AMD EPYC 8534P vs AMD EPYC 9355P Comparison

Head-to-Head Benchmarks

The benchmark data reveals a clear split: the AMD EPYC 9355P dominates in rendering and single-threaded workloads, while the AMD EPYC 8534P takes the lead in several data-processing tasks. Across the 17 recorded head-to-head tests, the 9355P wins 12, while the 8534P wins 5.

The 9355P's most striking advantage appears in Cinebench. Across all three versions (R15, R20, R23), the 9355P leads by exactly 26.1% in both multi-core and single-core tests. In concrete scores, the 9355P posts 8,332 versus 6,160 in Cinebench R15 multi-core; 34,719 versus 25,668 in R20 multi-core; and 82,666 versus 61,115 in R23 multi-core. Single-core results follow the same pattern: 1,176 versus 869 in R15, 4,901 versus 3,623 in R20, and 11,670 versus 8,628 in R23.

The 9355P also wins decisively in PassMark's physics test, posting 13,515 against 3,667, a 72.9% margin. Prime number finding is similarly lopsided: 1,044 versus 278, a 73.4% gap. Random string sorting goes to the 9355P at 176,697 versus 129,479 (26.7% ahead), and PassMark's multi-thread score favors the 9355P at 96,603 versus 71,900 (25.6% ahead). In single-thread PassMark, the 9355P scores 3,747 versus 2,441, a 34.9% advantage.

The 8534P counters with substantial wins in data compression and encryption. It scores 1,791,742 in data compression versus 1,429,976 for the 9355P, a 25.3% lead. Data encryption shows an even larger gap: 121,728 versus 80,961, a 50.4% advantage. The 8534P also leads in integer math (514,526 versus 412,067, up 24.9%) and floating-point math (289,443 versus 256,635, up 12.8%). Extended instructions go narrowly to the 8534P at 112,860 versus 107,622, a 4.9% edge.

The overall picture is that the 9355P offers consistent multi-core rendering superiority, while the 8534P excels in specific throughput-oriented tasks. The 9355P's 26.1% lead across all Cinebench tests suggests a fundamental architectural advantage in this workload, not a fluke of one test version.

FAQ

Q: Which processor has the higher average benchmark score?

A: The AMD EPYC 8534P has a higher average benchmark score at 185,092, compared to 160,358 for the AMD EPYC 9355P. This averages across all recorded tests, including the PassMark suite where the 8534P wins several categories.

Q: How does the 9355P compare to its nearest rivals?

A: The 9355P sits within 1.3% of the AMD EPYC 9375F (which scores 162,497), is 1% behind the AMD EPYC 7663 (161,973), and is 1.1% ahead of the Intel Xeon 676X (158,540). It leads the Intel Xeon 6745P by 3.6%.

Q: What is the 8534P's position among all CPUs?

A: The 8534P ranks in the 98th percentile of all CPUs. Its closest rival is the AMD Ryzen Threadripper PRO 9975WX, which it beats by 1.3%, while the Intel Xeon 6740E beats it by 1.4%.

Q: Which processor has more cores and threads?

A: The AMD EPYC 8534P has 64 cores and 128 threads, double the 32 cores and 64 threads of the AMD EPYC 9355P.

Q: Do both processors support ECC memory?

A: Yes, both the AMD EPYC 8534P and the AMD EPYC 9355P support ECC memory, and both use DDR5 memory modules.

Q: Which processor has the higher boost clock?

A: The AMD EPYC 9355P has a boost clock of 4.40 GHz, compared to 3.10 GHz for the AMD EPYC 8534P.

Architecture Differences

The two processors come from entirely different design generations. The AMD EPYC 8534P uses the Zen 4c architecture under the codename "Siena," part of the EPYC 8004 series. The AMD EPYC 9355P uses the Zen 5 architecture under the codename "Turin," part of the EPYC 9005 series.

The manufacturing process differs as well. The 8534P is built on a 5 nm process at TSMC, while the 9355P uses a more advanced 4 nm process, also at TSMC. Transistor counts reflect this shift: the 9355P packs 66,520 million transistors across 8 dies of 70.6 mm² each, while the 8534P has 35,500 million transistors across 4 dies of 73 mm² each.

Cache layouts diverge significantly. The 8534P has 64 KB of L1 cache per core, 1 MB of L2 per core, and 128 MB of shared L3 cache. The 9355P has 80 KB of L1 per core, 1 MB of L2 per core, and doubles the L3 to 256 MB shared. This larger L3 cache on the 9355P likely contributes to its strong single-threaded and rendering performance.

