AMD EPYC 9555P vs AMD Ryzen Threadripper 9970X Comparison

The AMD EPYC 9555P and AMD Ryzen Threadripper 9970X represent two distinct interpretations of AMD’s Zen 5 architecture, aimed at different corners of the high-performance market. The EPYC 9555P is a 64-core server behemoth built for throughput, while the Threadripper 9970X is a 32-core desktop flagship tuned for clock speed and responsiveness. The benchmark data reveals a stark split: the EPYC dominates multi-threaded workloads by massive margins, yet the Threadripper decisively wins single-thread performance. This head-to-head analysis quantifies those gaps using PassMark benchmark results, architectural specifications, and relative performance data.

Head-to-Head Benchmarks

The EPYC 9555P wins 9 of the 11 head-to-head benchmarks featured in the data, often by enormous margins. The most lopsided result is in PassMark’s physics test, where the EPYC scores 15,474 against the Threadripper’s 6,835, a 126.4% advantage. This suggests the EPYC’s core count is overwhelmingly beneficial for simulation and physics-based workloads that scale with parallel execution. Similarly, in data encryption, the EPYC posts 148,896 versus 86,765, a 71.6% lead, indicating a strong advantage for security and cryptographic tasks. The find-prime-numbers test shows a 73.5% gap (1,067 vs 615), while integer math sees the EPYC at 787,106 compared to 465,378, a 69.1% difference. Floating-point math follows the same pattern: 486,407 for the EPYC versus 309,719 for the Threadripper, a 57% lead.

Data compression is another clear win for the EPYC, scoring 2,639,400 against 1,757,998, a 50.1% advantage. Extended instructions show a 34.2% gap (191,082 vs 142,342), and random string sorting favors the EPYC by 46.5% (280,398 vs 191,445). Even in the multithread benchmark, which is the closest multi-core result, the EPYC still leads with 123,576 versus 107,399, a 15.1% margin. These results consistently show that the EPYC’s 64 cores and 128 threads translate into substantial real-world performance gains across nearly every parallel workload category.

The Threadripper 9970X’s only victories come in single-thread tests. In PassMark’s single-thread benchmark, it scores 4,530 against the EPYC’s 3,410, a 24.7% advantage. This is a significant margin, and it reflects the Threadripper’s higher boost clock of 5.40 GHz compared to the EPYC’s 4.40 GHz. The single-thread result is the same for both PassMark single-thread and singlethread entries, confirming consistency. While this is just one category, it is critical for applications that rely on per-core performance, such as legacy software, certain games, and lightly-threaded productivity tasks. The Threadripper’s advantage here is not trivial; it means snappier response times and better performance in workloads that cannot utilize more than a few cores.

On average, the EPYC 9555P holds a 2.6% aggregate benchmark score advantage over the Threadripper 9970X (287,066 vs 279,778). This overall margin is relatively modest given the EPYC’s dominance in multi-threaded tests, which suggests that the Threadripper’s single-thread prowess pulls its average up significantly. The EPYC also ranks in the 99th percentile among all CPUs, as does the Threadripper, placing both in the top tier of available processors. The nearest rival data shows the EPYC at 0.3% ahead of the Intel Xeon 696X and 0.6% ahead of the AMD EPYC 9565, while the Threadripper sits 0.2% behind the Intel Xeon 6780E, 2% behind the EPYC 9565, and 2.5% behind the EPYC 9555P.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 9555P has 64 cores and 128 threads, while the AMD Ryzen Threadripper 9970X has 32 cores and 64 threads. The EPYC offers exactly double the core and thread count.

Q: What is the single-thread performance difference?

A: The Threadripper 9970X wins the PassMark single-thread benchmark with a score of 4,530, which is 24.7% higher than the EPYC 9555P’s 3,410. This advantage is driven by the Threadripper’s higher boost clock of 5.40 GHz versus 4.40 GHz.

Q: How large is the multi-threaded performance gap?

A: The EPYC 9555P leads by 15.1% in the PassMark multithread benchmark (123,576 vs 107,399). In more specialized multi-threaded tests like physics and encryption, the EPYC’s lead expands to 126.4% and 71.6%, respectively.

Q: Do both processors support ECC memory?

A: Yes, both the EPYC 9555P and the Threadripper 9970X list ECC memory support as true. However, the EPYC uses a twelve-channel memory bus with 576.0 GB/s bandwidth, while the Threadripper uses a quad-channel bus with 204.8 GB/s.

Q: What is the difference in PCIe lane count?

A: The EPYC 9555P provides Gen 5 with 128 lanes (CPU only), while the Threadripper 9970X provides Gen 5 with 80 lanes (CPU only). The EPYC offers 48 more PCIe lanes.

Q: Which processor has a higher TDP?

A: The EPYC 9555P has a TDP of 360 watts, while the Threadripper 9970X has a TDP of 350 watts. The difference is a mere 10 watts.

