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Asus Zenfone 8 (128GB/6GB) vs Samsung Galaxy A51 5G (SM-A516U)

Side by side comparison between Asus Zenfone 8 vs Samsung Galaxy A51 5G phones, differences, pros, cons and full specifications. What's the better?

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Compare Samsung Galaxy A51 5G X Asus Zenfone 8 (128GB/6GB) 18Points
5.9"
AMOLED

1080x2400

64
MP

12mp

6GB
RAM

Octa-core

4000
mAh

(Non removable)

vs
06Points Samsung Galaxy A51 5G (SM-A516U) Compare Asus Zenfone 8 X
6.5"
AMOLED

1080x2400

48
MP

32mp

6GB
RAM

Octa-core

4500
mAh

(Non removable)

What's the better phone? Asus Zenfone 8 (128GB/6GB)

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

Zenfone 8 (128GB/6GB)} 18 Advantages Asus Zenfone 8 (128GB/6GB) vs Galaxy A51 5G (SM-A516U)} 6 Advantages Samsung Galaxy A51 5G (SM-A516U)
+2.84GHz 64bit Octa-core (5nm)41%
More powerful processor, you can open your applications faster
vs2.2GHz 64bit Octa-core (8nm)
+6GB LPDDR5Advantage
This RAM type is better and more efficient.
vs6GB LPDDR4X
+UFS 3.1Advantage
Fastest write and read storage.
vsUFS 2.1
+169 grams (5.92 ounces)11%
Lighter
vs187 grams (6.55 ounces)
+HDR10+Advantage
The HDR10+ display provides vibrant colors and more details
vsNot supported
+120Hz100%
The display reproduces more frames per second because the frequency (Hertz) is higher, improves fluidity and tires your eyes less.
vs60Hz
+446 PPI10%
Crisper display of text, images and videos because it has more pixels per inch (ppi)
vs405 PPI
+(dual camera) 64MP + 12MP9%
Higher resolution main camera
vs(quad camera) 48MP + 12MP + 5MP + 5MP
+OIS (4-axis): Optical stabilizationAdvantage
Image stabilization prevents blurry photos and helps in recording motion video
vsEIS: Digital stabilization
+1/1.73" inches16%
The larger sensor camera lets you take photos with better depth.
vs1/2" inches
+f/1.8 (aperture)11%
Diaphragm opening (Aperture) of the camera which has the smallest F number takes photos with better light exposure.
vsf/2.0 (aperture)
+8K UHD (7680x4320)3 times
More image quality for recording videos with the primary camera
vs4K UHD (3840x2160)
+Proximity sensorAdvantage
Sensors help you use the device
vsVirtual proximity sensor
+30W100%
More power (watts) to charge the battery faster. Sometimes, the charger that comes with the device doesn't have the same power supported by the device. Check before you buy it.
vs15W
+2 slots (Dual-SIM)Advantage
You can have more mobile carriers/operators on the same device.
vs1 slot (Single-SIM)
(dedicated slot)
+802.11 a/b/g/n/ac/ax [wifi6E/6]Advantage
WiFi 802.11 a/b/g/n/ac/ax [wifi6E/6] is newer and faster
vs802.11 a/b/g/n/ac [wifi5]
+5.2 + A2DP/LEAdvantage
Bluetooth 5.2 + A2DP/LE is newer and faster
vs5.0 + A2DP/LE
+IP68 certifiedAdvantage
Protection against water allows you talk to your friends in the rain, for example
vsNot supported
Not supportedvs+Until 1TB microSD, microSDXCAdvantage
More external storage for files using memory cards
8.9 millimeters (0.35 inches)vs+8.7 millimeters (0.34 inches)2%
Thinner
5.9"vs+6.5"10%
Larger screen
(front) 12MPvs+(front) 32MP166%
Higher resolution secondary camera to take pictures and selfies
Not supportedvs+ANT+Advantage
Sensors help you use the device
4000 mAhvs+4500 mAh13%
Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use

29 Common items in both devices
128GB (107GB available) / 128GB (105GB available)
Aluminum frame, glass front/back / Aluminum body, glass front, plastic back
Super AMOLED
16 million
1080x2400 pixels
LED flash
Only digital zoom
+22 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differences Clear highlight

📱 Model features

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
ModelZenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
Other model namesAsus Zenfone 8 (ZS590KS, ZS590KS-2A007EU)Galaxy A51 SM-A516UZKAXAA (Unlocked)
Country or region available(Global, International)
(Global, International)
USA
USA
BrandAsusSamsung
Release date5/13/2021, Announced: 5/12/20214/29/2020, Announced: 4/8/2020
Depth8.9 millimeters (0.35 inches)8.7 millimeters (0.34 inches)
Size (width x height)68.5 x 148 millimeters (2.7 x 5.83 in)73.6 x 158.9 millimeters (2.9 x 6.26 in)
Weight169 grams (5.92 ounces)187 grams (6.55 ounces)
Build, materialsAluminum frame, glass front/backAluminum body, glass front, plastic back
Protection against water and othersIP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistantNot supported

