1.8 , 1/2" , 0.8 µm
(ultrawide) , 8 MP, f/2.2 , 119˚ , 1/4.0" , 1.12 µm

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

(macro) , 2 MP, f/2.4
Primary camera resolution

9280 x 6920 pixels

8000 x 6000 pixels
Primary camera video

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

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, 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

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

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
Infrared

Yes

-
NFC

Yes (market dependent)

Yes
GPS

Yes, with 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

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

Battery
Battery type

Li-Po

Li-Po
Battery capacity

4500 mAh

4500 mAh
Battery removable

Non-removable

Non-removable
Fast battery charging

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

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