| Hardware and OS | Oppo K9 | |
| Operating system | Android 11, ColorOS 11.1 | |
| Processor | Octa-core (1x2.8 GHz Kryo 475 Prime & 1x2.4 GHz Kryo 475 Gold & 6x1.8 GHz Kryo 475 Silver) | |
| Chipset | Qualcomm SM7250-AC Snapdragon 768G 5G (7 nm) | |
| Internal memory | 128GB 8GB RAM, 256GB 8GB RAM | |
| External memory | No | |
| GPU | Adreno 620 | |
| Display | Oppo K9 | other phones |
| Size | 6.43 inches, 99.8 cm2 | |
| Resolution | 1080 x 2400 pixels, 20:9 ratio | |
| Type | Super AMOLED, 90Hz, 430 nits (typ), 750 nits (peak) | |
| Main Camera | Oppo K9 | other phones |
| Camera | 64 MP, f/1.7, (wide), PDAF
8 MP, f/2.2, (ultrawide)
2 MP, f/2.4, (macro) | |
| Features | LED flash, HDR, panorama | |
| Video | 4K@30fps, 1080p@30/60/120fps; gyro-EIS | |
| Selfie camera | Oppo K9 | other phones |
| Camera | 32 MP, f/2.4, (wide) | |
| Video | 1080p@30fps | |
| Connectivity | Oppo K9 | other phones |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | |
| 3G Network | HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100 | |
| 4G Network | 1, 3, 4, 5, 8, 28, 34, 38, 39, 40, 41 | |
| 5G Network | 1, 3, 28, 41, 77, 78 SA/NSA | |
| Bluetooth | 5.0, A2DP, LE, aptX HD | |
| CDMA | CDMA 800 | |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, QZSS | |
| NFC | No | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A, 5G | |
| Technology | GSM / CDMA / HSPA / CDMA2000 / LTE / 5G | |
| USB | USB Type-C 2.0, USB On-The-Go | |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| Multimedia | Oppo K9 | other phones |
| 3.5 mm Jack | Yes | |
| Loudspeaker | Yes | |
| Radio | No | |
| Battery | Oppo K9 | other phones |
| Type | Li-Po 4300 mAh, non-removable | |
| Charging | Fast charging 65W, 100% in 35 min (advertised) | |
| Design | Oppo K9 | other phones |
| Colors | Black, Aurora | |
| Dimensions | 159.1 x 73.4 x 7.9 mm (6.26 x 2.89 x 0.31 in) | |
| Weight | 172 g (6.07 oz) | |
| SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Features | Oppo K9 | other phones |
| Sensors | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass | |
