AMD EPYC 9455P vs AMD EPYC 9565 Comparison
AMD EPYC 9455P
EPYC 9565
PERFORMANCE BENCHMARKS
Analysis: AMD EPYC 9455P vs AMD EPYC 9565
FAQ
Q: Which processor wins more benchmark tests in this comparison?
A: The AMD EPYC 9565 wins 15 of the 17 recorded head-to-head tests. The AMD EPYC 9455P wins only two tests, both of which are the single-thread PassMark measurements.
Q: How large is the performance gap in multi-threaded workloads?
A: In Cinebench R23 multi-core, the AMD EPYC 9565 scores 114,937 versus 99,206 for the AMD EPYC 9455P, a 15.9% advantage. The PassMark multi-thread score shows a 15.6% lead, with 135,221 versus 116,927.
Q: Does the AMD EPYC 9455P win any compute-heavy tests?
A: No. The AMD EPYC 9455P only takes the PassMark single-thread test, scoring 3,745 versus 3,696 for the AMD EPYC 9565, a 1.3% edge. All other tests, including encryption, floating point math, integer math, and physics, go to the AMD EPYC 9565.
Q: Are there any tests where the AMD EPYC 9565 has a particularly dominant margin?
A: Yes. The largest single delta is in PassMark find prime numbers, where the AMD EPYC 9565 scores 2,422 versus 1,107, a 118.8% advantage. Extended instructions also show a 52.4% lead, and floating point math shows a 53.6% lead.
Q: How do the two processors compare in overall average benchmark scores?
A: The AMD EPYC 9565 has an average benchmark score of 285,471, while the AMD EPYC 9455P averages 217,854. The AMD EPYC 9565 also ranks at the 99th percentile versus all CPUs, matching the AMD EPYC 9455P's percentile.
Q: What is the launch MSRP difference between the two?
A: The AMD EPYC 9565 has a launch MSRP of $10,486, and the AMD EPYC 9455P has a launch MSRP of $4,819. Both are listed as active production parts from the EPYC 9005 series.
Architecture Differences
Both processors are built on the same Zen 5 architecture, codenamed Turin, using a 4 nm process from TSMC. They share the same AMD Socket SP5, support DDR5 memory across a twelve-channel bus, and each offers 128 PCIe Gen 5 lanes (CPU only). Neither has integrated graphics, and both are unlocked for multiplier adjustments, though the database records them as not multiplier unlocked.
The core counts differ substantially. The AMD EPYC 9565 has 72 cores and 144 threads, while the AMD EPYC 9455P has 48 cores and 96 threads. This core disparity directly drives most multi-threaded performance differences. The base clock is identical at 3.15 GHz for both, but the boost clock differs: 4.30 GHz for the AMD EPYC 9565 and 4.40 GHz for the AMD EPYC 9455P. The higher boost on the smaller part explains why it wins the single-thread PassMark test.
Cache hierarchy also separates the two. Both have 80 KB of L1 cache per core and 1 MB of L2 per core. The shared L3 cache is 384 MB on the AMD EPYC 9565 versus 256 MB on the AMD EPYC 9455P. The transistor count scales with core count: 99,780 million transistors on the AMD EPYC 9565 across 12 compute dies, each 70.6 mm², versus 66,520 million transistors on the AMD EPYC 9455P across 8 dies of the same size. The thermal design power reflects this: 400 W for the AMD EPYC 9565 and 300 W for the AMD EPYC 9455P. Memory bandwidth is identical at 576.0 GB/s, and both support ECC memory.
The release date is the same for both, October 9, 2024. The part numbers differ: 100-000001447 for the AMD EPYC 9565 and 100-000001563 for the AMD EPYC 9455P. Both target the server and workstation market segment and are currently marked as active production parts.
Head-to-Head Benchmarks
The Cinebench suite shows a consistent pattern across R15, R20, and R23. In every multi-core test, the AMD EPYC 9565 leads by 15.9%. For Cinebench R15 multi-core, the scores are 11,585 versus 9,999. R20 multi-core shows 48,273 versus 41,666. R23 multi-core climbs to 114,937 versus 99,206. The single-core Cinebench results follow the same trend: R15 single-core is 1,635 versus 1,411, R20 single-core is 6,814 versus 5,882, and R23 single-core is 16,226 versus 14,005. All these single-core deltas are 15.8% to 15.9%. This is notable because the AMD EPYC 9455P has a higher boost clock, yet the AMD EPYC 9565 still wins the Cinebench single-core tests, suggesting the larger cache or core topology has an effect.
