Xiaomi Redmi K40 vs vivo X Fold

Network
2G network

GSM 850, 900, 1800, 1900; CDMA 800

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

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

HSDPA 800, 850, 900, 1700(AWS), 1900, 2100; CDMA2000 1x
4G network

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 18, 19, 26, 28, 34, 38, 39, 40, 41, 42

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 28, 32, 66
5G network

5G band 1, 3, 28, 41, 77, 78 SA/NSA/Sub6

5G band 1, 2, 3, 5, 7, 8, 12, 20, 28, 38, 40, 41, 66, 77, 78, 79 SA/NSA
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
LTE speed

LTE-A, 1174 Mbps download, 210 Mbps upload

LTE-A
GPRS

Yes

Yes
EDGE

Class 8

Yes

Display
Display type

Super AMOLED

Foldable LTPO AMOLED
Physical size

6.67 inches

8.03 inches
Resolution

1080 x 2400 pixels

1916 x 2160 pixels
Pixel density

395 ppi

360 ppi
Display colors

16777216

16777216
Protection

Scratch resistant, 3D curved glass screen, Corning Gorilla Glass 5

Scratch resistant
Display features

120Hz, HDR10+, 1300 nits (peak), sunscreen 3.0, night light screen

120Hz, HDR10+
Cover display

-

AMOLED
Cover display physical size

-

6.53 inches
Cover display resolution

-

1080 x 2520 pixels

Hardware
CPU

Octa-core

Octa-core
CPU

Single-core 3.2 GHz Kryo 585

Single-core 3.0 GHz Cortex-X2
CPU(second)

Triple-core 2.42 GHz Kryo 585

Triple-core 2.50 GHz Cortex-A710
CPU(third)

Quad-core 1.80 GHz Kryo 585

Quad-core 1.8 GHz Cortex-A510
Chipset

Qualcomm SM8250-AC Snapdragon 870 5G

Qualcomm SM8450 Snapdragon 8 Gen 1
GPU

Adreno 650

Adreno 730
Memory RAM

6, 8, 12 GB

12 GB
Internal storage

128, 256 GB

256, 512 GB
Memory card

No

No
Storage

UFS 3.1

UFS 3.1

Main camera
Camera type

Triple

Quad
Main camera

(wide) , 48 MP, f/1.8 , 26 mm, 1/2" , 0.8 µm

(wide) , 50 MP, f/1.8 , 1/1.57" , 1.0 µm
(ultrawide) , 8 MP, f/2.2 , 119˚

(periscope telephoto) , 8 MP, f/3.4 , 125 mm, 5x optical zoom
(macro) , 5 MP, 50 mm, 1/5.0" , 1.12 µm

(telephoto) , 12 MP, 47 mm, f/2.0 , 2x optical zoom
(ultrawide) , 48 MP, f/2.2 , 114˚ , 14 mm
Primary camera resolution

8000 x 6000 pixels

8192 x 6144 pixels
Primary camera video

4K@30fps, 1080p@30/60/120/240/960fps, gyro-EIS

8K@30fps, 4K@30/60fps, 1080p@30/60fps, gyro-EIS
Primary camera optics

-

Zeiss optics
Primary camera flash

LED flash

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

Selfie camera
Selfie camera type

Single

Single
Selfie camera

(wide) , 20 MP, 1/3.4" , 0.8 µm

(wide) , 16 MP, f/2.5
Selfie camera resolution

5184 x 3880 pixels

4608 x 3456 pixels
Selfie camera features

Face unlock, HDR

Digital image stabilization, face detection, face unlock, HDR
Selfie camera video

1080p@30fps, 720p@120fps

1080p@30fps

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 3.1
USB On-The-Go

Yes

Yes
Bluetooth

v5.1

v5.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

-

aptX HD
Infrared

Yes

Yes
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, color spectrum, compass, fingerprint, gyroscope, proximity

Accelerometer, barometer, compass, fingerprint, gyroscope, proximity

Battery
Battery type

Li-Po

Li-Po
Battery capacity

4520 mAh

4600 mAh
Battery removable

Non-removable

Non-removable
Fast battery charging

Quick Charge 3.0 (100% in 52 min)

Yes, 66W (100% in 37 min)
Wireless reverse charging

-

Yes, 10W
Fast wireless charging

-

Yes, 50W
Talk time 3G

-

22.6 h