Xiaomi MI 9 vs. Vivo X51 5G

Phone Comparison, Reviews and Tests

Side by side comparison and review of Xiaomi MI 9 and Vivo X51 5G. Compare sizes, cameras, batteries, memory capacities and other key specifications and features to simplify the choice of your perfect phone. Our goal is to make it easier for you to decide on the phone that will best meet your expectations by revealing the main differences between the products.

Phone Specifications Comparison

Xiaomi MI 9 vs. Vivo X51 5G Comparison Chart
DESIGN AND DIMENSIONS Xiaomi MI 9 Vivo X51 5G
Product Type Smartphone Smartphone
Manufacturer Model Number - V2006
Form Factor Touch Touch
Height 157.5 mm 158.46 mm Vivo X51 5G has greater height than Xiaomi MI 9.
Width 74.67 mm 72.8 mm Xiaomi MI 9 has greater width than Vivo X51 5G.
Depth 7.61 mm 8.04 mm Xiaomi MI 9 is narrower than Xiaomi MI 9.
Weight 173 g 181.5 g Xiaomi MI 9 is lighter than Xiaomi MI 9.
Body Colour Ocean blue | Piano black Alpha grey
Body Material Curved glass -
Waterproof (Water-resistant) - -
IP rating - IP53
SAR Value 1.301 W/kg (body), 1.389 W/kg (head) 1.205 W/kg (head), 1.239 W/kg (body), 3.086 W/kg (limb)
Connector Type USB Type-C - 24 pin USB-C USB Type-C - 24 pin USB-C
SIM Card Type (Size) Nano SIM Nano SIM
SIM Card Qty Dual-SIM Dual-SIM
DISPLAY Xiaomi MI 9 Vivo X51 5G
Display Type OLED display OLED display
Display Technology AMOLED AMOLED
Screen Size (Display Size) 6.39" 6.56" Vivo X51 5G has larger screen size than Xiaomi MI 9.
Screen Resolution (Display Resolution) 2340 x 1080 pixels 2376 x 1080 pixels Vivo X51 5G has better screen resolution than Xiaomi MI 9.
Display Format Full HD+ -
Pixel Density 403 ppi 398 ppi Xiaomi MI 9 has better pixel density than Vivo X51 5G.
Aspect Ratio - 19.8:9
Max Brightness 600 cd/m² 500 cd/m² Xiaomi MI 9 has better display brightness than Vivo X51 5G.
Colour Depth - 16.7 million colours
Contrast Ratio 60000:1 -
HDR Yes - Xiaomi MI 9 has HDR.
HDR Technology HDR10 -
Display Enhancement Technology Sunshine mode 2.0 -
Display Features Always-on display, Reading mode, Colour temperature adjustment, night mode, Wide Colour Gamut (WCG) -
Display Protection (Screen Protector) Fingerprint-resistant coating, Corning Gorilla Glass 6 (scratch resistant glass), oil protective coating -
PROCESSOR Xiaomi MI 9 Vivo X51 5G
Processor Type (CPU) Qualcomm Snapdragon 855 Qualcomm Snapdragon 765G
Clock Speed 2.84 GHz 2.4 GHz Xiaomi MI 9 has higher clock speed than Vivo X51 5G.
Processor Core Qty 8-core 8-core Both phones have the same number of phone cores.
64-bit Architecture Yes - Xiaomi MI 9 has 64-bit architecture.
Graphics System (GPU) Qualcomm ADRENO 640 -
MEMORY Xiaomi MI 9 Vivo X51 5G
RAM LPDDR4X SDRAM - 6 GB 8 GB Vivo X51 5G has more RAM than Xiaomi MI 9.
Internal Memory Size (Storage Capacity) 64 GB 256 GB Vivo X51 5G has more internal memory than Xiaomi MI 9.
CAMERA Xiaomi MI 9 Vivo X51 5G
MAIN CAMERA
Number of Main Cameras 3 4
Sensor Resolution 48 Megapixel 48 Megapixel Both phones have the same camera resolution.
Sensor Name Sony Exmor RS IMX586 sensor -
Lens Type Ultra wide-angle lens -
Lens Aperture F/1.75 F/1.6 Vivo X51 5G has better lens aperture than Xiaomi MI 9.
Pixel Size 0.8 μm -
Focus Adjustment Automatic Automatic
Laser Auto Focus Yes Yes
Optical Zoom 2x -
Digital Zoom 10x -
Special Effects HDR HDR
Camera Modes Burst mode, Panorama, portrait mode, AI Beautify, Smart ultra-wide angle mode, Ultra nightscape mode, Photo timer, Level display, Custom watermark, Full body portrait mode, Moon mode Panorama, Time-lapse mode, Pro mode, Live Photos, AI makeup, Portrait, Super Night mode, astro mode, pro sports mode, DOC mode
Face Recognition (Face ID) Face recognition - Xiaomi MI 9 has face detection.
Light Source Dual flash LED flash
Still Image Resolutions 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, 3840 x 2160 (4K) at 60 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, Slo-mo video 1920 x 1080 (1080p) at 960 fps, Slo-mo video 1280 x 720 (720p) at 960 fps -
Camera Features (Functions) Sapphire crystal lens cover, Phase Detect Auto-Focus (PDAF), Dynamic photos, video stabilisation, Contrast Auto-Focus, AI scene detection, AI studio lighting, Video Beautify, AI Triple camera, 960 fps Smart audio pairing, AI lens flare, AI high resolution photos, Portrait mode background blur adjustment, Ultra wide-angle edge distortion correction, Group photo face correction, Portrait mode background blurring, Motion tracking, Quick motion 60x Hyper Zoom, Gimbal Super Night Master, Gimbal Super Sport Expert
