Apple M3 Ultra (28C60G) vs Intel Xeon 676X Full Specs

Summary

28 Cores(20P+8E) 28 Threads(20P+8E) 4.05GHz	32 Cores 64 Threads 2.8GHz
TDP 300W	TDP 275W
Bandwidth 819.2GB/s LPDDR5	Bandwidth 512GB/s DDR5 MRDIMM·DDR5
iGPU 60-Core M3 Ultra	iGPU 0
Peak·FP32·FP16 21.2 TFLOPSFP16	Peak·FP32·FP16 -
Socket -	Socket LGA 4710

Highlights

Geekbench 6 Single

Geekbench 6 Single Geekbench 6 Multi Max Bandwidth iGPU Peak iGPU FP32 iGPU FP16 NPU TOPS TDP

M3 Ultra (28C60G)3,221

x1

Xeon 676X-

-

Show Top Score

Core Config

28 Cores 20P 8E	32 Cores 32P -
28 Threads 20P 8E	64 Threads 64P -

Clocks

Base Clock 4.05GHz	Base Clock 2.8GHz
Boost Clock -	Boost Clock 4.9GHz
Overclocking Locked	Overclocking Unlocked

Cache

L1i 192KB P 128KB E	L1i 64KB P -
L1d 128KB P 64KB E	L1d 48KB P -
L2 64MB P shared 4MB E shared	L2 2MB P - -
L3 -	L3 144MB
SLC Cache 96MB	SLC Cache -

Memory

Type LPDDR5	Type DDR5 MRDIMM·DDR5
Max Memory 128GB	Max Memory 4.1TB
ECC No	ECC Yes
Channels 8	Channels 8
Bus Width 1024-bit	Bus Width 512-bit
Speed 6400MT/s	Speed 8000MT/s
Bandwidth 819.2GB/s	Bandwidth 512GB/s
Bandwidth Calculator Channels Transfer Rate6400MT/s Calculated Bandwidth 819.2GB/s	Bandwidth Calculator Channels Transfer Rate8000MT/s Calculated Bandwidth 512GB/s

Power & Thermals

TDP 300W	TDP 275W
Peak Power -	Peak Power 330W
Max Operating Temp 100°C Max	Max Operating Temp 99°C Max
T-Case -	T-Case 78°C Max

Expansion

PCIe PCIe 4.0 x32 63GB/sBandwidth

PCIe PCIe 5.0 x128 504.1GB/sBandwidth

iGPU

iGPU 60-Core M3 Ultra	iGPU 0
Shaders 7680	Shaders -
Boost Clock 1.38GHz	Boost Clock -
Peak·FP32·FP16 21.2 TFLOPSFP16	Peak·FP32·FP16 -

NPU

NPU Model H15 Erebus	NPU Model -
NPU Cores 32	NPU Cores -
NPU Clock 2.36GHz	NPU Clock -
Performance 36 TOPSFP16	Performance -

Chip

Manufacturer Apple	Manufacturer Intel
ISA AArch64	ISA x86-64
Architecture Apple Silicon 13ARMv8.6-A	Architecture Granite Rapids
Family M Series	Family Xeon 6
Branding	Branding
Codename Palma-D - M3 UltraVariant EverestP-Core - Sawtooth E-Core	Codename Granite Rapids-D 27Die Granite Rapids-HCCVariant Redwood CoveP-Core 32M-Core -
Market Segment Workstation	Market Segment Workstation
Release Date Mar 5, 2025	Release Date Feb 2, 2026

Fabrication

Foundry TSMC	Foundry Intel
Other Foundries -	Other Foundries IntelIO
Fabrication Node N3B -	Fabrication Node Intel 3 Intel 7IO
Die Size 954mm² -	Die Size 598mm² 482mm²IO
Transistor Count 184 Billion	Transistor Count -
Transistor Density 193 MTr/mm²	Transistor Density -

Images

No images available

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Used In

Desktops Mac Studio(M3 Ultra, Early 2025)

Desktops -

Competitors

AppleM3 Ultra (28C60G) vs CPU AppleM3 Ultra (32C80G) AppleM3 Ultra (28C60G) vs CPU AppleM4 (10C8G-FL) AppleM3 Ultra (28C60G) vs CPU IntelXeon 658X Show 12 more

IntelXeon 676X vs CPU IntelXeon 674X IntelXeon 676X vs CPU IntelXeon 658X IntelXeon 676X vs CPU IntelXeon 678X Show 12 more