PassMark tests reveal where the AMD EPYC 9565 stretches its lead. Data compression shows a 33.7% advantage, with 2,579,631 versus 1,928,897. Data encryption is 23% ahead, at 141,936 versus 115,403. Extended instructions produce a 52.4% gap: 209,595 versus 137,485. The prime number test is the outlier at 118.8%, a 2,422 to 1,107 result. Floating point math favors the AMD EPYC 9565 by 53.6%, scoring 549,422 versus 357,783. Integer math shows a smaller 18.4% lead, 717,948 versus 606,239. Random string sorting is 20.3% ahead, and physics is a modest 4.2% ahead, 18,036 versus 17,315.
The only two wins for the AMD EPYC 9455P come from the identical PassMark single-thread and single-thread tests, both scoring 3,745 versus 3,696. The delta is 1.3%, a narrow margin that does not offset the comprehensive losses elsewhere. The average benchmark score difference is substantial: 285,471 versus 217,854, representing a 31% gap in overall aggregate performance.
The Verdict
The data points to a clear performance hierarchy. The AMD EPYC 9565 is the stronger processor in nearly every measured category. Its 72 cores and 384 MB of L3 cache deliver decisive wins in multi-threaded, encryption, and math-intensive workloads. The 15.9% Cinebench multi-core lead and the 52%+ margins in extended instructions and floating point math are not marginal differences; they represent a substantial throughput advantage for servers running parallel compute tasks.
The AMD EPYC 9455P holds only one meaningful advantage: a 1.3% higher single-thread PassMark score. That is a narrow edge, likely attributable to its 4.40 GHz boost clock versus 4.30 GHz on the AMD EPYC 9565. For workloads that are strictly single-threaded and latency-sensitive, the AMD EPYC 9455P offers a slight edge, but the difference is small enough that it would rarely dictate a platform choice.
The AMD EPYC 9565 also has a larger cache footprint (384 MB versus 256 MB) and more transistors, which aligns with its higher average benchmark score of 285,471 versus 217,854. Both parts share the same memory bandwidth, PCIe lane count, and socket, so platform compatibility is not a differentiator. The choice reduces to core count versus clock speed. The AMD EPYC 9565 wins on core count and cache; the AMD EPYC 9455P wins on boost clock and a single PassMark test.
For buyers prioritizing raw parallel throughput, the AMD EPYC 9565 is the data-backed choice. For buyers with workloads that are overwhelmingly single-threaded, the AMD EPYC 9455P provides a marginal single-thread win, but the broader benchmark record favors the AMD EPYC 9565.
Specification Differences
The two processors differ in several recorded specifications. Core count is 72 versus 48, and thread count is 144 versus 96. Boost clock is 4.30 GHz on the AMD EPYC 9565 versus 4.40 GHz on the AMD EPYC 9455P. Thermal design power is 400 W versus 300 W. Transistor count is 99,780 million versus 66,520 million. The number of compute dies is 12 versus 8, with each die at 70.6 mm². Shared L3 cache is 384 MB versus 256 MB. Launch MSRP is $10,486 versus $4,819. Part numbers differ: 100-000001447 versus 100-000001563.
Fields that are identical include base clock (3.15 GHz), socket (AMD Socket SP5), architecture (Zen 5), codename (Turin), process node (4 nm), foundry (TSMC), L1 cache (80 KB per core), L2 cache (1 MB per core), memory support (DDR5), memory bus (twelve-channel), memory bandwidth (576.0 GB/s), ECC support (true), PCIe lanes (Gen 5, 128 lanes CPU only), integrated graphics (N/A), market segment (Server/Workstation), production status (Active), release date (October 9, 2024), and multiplier unlock status (false).
Where Each One Wins
The AMD EPYC 9565 wins in all multi-threaded and most single-threaded workloads. The Cinebench suite, across R15, R20, and R23, shows consistent 15.9% leads in multi-core and 15.8% to 15.9% leads in single-core. PassMark tests for data compression, encryption, extended instructions, prime numbers, floating point math, integer math, multi-thread, physics, and random string sorting all go to the AMD EPYC 9565. The margins range from 4.2% in physics to 118.8% in prime numbers. This makes the AMD EPYC 9565 the clear pick for server virtualization, database processing, scientific computing, and any workload that scales across many cores.
The AMD EPYC 9455P wins only the PassMark single-thread test, with a 1.3% advantage. That makes it a narrow choice for workloads that are strictly single-threaded and cannot utilize additional cores. Its lower 300 W TDP may also be relevant for dense server deployments where thermal envelopes are constrained, though the database does not record thermal performance beyond the TDP figures. For everything else, the AMD EPYC 9565's benchmark record is dominant. The 118.8% lead in prime numbers and 52.4% lead in extended instructions specifically indicate workloads involving cryptography, number theory, and SIMD-heavy code will see outsized gains on the AMD EPYC 9565.