Asus ROG Phone II vs Samsung Galaxy S21 Ultra Specs Comparison

Compare mobile phone specifications of up to three devices at once. Our specs comparison tool helps you find and compare the perfect phone for your needs.

8.5
Asus ROG Phone II
9.1
Samsung Galaxy S21 Ultra
Asus ROG Phone II Samsung Galaxy S21 Ultra
Released · Sep 04, 2019
Released · Jan 29, 2021
6.6-inch
6.8-inch
Dual camera
Quad camera
12GB · 512GB
12GB · 128GB
6000 mAh
5000 mAh
Check prices

Design

Dimensions
6.73 x 3.06 x 0.37 inches
170.99 x 77.6 x 9.48 mm
6.50 x 2.98 x 0.35 inches (~0.37 inches with camera bump)
165.1 x 75.6 x 8.9 mm (~9.4 mm with camera bump)
Weight
8.47 oz (240.0 g) 8.04 oz (229.0 g)
Materials
Back: Glass (Corning Gorilla Glass 3)
Frame: Aluminum
Back: Glass (Corning Gorilla Glass Victus)
Frame: Aluminum
Resistance
Water, Dust; IP68
Biometrics
2D Face unlock, Optical in-screen fingerprint 2D Face unlock, Ultrasonic in-screen fingerprint
Keys
Right: Volume control, Lock/Unlock key
Colors
Black Glare Phantom black, Silver

Display

Size
6.6-inch 6.8-inch
Resolution
2340x1080px, 19.5:9 ratio, 391 PPI 3200x1440px, 20:9 ratio, 516 PPI
Technology
AMOLED Dynamic AMOLED
Refresh rate
120Hz 120Hz (adaptable)
Screen-to-body
80.24 % 89.33 %
Peak brightness
600 cd/m2 (nit) 1500 cd/m2 (nit)
Features
HDR support, Scratch-resistant glass (Corning Gorilla Glass 6), Ambient light sensor, Proximity sensor HDR support, Scratch-resistant glass (Corning Gorilla Glass Victus), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 855 Plus SM8150-AC (7 nm) Qualcomm Snapdragon 888 SM8350 (5 nm)
Processor
Octa-core
2960 MHz
Kryo 485
Octa-core
1x 2.84GHz Kryo 680 + 3x 2.42GHz Kryo 680 + 4x 1.80GHz Kryo 680
GPU
Adreno 640 Adreno 660
RAM
12GB (LPDDR4) 12GB (LPDDR5)
Internal storage
512GB (UFS 3.0) 128GB (UFS 3.1)
Storage expansion
not expandable not expandable
OS
Android (11, 10, 9.0 Pie) Android (14, 13, 12, 11), One UI

Battery

Capacity
6000 mAh 5000 mAh
Type
Li - Polymer
Charging
Qualcomm Quick Charge 4+, USB Power Delivery Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging, Reverse wireless charging
Charge speed
Wired: 25.0W
Wireless: 15.0W
PhoneArena Battery Tests
Battery Life Estimate
Untested
Browsing
Untested
Video
Untested
Gaming
Untested
Battery Life Estimate
6h 15min
Browsing
14h 43min
Video
8h 52min
Gaming
8h 40min

Camera

Rear
Dual camera Quad camera
Main camera
48 MP (Laser and PDAF)
Aperture size: F1.8
Focal length: 26 mm
Sensor size: 1/2"
Pixel size: 0.8 μm
108 MP (OIS, Laser and PDAF)
Aperture size: F1.8
Focal length: 24 mm
Sensor size: 1/1.33"
Pixel size: 0.8 μm
Second camera
13 MP (Ultra-wide)
Aperture size: F2.4
Focal Length: 11 mm
12 MP (Ultra-wide, PDAF)
Aperture size: F2.2
Focal Length: 13 mm
Sensor size: 1/2.55"
Pixel size: 1.4 μm
Third camera
10 MP (Telephoto, OIS, PDAF)
Optical zoom: 3.0x
Aperture size: F2.4
Focal Length: 70 mm
Sensor size: 1/3.2"
Pixel size: 1.22 μm
Fourth camera
10 MP (Telephoto, Periscope, OIS, PDAF)
Optical zoom: 3.0x
Aperture size: F2.4
Focal Length: 70 mm
Sensor size: 1/3.2"
Pixel size: 1.22 μm
Flash
Dual LED LED
Video recording
3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (480 fps)
Time-lapse video, Picture-taking during video recording, EIS
7680x4320 (8K UHD) (24 fps), 3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps)
OIS, HDR, Hyperlapse, Video light, EIS
Front
24 MP (HDR), Video capture: 1920x1080 (Full HD) 40 MP (PDAF, HDR), Video capture: 3840x2160 (4K UHD) (60 fps)

