Apple S9 vs Apple S8 Full Specs - HMC

2 Cores 2 Threads 2.02GHz	2 Cores 2 Threads 1.73GHz
TDP 2W	TDP 2W
Bandwidth 25.6GB/s LPDDR5	Bandwidth 12.8GB/s LPDDR4
iGPU S9	iGPU S8
·· 112.6 GFLOPSFP16	·· 86.4 GFLOPSFP16

2 Cores	2 Cores
2 Threads	2 Threads

Base Clock 2.02GHz	Base Clock 1.73GHz
Overclocking Locked	Overclocking Locked

L1i 128KB	L1i 96KB
L1d 64KB	L1d 48KB
L2 4MB shared	L2 4MB shared
SLC Cache 4MB	SLC Cache 1MB

Type LPDDR5	Type LPDDR4
Max Memory 2GB	Max Memory 1.5GB
ECC No	ECC No
Channels 1	Channels 1
Bus Width 32-bit	Bus Width 32-bit
Speed 6400MT/s	Speed 3200MT/s
Bandwidth 25.6GB/s	Bandwidth 12.8GB/s
Bandwidth Calculator Channels Transfer Rate ·· 25.6GB/s	Bandwidth Calculator Channels Transfer Rate ·· 12.8GB/s

TDP

2W

TDP

2W

iGPU S9	iGPU S8
Shaders 128	Shaders 64
Boost Clock 440MHz	Boost Clock 675MHz
·· 112.6 GFLOPSFP16	·· 86.4 GFLOPSFP16

NPU Model H15 Crius	NPU Model H11 Mercury
NPU Cores 4	NPU Cores 2
Performance 4.3 TOPSFP16	Performance 2 TOPSFP16

Manufacturer Apple	Manufacturer Apple
ISA AArch64	ISA AArch64
Architecture Apple Silicon 12ARMv8.5-A	Architecture Apple Silicon 9ARMv8.4-A
Family S Series	Family S Series
Branding	Branding
Codename Caicos Sawtooth P-Core	Codename Turks ThunderP-Core
Market Segment Smartwatch	Market Segment Smartwatch
Release Date Sep 12, 2023	Release Date Sep 16, 2022

Foundry TSMC	Foundry TSMC
Fabrication Node N4P	Fabrication Node N7P
Die Size 41mm²	Die Size 40mm²
Transistor Count 5.6 Billion	Transistor Count 3.5 Billion
Transistor Density 135 MTr/mm²	Transistor Density 88 MTr/mm²

Smartwatches

Apple Watch Series 9(41mm)Apple Watch Series 9(45mm)Apple Watch Series 9 SS(41mm)

Smartwatches

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