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Samsung Galaxy J7 vs Samsung Galaxy M51

 
Brief information about compared phones: Samsung Galaxy M51 , Samsung Galaxy J7

Samsung Galaxy M51 2020 year of release, cpu - Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver), screen 6.7", with resolution 1080x2400. Smartphone has 32 megapixel front camera and 64 megapixel main camera.

Samsung Galaxy J7 2015 year of release, cpu Octa-core (4x1.4 GHz Cortex-A53 & 4x1.0 GHz Cortex-A53) -Octa-core 1.5 GHz Cortex-A53, screen 5.5", with resolution 720x1280. Smartphone has 5 megapixel front camera and 13 megapixel main camera.

Display Technology Super AMOLED Plus Super AMOLED
Touchscreen capacitive touchscreen capacitive touchscreen
Display colors 16M 16M
Screen size 6.7" inc 5.5" inch
Screen area 108.4 cm2 83.4 cm2
Screen format 20:9 (height:width) 16:9 (height:width)
Screen to body ratio 86.7% 69.6%
Screen resolution 1080 x 2400 px 720 x 1280 px
PPI /points per inch/ 267 PPI
Screen protection Corning Gorilla Glass 3
Camera and Video Rear camera, main 64 MP, Quad 13 MP, Single
Camera specs -64 MP, f/1.8, 26mm (wide), 1/1.73", 0.8µm, PDAF -12 MP, f/2.2, 123˚ (ultrawide) -5 MP, f/2.4, (macro) -5 MP, (depth) 13 MP, f/1.9, 28mm (wide), AF
Functions HDR LED flash
Video 1080p@30fps 1080p@30fps
Front camera, selfie 32 MP, Single 5 MP, Single
Specifications 32 MP, f/2.0, 26mm (wide), 1/2.8'', 0.8µm 5 MP, f/2.2, 23mm (wide)
Performance Operating system OS Android 10, One UI 2.0 Android 5.1 (Lollipop), upgradable to 6.0.1 (Marshmallow)
Chipset - Qualcomm SDM730 Snapdragon 730G (8 nm) Qualcomm MSM8939 Snapdragon 615 (28 nm) -Exynos 7580 Octa
Processor CPU - Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver) Octa-core (4x1.4 GHz Cortex-A53 & 4x1.0 GHz Cortex-A53) -Octa-core 1.5 GHz Cortex-A53
Graphics processor GPU - Adreno 618 Adreno 405 -Mali-T720MP2
External memory microSDXC (dedicated slot) microSD, up to 256 GB (dedicated slot)
Internal memory 128GB 6GB RAM, 128GB 8GB RAM 16 GB, 1.5 GB RAM
GeekBench 4 Single Core 693
GeekBench 4 Multi-Core 3327
GeekBench 4 RenderScript 1997
Antutu 8 score 272774
General specs Release date 2020, August 31 2015, June
Dimensions (HxWxD) 163.9 Х 76.3 Х 9.5 mm 152.2 Х 78.7 Х 7.5 mm
Weight 213 g 171 g
Colors Celestial Black, Electric Blue White, Black, Gold
Battery 7000 mAh, Li-Po, non-removable 3000 mAh,  Removable Li-Ion
Approximate price 360 EUR 200 EUR
Battery life Talking time- Up to 18 h (3G) Music play - Up to 76 h
Body build Glass front (Gorilla Glass 3), plastic back, plastic frame plastic body
Communication and Connectivity SIM card Dual SIM (Nano-SIM, dual stand-by) Single SIM (Micro-SIM)Dual SIM (Micro-SIM, dual stand-by)
Network Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 -3G - HSDPA 850 / 900 / 1900 / 2100 -4G - LTE Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) -3G - HSDPA 850 / 900 / 1900 / 2100 -4G - LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 40(2300)
Speed HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 400/50 Mbps HSPA 21.1/5.76 MbpsHSPA, LTE Cat4 150/50 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
NFC Yes Yes (Snapdragon model only)
USB 2.0, Type-C 1.0 reversible connector microUSB 2.0
Bluetooth 5.0, A2DP, LE 4.1, A2DP
Harmful irradiation SAR - 1.38 W/kg (head) SAR EU - 0.61 W/kg (head)     1.45 W/kg (body)     SAR - 1.25 W/kg (head)     1.36 W/kg (body)     SAR EU - 0.50 W/kg (head)     0.37 W/kg (body)    
Music and Audio Radio FM radio FM radio, RDS, recording
Headphone jack Yes Yes
Other features Dop - Sensors - Fingerprint (side-mounted), accelerometer, gyro, proximity, compass - Fast charging 25W, 100% in 115 min -Reverse charging - Versions: SM-M515F/DSN (international) Sensors Accelerometer, proximity - ANT+ - Versions: J700F (India, Thailand); J700M (LATAM); J700M/DS (Brazil); J700H with no LTE (South Africa, Pakistan, Vietnam, Philippines, Russia); J700T (T-Mobile, Metro PCS); J700P (Virgin Mobile, Boost)

An overview of the main advantages of each of the devices

Reasons to buy Galaxy M51
  • Screen 6.7"
  • Front camera 32 MP
  • Main camera 64 MP
  • Internal memory 128 GB
  • External memory microSDXC (dedicated slot) GB
  • RAM 8 GB
Reasons to buy Galaxy J7
  • Screen 5.5"
  • External memory microSD GB