Apple S3 vs Apple S8 Full Specs - HMC

2 Cores 2 Threads 780MHz	2 Cores 2 Threads 1.73GHz
TDP 2W	TDP 2W
Bandwidth 12.8GB/s LPDDR4	Bandwidth 12.8GB/s LPDDR4
iGPU PowerVR GX6250 S3	iGPU S8
·· 57.6 GFLOPSFP16	·· 86.4 GFLOPSFP16

S312.8GB/s

x1

S812.8GB/s

x1

2 Cores	2 Cores
2 Threads	2 Threads

Base Clock 780MHz	Base Clock 1.73GHz
Overclocking Locked	Overclocking Locked

L1i 32KB	L1i 96KB
L1d 32KB	L1d 48KB
L2 512KB	L2 4MB shared
SLC Cache -	SLC Cache 1MB

Type LPDDR4	Type LPDDR4
Max Memory 768MB	Max Memory 1.5GB
ECC No	ECC No
Channels 1	Channels 1
Bus Width 32-bit	Bus Width 32-bit
Speed 3200MT/s	Speed 3200MT/s
Bandwidth 12.8GB/s	Bandwidth 12.8GB/s
Bandwidth Calculator Channels Transfer Rate Calculated Bandwidth 12.8GB/s	Bandwidth Calculator Channels Transfer Rate Calculated Bandwidth 12.8GB/s

TDP

2W

TDP

2W

iGPU PowerVR GX6250 S3	iGPU S8
Shaders 32	Shaders 64
Boost Clock 450MHz	Boost Clock 675MHz
·· 57.6 GFLOPSFP16	·· 86.4 GFLOPSFP16

NPU Model -	NPU Model H11 Mercury
NPU Cores -	NPU Cores 2
Performance -	Performance 2 TOPSFP16

Modem Model X7	Modem Model -
Peak Down Up to 300Mbps	Peak Down -
Peak Up Up to 50Mbps	Peak Up -

Manufacturer Apple	Manufacturer Apple
ISA AArch32	ISA AArch64
Architecture ARMv7k	Architecture Apple Silicon 9ARMv8.4-A
Family S Series	Family S Series
Branding	Branding
Codename - Cortex-A7P-Core	Codename Turks ThunderP-Core
Market Segment Smartwatch	Market Segment Smartwatch
Release Date Sep 22, 2017	Release Date Sep 16, 2022

Foundry Samsung	Foundry TSMC
Fabrication Node 28nm	Fabrication Node N7P
Die Size 34mm²	Die Size 40mm²
Transistor Count 338 Million	Transistor Count 3.5 Billion
Transistor Density 10 MTr/mm²	Transistor Density 88 MTr/mm²

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Smartwatches

Apple Watch Series 3(38mm)Apple Watch Series 3(42mm)Apple Watch Series 3 SS(38mm)

Smartwatches

Apple Watch Series 8(41mm)Apple Watch Series 8(45mm)Apple Watch Series 8 SS(41mm)