AMD EPYC 9555P vs AMD Ryzen Threadripper 9980X Comparison

Both AMD processors share the same 64-core, 128-thread Zen 5 foundation, yet the benchmark data reveals two distinctly different personalities. The Ryzen Threadripper 9980X and EPYC 9555P are built on identical silicon but tuned for different arenas, and the numbers paint a clear picture of where each excels. This analysis digs into the head-to-head results, architectural choices, and what those differences mean for real-world workloads.

Head-to-Head Benchmarks

The Ryzen Threadripper 9980X dominates the benchmark suite, winning 15 of 17 tests. Its most decisive victory comes in PassMark's single-thread test, where it scores 4,537 against the EPYC's 3,410—a 33% advantage. This gap is consistent across Cinebench single-core tests, with the Threadripper leading by 13.3-13.4% in both R15 (1,857 vs 1,638) and R23 (18,427 vs 16,261). The trend suggests the Threadripper's higher boost clock of 5.40 GHz, compared to the EPYC's 4.40 GHz, directly translates into superior per-thread performance.

Multi-core workloads tell a similar story, though the margins are smaller. In Cinebench R23 multi-core, the Threadripper scores 130,529 against the EPYC's 115,186, a 13.3% lead. The pattern repeats in R20 (54,822 vs 48,378) and R15 (13,157 vs 11,610), all showing the same 13.3% delta. PassMark's multithread test shows a 14.6% advantage (141,641 vs 123,576), while floating-point math favors the Threadripper by 14.9% (559,003 vs 486,407). Extended instructions show an even larger 19.8% gap (228,959 vs 191,082), suggesting the Threadripper handles complex instruction sets more efficiently.

However, the EPYC 9555P claims two notable wins. The most dramatic is PassMark physics, where it scores 15,474 versus the Threadripper's 8,001—a 48.3% difference that is the largest margin in either direction. The EPYC also wins at finding prime numbers, scoring 1,067 against 769, a 27.9% advantage. These results hint at workload-specific optimizations that favor the server platform.

Data compression and encryption show closer contests. The Threadripper leads compression by 12.7% (2,974,534 vs 2,639,400) and encryption by a narrower 5.5% (157,137 vs 148,896). Random string sorting is nearly even, with the Threadripper ahead by just 4.2% (292,083 vs 280,398). Integer math favors the Threadripper by 10.8% (872,071 vs 787,106).

Architecture Differences

Both processors are built on TSMC's 4 nm node with 66,520 million transistors spread across eight 70.6 mm² dies. The architecture is Zen 5 for both, but the cache configurations differ slightly. The Threadripper allocates 64 KB of L1 cache per core, while the EPYC provides 80 KB per core. Both share 1 MB of L2 per core and 256 MB of L3, though the EPYC's L3 is explicitly labeled as shared.

The most significant architectural divergence lies in memory and I/O. The Threadripper uses quad-channel DDR5 with 204.8 GB/s bandwidth, while the EPYC employs twelve-channel DDR5 delivering 576.0 GB/s—nearly three times the memory bandwidth. This difference directly explains the EPYC's physics benchmark victory, as those workloads often depend heavily on memory throughput. PCIe connectivity also differs: the Threadripper offers 80 Gen 5 lanes, while the EPYC provides 128 Gen 5 lanes.

Socket and platform choices further separate them. The Threadripper uses AMD Socket sTR5, while the EPYC uses Socket SP5. The Threadripper has an unlocked multiplier, enabling overclocking, whereas the EPYC is locked. TDP ratings are close but not identical: 350 W for the Threadripper versus 360 W for the EPYC.

FAQ

Q: Why does the Ryzen Threadripper 9980X win most benchmarks despite having the same core count as the EPYC 9555P?

A: The primary driver is clock speed. The Threadripper boosts to 5.40 GHz compared to the EPYC's 4.40 GHz, which explains its consistent 13.3% lead across Cinebench multi-core tests and its 33% advantage in PassMark single-thread performance.

Q: The EPYC 9555P wins PassMark physics by 48.3%. What explains this dramatic result?

A: The EPYC's twelve-channel memory configuration provides 576.0 GB/s of bandwidth compared to the Threadripper's quad-channel 204.8 GB/s. Physics simulations often scale with memory throughput, making this a platform-specific advantage.

Q: Are these processors identical under the hood?

