| Hardware and OS | Asus ROG Phone 9 Ultimate | |
| Operating system | Android v11 | |
| Processor | Qualcomm SM8350 Snapdragon 888 (5 nm) | |
| RAM | 12 GB | |
| Internal Storage | 256 GB | |
| Display | Asus ROG Phone 9 Ultimate | other phones |
| Type | AMOLED | |
| Size | 6.78 inches | |
| Resolution | 1080 x 2340 Pixels | |
| Pixel Density | 395 ppi | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | |
| Connectivity | Asus ROG Phone 9 Ultimate | other phones |
| Network support | 5G , 4G , 3G, 2G | |
| WI-FI | Yes, Wi-Fi 802.11, b/g/n | |
| Gps | Yes, with A-GPS, Glonass | |
| Bluetooth | Yes, v5.2 | |
| NFC | Yes | |
| Dual SIM | Dual SIM, GSM GSM | |
| SIM size | SIM1: Nano, SIM2: Nano | |
| USB connectivity | Mass storage device, USB charging | |
| Camera | Asus ROG Phone 9 Ultimate | other phones |
| Main camera | 64 MP 13 MP 5 MP | |
| Front camera | 24 MP | |
| Front camera resolution | 24 MP, f/2.5, 27mm (wide), 0.9µm | |
| Camera features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes, LED Flash | |
| Autofocus | Yes | |
| Video recording | Yes | |
| Multimedia | Asus ROG Phone 9 Ultimate | other phones |
| Audio jack | 3.5 MM | |
| Loudspeaker | Yes | |
| Design | Asus ROG Phone 9 Ultimate | other phones |
| Height | 172.8 mm | |
| Width | 77.3 mm | |
| Thickness | 10.3 mm | |
| Weight | 238 ppi | |
| Colours | Phantom Black, Storm White | |
| Battery | Asus ROG Phone 9 Ultimate | other phones |
| Capacity | 6000 mAh | |
| Type | Li-Polymer | |
| Other | Asus ROG Phone 9 Ultimate | other phones |
| Fingerprint sensor | Yes | |
| Fingerprint sensor position | On-Screen | |
| Other sensors | Accelerometer, Gyro, Proximity, Compass | |