📲 Display

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
Display typeSuper AMOLEDSuper AMOLED
Screen size5.9" inches6.5" inches
Screen-to-body ratio~82.9% (screen-to-body ratio)~87.2% (screen-to-body ratio)
Display resolution1080x2400 pixels (20:9)1080x2400 pixels (20:9)
TouchscreenCapacitive Multitouch 10-pointsCapacitive Multitouch
Pixel density (dot pitch)446 PPI405 PPI
Colors16 million16 million
Scratch-resistant glassGorilla Glass VictusGorilla Glass 3
Refresh rate120Hz60Hz
Display features700nits[typ], 1100nits[peak]
HDR10+
Always-On Display
Always-On Display

🤖 Operating System

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
System versionAndroid 11Android 10
Firmware updateAndroid 13Android 13
User InterfaceZenUI 8 / 9 / 10One UI 2.5 / 3.1 / 4.1 / 5.0

⚙️ Processor

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
Chipset64bit: Qualcomm Snapdragon 888 (SM8350) (5nm)64bit: Samsung Exynos 980 (8nm)
CPUOcta-core, 3 processors:
1x 2.84GHz Kryo 680 (Single-core)
3x 2.42GHz Kryo 680 (Triple-core)
4x 1.8GHz Kryo 680 (Quad-core)
Octa-core, 2 processors:
2x 2.2GHz ARM Cortex-A77 (Dual-core)
6x 1.8GHz ARM Cortex-A55 (Hexa-core)
GPU graphical controllerQualcomm Adreno 660 (840MHz)ARM Mali-G76 MP5 (728MHz)
Performance (benchmark)AnTuTu: 676001 (v8), 799738 (v9)
Geekbench: 3604 (v5.1)
GFXBench: 61fps (ES 3.1 onscreen)
AnTuTu: 316007 (v8)
Geekbench: 1867(v5.1)
GFXBench: 17fps (ES 3.1 onscreen)

💽 Memory and storage

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
RAM memory6GB LPDDR56GB LPDDR4X
Internal storage128GB (107GB available)
UFS 3.1
128GB (105GB available)
UFS 2.1
External storageNot supportedUntil 1TB microSD, microSDXC
(dedicated slot)

📶 Mobile networks

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
Dual-SIMDual-SIM Standby - Call active on one sim cardNot supported
SIM card2 slots (Dual-SIM)
nano-SIM (4FF)
1 slot (Single-SIM)
nano-SIM (4FF)
Maximum Download / Upload2000/1024 Mbps2000/200 Mbps
Network technology2G, 3G, 4G, 5G2G, 3G, 4G, 5G
Frequency, bands Expand band details Collapse details
GSM MHz bandQuad-Band 850/900/1800/1900Quad-Band 850/900/1800/1900
Primary 2G networkGSM 850/900/1800/1900GSM 850/900/1800/1900
Primary 3G networkUMTS 800/850/900/1700/1900/2100UMTS 850/900/1700/1900/2100
Primary 4G networkLTE Cat20
VoLTE
America version:
LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 30, 66, 71)
TD-LTE (34, 38, 39, 40, 41, 42)
Global version:
LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28)
TD-LTE (34, 38, 39, 40, 41, 42)
LTE Cat12/13 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 26, 28, 66)
TD-LTE (38, 40, 41)
VoLTE
Primary 5G networkAmerica version:
SA/NSA (1, 2, 3, 5, 7, 8, 12, 20, 25, 38, 40, 66, 71, 77, 78)
Global version:
SA/NSA (1, 2, 3, 5, 7, 8, 12, 20, 28, 38, 77, 78)
SA/NSA/Sub6 (41, 78)
Primary data networkGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSAGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
Secondary 2G networkGSM 850/900/1800/1900Not supported
Secondary 3G networkUMTS 800/850/900/1700/1900/2100Not supported
Secondary 4G networkLTE Cat20
VoLTE
America version:
LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 30, 66, 71)
TD-LTE (34, 38, 39, 40, 41, 42)
Global version:
LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28)
TD-LTE (34, 38, 39, 40, 41, 42)
Not supported
Secondary data networkGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-ANot supported

