Screen size
Poco C81xWinner: 6.9"+27%
Redmi 4 (4X)5.0"
Quick verdict
Poco C81x leads the measured specs 13-2.
Measured wins
Poco C81x
13
spec wins
Overall winner
Ties
6
equal specs
Redmi 4 (4X)
2
spec wins
Screen size
Technology
Poco C81x
GSM / HSPA / LTE
Redmi 4 (4X)
GSM / HSPA / LTE
2G bands
Poco C81x
GSM 850 / 900 / 1800 / 1900
Redmi 4 (4X)
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands
Poco C81x
HSDPA 850 / 900 / 2100
Redmi 4 (4X)
HSDPA 850 / 900 / 1900 / 2100
4G bands
Poco C81x
1, 3, 5, 8, 28, 40, 41
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
equal specsFront camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Redmi 4 (4X)
1, 3, 5, 7, 8, 38, 39, 40, 41
Speed
Poco C81x
HSPA, LTE
Redmi 4 (4X)
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/100 Mbps
Announced
Poco C81x
2026, April 23
Redmi 4 (4X)
2017, May. Released 2017, May
Status
Poco C81x
Available. Released 2026, April 23
Redmi 4 (4X)
Discontinued
Dimensions
Poco C81x
171.8 x 77.8 x 8.3 mm (6.76 x 3.06 x 0.33 in)
Redmi 4 (4X)
139.2 x 70 x 8.7 mm (5.48 x 2.76 x 0.34 in)
Weight
Poco C81x
193 g (6.81 oz)
Redmi 4 (4X)
150 g (5.29 oz)
SIM
Poco C81x
Nano-SIM + Nano-SIM
Redmi 4 (4X)
Nano-SIM + Micro-SIM
Other
Poco C81x
Dust and splash resistant
Redmi 4 (4X)
-
Build
Poco C81x
-
Redmi 4 (4X)
Glass front (Gorilla Glass), aluminum back, aluminum frame, plastic ends
Type
Poco C81x
IPS LCD, 120Hz, 650 nits (HBM)
Redmi 4 (4X)
IPS LCD
Size
Poco C81x
6.88 inches, 112.4 cm2 (~84.1% screen-to-body ratio)
Redmi 4 (4X)
5.0 inches, 68.9 cm2 (~70.7% screen-to-body ratio)
Resolution
Poco C81x
720 x 1640 pixels (~260 ppi density)
Redmi 4 (4X)
720 x 1280 pixels, 16:9 ratio (~294 ppi density)
Protection
Poco C81x
-
Redmi 4 (4X)
Corning Gorilla Glass (unspecified version)
OS
Poco C81x
Android 15, up to 2 major Android upgrades
Redmi 4 (4X)
Android 6.0.1 (Marshmallow), upgradable to 7.1.2 (Nougat), MIUI 11
Chipset
Poco C81x
Unisoc T7250 (12 nm)
Redmi 4 (4X)
Qualcomm MSM8940 Snapdragon 435 (28 nm)
CPU
Poco C81x
Octa-core (2x1.8 GHz Cortex-A75 & 6x1.6 GHz Cortex-A55)
Redmi 4 (4X)
Octa-core 1.4 GHz Cortex-A53
GPU
Poco C81x
Mali-G57 MP1
Redmi 4 (4X)
Adreno 505
Card slot
Poco C81x
microSDXC (dedicated slot)
Redmi 4 (4X)
microSDXC (uses shared SIM slot)
Internal
Poco C81x
64GB 3GB RAM
Redmi 4 (4X)
16GB 2GB RAM, 16GB 3GB RAM, 32GB 3GB RAM, 64GB 3GB RAM, 64GB 4GB RAM
Other
Poco C81x
-
Redmi 4 (4X)
eMMC 5.1
Single
Poco C81x
13 MP, f/2.2, (wide)
Redmi 4 (4X)
13 MP, f/2.0, PDAF
Features
Poco C81x
LED flash, HDR
Redmi 4 (4X)
LED flash, HDR, panorama
Video
Poco C81x
1080p@30fps
Redmi 4 (4X)
1080p@30fps
Single
Poco C81x
8 MP, f/2.0, (wide)
Redmi 4 (4X)
5 MP, f/2.2
Features
Poco C81x
HDR
Redmi 4 (4X)
-
Video
Poco C81x
1080p@30fps
Redmi 4 (4X)
1080p@30fps
Loudspeaker
Poco C81x
Yes
Redmi 4 (4X)
Yes
3.5mm jack
Poco C81x
Yes
Redmi 4 (4X)
Yes
WLAN
Poco C81x
Wi-Fi 802.11 a/b/g/n/ac, dual-band
Redmi 4 (4X)
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Bluetooth
Poco C81x
5.2, A2DP, LE
Redmi 4 (4X)
4.2, A2DP, LE
Positioning
Poco C81x
GPS, GALILEO, GLONASS, QZSS
Redmi 4 (4X)
GPS, GLONASS, BDS
NFC
Poco C81x
No
Redmi 4 (4X)
No
Radio
Poco C81x
FM radio
Redmi 4 (4X)
FM radio
USB
Poco C81x
USB Type-C 2.0, OTG
Redmi 4 (4X)
microUSB 2.0
Infrared port
Poco C81x
-
Redmi 4 (4X)
Yes
Sensors
Poco C81x
Fingerprint (side-mounted), accelerometer, compass
Redmi 4 (4X)
Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Other
Poco C81x
Virtual proximity sensing
Redmi 4 (4X)
-
Type
Poco C81x
5200 mAh
Redmi 4 (4X)
Li-Po 4100 mAh, non-removable
Charging
Poco C81x
15W wired 7.5W reverse wired
Redmi 4 (4X)
-
Stand-by
Poco C81x
-
Redmi 4 (4X)
Up to 432 h (3G)
Talk time
Poco C81x
-
Redmi 4 (4X)
Up to 36 h (3G)
Music play
Poco C81x
-
Redmi 4 (4X)
Up to 87 h
Colors
Poco C81x
Ice Blue, Crystal Black
Redmi 4 (4X)
Black, Gold
Price
Poco C81x
About 90 EUR
Redmi 4 (4X)
About 110 EUR
Models
Poco C81x
-
Redmi 4 (4X)
2016060, 2016090, MAG138, MAE136, Redmi 4, Redmi 4X
SAR
Poco C81x
-
Redmi 4 (4X)
0.77 W/kg (head) 0.83 W/kg (body)