AMD EPYC 7513 vs AMD Ryzen 9 9955HX Comparison

The AMD EPYC 7513 and AMD Ryzen 9 9955HX occupy opposite ends of the processor spectrum: one is a 32-core server chip built for scale-out workloads, the other a 16-core mobile part designed for portability. Benchmark data from the database shows the EPYC winning 11 of 15 head-to-head tests, with commanding leads in multi-threaded rendering, encryption, and physics. The Ryzen, however, takes the single-thread Passmark crown and a few niche workloads. These results reflect fundamentally different design goals: the EPYC prioritizes core count, cache, and memory bandwidth, while the Ryzen leverages a newer Zen 5 architecture and a much higher boost clock.

Head-to-Head Benchmarks

The EPYC 7513 delivers its most decisive victory in Cinebench R23 single-core, scoring 7119 against the Ryzen's 2174, a 227.5% advantage. That margin is even larger than its 113.4% lead in Cinebench R15 single-core (717 vs 336). In physics simulation, the EPYC posts 5118 versus 2720, an 88.2% gap. Data encryption also heavily favors the EPYC: 63628 vs 37330, a 70.4% lead. Random string sorting shows a 34.4% edge (104660 vs 77890), and prime number finding is 32.4% higher (380 vs 287). Integer math is 28% ahead (272145 vs 212598), data compression 27.4% (932240 vs 731998), and floating point math 11% (151713 vs 136682). The EPYC also wins the overall multithread Passmark test (59331 vs 56171, 5.6%) and Cinebench R23 multi-core (50431 vs 37159, 35.7%).

The Ryzen 9 9955HX counters with a 43.6% lead in Passmark single-thread (4393 vs 2479) and a 2.6% edge in extended instructions (57946 vs 56451). It also wins Cinebench R15 multi-core, scoring 5905 against the EPYC's 5083, a 13.9% margin. These four wins, while fewer, highlight the Ryzen's strength in latency-sensitive and instruction-heavy tasks.

Where Each One Wins

The EPYC 7513 is the clear winner in workloads that scale with core count and memory bandwidth. It dominates Cinebench R23 multi-core, Passmark multithread, integer math, floating point math, data compression, encryption, physics, prime number finding, and random string sorting. These are typical server and workstation tasks: rendering, scientific simulation, database compression, and cryptographic operations. The EPYC's 32 cores and 64 threads, combined with 128 MB of shared L3 cache and eight-channel DDR4 memory, provide the raw throughput needed for such parallel workloads.

The Ryzen 9 9955HX excels in single-threaded performance, as shown by its Passmark single-thread score of 4393, which is 43.6% higher than the EPYC's 2479. It also wins in extended instructions, a category that often reflects SIMD or AVX-512 style operations, and in the older Cinebench R15 multi-core test, where its higher boost clock (5.40 GHz vs 3.65 GHz) likely compensates for fewer cores. For mobile users, the Ryzen's wins in single-thread and instruction-heavy tasks translate to snappier application response and better performance in lightly threaded software.

Architecture Differences

The EPYC 7513 is built on Zen 3 architecture, codenamed Milan, using a 7 nm process from TSMC. It packs 33,200 million transistors across 8 chiplets, each 81 mm². The Ryzen 9 9955HX uses the newer Zen 5 architecture, codenamed Fire Range, on a 4 nm process, with 16,630 million transistors across 2 chiplets of 70.6 mm² each. The process node difference gives the Ryzen a significant efficiency advantage, reflected in its 55 W TDP versus the EPYC's 200 W.

Cache hierarchies differ substantially. The EPYC provides 64 KB of L1 and 512 KB of L2 per core, with a massive 128 MB shared L3. The Ryzen offers 80 KB L1 and 1 MB L2 per core, but only 64 MB of shared L3. The EPYC's larger L3 is a key factor in its multi-threaded dominance, as it reduces memory traffic for server workloads. Memory support also diverges: the EPYC uses DDR4 with an eight-channel bus delivering 204.8 GB/s, while the Ryzen uses DDR5 with a dual-channel bus at 89.6 GB/s. The EPYC's memory bandwidth is more than double, which is critical for data-intensive tasks.

