Apple Watch Series 4 SS (40mm) vs Apple Watch Series 9 (45mm) Full Specs

Summary

CPU S42 Cores	CPU S92 Cores
GPU S464 Shaders	GPU S9128 Shaders
Memory 1GB	Memory 2GB
Storage 16GB	Storage 64GB
Display 1.57" LTPO OLED394x324 1000Nits 60Hz	Display 1.9" LTPO OLED484x396 1000Nits 60Hz
Other Upgrades -	Other Upgrades No Cellular
Price $699	Price $429 MAX

Highlights

Peak OPS

Peak OPS FP32 FP16

Apple Watch Series 4 SS71.94 GFLOPS FP16S4

x1

Apple Watch Series 9112.6 GFLOPS FP16S9

x1.57

Show Top Score

System Arch

CPU

S4	S9
2 Cores 2 Threads 1.59GHz	2 Cores 2 Threads 2.02GHz

GPU

S4	S9
64 Shaders 562MHz	128 Shaders 440MHz
Shared Memory	Shared Memory
Peak·FP32·FP16 71.94 GFLOPSFP16	Peak·FP32·FP16 112.6 GFLOPSFP16

Memory

1GB

2GB

Storage

16GB

64GB

Display

1.57" LTPO OLED394x324 1000Nits 60Hz Size Res 1.6"	1.9" LTPO OLED484x396 1000Nits 60Hz Size Res 1.9"
Panel & HDR LTPO OLED	Panel & HDR LTPO OLED
Brightness 1000 nits Peak	Brightness 1000 nits 2000 nits Peak
Refresh & VRR 60Hz Variable Refresh	Refresh & VRR 60Hz Variable Refresh
Resolution 394x324 127.7K Pixels 325 ppi	Resolution 484x396 191.7K Pixels 329 ppi
Backlight & Contrast 127.7K zones 1M:1 contrast	Backlight & Contrast 191.7K zones 1M:1 contrast
Viewing Angles 178° H 178° V	Viewing Angles 178° H 178° V
Color Depth 8-bit	Color Depth 8-bit
Coating & Lamination Fully Laminated	Coating & Lamination Fully Laminated
Touchscreen Yes	Touchscreen Yes

Battery

Up to 18 hours	Up to 18 hours
Charge Time -	Charge Time 0-80%: 45 min
0.86Wh 225mAh 3.82V Lithium-Ion	1.19Wh 308mAh 3.85V Lithium-Ion

Connectivity

Wi-Fi 4 Bluetooth 5.0

Wi-Fi 4E Bluetooth 5.3

Cellular

Cellular

No Cellular

Sensors

Motion Accelerometer Gyroscope	Motion Accelerometer Gyroscope
Health Optical Heart (PPG) Electrical Heart (ECG) - -	Health Optical Heart (PPG) Electrical Heart (ECG) Blood Oxygen (SpO2) Skin Temperature
Utility Proximity Ambient Light (ALS)	Utility Proximity Ambient Light (ALS)
Communication NFC -	Communication NFC Ultra-Wideband Chip
Location GPS GLONASS Galileo QZSS Beidou -	Location GPS GLONASS Galileo QZSS Beidou Compass

Power

Charger 5W USB-A	-
Output 5W 5.00V 1.00A	Output -
Input 0.15A	Input -
Protocol & Port USB-A	Protocol & Port -
USB-PD 1.00A 5V (5W)	USB-PD -

Audio

Speakers 1	Speakers 1
Microphones 1	Microphones 1

OS

Launch OS iOS 5

Launch OS iOS 10

Enclosure

Build Material Stainless Steel, Sapphire	Build Material Aluminum, Glass
Height 40mm (1.57") Width 34mm (1.34") Depth 10.7mm (0.42")	Height 45mm (1.77") Width 38mm (1.5") Depth 10.7mm (0.42")
Weight 40g	Weight 39g
Volume 0.015L	Volume 0.018L

Info

Release Date 2018-09-21	Release Date 2023-09-12
Warranty 1 year	Warranty 1 year
Description 40mm	Description 45mm

Images