📷 Camera

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
Back camera (main camera)(dual camera)
64 megapixels
12MP ultrawide f/2.2112°14mm1/2.55"1.4µmPDAF
(quad camera)
48 megapixels
12MP ultrawide f/2.213mm1.12µm
5MP telephoto f/2.440mm
5MP depth f/2.21/5.0"1.12µm
Main camera resolution10120x6328 pixels8000x6000 pixels
Video recording (primary)8K UHD (7680x4320) 24 fps4K UHD (3840x2160) 30 fps
FlashLED flashLED flash
Focal aperturef/1.8 (aperture)f/2.0 (aperture)
Focal length26mm lens26mm lens
Sensor size1/1.73" inches1/2" inches
Pixel size0.8µm pixel0.8µm pixel
AutofocusPDAF: phase detection autofocusPDAF: phase detection autofocus
Touch focusSupportedSupported
Image stabilizationOIS (4-axis): Optical stabilizationEIS: Digital stabilization
ZoomOnly digital zoomOnly digital zoom
Face/smile detectionFace detection, Smile detectionFace detection, Smile detection
BSI sensorSupportedNot supported
HDRHDR photo/video on both camerasHDR photo on both cameras
Camera extras4K@120fps
1080p@240fps
720p@480fps
feature not registered

📸 Front camera

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
Front camera (secondary)12 megapixels32 megapixels
Front camera resolution4000x3000 pixels6528x4896 pixels
Video recording (secondary)4K UHD (3840x2160)4K UHD (3840x2160)
Front flashNot supportedNot supported
Focal aperturef/2.5 (aperture)f/2.2 (aperture)
Focal length28mm lens26mm lens
Sensor size1/2.93" inches1/2.8" inches
Pixel size1.22µm pixel0.8µm pixel

🔉 Sound and multimedia

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
LoudspeakerStereo sound
32-bit/384kHz
Supported
Active noise cancellation2 microphones or more2 microphones or more
RadioFMFM (RDS)
TVNot supportedNot supported
Video formatsMP4, H.265, H.264, H.263, XviD, MKVMP4, H.265, H.264, H.263, XviD, MKV
Audio formatsMP3, WAV, WMA, eAAC+, FLACMP3, WAV, WMA, eAAC+, FLAC

🔌 Connectivity

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
USBUSB 2.0 Type-C, USB OTG On-The-GoUSB 2.0 Type-C, USB OTG On-The-Go
Audio output3.5mm jack3.5mm jack
TV outputUSB Type-C (reversible)Not supported
Bluetooth5.2 + A2DP/LE5.0 + A2DP/LE
WiFi802.11 a/b/g/n/ac/ax [wifi6E/6] (2.4GHz, 5GHz, 6GHz) + MIMO
WiFi Direct, hotspot
802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO
WiFi Direct, hotspot
DLNANot supportedNot supported
GPSA-GPS, GeoTagging, GLONASS, GALILEO, BeiDou, QZSS, NavICA-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFCSupportedSupported
Infrared portNot supportedNot supported

🧭 Sensors

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
SensorsAccelerometer
Ambient light sensor
Compass
Face unlock
Fingerprint sensor (under display)
Gyroscope
Hall effect
Proximity sensor
Accelerometer
Ambient light sensor
ANT+
Compass
Face unlock
Fingerprint sensor (under display)
Gyroscope
Hall effect
Virtual proximity sensor
Vibrating alertSupportedSupported

🔋 Battery

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
Battery typeLiPo: li-ion polymer (Non removable)LiPo: li-ion polymer (Non removable)
Battery capacity4000 mAh4500 mAh
Charger, watts30W Wired fast charging
5W Reverse charging by cable
Quick Charge 4
USB Power Delivery 3.0
15W Wired fast charging
Inductive / wireless chargingNot supportedNot supported
Talk time autonomyfeature not registeredfeature not registered
Standbyfeature not registeredfeature not registered

➕ Other features

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
Call controlVoice dialing, Voice recorder, Voice commandsVoice dialing, Voice recorder
MessagingSMS (T9), MMS, E-mail, Push mailSMS (T9), MMS, E-mail, Push mail
Hands-free callingSupportedSupported
Video callingSupportedSupported
RingtonesPolyphonic and customizedPolyphonic and customized
Web browserHTML, XHTML, HTML5HTML, XHTML, HTML5
AntennaInternal antennaInternal antenna
Qwerty physical keyboardNot supportedNot supported
Miscellaneous• Colors: Obsidian Black, Horizon Silver• Colors: Prism Cube Black, Prism Cube White, Prism Cube Pink

☢️ Radiation rate

Asus Zenfone 8 (128GB/6GB)Galaxy A51 5G (SM-A516U)
SAR 1.6W/kg (USA, Mexico, etc.)feature not registered1.18W/kg (head), 1.2W/kg (body)
SAR 2W/kg (Europe, UK, etc.)feature not registeredfeature not registered
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