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AMD EPYC 9555P vs AMD EPYC 9965: Comparison
What is the difference between EPYC 9555P and EPYC 9965?
The gap that matters here is l3 cache: EPYC 9555P 256 MB against EPYC 9965 384 MB, which puts EPYC 9965 33% ahead. Measured rather than claimed: in SPECrate® 2017 Integer (base), 1-chip the EPYC 9965 returns 1,630 against 864, a 47% lead. There is a split on core count as well, 64 cores on the EPYC 9555P versus 192 cores on the EPYC 9965. They differ on thread count too, 128 threads on the EPYC 9555P versus 384 threads on the EPYC 9965. There is a split on base clock as well, 3.2 GHz on the EPYC 9555P versus 2.25 GHz on the EPYC 9965. Multi-socket support is not the same on both, 1P on the EPYC 9555P versus Dual Socket on the EPYC 9965.
Which should you buy, EPYC 9555P or EPYC 9965?
Buy the EPYC 9555P for datacenter and cloud compute and virtualization-dense server workloads, though it is not built for consumer desktop builds and single-threaded latency-sensitive workloads on lower core-count SKUs. The EPYC 9965 is the one to take for extreme-density hyperscale cloud hosting and massive container orchestration clusters, though it is not the pick for small to mid-size deployments and single-thread or latency-sensitive workloads. Our rating of the EPYC 9965 (9.4/10): the EPYC 9965 is AMD's absolute core-count flagship, justified only for the largest hyperscale deployments that can keep 192 cores genuinely busy.
Where the two are identical
The common ground is wider than the gap: memory channels, pcie lanes, release year, socket and max memory speed are identical here. They match on 1 further specification as well.
Frequently asked questions
Do the EPYC 9555P and EPYC 9965 differ on boost clock?
Yes. Boost Clock reads Up to 4.4 GHz on the EPYC 9555P versus 3.7 GHz on the EPYC 9965.
Is the PCIe Generation the same on the EPYC 9555P and EPYC 9965?
It is. Both are listed at PCIe 5.0, so it is not a reason to pick one over the other.
Specs and benchmarks
Release Year
- AMD EPYC 9555P
- 2024
- AMD EPYC 9965
- 2024
Core Count
- AMD EPYC 9555P
- 64 cores
- AMD EPYC 9965
- 192 cores
Thread Count
- AMD EPYC 9555P
- 128 threads
- AMD EPYC 9965
- 384 threads
Base Clock
- AMD EPYC 9555P
- 3.2 GHz
- AMD EPYC 9965
- 2.25 GHz
Boost Clock
- AMD EPYC 9555P
- Up to 4.4 GHz
- AMD EPYC 9965
- 3.7 GHz
L3 Cache
- AMD EPYC 9555P
- 256 MB-33%
- AMD EPYC 9965
- 384 MBBest
Socket
- AMD EPYC 9555P
- SP5
- AMD EPYC 9965
- SP5
Multi-Socket Support
- AMD EPYC 9555P
- 1P
- AMD EPYC 9965
- Dual Socket
Memory Channels
- AMD EPYC 9555P
- 12 channels
- AMD EPYC 9965
- 12 channels
Max Memory Speed
- AMD EPYC 9555P
- 6400 MT/s
- AMD EPYC 9965
- 6400 MT/s
PCIe Lanes
- AMD EPYC 9555P
- 128 lanes
- AMD EPYC 9965
- 128 lanes
PCIe Generation
- AMD EPYC 9555P
- PCIe 5.0
- AMD EPYC 9965
- PCIe 5.0
TDP
- AMD EPYC 9555P
- 360 W
- AMD EPYC 9965
- 500 W
Memory Support
- AMD EPYC 9555P
- DDR5, 12-Channel, Up to 6400 MT/s
- AMD EPYC 9965
- 12-channel ECC DDR5Best
Benchmarks
- General CPU
SPECrate® 2017 Integer (base), 1-chip
- AMD EPYC 9555P
- 864-47%
- AMD EPYC 9965
- 1,630Best
Best published 1-chip result on spec.org, retrieved 23 Sept 2026.
Server-style tasks like compiling and compression on every thread. Best for judging workstation and server work.
SPECrate® 2017 Floating Point (base), 1-chip
- AMD EPYC 9555P
- 891-30%
- AMD EPYC 9965
- 1,270Best
Best published 1-chip result on spec.org, retrieved 23 Sept 2026.
Scientific and engineering tasks on every thread. Rewards core count and memory bandwidth.
SPEC®, SPECrate® and SPECspeed® are registered trademarks of the Standard Performance Evaluation Corporation. Copied by permission of the Standard Performance Evaluation Corporation (SPEC). Results retrieved from www.spec.org on 23 Sept 2026.
Which one should you pick?
Choose 9555P if you want the higher memory channels (12 channels vs 12 channels) and the higher PCIe lanes (128 lanes vs 128 lanes).
Choose 9965 if you want the higher L3 cache (384 MB vs 256 MB), the higher SPECrate® 2017 integer (base), 1-chip (1,630 vs 864) and the higher SPECrate® 2017 floating point (base), 1-chip (1,270 vs 891).
Verdict
AMD EPYC 9965
9.4 / 10 Expert Rating
The EPYC 9965 is AMD's absolute core-count flagship, justified only for the largest hyperscale deployments that can keep 192 cores genuinely busy.