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EPYC Embedded 3251
General Info
Designer	AMD
Manufacturer	GlobalFoundries
Model Number	3251
Part Number	PE3251BGR88AF
Market	Server, Embedded
Introduction	February 21, 2018 (announced) February 21, 2018 (launched)
End-of-life	2028 (last order)
Release Price	$315
Shop	Amazon
General Specs
Family	EPYC Embedded
Series	3000
Locked	Yes
Frequency	2,500 MHz
Turbo Frequency	3,100 MHz (1 core), 3,100 MHz (8 cores)
Clock multiplier	25
CPUID	0x00800F12
Microarchitecture
ISA	x86-64 (x86)
Microarchitecture	Zen
Core Name	Snowy Owl
Core Family	23
Core Model	1
Core Stepping	B2
Process	14 nm
Transistors	4,800,000,000
Technology	CMOS
Die	213 mm²
Word Size	64 bit
Cores	8
Threads	16
Max Memory	512 GiB
Multiprocessing
Max SMP	1-Way (Uniprocessor)
Electrical
TDP	55 W
Tjunction	0 °C – 105 °C
Packaging
Package	SP4r2 (FC-OBGA)
Dimension	45 mm × 45 mm
Pitch	0.8 mm

EPYC Embedded 3251 is a 64-bit octa-core x86 embedded microprocessor introduced by AMD in early 2018 for dense servers and edge devices. This processor has CPU cores based on the Zen microarchitecture and is fabricated on a GlobalFoundries 14 nm process. It operates at 2.5 GHz with a TDP of 55 W and a turbo frequency of up to 3.1 GHz. The 3251 supports up to 512 GiB of dual-channel DDR4-2666 memory.

Cache

Main article: Zen § Cache

[Edit/Modify Cache Info]

Cache Organization Cache is a hardware component containing a relatively small and extremely fast memory designed to speed up the performance of a CPU by preparing ahead of time the data it needs to read from a relatively slower medium such as main memory. The organization and amount of cache can have a large impact on the performance, power consumption, die size, and consequently cost of the IC. Cache is specified by its size, number of sets, associativity, block size, sub-block size, and fetch and write-back policies. Note: All units are in kibibytes and mebibytes.

L1$ 768 KiB 786,432 B 0.75 MiB L1I$ 512 KiB 524,288 B 0.5 MiB 8 × 64 KiB 4-way set associative   L1D$ 256 KiB 262,144 B 0.25 MiB 8 × 32 KiB 8-way set associative write-back L2$ 4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB     8 × 512 KiB 8-way set associative write-back L3$ 16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB     2 × 8 MiB 16-way set associative write-back

Memory controller

[Edit/Modify Memory Info]

	Integrated Memory Controller
	Max Type DDR4-2666 Supports ECC Yes Max Mem 512 GiB Controllers 2 Channels 2 Max Bandwidth 42.67 GB/s 39.74 GiB/s 40,693.283 MiB/s 42,670 MB/s 0.0388 TiB/s 0.0427 TB/s Bandwidth Single 21.33 GB/s Double 42.67 GB/s

Expansions

The EPYC Embedded 3251 integrates two 8-port, 16-lane PCIe Gen 1/2/3 (8 GT/s) controllers. All lanes are configurable as x16/x8/x4/x2/x1 wide (e.g. 1x4 + 4x1 + 1x8) PCIe links, some lanes alternatively as SATA Gen 1/2/3 (6 Gb/s) or 10 Gbit/s Ethernet ports. Up to eight SATA ports and four GbE ports are available on this model, as well as four USB 3.1 Gen 1 (5 Gb/s) ports, and the following low speed interfaces: eMMC, UART, LPC, SPI/eSPI, I²C, SMBus, GPIO.

[Edit/Modify Expansions Info]

	Expansion Options
PCIe Revision: 3.0 Max Lanes: 32 Configuration: x16, x8, x4, x2, x1 USB Revision: 3.1 Max Ports: 4 SATA Revision: 3.0 Max Ports: 8

[Edit/Modify Network Info]

	Networking
	Ethernet 10GbE Yes (Ports: 4)

Features

[Edit/Modify Supported Features]

Supported x86 Extensions & Processor Features

MMX MMX Extension EMMX Extended MMX Extension SSE Streaming SIMD Extensions SSE2 Streaming SIMD Extensions 2 SSE3 Streaming SIMD Extensions 3 SSSE3 Supplemental SSE3 SSE4.1 Streaming SIMD Extensions 4.1 SSE4.2 Streaming SIMD Extensions 4.2 SSE4a Streaming SIMD Extensions 4a AVX Advanced Vector Extensions AVX2 Advanced Vector Extensions 2 ABM Advanced Bit Manipulation BMI1 Bit Manipulation Instruction Set 1 BMI2 Bit Manipulation Instruction Set 2 FMA3 3-Operand Fused-Multiply-Add AES AES Encryption Instructions RdRand Hardware RNG SHA SHA Extensions ADX Multi-Precision Add-Carry CLMUL Carry-less Multiplication Extension F16C 16-bit Floating Point Conversion x86-16 16-bit x86 x86-32 32-bit x86 x86-64 64-bit x86 Real Real Mode Protected Protected Mode SMM System Management Mode FPU Integrated x87 FPU NX No-eXecute SMT Simultaneous Multithreading AMD-Vi AMD-Vi (I/O MMU virtualization) AMD-V AMD Virtualization SME Secure Memory Encryption TSME Transparent SME SEV Secure Encrypted Virtualization SenseMI SenseMI Technology

Bibliography

• "AMD Launches EPYC™ Embedded and Ryzen™ Embedded Processors for End-to-End “Zen” Experiences from the Core to the Edge" (Press release). AMD.com. February 21, 2018.
• "Product Brief: AMD EPYC™ Embedded 3000 Family", AMD Publ. #1887102, 2018
• "Product Brief: AMD EPYC™ Embedded 3000 Family", AMD Publ. #1887102, Rev. E, 2019
• "Embedded Processor Specifications". AMD.com. Retrieved October 2020.