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

Summary

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

Highlights

Peak OPS

Peak OPS FP32 FP16

Apple Watch Series 9112.6 GFLOPS FP16S9

x1.57

Apple Watch Series 4 SS71.94 GFLOPS FP16S4

x1

Show Top Score

System Arch

CPU

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

GPU

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

Memory

2GB

1GB

Storage

64GB

16GB

Display

1.9" LTPO OLED484x396 1000Nits 60Hz Size Res 1.9"	1.57" LTPO OLED394x324 1000Nits 60Hz Size Res 1.6"
Panel & HDR LTPO OLED	Panel & HDR LTPO OLED
Brightness 1000 nits 2000 nits Peak	Brightness 1000 nits Peak
Refresh & VRR 60Hz Variable Refresh	Refresh & VRR 60Hz Variable Refresh
Resolution 484x396 191.7K Pixels 329 ppi	Resolution 394x324 127.7K Pixels 325 ppi
Backlight & Contrast 191.7K zones 1M:1 contrast	Backlight & Contrast 127.7K 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 0-80%: 45 min	Charge Time -
1.19Wh 308mAh 3.85V Lithium-Ion	0.86Wh 225mAh 3.82V Lithium-Ion

Connectivity

Wi-Fi 4E Bluetooth 5.3

Wi-Fi 4 Bluetooth 5.0

Cellular

No Cellular

Cellular

Sensors

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

Power

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

Audio

Speakers 1	Speakers 1
Microphones 1	Microphones 1

OS

Launch OS iOS 10

Launch OS iOS 5

Enclosure

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

Info

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

Images