A: Both use Zen 5 architecture on TSMC's 4 nm process with 66,520 million transistors and 8x 70.6 mm² dies. However, the EPYC has 80 KB of L1 cache per core versus the Threadripper's 64 KB, and their memory controllers and PCIe lane counts differ significantly.

Q: Which processor has better single-threaded performance?

A: The Threadripper 9980X is decisively ahead, scoring 4,537 in PassMark single-thread against the EPYC's 3,410 (33% higher). Cinebench R23 single-core confirms this with 18,427 versus 16,261.

Q: Can the EPYC 9555P be overclocked?

A: No, the EPYC has a locked multiplier. The Threadripper 9980X has an unlocked multiplier, allowing users to adjust clock speeds beyond its stock 5.40 GHz boost.

Q: How do these processors compare in memory-intensive tasks?

A: The EPYC's 576.0 GB/s memory bandwidth is 2.8 times the Threadripper's 204.8 GB/s. This makes the EPYC preferable for workloads that saturate memory channels, even though the Threadripper wins most compute-bound benchmarks.

Specification Differences

| Specification | Ryzen Threadripper 9980X | EPYC 9555P |

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

| Base Clock | 3.20 GHz | 3.20 GHz |

| Boost Clock | 5.40 GHz | 4.40 GHz |

| TDP | 350 W | 360 W |

| Socket | AMD Socket sTR5 | AMD Socket SP5 |

| Codename | Shimada Peak | Turin |

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

| Memory Bus | Quad-channel | Twelve-channel |

| Memory Bandwidth | 204.8 GB/s | 576.0 GB/s |

| PCIe Lanes | 80 (Gen 5) | 128 (Gen 5) |

| Market Segment | Desktop | Server/Workstation |

| Release Date | 2025-07-29 | 2024-10-09 |

| Launch MSRP | $4999 | $7983 |

| Multiplier | Unlocked | Locked |

| Part Number | 100-000001593 | 100-000001523 |

Where Each One Wins

The Ryzen Threadripper 9980X is the clear winner for compute-bound tasks that favor high clock speeds and per-core efficiency. Its 33% single-thread advantage makes it superior for applications with serial components, while its 13.3% multi-core lead in Cinebench positions it well for rendering, video encoding, and general productivity workloads. The 19.8% edge in extended instructions suggests it handles complex computational workloads more effectively.

The EPYC 9555P wins where memory bandwidth matters most. Its 576.0 GB/s throughput, triple the Threadripper's, drives its 48.3% physics benchmark victory. The 27.9% advantage in prime number finding also indicates strength in integer-heavy, memory-latency-sensitive tasks. Server workloads that involve large datasets, virtualization, or database operations would likely benefit from the EPYC's twelve-channel memory architecture and 128 PCIe lanes.

The Threadripper also offers overclocking flexibility with its unlocked multiplier, allowing users to push beyond its already higher 5.40 GHz boost clock. The EPYC's locked multiplier and higher TDP suggest it's optimized for sustained server operation rather than peak performance tuning.

The Verdict

The data presents a clear choice based on workload priorities. The Ryzen Threadripper 9980X is the performance leader across the vast majority of benchmarks, winning 15 of 17 tests with advantages ranging from 4.2% to 33%. Its higher boost clock and unlocked multiplier make it the pick for users who need maximum throughput in rendering, content creation, and general high-performance computing—tasks where Cinebench and PassMark compute scores are the best predictors.

The EPYC 9555P is the specialist that wins where memory bandwidth is the bottleneck. Its 576.0 GB/s bandwidth and 128 PCIe lanes make it the data-driven choice for server environments handling massive datasets, virtualization, or scientific simulations. The physics benchmark's 48.3% margin is not an anomaly; it's a signal that memory-dependent workloads will see substantial benefits.

Users should also consider the platform implications. The Threadripper's desktop segment positioning and unlocked multiplier suit enthusiast workstations, while the EPYC's server segment and locked multiplier target reliability in data centers. The Threadripper's launch MSRP of $4999 is lower than the EPYC's $7983, but the EPYC's release date precedes the Threadripper by nearly a year, reflecting different market timing.

In essence, choose the Threadripper 9980X for raw compute performance and flexibility, or the EPYC 9555P for memory-bound server workloads where its bandwidth advantage translates directly to results.