Apple S3 vs Apple S4 Full Specs - HMC

2 Cores 2 Threads 780MHz	2 Cores 2 Threads 1.59GHz
TDP 2W	TDP 2W
Bandwidth 12.8GB/s LPDDR4	Bandwidth 12.8GB/s LPDDR4
iGPU PowerVR GX6250 S3	iGPU S4
·· 57.6 GFLOPSFP16	·· 71.94 GFLOPSFP16

S312.8GB/s

x1

S412.8GB/s

x1

2 Cores	2 Cores
2 Threads	2 Threads

Base Clock 780MHz	Base Clock 1.59GHz
Overclocking Locked	Overclocking Locked

L1i 32KB	L1i 32KB
L1d 32KB	L1d 32KB
L2 512KB	L2 2MB shared
SLC Cache -	SLC Cache 1MB

Type LPDDR4	Type LPDDR4
Max Memory 768MB	Max Memory 1GB
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 S4
Shaders 32	Shaders 64
Boost Clock 450MHz	Boost Clock 562MHz
·· 57.6 GFLOPSFP16	·· 71.94 GFLOPSFP16

NPU Model -	NPU Model H11 Mercury
NPU Cores -	NPU Cores 2
Performance -	Performance 1.3 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 8ARMv8.3-A
Family S Series	Family S Series
Branding	Branding
Codename Cortex-A7P-Core	Codename TempestP-Core
Market Segment Smartwatch	Market Segment Smartwatch
Release Date Sep 22, 2017	Release Date Sep 21, 2018

Foundry Samsung	Foundry TSMC
Fabrication Node 28nm	Fabrication Node N7
Die Size 34mm²	Die Size 38mm²
Transistor Count 338 Million	Transistor Count -
Transistor Density 10 MTr/mm²	Transistor Density -

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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 4(40mm)Apple Watch Series 4(44mm)Apple Watch Series 4 SS(40mm)