vivo S2 FE vs vivo Y51 (2020, September): Which is better?

Screen size

S2 FE6.8"+6.6%

Y51 (2020, September)6.4"

Technology

S2 FE

GSM / HSPA / LTE / 5G

Y51 (2020, September)

GSM / HSPA / LTE

2G bands

S2 FE

GSM 850 / 900 / 1800 / 1900

Y51 (2020, September)

GSM 850 / 900 / 1800 / 1900

3G bands

S2 FE

HSDPA 800 / 850 / 900 / 2100

Y51 (2020, September)

HSDPA 850 / 900 / 2100

4G bands

S2 FE

1, 3, 4, 5, 8, 19, 28, 38, 40, 41, 42, 43, 48, 66

Resolution

S2 FE1,260 × 2,800 px+28%

Y51 (2020, September)1080 × 2340 px

Refresh rate

S2 FE120 Hz

Y51 (2020, September)—

Peak brightness

S2 FE2,000 nits

Y51 (2020, September)—

Pixel density

S2 FE450 ppi+10%

Y51 (2020, September)404 ppi

CPU speed

S2 FEOcta-core (4x2.5 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55)+20%

Y51 (2020, September)Octa-core (4x2.0 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)

RAM

S2 FE6.0 GB+33%

Y51 (2020, September)4.0 GB

Storage

equal specs

S2 FE128 GB

Y51 (2020, September)128 GB

Main camera

S2 FE50.0 MP+4%

Y51 (2020, September)48.0 MP

Front camera

S2 FE32.0 MP+50%

Y51 (2020, September)16.0 MP

Battery

S2 FE10,000 mAh+55%

Y51 (2020, September)4,500 mAh

Wired charging

S2 FE44 W+59%

Y51 (2020, September)18 W

Weight

S2 FE224 g

Y51 (2020, September)186 g+20%

Thickness

S2 FE8.6 mm+1.2%

Y51 (2020, September)8.7 mm

IP rating

S2 FEIP69/IP68

Y51 (2020, September)—

Wi‑Fi

S2 FEYes

Y51 (2020, September)Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct

Bluetooth

equal specs

S2 FE5

Y51 (2020, September)5.0, A2DP, LE

USB

equal specs

S2 FE2.0

Y51 (2020, September)USB Type-C 2.0, OTG

5G support

S2 FEYes+100%

Y51 (2020, September)No

NFC

equal specs

S2 FENo

Y51 (2020, September)No

3.5mm jack

S2 FENo

Y51 (2020, September)Yes+100%

SD card

S2 FENo

Y51 (2020, September)Yes+100%

Stereo speakers

S2 FEYes

Y51 (2020, September)—

5G bands

S2 FE

1, 3, 5, 8, 28, 38, 40, 41, 48, 66, 77, 78 SA/NSA

Y51 (2020, September)

Speed

S2 FE

HSPA, LTE, 5G

Y51 (2020, September)

HSPA, LTE

Announced

S2 FE

2026, October 06

Y51 (2020, September)

2020, September 15. Released 2020, September 19

Status

S2 FE

Released Oct 20, 2026

Y51 (2020, September)

Discontinued

Dimensions

S2 FE

163.9 x 76.5 x 8.6 mm (6.45 x 3.01 x 0.34 in)

Y51 (2020, September)

159.3 x 75.2 x 8.7 mm (6.27 x 2.96 x 0.34 in)

Weight

S2 FE

224 g (7.90 oz)

Y51 (2020, September)

186.7 g (6.60 oz)

Build

S2 FE

Glass front, plastic frame, plastic back

Y51 (2020, September)

SIM

S2 FE

Nano-SIM + Nano-SIM

Y51 (2020, September)

Nano-SIM + Nano-SIM

Other

S2 FE

IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) MIL-STD-810H compliant* * does not guarantee ruggedness or use in extreme conditions

Y51 (2020, September)

Type

S2 FE

AMOLED, 1B colors, 120Hz, HDR10+, 1000 nits, 2000 nits (HBM)

Y51 (2020, September)

Super AMOLED

Size

S2 FE

6.83 inches, 112.6 cm2 (~89.8% screen-to-body ratio)

