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AMD EPYC 9555P vs AMD EPYC 9755: Comparison
EPYC 9555P vs EPYC 9755: the l3 cache difference
L3 cache is where these two genuinely part company, EPYC 9555P 256 MB against EPYC 9755 384 MB, a 33% lead for EPYC 9755. Measured rather than claimed: in SPECrate® 2017 Integer (base), 1-chip the EPYC 9755 returns 1,410 against 864, a 39% lead. There is a split on thread count as well, 128 threads on the EPYC 9555P versus 256 threads on the EPYC 9755. They differ on base clock too, 3.2 GHz on the EPYC 9555P versus 2.7 GHz on the EPYC 9755. They differ on multi-socket support too, 1P on the EPYC 9555P versus Dual Socket on the EPYC 9755.
Which should you buy, EPYC 9555P or EPYC 9755?
Buy the EPYC 9555P for datacenter and cloud compute and virtualization-dense server workloads, though it is not the pick for consumer desktop builds and single-threaded latency-sensitive workloads on lower core-count SKUs. The EPYC 9755 suits large-scale enterprise databases and HPC and technical computing at scale, though it is not built for power-constrained deployments and small server rooms. Our rating of the EPYC 9755 (9.4/10): the EPYC 9755 is AMD's most powerful standard-core EPYC SKU, pairing 128 cores with clocks that make few compromises for organizations that can afford the 500W power budget.
What EPYC 9555P and EPYC 9755 have in common
Where they agree, they agree completely, memory channels, pcie lanes, release year, socket and max memory speed included, so the decision does not turn on any of those. They match on 1 further specification as well.
Frequently asked questions
Do the EPYC 9555P and EPYC 9755 differ on boost clock?
Yes. Boost Clock reads Up to 4.4 GHz on the EPYC 9555P versus 4.5 GHz on the EPYC 9755.
Is the PCIe Generation the same on the EPYC 9555P and EPYC 9755?
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 9755
- 2024
Core Count
- AMD EPYC 9555P
- 64 cores
- AMD EPYC 9755
- 128 cores
Thread Count
- AMD EPYC 9555P
- 128 threads
- AMD EPYC 9755
- 256 threads
Base Clock
- AMD EPYC 9555P
- 3.2 GHz
- AMD EPYC 9755
- 2.7 GHz
Boost Clock
- AMD EPYC 9555P
- Up to 4.4 GHz
- AMD EPYC 9755
- 4.5 GHz
L3 Cache
- AMD EPYC 9555P
- 256 MB-33%
- AMD EPYC 9755
- 384 MBBest
Socket
- AMD EPYC 9555P
- SP5
- AMD EPYC 9755
- SP5
Multi-Socket Support
- AMD EPYC 9555P
- 1P
- AMD EPYC 9755
- Dual Socket
Memory Channels
- AMD EPYC 9555P
- 12 channels
- AMD EPYC 9755
- 12 channels
Max Memory Speed
- AMD EPYC 9555P
- 6400 MT/s
- AMD EPYC 9755
- 6400 MT/s
PCIe Lanes
- AMD EPYC 9555P
- 128 lanes
- AMD EPYC 9755
- 128 lanes
PCIe Generation
- AMD EPYC 9555P
- PCIe 5.0
- AMD EPYC 9755
- PCIe 5.0
TDP
- AMD EPYC 9555P
- 360 W
- AMD EPYC 9755
- 500 W
Memory Support
- AMD EPYC 9555P
- DDR5, 12-Channel, Up to 6400 MT/s
- AMD EPYC 9755
- 12-channel ECC DDR5Best
Benchmarks
- General CPU
SPECrate® 2017 Integer (base), 1-chip
- AMD EPYC 9555P
- 864-39%
- AMD EPYC 9755
- 1,410Best
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
- 891-27%
- AMD EPYC 9755
- 1,220Best
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 9755 if you want the higher L3 cache (384 MB vs 256 MB), the higher SPECrate® 2017 integer (base), 1-chip (1,410 vs 864) and the higher SPECrate® 2017 floating point (base), 1-chip (1,220 vs 891).
Verdict
AMD EPYC 9755
9.4 / 10 Expert Rating
The EPYC 9755 is AMD's most powerful standard-core EPYC SKU, pairing 128 cores with clocks that make few compromises for organizations that can afford the 500W power budget.