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Samsung Galaxy A51 vs Xiaomi Redmi 3x

Compare recorded specifications, size and practical differences.

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    Key differences

    Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

    • Display technology

      OLED versus LCD

      Galaxy A51:
      OLED
      Redmi 3x:
      LCD

    • Weight

      Redmi 3x: 28 g lighter

      Galaxy A51:
      172 g
      Redmi 3x:
      144 g

    • Width

      Redmi 3x: 4 mm narrower

      Galaxy A51:
      73.6 mm
      Redmi 3x:
      69.6 mm

    • Screen diagonal

      Redmi 3x: 1.5 in smaller diagonal

      Galaxy A51:
      6.5 in
      Redmi 3x:
      5 in

    • Chipset

      Galaxy A51:
      Exynos 9611 (10nm)
      Redmi 3x:
      Qualcomm MSM8937 Snapdragon 430 (28 nm)

    • Rear camera layout

      Galaxy A51:
      Quad
      Redmi 3x:
      Single

    Physical size

    Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

    1. 1. Galaxy A51

      Height:
      158.5 mm +19.2 mm versus Redmi 3x
      Width:
      73.6 mm +4 mm versus Redmi 3x
      Depth:
      7.9 mm

    2. 2. Redmi 3x

      Height:
      139.3 mm
      Width:
      69.6 mm
      Depth:
      8.5 mm +0.6 mm versus Galaxy A51

    Weight

    Bars start at zero and share a scale within this chart.

    1. 1. Galaxy A51

      172 g

      +28 g versus Redmi 3x

    2. 2. Redmi 3x

      144 g

    Screen size

    Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

    1. 1. Galaxy A51

      Screen diagonal:
      6.5 in
      Aspect ratio (height:width):
      20:9
      Approximate rectangular screen area:
      102 cm²

    2. 2. Redmi 3x

      Screen diagonal:
      5 in
      Aspect ratio (height:width):
      16:9
      Approximate rectangular screen area:
      68.9 cm²

    Galaxy A51 has approximately 48% more rectangular screen area than Redmi 3x.

    Memory variants

    Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

    Recorded RAM for Galaxy A51, Redmi 3x, compared at the same storage capacity.
    StorageGalaxy A51Redmi 3x
    32 GB Not recorded 2 GB RAM
    64 GB 4 GB RAM Not recorded
    128 GB 4 / 6 / 8 GB RAM Alternative RAM configurations Not recorded

    Practical features

    Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

    1. Galaxy A51

    NFC:
    Yes
    Headphone jack:
    Yes
    Memory card support:
    See details microSD · up to 1 TB (dedicated slot)

    2. Redmi 3x

    NFC:
    Unknown
    Headphone jack:
    Yes
    Memory card support:
    See details microSD · up to 256 GB (uses SIM 2 slot)

    Battery capacity

    Capacity is not battery life. No endurance test is implied.

    Recorded battery capacity

    Bars start at zero and share a scale within this chart.

    1. 1. Galaxy A51

      4000 mAh

    2. 2. Redmi 3x

      4100 mAh

      +100 mAh versus Galaxy A51

    Specifications

    Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.

    1. Galaxy A512. Redmi 3x

    Everyday essentials
    Everyday essentials — specifications for Galaxy A51, Redmi 3x.
    SpecificationGalaxy A51Redmi 3x
    Dimensions (HxWxD)
    • 158.5 Х 73.6 Х 7.9 mm
    • 139.3 Х 69.6 Х 8.5 mm
    Weight
    • 172 g
    • 144 g
    Technology
    • Super AMOLED
    • IPS LCD
    Screen size
    • 6.5" inch
    • 5" inch
    Screen resolution
    • 1080 x 2400 px
    • 720 x 1280 px
    Internal memory Recorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.
    • 64GB 4GB RAM
    • 128GB 4GB RAM
    • 128GB 6GB RAM
    • 128GB 8GB RAM
    • 32 GB
    • 2 GB RAM
    Memory card support
    • microSD
    • up to 1 TB (dedicated slot)
    • microSD
    • up to 256 GB (uses SIM 2 slot)
    Battery Capacity is not battery life. No endurance test is implied.
    • 4000 mAh
    • Non-removable Li-Po
    • 4100 mAh
    • Non-removable Li-Ion
    Operating system OS
    • Android 10.0; One UI 2
    • Android 6.0.1 (Marshmallow); MIUI 7.3
    Chipset
    • Exynos 9611 (10nm)
    • Qualcomm MSM8937 Snapdragon 430 (28 nm)
    NFC
    • Yes
    		 Unknown
    Headphone jack
    • Yes
    • Yes
    Display
    Display — specifications for Galaxy A51, Redmi 3x.
    SpecificationGalaxy A51Redmi 3x
    Touchscreen
    • capacitive touchscreen
    • capacitive touchscreen
    Display colors
    • 16M
    • 16M
    Screen area
    • 102.0 cm2
    • 68.9 cm2
    Screen format
    • 20:9 (height:width)
    • 16:9 (height:width)
    Screen to body ratio
    • 87.4%
    • 71.1%
    PPI /points per inch/
    • 405 PPI
    • 294 PPI
    Screen protection
    • Corning Gorilla Glass 3
    		 Unknown
    Camera and Video
    Camera and Video — specifications for Galaxy A51, Redmi 3x.
    SpecificationGalaxy A51Redmi 3x
    Rear camera, main
    • 48 MP
    • Quad
    • 13 MP
    • Single
    Camera specs
    • 48 MP
    • f/2.0
    • 26mm (wide)
    • 1/2.0"
    • 0.8µm
    • PDAF -12 MP
    • f/2.2
    • 12mm (ultrawide) -5 MP
    • f/2.4
    • 25mm (macro)
    • 1/5.0"
    • 1.12µm -5 MP
    • 1.12µm
    • depth sensor
    • 13 MP
    • PDAF
    • f/2.0
    Functions
    • HDR
    • LED flash
    • HDR
    • panorama
    Video
    • 1080p@30fps
    • 1080p@30fps
    Front camera, selfie
    • 32 MP
    • Single
    • 5 MP
    • Single
    Specifications
    • 32 MP
    • f/2.2
    • 26mm (wide)
    • 1/2.8"
    • 0.8µm
    • 5 MP
    • f/2.2
    Performance