PCIe connectivity is another major split. The EPYC provides 128 Gen 4 lanes (CPU only), while the Ryzen offers 28 Gen 5 lanes. The EPYC's lane count suits multi-GPU and high-speed storage configurations, whereas the Ryzen's Gen 5 lanes offer higher per-lane bandwidth but far fewer total lanes. The Ryzen also includes an integrated Radeon 610M GPU, while the EPYC has none, reflecting its server role where discrete graphics are standard.

Specification Differences

| Specification | AMD EPYC 7513 | AMD Ryzen 9 9955HX |

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

| Cores | 32 | 16 |

| Threads | 64 | 32 |

| Base clock | 2.60 GHz | 2.50 GHz |

| Boost clock | 3.65 GHz | 5.40 GHz |

| TDP | 200 W | 55 W |

| Socket | AMD Socket SP3 | AMD Socket FL1 |

| Architecture | Zen 3 | Zen 5 |

| Process node | 7 nm | 4 nm |

| Transistors | 33,200 million | 16,630 million |

| Die size | 8x 81 mm² | 2x 70.6 mm² |

| L1 cache | 64 KB (per core) | 80 KB (per core) |

| L2 cache | 512 KB (per core) | 1 MB (per core) |

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

| Memory support | DDR4 | DDR5 |

| Memory bus | Eight-channel | Dual-channel |

| Memory bandwidth | 204.8 GB/s | 89.6 GB/s |

| PCIe | Gen 4, 128 Lanes (CPU only) | Gen 5, 28 Lanes (CPU only) |

| Integrated graphics | None | Radeon 610M |

| Market segment | Server/Workstation | Mobile |

| Release date | 2021-03-14 | 2025-01-05 |

| Launch MSRP | $2840 | Not available |

| Multiplier unlocked | No | Yes |

FAQ

Q: Which processor has more cores?

A: The AMD EPYC 7513 has 32 cores and 64 threads, while the Ryzen 9 9955HX has 16 cores and 32 threads.

Q: Which has a higher boost clock?

A: The Ryzen 9 9955HX boosts to 5.40 GHz, compared to the EPYC's 3.65 GHz.

Q: Which supports DDR5 memory?

A: The Ryzen 9 9955HX supports DDR5, while the EPYC 7513 uses DDR4.

Q: Which has higher memory bandwidth?

A: The EPYC 7513 delivers 204.8 GB/s over eight channels, versus the Ryzen's 89.6 GB/s over dual channels.

Q: Which includes integrated graphics?

A: The Ryzen 9 9955HX includes a Radeon 610M iGPU; the EPYC 7513 has none.

Q: Which wins in Cinebench R23 single-core?

A: The EPYC 7513 scores 7119 versus the Ryzen's 2174, a 227.5% lead.

The Verdict

The data points to a clear split: the AMD EPYC 7513 is the processor for server and workstation environments where core count, cache size, and memory bandwidth are paramount. It wins 11 of 15 head-to-head tests, including all major multi-threaded benchmarks except Cinebench R15 multi-core, and its 128 MB L3 cache and 204.8 GB/s memory bandwidth make it ideal for virtualization, database, and scientific workloads. The Ryzen 9 9955HX, with its 5.40 GHz boost clock and Zen 5 architecture, is the choice for mobile systems that need strong single-thread performance and power efficiency, as evidenced by its 55 W TDP and Passmark single-thread lead. The EPYC's 200 W TDP and server socket are not suited for portable use, while the Ryzen's 28 PCIe Gen 5 lanes and integrated GPU cater to laptop designs. Ultimately, the EPYC 7513 is for scale-out compute, the Ryzen 9 9955HX for on-the-go performance.