SECOND CAMERA
Sensor Resolution (2nd Camera) 12 Megapixel 13 Megapixel Vivo X51 5G has better second camera resolution than Xiaomi MI 9.
Lens Type (2nd Camera) Telephoto lens -
Lens Aperture (2nd Camera) F/2.2 F/2.46 Xiaomi MI 9 has better second camera lens aperture than Xiaomi MI 9.
Pixel Size (2nd Camera) 1 μm -
Camera Features (2nd Camera) Macro photography -
THIRD CAMERA
Sensor Resolution (3rd Camera) 16 Megapixel 8 Megapixel Xiaomi MI 9 has higher resolution third camera than Vivo X51 5G.
Lens Type (3rd Camera) Ultra wide-angle lens Wide-angle lens
Lens Aperture (3rd Camera) F/2.2 F/2.2 Both phones have the same lens aperture of the third camera.
Pixel Size (3rd Camera) 1 μm -
FOURTH CAMERA
Sensor Resolution (4th Camera) - 8 Megapixel
Lens Type (4th Camera) - Telephoto lens
Lens Aperture (4th Camera) - F/3.4
FRONT CAMERA
Number of Front Cameras 1 1
Sensor Resolution (Front) 20 Megapixel 32 Megapixel Vivo X51 5G has better front camera resolution than Xiaomi MI 9.
Lens Aperture (Front) F/2.0 F/2.45 Xiaomi MI 9 has better front lens aperture than Xiaomi MI 9.
Pixel Size (Front) 0.9 μm -
Special Effects (Front) HDR, Magic mirror HDR
Camera Modes (Front) AI portrait mode, AI Beautify, AI makeup Live Photos, Portrait
Face Recognition (Face ID) Face recognition - Xiaomi MI 9 has face detection.
Video Resolutions (Front) 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps -
Camera Features (Front) Self-timer, age recognition, Video Beautify, AI scene detection, AI studio lighting, Eye light, AI feature adjustment, AI lens flare 2 x digital zoom
BATTERY AND CHARGING Xiaomi MI 9 Vivo X51 5G
Battery Capacity (Battery Size) 3300 mAh 4315 mAh Vivo X51 5G has larger battery capacity than Xiaomi MI 9.
Fast Charging Technology Qualcomm Quick Charge 4.0+ - Xiaomi MI 9 has fast charging technology.
Wireless Charging Standards WPC, Qi -
CELLULAR Xiaomi MI 9 Vivo X51 5G
Technology CDMA2000 1X / GSM / WCDMA (UMTS) / TD-SCDMA CDMA2000 1X / GSM / WCDMA (UMTS)
Mobile Broadband Generation 4G 5G Vivo X51 5G has more advanced generation mobile network.
Operating System - Funtouch OS 10 (based on Android 10)
User Interface MIUI 10 -
Intelligent Assistant Google Assistant -
Payment Technology Android Pay -
Navigation GPS, A-GPS, GLONASS, BeiDou, Galileo GPS, GLONASS, BeiDou, Galileo
COMMUNICATIONS Xiaomi MI 9 Vivo X51 5G
Data Transmission GPRS, EDGE, EV-DO, HSDPA, HSUPA, HSPA+, VoLTE, FDD-LTE, TDD-LTE FDD-LTE, TDD-LTE, 5G NR FR1
2G Band - 850 GSM, 900 GSM, 1800 GSM, 1900 GSM, 800 CDMA2000 1X
3G UMTS Band Band 1, Band 2, Band 4, Band 5, Band 8 Band 1, Band 2, Band 4, Band 5, Band 8
3G UMTS Frequency 2100, 1900, 1700, 850, 900 2100, 1900, 1700, 850, 900
4G LTE Band Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 20, Band 28, Band 38, Band 39, 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 700a, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 1900, 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, n7, n8, n28, n38, n41, n77, n78
5G NR Frequency - FDD 2100, FDD 1800, FDD 2600, FDD 900, FDD 700APT, TDD TD 2600, TDD TD 2500, TDD TD 3700, TDD TD 3500
Wireless Interface IEEE 802.11a/b/g/n/ac Wi-Fi
Bluetooth Bluetooth 5.0 Bluetooth 5.1
NFC Yes Yes Both phones have an NFC reader for mobile payments.
WLAN Security WPA3 -
Messaging Services SMS, MMS -
MEDIA Xiaomi MI 9 Vivo X51 5G
Supported Digital Audio Standards WAV, AAC, AMR, MP3, FLAC, apt-X, LDAC, apt-X HD WAV, MPEG 2 Audio, MP3, FLAC, MIDI, APE (Monkey's Audio), AMR-WB, AMR-NB, Vorbis
Supported Digital Video Standards MKV, VC-1, XviD, MPEG-4, H.264, M4V, HEVC, VP8, VP9 MKV, AVI, 3GP, TS, MP4
Sound Enhancements Qualcomm TrueWireless Stereo Plus -
Audio Amplifier - AK4377A
FEATURES Xiaomi MI 9 Vivo X51 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, ambient light sensor, digital compass, gyro sensor, ultrasonic proximity sensor, linear rotation vector sensor Accelerometer, ambient light sensor, proximity sensor, digital compass
Security Devices Fingerprint reader (under display) Fingerprint reader
Additional Phone Features Infrared remote control, MIMO technology, MU-MIMO technology, MI Turbo, GAME Turbo -
OTHERS Xiaomi MI 9 Vivo X51 5G
Included Accessories Protective cover, SIM card removal tool, USB-C cable, USB-C audio adapter, 18W QC3.0 charger Headset, USB cable, power adapter, SIM card removal tool, USB-C to 3.5 jack adapter, protective case, protective film
Compliant Standards TUV Rheinland Certified Safe Fast-Charge System IP53
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