In depth comparison and review of Xiaomi Redmi Note 9S and OPPO Reno4 5G. Compare sizes, cameras, batteries, memory, and other important specifications and features to easily choose the right phone for you. Our goal is to help you uncover differences between the products and find the phone that will best fit your needs.
| DESIGN AND DIMENSIONS | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | - | CPH2091 | |
| Form Factor | Touch | Touch | |
| Height | 165.75 mm | 159.3 mm | Xiaomi Redmi Note 9S has greater height than OPPO Reno4 5G. |
| Width | 76.68 mm | 74 mm | Xiaomi Redmi Note 9S has greater width than OPPO Reno4 5G. |
| Depth | 8.8 mm | 7.8 mm | OPPO Reno4 5G is narrower than Xiaomi Redmi Note 9S. |
| Weight | 209 g | 183 g | OPPO Reno4 5G is lighter than Xiaomi Redmi Note 9S. |
| Body Colour | Aurora blue | Space black | Galactic blue | |
| Body Material | Curved 3D glass, Gorilla glass 5 | - | |
| Protection | Dustproof, splashproof | - | |
| Waterproof (Water-resistant) | - | - | |
| IP rating | - | IP54 | |
| SAR Value | 0.98 W/kg (body), 0.72 W/kg (head), 2.35 W/kg (limb) | 0.886 W/kg (head), 1.155 W/kg (body), 2.165 W/kg (limb) | |
| Integrated Components | Ultra-linear speakers | - | |
| Connector Type | USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM | Nano SIM | |
| SIM Card Qty | Dual-SIM | Dual-SIM | |
| SIM Card Configuration Details | Nano SIM + nano SIM/microSD | - |
| DISPLAY | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | - | AMOLED | |
| Screen Size (Display Size) | 6.67" | 6.4" | Xiaomi Redmi Note 9S has larger screen size than OPPO Reno4 5G. |
| Screen Resolution (Display Resolution) | 2400 x 1080 pixels | 2400 x 1080 pixels | Both phones have the same screen resolution. |
| Display Format | Full HD+ | Full HD+ | |
| Pixel Density | - | 409 ppi | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 800 cd/m² | |
| Colour Depth | - | 16.7 million colours | |
| Contrast Ratio | 1500:1 | 800000:1 | OPPO Reno4 5G has better display contrast ratio than Xiaomi Redmi Note 9S. |
| HDR | Yes | - | Xiaomi Redmi Note 9S has HDR. |
| Display Refresh Rate | - | 60 Hz | |
| Display Features | Reading mode 2.0, Dot Display | DCI-P3 Wide colour gamut, Dark mode, 180Hz sampling rate | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 5 (scratch resistant glass) | Corning Gorilla Glass (scratch resistant glass) |
| PROCESSOR | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 720G | Qualcomm Snapdragon 765G | |
|---|---|---|---|
| Clock Speed | 2.3 GHz | 2.4 GHz | OPPO Reno4 5G has higher clock speed than Xiaomi Redmi Note 9S. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| 64-bit Architecture | Yes | - | Xiaomi Redmi Note 9S has 64-bit architecture. |
| Graphics System (GPU) | Qualcomm ADRENO 618 | Qualcomm ADRENO 620 |
| MEMORY | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| RAM | 4 GB | LPDDR4X SDRAM - 8 GB | OPPO Reno4 5G has more RAM than Xiaomi Redmi Note 9S. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 64 GB | 128 GB | OPPO Reno4 5G has more internal memory than Xiaomi Redmi Note 9S. |
| Memory Interface | - | UFS 2.1 | |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 512 GB | - |
| CAMERA | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 3 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | 48 Megapixel | Both phones have the same camera resolution. |
| Sensor Size | 1/2" | 1/2" | Both phones have the same camera sensor size. |
| Sensor Name | - | Sony Exmor RS IMX586 sensor | |
| Lens Aperture | F/1.79 | F/1.7 | OPPO Reno4 5G has better lens aperture than Xiaomi Redmi Note 9S. |
| Lens Construction | 6-element | 6-element | |
| Field of View (FoV) | 79 degree(s) | - | |
| Pixel Size | 0.8 μm | 0.8 μm | Both phones have the same camera pixel size. |
| Focus Adjustment | Automatic | Automatic | |
| Laser Auto Focus | - | Yes | |
| Minimum Focal Length (Focal Distance) | - | 26 mm | |
| Special Effects | HDR, Kaleidoscope | HDR, Bokeh effect | |
