AMD EPYC 9684X vs AMD EPYC 9965 Comparison

Head-to-Head Benchmarks

The benchmark comparison between the AMD EPYC 9965 and the AMD EPYC 9684X is dominated by the newer part, but not uniformly so. Across the recorded head-to-head tests, the EPYC 9965 claims 15 wins, while the EPYC 9684X takes 2. The margins, however, tell a more nuanced story than the raw win count.

In Cinebench testing, the EPYC 9965 is consistently ahead by exactly 32.2% across all six recorded variants. The R15 multicore score of 13,775 versus 10,418, the R20 multicore score of 57,397 versus 43,409, and the R23 multicore score of 136,661 versus 103,355 all reflect the same relative gap. The single-core results follow the identical pattern: R15 single-core at 1,944 versus 1,470, R20 single-core at 8,103 versus 6,128, and R23 single-core at 19,293 versus 14,591. This uniform delta suggests a consistent architectural advantage per clock and per core, not merely a core-count scaling effect.

The PassMark suite reveals where the EPYC 9965 truly separates itself. Floating point math shows the largest margin at 144.3%, with scores of 1,153,453 versus 472,174. Integer math follows at 128.2%, recording 1,926,069 versus 844,145. Extended instructions deliver a 115.4% advantage (383,298 versus 177,956), and data compression is 110.5% ahead (5,679,990 versus 2,698,807). Data encryption shows a 95.3% edge (348,449 versus 178,453). Random string sorting is 81.3% higher at 633,030 versus 349,126. The PassMark multithread score is 32% higher at 160,542 versus 121,595, matching the Cinebench delta almost exactly.

Single-thread performance is closer. The EPYC 9965 posts 3,176 versus 2,891 in PassMark single-thread, a 9.9% advantage. This modest gap indicates that the older Zen 4 design remains competitive on a per-thread basis, while the larger differences in multithreaded and math-heavy workloads stem from the 9965's substantially higher core count.

The EPYC 9684X does win two tests, and both are worth examining. In PassMark find prime numbers, it scores 2,020 versus 1,208, a 40.2% advantage. This is a striking reversal, given the 9965's dominance elsewhere. The physics test also goes to the 9684X, with 24,686 versus 18,707, a 24.2% edge. These results suggest that the 9684X's massive L3 cache, 1,152 MB shared, provides a tangible benefit in specific workloads that are sensitive to cache capacity and latency.

The average benchmark score in the database reinforces the overall picture. The EPYC 9965 sits at 620,487, while the EPYC 9684X averages 266,914. The 9965 ranks at the 100th percentile of all CPUs, while the 9684X sits at the 99th. The nearest rivals for the 9965 include the EPYC 9845 at 523,613 (18.5% lower), the EPYC 9755 at 505,778 (22.7% lower), the EPYC 9745 at 425,973 (45.7% lower), and the Ryzen Threadripper PRO 9995WX at 412,068 (50.6% lower). The 9684X's nearest rivals are closer: the Ryzen Threadripper 9970X at 279,778 (4.6% higher), the Intel Xeon 6780E at 280,438 (4.8% higher), the Intel Xeon 6980P at 251,516 (6.1% lower), and the AMD EPYC 9565 at 285,471 (6.5% higher). The 9684X is therefore competitive within its immediate class, while the 9965 stands alone at the top of the database.

Architecture Differences

The two processors represent different generations of AMD's EPYC line. The EPYC 9965 belongs to the EPYC 9005 series, built on Zen 5 architecture with the codename Turin. The EPYC 9684X is part of the EPYC 9004 series, using Zen 4 architecture with the codename Genoa-X. The fabrication process differs as well: the 9965 is produced on a 3 nm node, while the 9684X uses 5 nm. Both are manufactured by TSMC.

The core counts diverge sharply. The EPYC 9965 has 192 cores and 384 threads, while the EPYC 9684X has 96 cores and 192 threads. This is a doubling of cores and threads, which largely explains the multithreaded benchmark dominance of the newer part. The 9965's base clock is 2.25 GHz and boost clock is 3.70 GHz. The 9684X has a higher base clock at 2.55 GHz but the same 3.70 GHz boost. The thermal design power reflects the core count difference: 500 W for the 9965 versus 400 W for the 9684X.

Cache configurations are a central differentiator. The 9965 has 80 KB of L1 cache per core, 1 MB of L2 per core, and 384 MB of shared L3 cache. The 9684X has 64 KB of L1 per core, 1 MB of L2 per core, and a much larger 1,152 MB of shared L3 cache. The 9684X's L3 is three times larger, a consequence of its 3D V-Cache design. This explains its wins in cache-sensitive tests like prime number finding and physics. The 9684X also has published transistor and die size figures: 135,240 million transistors across 12 dies of 72 mm² each. The 9965 has no such figures recorded in the database.

Both processors share the same socket, AMD Socket SP5, and both support DDR5 memory with a twelve-channel memory bus. The memory bandwidth differs: the 9965 delivers 576.0 GB/s, while the 9684X delivers 460.8 GB/s. Both support ECC memory. PCIe connectivity is identical on paper: Gen 5 with 128 lanes (CPU only). The 9965 has no integrated graphics; the 9684X's integrated graphics field is not recorded. Both have locked multipliers.