Y51 (2020, September)

6.38 inches, 99.9 cm2 (~83.4% screen-to-body ratio)

Resolution

S2 FE

1260 x 2800 pixels, 20:9 ratio (~450 ppi density)

Y51 (2020, September)

1080 x 2340 pixels, 19.5:9 ratio (~404 ppi density)

S2 FE

Android 16, OriginOS 6

Y51 (2020, September)

Android 10, Funtouch 10

Chipset

S2 FE

Mediatek Dimensity 7300e (6 nm)

Y51 (2020, September)

Qualcomm SDM665 Snapdragon 665 (11 nm)

CPU

S2 FE

Octa-core (4x2.5 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55)

Y51 (2020, September)

Octa-core (4x2.0 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)

GPU

S2 FE

Mali-G610

Y51 (2020, September)

Adreno 610

Card slot

S2 FE

Y51 (2020, September)

microSDXC (uses shared SIM slot)

Internal

S2 FE

128GB 6GB RAM, 128GB 8GB RAM

Y51 (2020, September)

128GB 4GB RAM

Other

S2 FE

UFS 3.1

Y51 (2020, September)

Dual

S2 FE

50 MP, f/1.8, (wide), 1/2.93", PDAF Auxiliary lens

Y51 (2020, September)

Features

S2 FE

LED flash, HDR, panorama

Y51 (2020, September)

LED flash, HDR, panorama

Video

S2 FE

Yes

Y51 (2020, September)

1080p@30fps, gyro-EIS

Quad

S2 FE

Y51 (2020, September)

48 MP, f/1.8, (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.2, 120˚, (ultrawide), 1/4.0", 1.12µm 2 MP (macro) Auxiliary lens

Single

S2 FE

32 MP, f/2.0, 22mm (wide)

Y51 (2020, September)

16 MP, f/2.0, (wide), 1/3.06" 1.0µm

Video

S2 FE

1080p@30fps

Y51 (2020, September)

1080p@30fps

Features

S2 FE

Y51 (2020, September)

HDR

Loudspeaker

S2 FE

Yes, with stereo speakers

Y51 (2020, September)

Yes

3.5mm jack

S2 FE

Y51 (2020, September)

Yes

WLAN

S2 FE

Yes

Y51 (2020, September)

Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct

Bluetooth

S2 FE

5.4, A2DP, LE

Y51 (2020, September)

5.0, A2DP, LE

Positioning

S2 FE

GPS, GALILEO, GLONASS, QZSS, BDS

Y51 (2020, September)

GPS, GLONASS, GALILEO, BDS

NFC

S2 FE

Y51 (2020, September)

Radio

S2 FE

Y51 (2020, September)

FM radio

USB

S2 FE

USB Type-C 2.0, OTG

Y51 (2020, September)

USB Type-C 2.0, OTG

Sensors

S2 FE

Fingerprint (under display, optical), accelerometer, gyro, proximity, compass

Y51 (2020, September)

Fingerprint (under display, optical), accelerometer, gyro, proximity, compass

Type

S2 FE

Si/C Li-Ion 10000 mAh

Y51 (2020, September)

4500 mAh

Charging

S2 FE

44W wired Reverse wired

Y51 (2020, September)

18W wired

Colors

S2 FE

Stellar Green, Zen White, Titan Black

Y51 (2020, September)

Mystic Black, Jazzy Blue, Dreamy White

SAR

S2 FE

1.14 W/kg (head) 1.00 W/kg (body)

Y51 (2020, September)

Price

S2 FE

About 360 EUR

Y51 (2020, September)

About 180 EUR

S2 FE vs Y51 (2020, September)

Which is better?

Choose S2 FE for

Choose Y51 (2020, September) for

Biggest differences

S2 FE

Y51 (2020, September)

Head-to-head comparison

Display

Specifications Comparison

Network

Performance

Cameras

Battery

Build

Connectivity

Display

Performance

Cameras

Battery

Build

Connectivity

Launch

Body

Display

Platform

Memory

Main Camera

Selfie camera

Sound

Comms

Features

Battery

Misc