| Camera Modes | Burst mode, Panorama, night mode, Smart ultra-wide angle mode, Photo timer, Custom watermark, Documents, Beautify, Levelling, Cinematic portraits | Time-lapse mode, night mode, Expert Mode, Text, AI Beautify, AI Portait, Pano mode, Dazzle Colour Mode | |
| Face Recognition (Face ID) | Face recognition | - | Xiaomi Redmi Note 9S has face detection. |
| Light Source | Dual LED flash | LED flash | |
| Still Image Resolutions | 8000 x 6000 | 8000 x 6000 | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1920 x 1080 (1080p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 960 fps | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1920 x 1080 (1080p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, 1280 x 720 (720p) at 60 fps | |
| Camera Features (Functions) | 4-in-1 Super Pixel, AI scene detection, Portrait mode with background blurring, Ultra wide-angle edge distortion correction, Steady handheld night photography, full screen frame, AI watermark | Noise reduction, Phase Detect Auto-Focus (PDAF), Electronic Image Stabiliser (EIS), Closed loop processing, 4-in-1 Pixel technology, Ultra Steady Video, contrast detection auto-focus (CDAF), laser detection auto focus (LDAF) |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 8 Megapixel | 8 Megapixel | Both phones have the same second camera resolution. |
|---|---|---|---|
| Lens Type (2nd Camera) | Ultra wide-angle lens | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | F/2.2 | F/2.2 | Both phones have the same second camera lens aperture. |
| Lens Element Qty (2nd Camera) | - | 5-element | |
| Field of View (2nd Camera) | 119 degree(s) | 119 degree(s) | Both phones have the same second camera lens field of view. |
| Pixel Size (2nd Camera) | 1.12 μm | - | |
| Minimum Focal Length (2nd Camera) | - | 16 mm | |
| Camera Functions (2nd Camera) | - | Monochrome | |
| Camera Modes (2nd Camera) | - | Ultra Night Mode 3.0 | |
| Camera Features (2nd Camera) | - | 5-piece lens, Ultra Steady Video Pro |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 5 Megapixel | 2 Megapixel | Xiaomi Redmi Note 9S has higher resolution third camera than OPPO Reno4 5G. |
|---|---|---|---|
| Lens Aperture (3rd Camera) | F/2.4 | F/2.4 | Both phones have the same lens aperture of the third camera. |
| Lens Element Qty (3rd Camera) | - | 3-element | |
| Pixel Size (3rd Camera) | 1.12 μm | - | |
| Camera Functions (3rd Camera) | Macro camera | - | |
| Camera Features (3rd Camera) | AF (2cm-10cm) | - |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (4th Camera) | F/2.4 | - | |
| Pixel Size (4th Camera) | 1.75 μm | - | |
| Camera Functions (4th Camera) | Depth camera | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 2 | |
|---|---|---|---|
| Sensor Resolution (Front) | 16 Megapixel | 32 Megapixel | OPPO Reno4 5G has better front camera resolution than Xiaomi Redmi Note 9S. |
| Sensor Name (Front) | - | Sony Exmor RS IMX616 sensor | |
| Lens Aperture (Front) | F/2.48 | F/2.4 | OPPO Reno4 5G has better front lens aperture than Xiaomi Redmi Note 9S. |
| Lens Element Qty (Front) | - | 5-element | |
| Pixel Size (Front) | 1 μm | 0.8 μm | Xiaomi Redmi Note 9S has larger front camera pixel size than OPPO Reno4 5G. |
| Special Effects (Front) | HDR | - | |
| Camera Modes (Front) | Panoramic selfies, AI portrait mode, AI Beautify, Slo-mo Selfie | Panorama, Time-lapse mode, Slow motion mode, night mode, Expert Mode, AI Beauty, Portrait | |
| Face Recognition (Face ID) | Face recognition | - | Xiaomi Redmi Note 9S has face detection. |
| Light Source (Front) | Display flash | Display flash | |
| Still Image Resolutions (Front) | - | 6560 x 4928 | |
| Video Resolutions (Front) | - | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps | |
| Camera Features (Front) | AI scene detection, Palm shutter, AI silhouette detection | Electronic Image Stabiliser (EIS), 5P lens |
| SECOND FRONT CAMERA |
|---|
| Sensor Resolution (2nd Front) | - | 2 Megapixel | |
|---|---|---|---|
| Lens Aperture (2nd Front) | - | F/2.4 | |
