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Samsung Galaxy S21 Ultra (SM-G998B 128GB) vs Samsung Galaxy S8 (SM-G950U)

Side by side comparison between Samsung Galaxy S21 Ultra vs Samsung Galaxy S8 phones, differences, pros, cons and full specifications. What's the better?

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Compare Samsung Galaxy S8 XSamsung Galaxy S21 Ultra (SM-G998B 128GB)23Points
Samsung Galaxy S21 Ultra (SM-G998B 128GB)
6.8"
AMOLED

1440x3200

108
MP

40mp

12GB
RAM

64bit Octa

5000
mAh

(Non removable)

vs
09PointsSamsung Galaxy S8 (SM-G950U)Compare Samsung Galaxy S21 Ultra X
Samsung Galaxy S8 (SM-G950U)
5.8"
AMOLED

1440x2960

12.2
MP

8mp

4GB
RAM

64bit Octa

3000
mAh

(Non removable)

What's the better phone? Samsung Galaxy S21 Ultra (SM-G998B 128GB)

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!

Galaxy S21 Ultra (SM-G998B 128GB)23 Advantages Samsung Galaxy S21 Ultra (SM-G998B 128GB)vsGalaxy S8 (SM-G950U)9 Advantages Samsung Galaxy S8 (SM-G950U)
+2.9GHz 64bit Octa-Core12%
More powerful processor, you can open your applications faster
vs2.35GHz 64bit Octa-Core
+12GB LPDDR52 times
More RAM memory. Typically more responsive and better for multitasking.
vs4GB LPDDR4
+128GB (101GB available)98%
More internal storage for applications and files
vs64GB (51GB available)
+UFS 3.1Advantage
Fastest write and read storage.
vsUFS 2.0
+HDR10+Advantage
The HDR10+ display provides vibrant colors and more details
vsHDR10
+120Hz100%
The display reproduces more frames per second because the frequency (Hertz) is higher, improves fluidity and tires your eyes less.
vs60Hz
+1440x3200 pixels8%
Higher resolution screen
vs1440x2960 pixels
+6.8"17%
Larger screen
vs5.8"
+(quad camera) 108MP + 10MP + 10MP + 12MP10 times
Higher resolution main camera
vs(back) 12.2MP
+Digital and optical zoomAdvantage
The zoom allows for better focus and approach to take pictures
vsOnly digital zoom
+1/1.33" inches92%
The larger sensor camera lets you take photos with better depth.
vs1/2.55" inches
+(front) 40MP4 times
Higher resolution secondary camera to take pictures and selfies
vs(front) 8MP
+8K UHD (7680x4320)3 times
More image quality for recording videos with the primary camera
vs4K UHD (3840x2160)
+(front) 4K UHD (3840x2160)125%
More image quality for recording videos with the secondary camera
vs(front) 2K UHD (2560x1440)
+Android 12Advantage
Android 12 is newer and safer
vsAndroid 9.0 Pie
+5G SA/NSAAdvantage
The 5G SA/NSA network is newer and faster
vs4G+ LTE-A
+(5G SA/NSA) 5000 Mbps4 times
Faster for surfing the internet and download files
vs(4G+ LTE-A) 1024 Mbps
+5000 mAh67%
Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
vs3000 mAh
+25W67%
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
+1 slot (Single-SIM) + e-SIM (Eletronic)Advantage
It's more advantageous to have more than one phone operator in the same device
vs1 slot (Single-SIM)
(dedicated slot)
+802.11 a/b/g/n/ac/ax wifi6 (2.4Ghz, 5Ghz) + MIMOAdvantage
WiFi 802.11 a/b/g/n/ac/ax wifi6 (2.4Ghz, 5Ghz) + MIMO is newer and faster
vs802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
+5.2 + A2DP/LEAdvantage
Bluetooth 5.2 + A2DP/LE is newer and faster
vs5.0 + A2DP/LE
+USB 3.2 Type-C, USB OTG On-The-GoAdvantage
Newer and faster USB version for transferring photos, mp3 or data.
vsUSB 3.1 Type-C, USB OTG On-The-Go
Not supportedvs+Until 1TB microSD, microSDXCAdvantage
More external storage for files using memory cards
227 grams (7.95 ounces)vs+155 grams (5.43 ounces)46%
Lighter
8.9 millimeters (0.35 inches)vs+8 millimeters (0.31 inches)11%
Thinner
516 PPIvs+568 PPI10%
Crisper display of text, images and videos because it has more pixels per inch (ppi)
f/1.8 (aperture)vs+f/1.7 (aperture)6%
Diaphragm opening (Aperture) of the camera which has the smallest F number takes photos with better light exposure.
Type-C reversible connectorvs+3.5mm jackAdvantage
Headsets with 3.5mm Jack size are more common and easy to find in stores
Not supportedvs+Heart rateAdvantage
Sensors help you use the device
Not supportedvs+Iris scannerAdvantage
Sensors help you use the device
Not supportedvs+SpO2Advantage
Sensors help you use the device