    Scores marked * are historical catalogue entries. Test conditions are unspecified; no new testing is implied.

    Performance — specifications for Galaxy A51, Redmi 3x.
    SpecificationGalaxy A51Redmi 3x
    Processor CPU
    • Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53)
    • Octa-core 1.4 GHz Cortex-A53
    Graphics processor GPU
    • Mali-G72 MP3
    • Adreno 505
    Antutu 7 score *
    • 155326
    • 35195
    GeekBench 4 Single Core * Unknown
    • 632
    GeekBench 4 Multi-Core * Unknown
    • 1774
    GeekBench 4 RenderScript * Unknown
    • 1822
    Antutu 8 score *
    • 186846
    		 Unknown
    GeekBench 5 Single Core *
    • 322
    		 Unknown
    GeekBench 5 Multi-Core *
    • 1212
    		 Unknown
    General specs
    General specs — specifications for Galaxy A51, Redmi 3x.
    SpecificationGalaxy A51Redmi 3x
    Release date
    • 2019
    • December
    • 2016
    • June
    Colors
    • Prism Crush Black
    • White
    • Blue
    • Pink
    • Gold
    • Dark Gray
    • Silver
    Historical recorded price Legacy catalogue value; date unknown. Not a current offer.
    • $280
    • 170 EUR
    Battery life
    • Talking time- Up to 32 h (3G) Music play - Up to 87 h
    		 Unknown
    Body build
    • Glass front (Gorilla Glass 3)
    • plastic back
    • plastic frame
    • aluminum body
    • plastic ends
    Communication and Connectivity
    Communication and Connectivity — specifications for Galaxy A51, Redmi 3x.
    SpecificationGalaxy A51Redmi 3x
    SIM card
    • Single SIM (Nano-SIM)Dual SIM (Nano-SIM
    • dual stand-by)
    • Hybrid Dual SIM (Micro-SIM/Nano-SIM
    • dual stand-by)
    Network
    • Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) -3G - HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 -4G - LTE (unspecified)
    • Show all network frequencies: -2G - GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA 800 / 1900 -3G - HSDPA 850 / 900 / 1900 / 2100 TD-SCDMA CDMA2000 1xEV-DO -4G - LTE band 1(2100)
    • 3(1800)
    • 7(2600)
    • 38(2600)
    • 39(1900)
    • 40(2300)
    • 41(2500)
    Speed
    • HSPA
    • LTE-A
    • HSPA
    • LTE
    • EV-DO Rev.A 3.1 Mbps
    GPRS
    • Yes
    • Yes
    Edge
    • Yes
    • Yes
    Wi-Fi
    • Wi-Fi 802.11 a/b/g/n/ac
    • dual-band
    • Wi-Fi Direct
    • hotspot
    • Wi-Fi 802.11 b/g/n
    • Wi-Fi Direct
    • hotspot
    GPS
    • Yes
    • with A-GPS
    • GLONASS
    • GALILEO
    • BDS
    • Yes
    • with A-GPS
    • GLONASS
    • BDS
    USB
    • 2.0
    • Type-C 1.0 reversible connector
    • USB On-The-Go
    • microUSB 2.0
    Bluetooth
    • 5.0
    • A2DP
    • LE
    • 4.1
    • A2DP
    Harmful irradiation
    • SAR - 0.80 W/kg (head) 0.67 W/kg (body) SAR EU - 0.37 W/kg (head) 1.59 W/kg (body)
    		 Unknown
    Music and Audio
    Music and Audio — specifications for Galaxy A51, Redmi 3x.
    SpecificationGalaxy A51Redmi 3x
    Radio
    • FM radio
    • FM radio
    Others
    • Active noise cancellation with dedicated mic
    • Active noise cancellation with dedicated mic
    Other features
    Other features — specifications for Galaxy A51, Redmi 3x.
    SpecificationGalaxy A51Redmi 3x
    Dop
    • Sensors Fingerprint (under display
    • optical)
    • accelerometer
    • gyro
    • proximity
    • compass - ANT+ - Fast battery charging 15W - Versions: SM-A515F/DSN (Global); SM-A515F/DS (LATAM); SM-A515F/DST (Brazil); SM-A515F/DSM (Russia); SM-A515F/N (Australia)
    • Sensors Fingerprint (rear-mounted)
    • accelerometer
    • gyro
    • proximity
    • compass
    • Infrared port - Fast battery charging

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