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Samsung Galaxy A51 8GB vs Xiaomi Redmi A3x

2G Network SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900   SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 850 / 900 / 1900 / 2100   HSDPA 850 / 900 / 1900 / 2100  
4G Network LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 38(2600), 40(2300), 41(2500)   LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 158.4 x 73.7 x 7.9 mm   168.3 x 76.3 x 8.3 mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)   Dual Sim, Dual Standby (Nano-SIM)  
Weight 172 g   193 g  
Display Type Super AMOLED Capacitive Touchscreen, 16M Colors, Multitouch   IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz  
Display Size 1080 x 2400 Pixels (~405 PPI)   6.74 Inches   720 x 1650 Pixels (~267 PPI)  
Protection Corning Gorilla Glass 3  
Memory 128GB Built-in, 8GB RAM   128GB Built-in, 6GB RAM (+6GB Extended RAM)  
Card slot microSD card (supports up to 1TB) (dedicated slot)   microSDXC (dedicated slot)  
GPRS Yes Yes
EDGE Yes Yes
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot   Wi-Fi 802.11 a/b/g/n/ac  
BlueTooth v5.0 with A2DP, LE   v5.3 with A2DP, LE  
USB 2.0, Type-C 1.0 reversible connector   USB Type-C 2.0  
NFC Yes   No  
GPS Yes + A-GPS support & Glonass, BDS, GALILEO   Yes + GPS, GLONASS, GALILEO, BDS  
Main Camera Geo-tagging, touch focus, face detection, panorama, HDR, Video ([email protected])   Dual camera: 8 MP + 0.08 MP, LED Flash   HDR, Video (1080p@30fps)  
Front Camera 32 MP, f/2.2, 25mm (wide), 1/2.8", HDR, Video ([email protected])   5 MP  
OS Android 10.0 OS   Android 14 (Go edition)  
Chipset Exynos 9611 (10nm)   Mediatek Helio G36 (12 nm)  
Processor Octa-core (4 x 2.3 GHz Cortex-A73 + 4 x 1.7 GHz Cortex-A53)   Octa-core (4 x 2.2 GHz Cortex-A53 + 4 x 1.6 GHz Cortex-A53)  
GPU Mali-G72 MP3   PowerVR GE8320  
Sensors Accelerometer, gyro, proximity, compass, Fingerprint (under display, optical)   Accelerometer, Fingerprint (side mounted)  
Browser HTML5   HTML5  
Sound 3.5mm Audio Jack, MP3/WAV/WMA/eAAC+/FLAC player, MP4/WMV/H.265 player, Speaker Phone   3.5mm Audio Jack, 24-bit/192kHz audio, Speaker Phone  
Colors Prism, Crush Black, White, Blue, Pink   Various  
Battery - Fast battery charging 15W   (Li-Po Non removable), 5000 mAh   - Battery charging 10W  
Misc Active noise cancellation with dedicated mic, ANT+ support, Photo/video editor, Document viewer   SMS(threaded view), MMS, Email, Push Mail, IM   Photo/video editor, Document viewer