32 Common items in both devices
Aluminum frame, glass front/back
Dynamic AMOLED / Super AMOLED
16 million
LED flash
PDAF: phase detection autofocus on both cameras / PDAF on back camera and autofocus front camera
OIS: Optical stabilization
BSI sensor
+25 specs and more in the table below

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

Highlight differencesClear highlight

📱 Model features

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
ModelGalaxy S21 Ultra (SM-G998B 128GB)Galaxy S8 (SM-G950U)
Other model namesGalaxy S21 Ultra 5G (SM-G998B Single-SIM)Galaxy S8 G950U Unlocked (Snapdragon), Samsung Dream
Country or region availableAustralia
Australia
USA
USA
BrandSamsungSamsung
Release date1/29/2021, Announced: 1/14/20214/21/2017, Announced: 3/29/2017
Depth8.9 millimeters (0.35 inches)8 millimeters (0.31 inches)
Size (width x height)75.6 x 165.1 millimeters (2.98 x 6.5 in)68.1 x 148.9 millimeters (2.68 x 5.86 in)
Weight227 grams (7.95 ounces)155 grams (5.43 ounces)
Build, materialsAluminum frame, glass front/backAluminum frame, glass front/back
Protection against water and othersIP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistantIP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant

🤖 Operating System

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
System versionAndroid 11Android 7.0 Nougat
Firmware updateAndroid 12Android 9.0 Pie
User InterfaceOne UI 3.1 / 4.0feature not registered

⚙️ Processor

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
Chipset64bit - Samsung Exynos 2100 (5nm)64bit - Qualcomm Snapdragon 835 (MSM8998) (10nm)
CPUOcta-Core, 3 processors:
2.9GHz Single-Core ARM Cortex-X1
2.8GHz Triple-Core ARM Cortex-A78
2.2GHz Quad-Core ARM Cortex-A55
Octa-Core, 2 processors:
2.35GHz Quad-Core Kryo 280
1.9GHz Quad-Core Kryo 280
GPU graphical controllerARM Mali-G78 MP14 (854MHz)Qualcomm Adreno 540 (670-710MHz)
Performance (benchmark)AnTuTu: 657150 (v8), 727634 (v9)
Geekbench: 3457 (v5.2)
GFXBench: 51fps (ES 3.1 onscreen)
AnTuTu: 199022 (v7)
Geekbench: 6656 (v4.4)
GFXBench: 13fps (ES 3.1 onscreen)

💽 Memory and storage

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
RAM memory12GB LPDDR54GB LPDDR4
Internal storage128GB (101GB available)
UFS 3.1
64GB (51GB available)
UFS 2.0
External storageNot supportedUntil 1TB microSD, microSDXC
(dedicated slot)

📲 Display

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
Display typeDynamic AMOLEDSuper AMOLED
Screen size6.8" inches5.8" inches
Screen-to-body ratio~89.4% (screen-to-body ratio)~84.2% (screen-to-body ratio)
Display resolution1440x3200 pixels (20:9)1440x2960 pixels (18.5:9)
TouchscreenCapacitive Multitouch 10-pointsCapacitive Multitouch 10-points
Pixel density (dot pitch)516 PPI568 PPI
Colors16 million16 million
Scratch-resistant glassGorilla Glass VictusGorilla Glass 5
Display features120Hz, 1500nits[peak]
HDR10+
Always-On Display
60Hz
HDR10

📶 Mobile networks

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
Dual-SIMDual-SIM Standby - Call active on one sim cardNot supported
SIM card1 slot (Single-SIM)
nano-SIM (4FF) + e-SIM
1 slot (Single-SIM)
nano-SIM (4FF)
Maximum download/upload5000/1920 Mbps1024/150 Mbps
Network technology2G, 3G, 4G, 5G2G, 3G, 4G
Frequency, bandsExpand band detailsCollapse details
GSM MHz bandQuad-Band 850/900/1800/1900Quad-Band 850/900/1800/1900
Primary 2G networkGSM 850/900/1800/1900CDMA 800/1900, GSM 850/900/1800/1900
Primary 3G networkUMTS 850/900/1700/1900/2100CDMA2000 1xEV-DO
UMTS 850/900/1700/1900/2100
Primary 4G networkLTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66)
TD-LTE (38, 39, 40, 41)
VoLTE
LTE Cat16 (1, 2, 3, 4, 5, 7, 8, 12, 20, 28, 29, 30)
TD-LTE (38, 39, 40, 41)
Primary 5G networkSA/NSA/Sub6 (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78)Not supported
Primary data networkGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, 5G SA/NSAGPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A
Secondary 2G networkGSM 850/900/1800/1900Not supported
Secondary 3G networkUMTS 850/900/1700/1900/2100Not supported
Secondary 4G networkLTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66)
TD-LTE (38, 39, 40, 41)
VoLTE
Not supported
Secondary data networkGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, 5G SA/NSANot supported