The release dates place them roughly a year and a half apart. The 9684X launched on 2023-06-12, while the 9965 launched on 2024-10-09. Both remain in active production. The part numbers differ: 100-000000976 for the 9965 and 100-100000892 for the 9684X.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 9965 has 192 cores and 384 threads, exactly double the 96 cores and 192 threads of the AMD EPYC 9684X.

Q: Why does the EPYC 9684X win the PassMark find prime numbers test despite losing most other benchmarks?

A: The 9684X has 1,152 MB of shared L3 cache, three times the 384 MB of the 9965. Prime number finding is cache-sensitive, so the larger cache gives the 9684X a 40.2% advantage in that specific workload.

Q: What is the memory bandwidth difference between the two?

A: The EPYC 9965 supports 576.0 GB/s of memory bandwidth, while the EPYC 9684X supports 460.8 GB/s. Both use DDR5 with a twelve-channel memory bus.

Q: How do the launch dates compare?

A: The EPYC 9684X launched on 2023-06-12, and the EPYC 9965 launched on 2024-10-09. Both processors are currently listed as active in production.

Q: Are the single-core scores close between the two?

A: The EPYC 9965 leads in single-core performance but by a smaller margin than in multicore tests. PassMark single-thread shows 3,176 versus 2,891, a 9.9% advantage. Cinebench R23 single-core shows 19,293 versus 14,591, a 32.2% advantage.

Q: Do both processors use the same socket and PCIe configuration?

A: Yes, both use AMD Socket SP5 and support Gen 5 PCIe with 128 lanes (CPU only). Both also support ECC memory.

Specification Differences

| Specification | AMD EPYC 9965 | AMD EPYC 9684X |

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

| Series | EPYC 9005 series | EPYC 9004 series |

| Architecture | Zen 5 | Zen 4 |

| Codename | Turin | Genoa-X |

| Process node | 3 nm | 5 nm |

| Cores | 192 | 96 |

| Threads | 384 | 192 |

| Base clock | 2.25 GHz | 2.55 GHz |

| Boost clock | 3.70 GHz | 3.70 GHz |

| TDP | 500 W | 400 W |

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

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

| L3 cache | 384 MB (shared) | 1,152 MB (shared) |

| Memory bandwidth | 576.0 GB/s | 460.8 GB/s |

| Transistors | Not recorded | 135,240 million |

| Die size | Not recorded | 12x 72 mm² |

| Release date | 2024-10-09 | 2023-06-12 |

| Launch MSRP | $14813 | $14756 |

| Part number | 100-000000976 | 100-100000892 |

| Average benchmark score | 620,487 | 266,914 |

| Percentile vs all CPUs | 100 | 99 |

The table highlights the key differences: core count, process node, cache size, memory bandwidth, and release timing. The clock speeds are identical at boost, and the 9684X actually has a higher base clock. The L3 cache difference is the most striking architectural contrast, with the 9684X offering triple the capacity.

Where Each One Wins

The AMD EPYC 9965 is the clear choice for workloads that scale with core count and raw compute throughput. Its 192 cores and 384 threads deliver a 32.2% advantage across all Cinebench tests, both single and multicore. In PassMark, the margins expand dramatically in compute-heavy categories: floating point math is 144.3% higher, integer math is 128.2% higher, and extended instructions are 115.4% higher. Data compression and encryption workloads also favor the 9965 heavily, with 110.5% and 95.3% advantages respectively. The 9965 also has higher memory bandwidth at 576.0 GB/s, which supports memory-intensive server workloads. Its average benchmark score of 620,487 places it at the 100th percentile of all CPUs in the database, with the nearest rival, the EPYC 9845, sitting 18.5% behind.

The AMD EPYC 9684X wins in a narrow but important set of scenarios. Its 1,152 MB of shared L3 cache gives it a decisive edge in cache-capacity-sensitive tasks. The PassMark find prime numbers test shows a 40.2% advantage, and the physics test shows a 24.2% advantage. These are workloads where the ability to keep larger working sets resident in cache outweighs the raw core count advantage of the 9965. The 9684X also has a higher base clock at 2.55 GHz versus 2.25 GHz, which can benefit lightly threaded or latency-sensitive operations. Its lower TDP of 400 W versus 500 W is a notable operational difference, though the database does not record performance-per-watt figures.

For most general-purpose server and workstation workloads, the EPYC 9965 is the superior part. The data shows consistent wins across rendering, math, compression, encryption, and multithreaded throughput. For specialized scientific or analytical workloads with large, repeated data sets that fit within cache, the EPYC 9684X's 3D V-Cache design provides a measurable benefit that the 9965 cannot match. The 9684X also remains competitive in its own right, sitting at the 99th percentile of all CPUs, with nearest rivals within 6.5% in either direction.

The choice between the two ultimately depends on workload profile. Organizations running broad, mixed server workloads will find the 9965's comprehensive benchmark dominance compelling. Organizations with cache-sensitive, single-socket applications that can exploit 1,152 MB of L3 may find the 9684X's targeted wins valuable. The launch MSRP difference is negligible: $14813 for the 9965 versus $14756 for the 9684X. The 9965 delivers substantially more aggregate performance for nearly the same launch price, but the 9684X retains a unique cache advantage that no other processor in the immediate comparison group replicates.