Connectivity & Features

Bluetooth
5.0, Yes 5.1
WLAN
802.11 a,b,g,n,ac,ad,dual-band
MIMO, Wi-Fi Direct, Hotspot
802.11 a,b,g,n,ac,ax(Wi-Fi 6),dual-band
MIMO, Wi-Fi Direct, Hotspot
USB
Type-C, USB 3.1 Type-C, USB 3.2
Hearing aid compatible
M3/T3 M3/T3
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Dual-band positioning, Cell ID, Wi-Fi positioning GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers) Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer
Other
NFC NFC, ANT+

Multimedia

Headphones
3.5mm jack No 3.5mm jack
Speakers
Earpiece, Multiple speakers Earpiece, Multiple speakers
Features
DTS:X Virtual Surround, aptX-HD 32-Bit DAC, Dolby Atmos, aptX, Dolby Digital, Dolby Digital Plus
Screen mirroring
DLNA,Wireless screen share Wireless screen share
Radio
FM FM, Stereo, RDS
Additional microphone(s)
Noise cancellation Noise cancellation, Video recording

Cellular

5G
Bands n2, n5, n12, n25, n41, n66, n71, n77, n260, n261, SA, NSA, Sub-6, mmWave
4G (FDD)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 17(700 b), 18(800 Lower), 19(800 Upper), 20(800 DD), 26(850+), 28(700 APT), 29(700 d), 32(1500 L-band), 66(AWS-3) Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 14(700 PS), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 30(2300 WCS), 66(AWS-3), 71(600)
4G (TDD)
Bands 34(2000), 38(2600), 39(1900+), 40(2300), 41(2600+), 46 Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 46, 48(3600)
3G
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900) Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Data Speed
LTE-A Pro Cat 18 (1200/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s LTE-A Pro Cat 20 (2000/150 Mbit/s)
Dual SIM
Yes
SIM type
Nano SIM Nano SIM

Regulatory Approval

FCC approval
Date approved: Aug 13, 2019
FCC ID value: MSQI001D
Date approved: Dec 22, 2020
FCC ID value: A3LSMG998U
Measured SAR
Head: 1.04 W/kg
Body: 0.83 W/kg
Simultaneous Transmission: 1.59 W/kg
Wireless Router: 1.19 W/kg
Head: 0.77 W/kg
Body: 1.02 W/kg
Simultaneous Transmission: 1.59 W/kg
Wireless Router: 1.16 W/kg
Phablet: 3.15 W/kg

Buyers information

MSRP
$ 1200 / € 1399
In The Box
AeroActive Cooler II, ASUS ZenEar Pro Hi-Res earphone with microphone (optional), Transparent case / Aero case, Type-C to C Cable (120cm), Ejector pin (SIM tray needle), USB power adapter (18W / 30W), Documentation (user guide, warranty card) C to C Data Cable, Ejection Pin

Availability

Officially announced
Jul 22, 2019 Jan 14, 2021

Alternative variants

Internal storage 1000GB
Colors Matte Black
Data Speed LTE-A Pro Cat 20 (2000/150 Mbit/s)
with 256GB storage
Internal storage 256GB
Colors Phantom black
MSRP $ 1250
with 512GB storage
RAM 16GB
Internal storage 512GB
Colors Phantom black
MSRP $ 1380
for Europe
System chip Samsung Exynos 2100 (5 nm)
Processor Octa-core
1x 2.91GHz Cortex-X1 + 3x 2.81GHz Cortex-A78 + 4x 2.2GHz Cortex-A55
GPU Mali G78 MP14
Weight 8.01 oz (227.0 g)
5G Bands SA, NSA, Sub-6
FCC approval Date approved: Dec 22, 2020
FCC ID value: A3LSMG998B
Measured SAR Head: 0.16 W/kg
Body: 0.72 W/kg
Simultaneous Transmission: 1.59 W/kg
Wireless Router: 1.34 W/kg
Phablet: 3.86 W/kg
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