Architecture Differences

Both processors are built on TSMC’s 4 nm process node and share the Zen 5 architecture, but they diverge significantly in their physical construction and memory subsystems. The EPYC 9555P, codenamed Turin, is part of the EPYC 9005 series and uses an 8x 70.6 mm² die configuration, totaling 66,520 million transistors. The Threadripper 9970X, codenamed Shimada Peak, belongs to the 9000 series and uses a 4x 70.6 mm² die configuration with 33,260 million transistors. The EPYC’s die count is double, reflecting its higher core count and larger shared cache.

The cache hierarchy differs notably. The EPYC 9555P provides 80 KB of L1 cache per core and 1 MB of L2 per core, with a massive 256 MB of shared L3 cache. The Threadripper 9970X has 64 KB of L1 per core, 1 MB of L2 per core, and 128 MB of L3 cache. The EPYC’s L3 cache is exactly double that of the Threadripper. The L1 cache per core is also larger on the EPYC, which may contribute to its efficiency in certain workloads despite the Threadripper’s higher clock speeds.

Memory architecture is another major differentiator. The EPYC 9555P supports twelve-channel DDR5 memory with a theoretical bandwidth of 576.0 GB/s, while the Threadripper 9970X supports quad-channel DDR5 with 204.8 GB/s. This gives the EPYC nearly three times the memory bandwidth, which is critical for server workloads involving large datasets and many concurrent threads. Both processors support ECC memory, but the EPYC’s memory subsystem is designed for enterprise-class reliability and capacity.

The socket and platform targets are entirely different. The EPYC uses AMD Socket SP5, a server platform, while the Threadripper uses AMD Socket sTR5, a desktop workstation platform. The EPYC is classified as a Server/Workstation part, whereas the Threadripper is classified as Desktop. Both have no integrated graphics (N/A), requiring a discrete GPU. The EPYC’s multiplier is locked, while the Threadripper’s multiplier is unlocked, allowing overclocking on the latter. The production status for both is listed as Active.

Specification Differences

The core and thread counts are the most obvious specification difference: the EPYC 9555P offers 64 cores and 128 threads, while the Threadripper 9970X offers 32 cores and 64 threads. Base clocks differ, with the EPYC at 3.20 GHz and the Threadripper at 4.00 GHz. Boost clocks show an even larger gap: the EPYC boosts to 4.40 GHz, while the Threadripper reaches 5.40 GHz. TDP is nearly identical, with the EPYC at 360 watts and the Threadripper at 350 watts.

The EPYC 9555P uses the AMD Socket SP5, while the Threadripper 9970X uses AMD Socket sTR5. The memory bus width is a key differentiator: twelve-channel for the EPYC versus quad-channel for the Threadripper. Memory bandwidth follows suit, with the EPYC at 576.0 GB/s and the Threadripper at 204.8 GB/s. PCIe lane count is also different: the EPYC provides 128 Gen 5 lanes (CPU only), while the Threadripper provides 80 Gen 5 lanes (CPU only).

Cache configurations differ in L1 and L3 sizes. The EPYC has 80 KB of L1 per core, while the Threadripper has 64 KB per core. L3 cache is 256 MB shared on the EPYC versus 128 MB on the Threadripper. The market segment is Server/Workstation for the EPYC and Desktop for the Threadripper. The multiplier is locked on the EPYC and unlocked on the Threadripper. Release dates also differ, with the EPYC released on 2024-10-09 and the Threadripper on 2025-07-29. The launch MSRP for the EPYC is $7983, while the Threadripper’s launch MSRP is $2499.

The Verdict

The data paints a clear picture: the AMD EPYC 9555P is the superior processor for multi-threaded, server-oriented workloads. Its 64 cores, 128 threads, and 256 MB of L3 cache deliver decisive wins in physics (126.4% ahead), encryption (71.6% ahead), and integer math (69.1% ahead). The twelve-channel memory bus provides 576.0 GB/s of bandwidth, nearly triple the Threadripper’s 204.8 GB/s, making it the obvious choice for virtualization, database processing, and heavy scientific computation. The EPYC also leads in aggregate benchmark score by 2.6%, and its nearest rival data shows it ahead of the Intel Xeon 696X by 0.3%.

The AMD Ryzen Threadripper 9970X, however, is the better pick for users who prioritize single-thread performance and clock speed. Its 5.40 GHz boost clock yields a 24.7% advantage in single-thread benchmarks, which is substantial for applications that rely on per-core speed. The unlocked multiplier allows overclocking, a feature absent on the EPYC. With 32 cores and 64 threads, it still offers ample multi-threaded power, but its quad-channel memory bus and 128 MB of L3 cache place it below the EPYC in bandwidth-sensitive tasks. The Threadripper’s 350-watt TDP is slightly lower, and its desktop platform may offer more accessible motherboard options.

For buyers, the choice depends entirely on workload. The EPYC 9555P is the data-center workhorse, optimized for massive parallel throughput and memory bandwidth. The Threadripper 9970X is a high-frequency desktop processor that excels at single-threaded tasks and offers overclocking flexibility. The benchmark results show that neither is a universal champion; the EPYC dominates multi-core, while the Threadripper takes single-core. The 2.6% aggregate score difference in favor of the EPYC is the final arbiter for general-purpose use, but that margin is small enough that the Threadripper’s single-thread advantage could tip the scales for specific applications.