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AMD EPYC 9645 vs AMD EPYC Embedded 9555P: Comparison
What is the difference between EPYC 9645 and EPYC Embedded 9555P?
The gap that matters here is l3 cache: EPYC 9645 384 MB against EPYC Embedded 9555P 256 MB, which puts EPYC 9645 33% ahead. Boost clock is not the same on both, 4.0 GHz on the EPYC 9645 versus 4.4 GHz on the EPYC Embedded 9555P. They differ on tdp too, 370 W on the EPYC 9645 versus 360 W on the EPYC Embedded 9555P. There is a split on core count as well, 96 cores on the EPYC 9645 versus 64 cores on the EPYC Embedded 9555P. Thread count is not the same on both, 192 threads on the EPYC 9645 versus 128 threads on the EPYC Embedded 9555P. They differ on core architecture too, Zen 5c "Turin Dense" on the EPYC 9645 versus Zen 5 on the EPYC Embedded 9555P. There is a split on base clock as well, 2.3 GHz on the EPYC 9645 versus 3.2 GHz on the EPYC Embedded 9555P. Multi-socket support is not the same on both, 1P/2P on the EPYC 9645 versus Single Socket Only on the EPYC Embedded 9555P.
Which should you buy, EPYC 9645 or EPYC Embedded 9555P?
Buy the EPYC 9645 for cloud tenancy and container hosting and dense virtualization at moderate power, though it is the wrong buy for single-thread-sensitive workloads and maximum absolute core count needs. The EPYC Embedded 9555P is the one to take for industrial and embedded system designs and long-lifecycle networking and edge-compute deployments, though it is not built for consumer desktop or gaming builds and DIY PC upgrades. Our rating of the EPYC 9645 (8.7/10): the EPYC 9645 is a solid mid-tier dense-core option for cloud hosts that want more cores per socket without jumping to AMD's largest dense SKUs.
Where the two are identical
The common ground is wider than the gap: memory channels, socket and ecc support are identical here.
Specs and benchmarks
Core Count
- AMD EPYC 9645
- 96 cores
- AMD EPYC Embedded 9555P
- 64 cores
Thread Count
- AMD EPYC 9645
- 192 threads
- AMD EPYC Embedded 9555P
- 128 threads
Core Architecture
- AMD EPYC 9645
- Zen 5c "Turin Dense"
- AMD EPYC Embedded 9555P
- Zen 5
Base Clock
- AMD EPYC 9645
- 2.3 GHz
- AMD EPYC Embedded 9555P
- 3.2 GHz
Boost Clock
- AMD EPYC 9645
- 4.0 GHz
- AMD EPYC Embedded 9555P
- 4.4 GHz
L3 Cache
- AMD EPYC 9645
- 384 MBBest
- AMD EPYC Embedded 9555P
- 256 MB-33%
Socket
- AMD EPYC 9645
- SP5
- AMD EPYC Embedded 9555P
- SP5
Multi-Socket Support
- AMD EPYC 9645
- 1P/2P
- AMD EPYC Embedded 9555P
- Single Socket Only
Memory Channels
- AMD EPYC 9645
- 12 channels
- AMD EPYC Embedded 9555P
- 12 channels
ECC Support
- AMD EPYC 9645
- Yes
- AMD EPYC Embedded 9555P
- Yes
TDP
- AMD EPYC 9645
- 370 W
- AMD EPYC Embedded 9555P
- 360 W
Which one should you pick?
Choose 9645 if you want the higher L3 cache (384 MB vs 256 MB) and the higher memory channels (12 channels vs 12 channels).
Choose 9555P if you already have it on hand or find it at a lower price.
Verdict
AMD EPYC 9645
8.7 / 10 Expert Rating
The EPYC 9645 is a solid mid-tier dense-core option for cloud hosts that want more cores per socket without jumping to AMD's largest dense SKUs.