| Hardware and OS | Xiaomi Redmi K40 Ultra | |
| Operating System | Android v11 | |
| Processor | 3 GHz, Octa Core Processor | |
| Chipset | MediaTek Dimensity 1200 | |
| Cores | 1x3.0 GHz Cortex-A78 & 3x2.6 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55 | |
| RAM | 8 GB | |
| Internal Memory | 128 GB | |
| Memory Card Slot | No | |
| Graphics | Mali-G77 MC9 | |
| Dual Sim | Yes | |
| Sim Size | Nano Nano SIM | |
| Sim Type | Dual Sim, GSM GSM | |
| Display | Xiaomi Redmi K40 Ultra | other phones |
| Screen Size | 6.67 inches, 1080 x 2400 pixels, 120 Hz | |
| Display Type | Color OLED screen (16M) | |
| Pixel Density | ~395 PPI | |
| Screen-to-Body Ratio | ~ 86.3% | |
| Touch Screen | Yes, with Multitouch | |
| Display aspect ratio | 20:9 | |
| Connectivity | Xiaomi Redmi K40 Ultra | other phones |
| 3G Network | Yes | |
| 4G Network | Yes | |
| 5G Network | Yes | |
| Bluetooth | Yes, v5.2 | |
| EDGE | Yes | |
| GPRS | Yes | |
| USB | Yes, USB-C | |
| USB Features | USB Tethering, USB on-the-go, USB Charging | |
| VoLTE | Yes, Dual Stand-By | |
| Wifi | Yes, with wifi-hotspot | |
| Multimedia | Xiaomi Redmi K40 Ultra | other phones |
| Email | Yes | |
| FM Radio | Yes | |
| Music | Yes | |
| Video | Yes | |
| Browser | Yes | |
| Java | No | |
| Battery | Xiaomi Redmi K40 Ultra | other phones |
| Battery capacity | 5065 mAh, Li-Po Battery | |
| Type | Non-Removable Battery | |
| Fast Charging | 67W Fast Charging | |
| Other | Xiaomi Redmi K40 Ultra | other phones |
| Fingerprint Sensor | Yes, In Display | |
| Face Unlock | Yes | |
| Dust Resistant | Yes | |
| Features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
