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Realme C51 128GB vs Realme C100x 256GB

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 / 2100   HSDPA 900 / 2100  
4G Network LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)   LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
Dimensions 167.2 x 76.7 x 8 mm   166.48 x 78.23 x 8.78mm  
Sim Type Dual Sim, Dual Standby (Nano-SIM)   Nano-SIM + Nano-SIM  
Weight 186 g   219 g  
Display Type IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz, 560 nits (peak)   IPS LCD Capacitive Touchscreen   120Hz, 900 nits (HBM)  
Display Size 6.74 Inches   720 x 1600 Pixels (~260 PPI)   6.8 Inches   720 x 1570 Pixels (~255 PPI)  
Protection Panda Glass   ArmorShell glass, Mohs level 5  
Memory 128GB Built-in, 4GB RAM   256GB Built-in, 8GB RAM, eMMC 5.1  
Card slot microSDXC (dedicated slot)   microSDXC  
GPRS Yes —
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band   Wi-Fi 802.11 a/b/g/n/ac, dual-band  
BlueTooth v5.0 with A2DP, LE   v5.2 with A2DP, LE  
USB USB Type-C 2.0   USB Type-C 2.0, OTG  
NFC Yes   No  
GPS Yes + A-GPS support, & GLONASS, BDS, GALILEO   Yes + A-GPS support, & GLONASS, BDS, GALILEO  
Main Camera Dual Camera: 50 MP, f/1.8, 27mm (wide), 1/2.76", PDAF + 0.08 MP, f/3.0, (depth), LED Flash   HDR, panorama, Video (1080p@30fps)   Camera: 50 MP, f/1.8, (wide), PDAF Auxiliary lens, LED Flash   HDR, panorama, Video (1080p@30fps)  
Front Camera 5 MP, f/2.2, 28mm (wide), 1/5", HDR, Video (720p@30fps)   5 MP, f/2.2, (wide), Video (720p@30fps)  
OS Android 13 OS   Android 16 OS  
Chipset Unisoc Tiger T612 (12 nm)   Unisoc T7250 (12 nm)  
Processor Octa-core (2 x 1.8 GHz Cortex-A75 + 6 x 1.8 GHz Cortex-A55)   Octa-core (2 x 1.8 GHz Cortex-A75 + 6 x 1.6 GHz Cortex-A55)  
GPU Mali-G57   Mali-G57 MP1  
Sensors Accelerometer, Compass, Fingerprint (side-mounted), Proximity   Accelerometer, Compass, Fingerprint (side-mounted), Proximity  
Browser HTML5   HTML5  
Sound 3.5mm Audio Jack, Speaker Phone   3.5mm Audio Jack, Speaker  Phone  
Colors Mint Green, Carbon Black   Golden Coast, Deepblue Tides  
Battery (Li-Po Non removable), 5000 mAh   - Fast charging 33W wired, 0-50% in 28 min (advertised)   Li-ion Si-Ca 8000 mAh   - Fast battery 45W wired, 45W PPS, 13.5W PD, Reverse wired  
Misc SMS(threaded view), MMS, Email, Push Mail, IM   NFC 360? (market/region dependent), Glass front, plastic frame, plastic back, Photo/video editor, Document viewer   SMS(threaded view), MMS, Email, Push Mail, IM   Glass front, plastic frame, plastic back, IP64 dust tight and water resistant (water splashes), Drop resistant up to 2m, RGB light on the back (notifications, etc.)