AMD EPYC 7643 vs AMD EPYC 7251

VS

AMD EPYC 7643

AMD EPYC 7251

We compared two server CPUs: AMD EPYC 7643 with 48 cores 2.3GHz and AMD EPYC 7251 with 8 cores 2.1GHz . You will find out which processor performs better in benchmark tests, key specifications, power consumption and more.

Main Differences

AMD EPYC 7643 's Advantages

Released 3 years and 9 months late

Higher specification of memory (3200 vs 2400)

Newer PCIe version (4 vs 3)

Higher base frequency (2.3GHz vs 2.1GHz)

Larger L3 cache size (256MB vs 32MB)

More modern manufacturing process (7nm vs 14nm)

AMD EPYC 7251 's Advantages

Lower TDP (120W vs 225W)

Score

Benchmark

Geekbench 6 Single Core

AMD EPYC 7643 +117%

1696

AMD EPYC 7251

781

Geekbench 6 Multi Core

AMD EPYC 7643 +172%

9939

AMD EPYC 7251

3651

AMD EPYC 7643

VS

AMD EPYC 7251

General Parameters

Mar 2021

Release Date

Jun 2017

AMD

Manufacturer

AMD

Server

Type

Server

Milan

Core Architecture

Naples

AMD Socket SP3

Socket

AMD Socket SP3

N/A

Integrated Graphics

N/A

EPYC (Zen 3 (Milan))

Generation

EPYC (Zen (Naples))

Package

33.2 billions

Transistor Count

4.8 billions

7 nm

Manufacturing Process

14 nm

225 W

Power Consumption

120 W

-

Peak Operating Temperature

81 °C

TSMC

Foundry

GlobalFoundries

8x81 mm²

Die Size

213 mm²

12 nm

I/O Process Size

-

416 mm²

I/O Die Size

-

CPU Performance

2.3 GHz

Performance Core Base Frequency

2.1 GHz

3.6 GHz

Performance Core Turbo Frequency

2.9 GHz

48

Total Core Count

8

96

Total Thread Count

16

100 MHz

Bus Frequency

100 MHz

23.0

Multiplier

21.0

64 KB per core

L1 Cache

96 K per core

512 KB per core

L2 Cache

512 K per core

256 MB shared

L3 Cache

32 MB shared

No

Unlocked Multiplier

Yes

6

Cores per CCD

-

2

SMP

2

Memory Parameters

DDR4-3200

Memory Types

DDR4-2400

8

Max Memory Channels

8

Yes

ECC Memory Support

Yes

Miscellaneous

4

PCIe Version

3

128

PCIe Lanes

-

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