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AMD EPYC Embedded 7251 vs AMD EPYC Embedded 7643: Comparison
What is the difference between EPYC Embedded 7251 and EPYC Embedded 7643?
The gap that matters here is l3 cache: EPYC Embedded 7251 32 MB against EPYC Embedded 7643 256 MB, which puts EPYC Embedded 7643 88% ahead. There is a split on thread count as well, 16 threads on the EPYC Embedded 7251 versus 96 threads on the EPYC Embedded 7643. Core architecture is not the same on both, Zen on the EPYC Embedded 7251 versus Zen 3 on the EPYC Embedded 7643. They differ on base clock too, 2.1 GHz on the EPYC Embedded 7251 versus 2.3 GHz on the EPYC Embedded 7643. There is a split on memory type as well, DDR4-2667 on the EPYC Embedded 7251 versus DDR4-3200 on the EPYC Embedded 7643. They differ on usb too, 4x USB 3.1 Gen1 on the EPYC Embedded 7251 versus 4x USB 3.0 Gen1 on the EPYC Embedded 7643.
EPYC Embedded 7251 vs EPYC Embedded 7643: which one fits your build
The EPYC Embedded 7251 is the one to take for industrial and embedded system designs and long-lifecycle networking and edge-compute deployments, though it is not the pick for consumer desktop or gaming builds and DIY PC upgrades. The EPYC Embedded 7643 suits industrial and embedded system designs and long-lifecycle networking and edge-compute deployments, though it is the wrong buy for consumer desktop or gaming builds and DIY PC upgrades.
Where the two are identical
Everything else lines up. Pcie lanes, socket, security processor, memory controller and sata read the same on both, so those are not worth weighing. They match on 1 further specification as well.
Frequently asked questions
Do the EPYC Embedded 7251 and EPYC Embedded 7643 differ on boost clock?
Yes. Boost Clock reads 2.9 GHz on the EPYC Embedded 7251 versus 3.6 GHz on the EPYC Embedded 7643.
Is the Low Speed Interfaces the same on the EPYC Embedded 7251 and EPYC Embedded 7643?
It is. Both are listed at GPIO , I2C , LPC , SMBus , SPI..., so it is not a reason to pick one over the other.
Specs and benchmarks
Core Count
- AMD EPYC Embedded 7251
- 8 cores
- AMD EPYC Embedded 7643
- 48 cores
Thread Count
- AMD EPYC Embedded 7251
- 16 threads
- AMD EPYC Embedded 7643
- 96 threads
Core Architecture
- AMD EPYC Embedded 7251
- Zen
- AMD EPYC Embedded 7643
- Zen 3
Base Clock
- AMD EPYC Embedded 7251
- 2.1 GHz
- AMD EPYC Embedded 7643
- 2.3 GHz
Boost Clock
- AMD EPYC Embedded 7251
- 2.9 GHz
- AMD EPYC Embedded 7643
- 3.6 GHz
L3 Cache
- AMD EPYC Embedded 7251
- 32 MB-87%
- AMD EPYC Embedded 7643
- 256 MBBest
Socket
- AMD EPYC Embedded 7251
- SP3
- AMD EPYC Embedded 7643
- SP3
Memory Type
- AMD EPYC Embedded 7251
- DDR4-2667
- AMD EPYC Embedded 7643
- DDR4-3200
PCIe Lanes
- AMD EPYC Embedded 7251
- 128 lanes
- AMD EPYC Embedded 7643
- 128 lanes
TDP
- AMD EPYC Embedded 7251
- 120 W
- AMD EPYC Embedded 7643
- 225 W
Security Processor
- AMD EPYC Embedded 7251
- Yes
- AMD EPYC Embedded 7643
- Yes
Memory Controller
- AMD EPYC Embedded 7251
- 8 Channel w/ECC
- AMD EPYC Embedded 7643
- 8 Channel w/ECC
USB
- AMD EPYC Embedded 7251
- 4x USB 3.1 Gen1
- AMD EPYC Embedded 7643
- 4x USB 3.0 Gen1
SATA
- AMD EPYC Embedded 7251
- 32
- AMD EPYC Embedded 7643
- 32
Low Speed Interfaces
- AMD EPYC Embedded 7251
- GPIO , I2C , LPC , SMBus , SPI , UART
- AMD EPYC Embedded 7643
- GPIO , I2C , LPC , SMBus , SPI , UART
Which one should you pick?
Choose 7251 if you want the higher PCIe lanes (128 lanes vs 128 lanes) and the higher SATA (32 vs 32).
Choose 7643 if you want the higher L3 cache (256 MB vs 32 MB).