AMD EPYC 4565P vs AMD Ryzen 9 9955HX3D Comparison

Head-to-Head Benchmarks

The benchmark data reveals a clear split between these two 16-core, 32-thread Zen 5 processors. The AMD EPYC 4565P wins 11 of the 15 head-to-head comparisons, while the AMD Ryzen 9 9955HX3D takes 4. The overall average benchmark scores are close — the Ryzen posts 97,453 against the EPYC’s 95,764, a 1.8% margin in the Ryzen’s favor according to the nearestRivals data. But that aggregate figure masks how differently these chips perform depending on the workload.

The most dramatic single-core results belong to the EPYC 4565P. In Cinebench R23 single-core, the EPYC scores 7,680 versus the Ryzen’s 2,159.5, a 71.9% advantage for the EPYC. The Cinebench R15 single-core test tells a similar story: 774 for the EPYC versus 332 for the Ryzen, a 57.1% gap. These are enormous deltas, and they align with the clock speed difference — the EPYC boosts to 5.70 GHz while the Ryzen tops out at 5.40 GHz. The PassMark single-thread results are closer, with the EPYC ahead by 4.3% (4,712 versus 4,511), but the Cinebench numbers dominate the narrative.

Multi-core performance flips direction depending on the benchmark. In Cinebench R23 multi-core, the EPYC wins decisively with 54,405 versus 38,161.5, a 29.9% advantage. However, in Cinebench R15 multi-core, the Ryzen wins 6,042.5 to 5,484, a 10.2% margin. This inconsistency suggests the two chips handle sustained multi-threaded loads differently, with the EPYC pulling ahead in the longer, more demanding R23 workload.

PassMark results favor the EPYC in most categories. Data compression goes to the EPYC by 8.7% (860,786 versus 785,811). Data encryption shows an 18.3% EPYC lead (48,268 versus 39,446). Integer math favors the EPYC by 11.2% (250,683 versus 222,503). Floating-point math is closer, with the EPYC ahead 5.2% (152,003 versus 144,122). Extended instructions see a modest 2.4% EPYC edge (64,345 versus 62,813). Even the multithread aggregate score goes to the EPYC, though narrowly: 63,474 versus 62,674, a 1.3% margin.

The Ryzen’s wins are more specialized but striking. In PassMark find prime numbers, the Ryzen scores 525 against the EPYC’s 294, a 78.6% advantage. PassMark physics shows a 57.5% Ryzen lead (4,687 versus 2,976). Random string sorting goes to the Ryzen by a slim 2.7% (83,497 versus 81,318). These results indicate the Ryzen’s larger L3 cache — 128 MB versus 64 MB — provides a significant edge in certain cache-sensitive and physics-style workloads.

FAQ

Q: Which processor has the higher average benchmark score?

A: The AMD Ryzen 9 9955HX3D has an average benchmark score of 97,453, which is 1.8% higher than the AMD EPYC 4565P’s 95,764. Both chips sit at the 96th percentile among all CPUs.

Q: Why does the EPYC 4565P win so many single-core benchmarks?

A: The EPYC 4565P has a higher boost clock at 5.70 GHz compared to the Ryzen 9 9955HX3D’s 5.40 GHz. This is reflected in the Cinebench R23 single-core test, where the EPYC leads by 71.9%, and the Cinebench R15 single-core test, where it leads by 57.1%.

Q: Does the Ryzen 9 9955HX3D win any multi-core tests?

A: Yes. In Cinebench R15 multi-core, the Ryzen wins with 6,042.5 points versus the EPYC’s 5,484, a 10.2% advantage. However, in Cinebench R23 multi-core, the EPYC wins decisively with 54,405 points versus 38,161.5, a 29.9% lead.

Q: What is the biggest single benchmark margin between these two chips?

A: The largest margin is in PassMark find prime numbers, where the Ryzen 9 9955HX3D scores 525 versus the EPYC 4565P’s 294, a 78.6% advantage for the Ryzen.

Q: How do the two chips compare in memory bandwidth?

A: Both processors support DDR5 memory with dual-channel buses and identical 89.6 GB/s memory bandwidth. Both also support ECC memory.

Q: Which chip has more L3 cache?

A: The Ryzen 9 9955HX3D has 128 MB of L3 cache, while the EPYC 4565P has 64 MB of shared L3 cache. Both have 80 KB of L1 cache per core and 1 MB of L2 cache per core.

Architecture Differences

Both processors are built on the same foundational architecture: Zen 5, fabricated on TSMC’s 4 nm process node with 16,630 million transistors and a die size of 2x 70.6 mm². The similarities extend to memory support — both use DDR5 with dual-channel buses and 89.6 GB/s bandwidth, and both support ECC memory.

The key architectural divergence lies in the L3 cache. The Ryzen 9 9955HX3D features 128 MB of L3 cache, double the EPYC 4565P’s 64 MB shared L3. This cache advantage is the defining architectural trait of the Ryzen part, which belongs to the Fire Range codename within the 9000 series. The EPYC 4565P, under the Grado codename in the EPYC 4005 series, relies on a smaller cache but compensates with higher clock speeds.