Memory architecture also differs. The 8534P uses a six-channel memory bus with 230.4 GB/s of bandwidth, while the 9355P uses a twelve-channel bus with 576.0 GB/s, exactly double the bandwidth. The 9355P also offers more PCIe connectivity: 128 Gen 5 lanes versus 96 Gen 5 lanes on the 8534P.

The sockets are incompatible: the 8534P uses AMD Socket SP6, while the 9355P uses AMD Socket SP5. The 9355P lists integrated graphics as "N/A," while the 8534P has no integrated graphics field recorded.

Specification Differences

The core count is the most obvious difference: 64 cores and 128 threads on the 8534P versus 32 cores and 64 threads on the 9355P. Clock speeds favor the 9355P, with a base clock of 3.55 GHz versus 2.30 GHz, and a boost clock of 4.40 GHz versus 3.10 GHz.

Thermal design power differs notably. The 8534P has a TDP of 200, while the 9355P has a TDP of 280. This is consistent with the 9355P's higher clock speeds despite fewer cores.

Memory bandwidth and channels are another major differentiator: the 8534P offers six channels at 230.4 GB/s, while the 9355P offers twelve channels at 576.0 GB/s. PCIe lanes also differ: 96 Gen 5 lanes for the 8534P versus 128 Gen 5 lanes for the 9355P.

Release dates are roughly a year apart. The 8534P launched on September 17, 2023, while the 9355P launched on October 9, 2024. The launch MSRP for the 8534P is $4950, and for the 9355P it is $2998. Both are listed as Active in production.

Cache sizes differ (128 MB L3 versus 256 MB L3, and 64 KB versus 80 KB L1 per core), but L2 cache is identical at 1 MB per core. Both have their multiplier locked.

Where Each One Wins

The AMD EPYC 9355P is the clear choice for rendering and simulation workloads. Its 26.1% lead across all Cinebench tests, whether single-core or multi-core, indicates a strong advantage in 3D rendering, video encoding, and other tasks that rely on sustained multi-threaded CPU compute. The 72.9% lead in PassMark physics reinforces this, as physics simulations often scale with raw core performance and clock speed. The 9355P also wins decisively in prime number finding (73.4% ahead), a workload heavily dependent on integer arithmetic and cache efficiency.

For single-threaded responsiveness, the 9355P leads by 34.9% in PassMark single-thread tests. This matters for database queries, interactive workloads, and any application where per-core latency is critical. The 9355P's 256 MB L3 cache and 4.40 GHz boost clock provide the foundation for these wins.

The AMD EPYC 8534P wins in specific data-processing domains. Its 50.4% lead in data encryption suggests a strong advantage in cryptographic workloads and secure data handling. The 25.3% lead in data compression makes it suitable for file archiving, backup systems, and database compression tasks. The 24.9% lead in integer math and 12.8% lead in floating-point math indicate broad compute throughput advantages in mixed workloads.

The 8534P's 64 cores and 128 threads likely drive these wins, as parallelizable tasks like compression and encryption can scale across many cores even at lower clock speeds. The 4.9% lead in extended instructions suggests a slight edge in specialized instruction sets, though this margin is narrow.

The Verdict

The data indicates two distinct deployment profiles. The AMD EPYC 9355P is the higher-performance processor for general compute, rendering, and single-threaded tasks. Its 26.1% lead in every Cinebench test, combined with a 34.9% single-thread advantage, makes it the obvious pick for engineering workstations, render farms, and simulation clusters. The 72.9% physics lead and 73.4% prime number lead reinforce this position. The 9355P also offers double the memory bandwidth (576.0 GB/s versus 230.4 GB/s) and more PCIe lanes (128 versus 96), which matters for IO-intensive servers.

The AMD EPYC 8534P is the specialized choice for data-centric workloads. Its 50.4% encryption lead and 25.3% compression lead make it attractive for storage servers, database appliances, and security-focused deployments. The 24.9% integer math lead and 12.8% floating-point lead suggest strong throughput in mixed scientific and enterprise workloads. Its higher average benchmark score (185,092 versus 160,358) reflects these wins, even though the 9355P takes more individual tests.

The 9355P also brings architectural advantages: Zen 5 on a 4 nm node, 256 MB L3 cache, and a twelve-channel memory bus. The 8534P counters with Zen 4c on a 5 nm node, 128 MB L3, and a six-channel bus. The 8534P has double the cores but half the memory bandwidth per core.

For organizations running varied enterprise workloads, the 9355P is the safer general-purpose choice. For those with dedicated data compression, encryption, or high-throughput integer workloads, the 8534P's specialized wins are substantial enough to justify selection. Both processors rank in the 98th percentile of all CPUs, so neither is a weak performer; the choice comes down to workload profile rather than overall capability.