| Pixel Size (2nd Front) | - | 1.75 μm | |
| Camera Functions (2nd Front) | - | Portait camera | |
| Camera Features (2nd Front) | - | 3-piece lens |
| BATTERY AND CHARGING | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Battery Capacity (Battery Size) | 5020 mAh | 4020 mAh | Xiaomi Redmi Note 9S has larger battery capacity than OPPO Reno4 5G. |
|---|---|---|---|
| Fast Charging Technology | - | SuperVOOC 2.0 Flash Charge | OPPO Reno4 5G has fast charging technology. |
| Recharge Time (Charging Time) | - | 36 min | |
| Standby Time | - | 390 hours | |
| Talk Time | 1980 minutes | 1560 minutes | Xiaomi Redmi Note 9S has longer battery life when making calls than OPPO Reno4 5G. |
| Run Time Details | Talk: up to 1980 min Gaming: up to 13 hrs Playback (Music): up to 147 hrs Navigation: up to 16 hrs |
Standby: up to 390 hrs Talk: up to 1560 min Playback (Music): up to 37 hrs Playback (video): up to 17.1 hrs |
|
| Battery Technology | Lithium Ion | - |
| CELLULAR | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 5G | OPPO Reno4 5G has more advanced generation mobile network. |
| Operating System | - | ColorOS 7.2 (based on Android 10) | |
| User Interface | MIUI 10 | - | |
| Payment Technology | Google Pay | - | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou, Galileo | GPS, A-GPS, GLONASS, BeiDou, Galileo, QZSS |
| COMMUNICATIONS | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, VoLTE, FDD-LTE, TDD-LTE | FDD-LTE, TDD-LTE, 5G NR FR1 | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1900 GSM, 2100 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8 | Band 1, Band 2, Band 4, Band 5, Band 6, Band 8, Band 19 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 1700, 850, 800, 900, 800 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40 | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 17, Band 18, Band 19, Band 20, Band 26, Band 28, Band 32, Band 38, Band 39, Band 40, Band 41, Band 66 | |
| 4G LTE Frequency | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300 | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 850+, FDD 700 APT, FDD 1500 L, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | |
| 5G NR Band | - | N1, n3, n5, n7, n8, n20, n28, n38, n41, n77, n78, n40 | |
| 5G NR Frequency | - | FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, TDD TD 3700, TDD TD 3500, TDD 2300 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac | IEEE 802.11a/b/g/n/ac | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.1 | |
| NFC | - | Yes | OPPO Reno4 5G has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Supported Digital Audio Standards | WAV, AAC, AMR, MP3, FLAC, APE (Monkey's Audio), MP4 | WAV, WMA, AAC, AMR, MP3, FLAC, OGG, APE (Monkey's Audio), apt-X, LDAC, MID, SBC, apt-X HD, APTX-TWS+ | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, XviD, M4V, MP4 | MKV, FLV, AVI, MOV, WMV, 3GP, MP4 | |
| Sound Enhancements | - | Dolby Atmos sound technology | |
| Audio Amplifier | Smart PA | - |
| FEATURES | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, digital compass, gyro sensor, distance sensor, infrared (IR) sensor, In-screen ambient light sensor | Accelerometer, ambient light sensor, proximity sensor, pedometer, gyro sensor, geomagnetic sensor, gravity sensor | |
| Security Devices | Face recognition, fingerprint reader (side) | Fingerprint reader (under display) | |
| Security Technology | A.I. face recognition | - | |
| Additional Phone Features | Infrared remote control, AI face unlock, Qualcomm 5th generation AI Engine, Z-axis linear vibration motor | MU-MIMO technology, Google Lens |
| OTHERS | Xiaomi Redmi Note 9S | OPPO Reno4 5G |
|---|
| Included Accessories | Protective cover, SIM card removal tool, USB-C cable, 18W charger | Headphones, power adapter, SIM card removal tool, USB-C cable, protective case | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland | IP54, TUV Rheinland Certified Safe Fast-Charge System |
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