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Choosing between two smartphones? Use MobilesIQ to compare mobile phone specifications, prices, processors, camera systems, display quality, RAM, storage and battery capacity side by side.
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Specification
OPPO F31 5G
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OPPO Find X9 Ultra
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Brand
OPPO
OPPO
Release Date
—
—
Operating System
Android 15
Android 16 with ColorOS 16
Processor
MediaTek Dimensity 6300
Qualcomm Snapdragon 8 Elite Gen 5
Processor Speed
Up to 2.4 GHz
Up to 4.61 GHz (reported CPU clock speed)
Screen Size
6.57 inches (approximately 6.5 inches)
6.82 inches
Display
AMOLED, flat display
LTPO AMOLED / ProXDR AMOLED, 10-bit colour
Resolution
1080 × 2372 pixels (FHD+)
QHD+, 3168 × 1440 pixels
Refresh Rate
120Hz
120Hz
Brightness
Up to 1,400 nits (high-brightness mode)
800 nits typical; 1,800 nits HBM; up to 3,600 nits peak as advertised
RAM
8GB LPDDR4X
12GB LPDDR5X
Storage
8GB + 128GB, 8GB + 256GB
12GB + 512GB
Battery
7,000 mAh, non-removable
7,050mAh typical, silicon-carbon
Fast Charging
Yes
Yes
Wireless Charging
No
Yes
Colour
Cloud Green, Midnight Blue, Bloom Red
Canyon Orange, Tundra Umber
Rear Camera
50MP main (f/1.8) + 2MP secondary (f/2.4)
200MP main + 50MP ultra-wide + 200MP 3× telephoto + 50MP 10× telephoto + 3.2MP monochrome sensor
Front Camera
16MP (f/2.4)
50MP with autofocus
Network
5G, 4G LTE, 3G, 2G
5G, 4G LTE, 3G, 2G
SIM
Dual Nano-SIM
Dual Nano-SIM support; eSIM supported
Connectivity
Wi-Fi 5, Bluetooth 5.4, GPS, USB Type-C, NFC
Wi-Fi 7, Bluetooth 6.0, USB-C 3.2 Gen 1, GPS, NFC
Security
In-display fingerprint sensor, face unlock
Ultrasonic in-display fingerprint sensor, face recognition
Dimensions
Approximately 158.2 × 75 × 8.0 mm
163.16 × 76.97mm; thickness approximately 8.7–9.1mm depending on colour
Weight
185 g
Approximately 235–236g
Performance Rating
7.2
9.5
Value Rating
8.0
7.8
Specification
OPPO F31 5G
—
—
OPPO Find X9 Ultra
—
—
Brand
OPPO
OPPO
Release Date
—
—
Operating System
Android 15
Android 16 with ColorOS 16
Processor
MediaTek Dimensity 6300
Qualcomm Snapdragon 8 Elite Gen 5
Processor Speed
Up to 2.4 GHz
Up to 4.61 GHz (reported CPU clock speed)
Screen Size
6.57 inches (approximately 6.5 inches)
6.82 inches
Display
AMOLED, flat display
LTPO AMOLED / ProXDR AMOLED, 10-bit colour
Resolution
1080 × 2372 pixels (FHD+)
QHD+, 3168 × 1440 pixels
Refresh Rate
120Hz
120Hz
Brightness
Up to 1,400 nits (high-brightness mode)
800 nits typical; 1,800 nits HBM; up to 3,600 nits peak as advertised
RAM
8GB LPDDR4X
12GB LPDDR5X
Storage
8GB + 128GB, 8GB + 256GB
12GB + 512GB
Battery
7,000 mAh, non-removable
7,050mAh typical, silicon-carbon
Fast Charging
Yes
Yes
Wireless Charging
No
Yes
Colour
Cloud Green, Midnight Blue, Bloom Red
Canyon Orange, Tundra Umber
Rear Camera
50MP main (f/1.8) + 2MP secondary (f/2.4)
200MP main + 50MP ultra-wide + 200MP 3× telephoto + 50MP 10× telephoto + 3.2MP monochrome sensor
Front Camera
16MP (f/2.4)
50MP with autofocus
Network
5G, 4G LTE, 3G, 2G
5G, 4G LTE, 3G, 2G
SIM
Dual Nano-SIM
Dual Nano-SIM support; eSIM supported
Connectivity
Wi-Fi 5, Bluetooth 5.4, GPS, USB Type-C, NFC
Wi-Fi 7, Bluetooth 6.0, USB-C 3.2 Gen 1, GPS, NFC
Security
In-display fingerprint sensor, face unlock
Ultrasonic in-display fingerprint sensor, face recognition
Dimensions
Approximately 158.2 × 75 × 8.0 mm
163.16 × 76.97mm; thickness approximately 8.7–9.1mm depending on colour
Weight
185 g
Approximately 235–236g
Performance Rating
7.2
9.5
Value Rating
8.0
7.8
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