| Hardware and OS | Realme X3 5G | |
| Operating system | Android 10.0, Realme UI | |
| Processor | Octa-core (1x2.4 GHz Kryo 475 Prime, 1x2.2 GHz Kryo 475 Gold & 6x1.8 GHz Kryo 475 Silver) | |
| GPU | Adreno 620 | |
| RAM | 6 GB, 8 GB, 12 GB | |
| Internal Storage | 64 GB, 128 GB, 256 GB | |
| Memory Card Slot | microSDXC (dedicated slot) | |
| User Interface | Yes | |
| Display | Realme X3 5G | other phones |
| Type | IPS LCD | |
| Size | 6.57 inches | |
| Resolution | 1080 x 2400 pixels | |
| Colors | 16M | |
| Pixel Density | ~401 ppi density | |
| Touchscreen | Capacitive touchscreen | |
| Connectivity | Realme X3 5G | other phones |
| 4G Network | LTE | |
| 5G Network | 5G SA/NSA | |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| GPS | Yes, with dual-band A-GPS, GLONASS, BDS, GALILEO | |
| NFC | No | |
| USB | 2.0, Type-C 1.0 reversible connector | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A, 5G (1.9 Gbps DL) | |
| SIM | Nano SIM | |
| Dual SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Wireless Charging | No | |
| Camera | Realme X3 5G | other phones |
| Main camera | 48 MP (wide), 8 MP (ultrawide), 2 MP (macro), 2 MP (depth) | |
| Features | LED flash, HDR, panorama | |
| Image | 2160p | |
| Selfie camera | 16 MP (wide) | |
| Multimedia | Realme X3 5G | other phones |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Radio | Yes | |
| Video Playback | Yes | |
| Video Out | Yes | |
| Ring Tones | Yes | |
| 3.5 mm Jack | Yes | |
| Design | Realme X3 5G | other phones |
| Waterproof | No | |
| Battery | Realme X3 5G | other phones |
| Capacity | Li-Po 4100 mAh battery, Fast charging | |
| Placement | Non-Removable | |
| Other | Realme X3 5G | other phones |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass, | |