Clock configurations differ substantially. The EPYC’s base clock is 4.30 GHz with a 5.70 GHz boost, while the Ryzen operates at a 2.50 GHz base and 5.40 GHz boost. The EPYC’s higher base clock — 1.80 GHz above the Ryzen — explains its dominance in sustained workloads that don’t require turbo boosting. The Ryzen’s lower base clock reflects its mobile market positioning and 55W TDP, against the EPYC’s 170W TDP.

Socket and platform differences are significant. The Ryzen uses AMD Socket FL1, while the EPYC uses AMD Socket AM5. PCIe connectivity varies: the Ryzen provides Gen 5 with 28 lanes (CPU only), while the EPYC provides Gen 5 with 24 lanes (CPU only). Integrated graphics differ as well — the Ryzen includes Radeon 610M, while the EPYC includes a generic Radeon Graphics solution.

The multiplier is unlocked on the Ryzen 9 9955HX3D, enabling overclocking, while the EPYC 4565P has a locked multiplier. The Ryzen also carries a different part number (100-000001030 versus 100-000001559) and targets the mobile segment, while the EPYC targets server/workstation use.

The Verdict

The data supports a clear performance hierarchy based on workload type. The AMD EPYC 4565P is the stronger all-around performer, winning 11 of 15 head-to-head benchmarks. Its single-core dominance is overwhelming — 71.9% ahead in Cinebench R23 single-core and 57.1% ahead in Cinebench R15 single-core. For multi-core rendering, the EPYC’s Cinebench R23 result is 29.9% higher. In data-centric tasks like compression, encryption, integer math, and floating-point math, the EPYC leads by margins ranging from 2.4% to 18.3%.

The AMD Ryzen 9 9955HX3D should be chosen for workloads that exploit its large L3 cache. Its 78.6% lead in prime number finding and 57.5% lead in physics benchmarks demonstrate clear advantages in cache-sensitive algorithms. The Ryzen also wins the Cinebench R15 multi-core test by 10.2%, suggesting it handles shorter multi-threaded bursts efficiently. Its 55W TDP versus the EPYC’s 170W makes it the more power-efficient option, and its unlocked multiplier offers overclocking flexibility that the EPYC lacks.

For users prioritizing single-thread performance, data processing, or sustained multi-core rendering, the EPYC 4565P is the data-backed choice. For those running cache-heavy workloads, physics simulations, or prime-number computations, the Ryzen 9 9955HX3D delivers superior results. The EPYC sells with a launch MSRP of $589; the Ryzen has no listed launch MSRP in the data.

Specification Differences

| Specification | AMD Ryzen 9 9955HX3D | AMD EPYC 4565P |

|---|---|---|

| Series | 9000 series | EPYC 4005 series |

| Base Clock | 2.50 GHz | 4.30 GHz |

| Boost Clock | 5.40 GHz | 5.70 GHz |

| TDP | 55W | 170W |

| Socket | AMD Socket FL1 | AMD Socket AM5 |

| Codename | Fire Range | Grado |

| L3 Cache | 128 MB | 64 MB (shared) |

| PCIe | Gen 5, 28 Lanes (CPU only) | Gen 5, 24 Lanes (CPU only) |

| Integrated Graphics | Radeon 610M | Radeon Graphics |

| Market Segment | Mobile | Server/Workstation |

| Release Date | 2025-01-05 | 2025-05-12 |

| Launch MSRP | None listed | $589 |

| Multiplier Unlocked | Yes | No |

| Part Number | 100-000001030 | 100-000001559 |

Where Each One Wins

The EPYC 4565P wins in scenarios requiring high clock speeds and sustained throughput. Its 5.70 GHz boost clock delivers best-in-class single-core results, making it the pick for lightly threaded applications, database queries, and responsiveness in interactive workloads. The 29.9% lead in Cinebench R23 multi-core positions it for long-duration rendering tasks. Data compression, encryption, integer math, and floating-point workloads all favor the EPYC, with margins from 2.4% to 18.3%. Its 170W TDP indicates it can sustain high performance under load, suited for server and workstation environments where power is less constrained.

The Ryzen 9 9955HX3D wins in cache-dependent and latency-sensitive workloads. The 78.6% advantage in prime number finding and 57.5% lead in physics benchmarks suggest its 128 MB L3 cache accelerates algorithms that repeatedly access large datasets. Random string sorting, with a 2.7% edge, benefits similarly. The Cinebench R15 multi-core win by 10.2% hints at strong short-burst multi-threaded performance. Its 55W TDP and mobile form factor make it suitable for high-performance laptops where power efficiency matters. The unlocked multiplier allows users to push performance further, and the 28 PCIe Gen 5 lanes provide more CPU-direct expansion compared to the EPYC’s 24 lanes.