Compare Redmi Note 8 2021 vs Xiaomi Redmi Note 9 vs Redmi K40
Connectivity
Ports
USB-C 2.0, 3.5mm headphone
USB-C, 3.5mm headphone
USB-C
Wireless Connectivity
IR, WiFi 5, Bluetooth 5.2
NFC, IR, WiFi 5, Bluetooth 5.0
WiFi 6, Bluetooth 5.1
Construction
Battery | Capacity
4000 mAh (typ)
5020 mAh (typ)
4520 mAh
Camera | Front
13 MP, f/2.0, 1/3.1", 1.12µm
13MP, 1.12μm pixel size, 1/3.06" sensor size, f/2.25, 5P lens, 74°FOV
20MP
Camera | Rear | Depth
2 MP, f/2.4
2MP, 1/5" sensor size, 1.7μm pixel size, 3P lens, f/2.4 FF
Camera | Rear | Macro
2 MP, f/2.4
2MP, AF (2cm-10cm), 1.75μm pixel size, f/2.4 aperture
Camera | Rear | Telephoto
5MP
Camera | Rear | Ultra-Wide
8 MP, f/2.2, 120˚, 1/4.0", 1.12µm
8MP, FOV 118°, f/2.2, 1/4" sensor size, 1.2μm pixel size, 5P lens
8MP
Camera | Rear | Wide
48 MP, f/1.8, 26mm, 1/2.0", 0.8µm, PDAF
48MP, 1/2" sensor size, 1.6μm 4-in-1 Super Pixel, 0.8μm pixel size, f/1.79, AF, 6P lens, FOV 79.4°
48MP, Sony IMX582, f/1.79
Colors
Neptune Blue, Moonlight White, Space Black
Polar White, Midnight Grey, Forest Green, Onyx Black
Glossy Black, Icy White, and Dreamland
Material
Gorilla Glass 5 front and back, plastic frame
Corning Gorilla Glass 5
Corning Gorrila Glass 5
Speakers
Super linear speaker
Dual speakers
Dimensions
Size | Depth
8.35 mm / 0.33"
8.9 mm
7.8 mm
Size | Height
158.3 mm / 6.23"
162.3 mm
163.7 mm
Size | Width
75.3 mm / 2.96"
77.2 mm
76.4 mm
Weight
190 g / 6.7oz
199 g
196 g
Display
Aspect Ratio
19.5:9
19.5:9
20:9
Brightness
500 nits
450 nits
900 nits (typ) / 1300 nits (max)
Contrast Ratio
1500:1
5,000,000:1 (typical)
Display Color Depth
10-bit
Display Diagonal
6.3 inch
6.53 inch
6.67 inch
Display Type
IPS
Samsung E4 AMOLED (OLED)
Gamut
84% NTSC
100% DCI-P3
Pixel Density
409 ppi
Refresh Rate
120 Hz
Resolution
FHD+ 2340×1080
FHD+ 2340×1080
FHD+ 2400x1080
Function
Audio
Dolby Atmos
Bluetooth Codecs
AAC / LDAC / LHDC
Bluetooth Profiles
A2DP
Chipset
MediaTek Helio G85, 12nm manufacturing process
MediaTek Helio G85
Qualcomm Snapdragon 870
Fast Charging
18W fast charge
18W fast charge
55W wired turbo charging
GPS
GPS, A-GPS, GLONASS, GALILEO, BDS
GPS/ A-GPS / Galileo/ GLONASS / Beidou
GPS: L1+L5 / Galileo: E1+E5a / GLONASS: G1 / Beidou
Graphics
Mali-G52 MP2 GPU
ARM G52 MC2
Qualcomm Adreno 650 GPU
HDR
HDR10+
Operating System
Android 11, MIUI 12.5
MIUI 11
MIUI 12, Android 11
Processor
Octa-core (2x2.0 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55)
2x A75 2.0GHz, 6x A55 1.8GHz, Octa-core CPU
Qualcomm Kryo585, 8-core
SIM
2x Nano 4G LTE
2x Nano 4G LTE
Dual nano 5G
Security
Side-mounted fingerprint sensor
Sensor
Fingerprint, accelerometer, gyro, proximity, compass
Touch Screen
360Hz touch sampling rate
Tuner
FM radio
Video Recording
FHD @ 30fps
4K 30fps, FHD 960fps
Performance
Charging Time
52min to 100%
Memory | Capacity
4 GB
3 - 4 GB
6, 8, or 12 GB
Memory | Type
LPDDR4X
LPDDR5 5500Mbps
Power Supply
33 W
Storage
64 or 128 GB eMMC 5.1 storage + microSD
64 - 128 GB
128 or 256 GB UFS 3.1
Production
Debut
2021-05-25
2020-03-12
2021-02-25
Made In
China
China
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