📷 Camera

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
Back camera (main camera)(quad camera)
108 megapixels
10MP periscope telephotof/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom
10MP telephotof/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom
12MP ultrawidef/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video
12.2 megapixels
Main camera resolution12000x9000 pixels4032x3024 pixels
Video recording (primary)8K UHD (7680x4320) 24 fps4K UHD (3840x2160) 30 fps
FlashLED flashLED flash
Focal aperturef/1.8 (aperture)f/1.7 (aperture)
Focal length26mm lens26mm lens
Sensor size1/1.33" inches1/2.55" inches
Pixel size1.8µm pixel1.4µm pixel
AutofocusPDAF: phase detection autofocus on both camerasPDAF on back camera and autofocus front camera
Touch focusSupportedSupported
Image stabilizationOIS: Optical stabilizationOIS: Optical stabilization
ZoomDigital and optical zoomOnly digital zoom
Face/smile detectionFace detection, Smile detectionFace detection, Smile detection
BSI sensorSupportedSupported
HDRHDR photo/video on both camerasHDR photo/video on both cameras
Camera extras4K@60fps
1080p@240fps
720p@960fps
feature not registered

📸 Front camera

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
Front camera (secondary)40 megapixels8 megapixels
Front camera resolution7296x5472 pixels3264x2448 pixels
Video recording (secondary)4K UHD (3840x2160)2K UHD (2560x1440)
Front flashNot supportedNot supported
Focal aperturef/2.2 (aperture)f/1.7 (aperture)
Focal length26mm lens25mm lens
Sensor size1/2.8" inches1/3.6" inches
Pixel size0.7µm pixel1.22µm pixel

🔉 Sound and multimedia

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
LoudspeakerStereo sound
32-bit/384kHz
Dolby Atmos
Tuned by AKG
Supported
Active noise cancellation2 microphones or more2 microphones or more
RadioFMFM
TVNot supportedNot supported
Video formatsMP4, H.265, H.264, H.263, XviD, MKVMP4, H.265, H.264, H.263, DivX, XviD
Audio formatsMP3, WAV, WMA, eAAC+, FLACMP3, WAV, eAAC+, FLAC

🔌 Connectivity

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
USBUSB 3.2 Type-C, USB OTG On-The-GoUSB 3.1 Type-C, USB OTG On-The-Go
Audio outputType-C reversible connector3.5mm jack
TV outputUSB Type-C (reversible)USB Type-C (reversible)
Bluetooth5.2 + A2DP/LE5.0 + A2DP/LE
WiFi802.11 a/b/g/n/ac/ax wifi6 (2.4Ghz, 5Ghz) + MIMO
WiFi Direct, hotspot
802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
WiFi Direct, hotspot
DLNASupportedSupported
GPSA-GPS, GeoTagging, GLONASS, GALILEO, BeiDouA-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFCSupportedSupported
Infrared portNot supportedNot supported

🧭 Sensors

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
SensorsAccelerometer
Ambient Light sensor
ANT+
Barometer
Compass
Face unlock
Fingerprint sensor (under display)
Gesture
Gyroscope
Hall effect
Proximity sensor
Accelerometer
Ambient Light sensor
ANT+
Barometer
Compass
Face unlock
Fingerprint sensor (rear-mounted)
Gyroscope
Hall effect
Heart rate
Iris scanner
Proximity sensor
SpO2
Vibrating alertSupportedSupported

🔋 Battery

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
Battery typeLiPo: Li-Ion polymer (Non removable)Li-Ion: Lithium-Ion (Non removable)
Battery capacity5000 mAh3000 mAh
Charger, watts25W Fast battery charging
15W Qi wireless charging (Qi/PMA)
4.5W Reverse wireless charging between devices
USB Power Delivery 3.0
15W (9V/1.67A) Fast battery charging
Qi wireless charging (Qi/PMA)
Quick Charge 2
Talk time autonomyfeature not registered29 hours (1.2 days)
Standbyfeature not registered326 hours (13.6 days)

➕ Other features

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
Call controlVoice dialing, Voice recorder, Voice commandsVoice dialing, Voice recorder, Voice commands
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: Phantom Black, Silver, Titanium, Navy, Brown
- Samsung Pay (Visa, MasterCard)
- Samsung DeX
- Stylus pen support
- Colors: Black, Silver, Blue, Gold, Orchid Gray
- Samsung DeX (desktop experience)
- Curved edge screen
- Corning Gorilla Glass 5 back panel
- Samsung Gear VR compatible
- Samsung Pay
- 32bit/192kHz audio

☢️ Radiation rate

Samsung Galaxy S21 Ultra (SM-G998B 128GB)Samsung Galaxy S8 (SM-G950U)
SAR 1.6W/kg (USA, Mexico, etc.)0.24W/kg (head), 0.72W/kg (body)0.75W/kg (head), 0.93W/kg (body)
SAR 2W/kg (Europe, UK, etc.)0.714W/kg (head), 1.58W/kg (body)feature not registered
X

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