Apple S4 vs Apple S3 Full Specs

Summary

2 Cores 2 Threads 1.59GHz	2 Cores 2 Threads 780MHz
TDP 2W	TDP 2W
Bandwidth 12.8GB/s LPDDR4	Bandwidth 12.8GB/s LPDDR4
iGPU S4	iGPU PowerVR GX6250 S3
Peak·FP32·FP16 71.94 GFLOPSFP16	Peak·FP32·FP16 57.6 GFLOPSFP16

Highlights

Max Bandwidth

Max Bandwidth iGPU Peak iGPU FP32 iGPU FP16 NPU TOPS TDP

S412.8GB/s

x1

S312.8GB/s

x1

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Core Config

2 Cores	2 Cores
2 Threads	2 Threads

Clocks

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

Cache

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

Memory

Type LPDDR4	Type LPDDR4
Max Memory 1GB	Max Memory 768MB
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 Rate3200MT/s UC·Spec·OC 12.8GB/s	Bandwidth Calculator Channels Transfer Rate3200MT/s UC·Spec·OC 12.8GB/s

Power & Thermals

TDP 2W

TDP 2W

iGPU

iGPU S4	iGPU PowerVR GX6250 S3
Shaders 64	Shaders 32
Boost Clock 562MHz	Boost Clock 450MHz
Peak·FP32·FP16 71.94 GFLOPSFP16	Peak·FP32·FP16 57.6 GFLOPSFP16

NPU

NPU Model H11 Mercury	NPU Model -
NPU Cores 2	NPU Cores -
Performance 1.3 TOPSFP16	Performance -

Cellular

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

Chip

Manufacturer Apple	Manufacturer Apple
ISA AArch64	ISA AArch32
Architecture Apple Silicon 8ARMv8.3-A	Architecture ARMv7k
Family S Series	Family S Series
Branding	Branding
Codename TempestP-Core	Codename Cortex-A7P-Core
Market Segment Smartwatch	Market Segment Smartwatch
Release Date Sep 21, 2018	Release Date Sep 22, 2017
Part Number APL S4	Part Number APL S3

Fabrication

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

Images