AMD EPYC 8434P vs AMD EPYC 9354 Comparison
AMD EPYC 8434P
EPYC 9354
PERFORMANCE BENCHMARKS
Analysis: AMD EPYC 8434P vs AMD EPYC 9354
The AMD EPYC 8434P and AMD EPYC 9354 are two server processors that target different corners of the data center. The 8434P, from the EPYC 8004 series, uses 48 Zen 4c cores in a 200 W envelope, while the 9354 from the EPYC 9004 series uses 32 full Zen 4 cores at 280 W. Benchmark results reveal a stark division of labor: the 9354 sweeps all Cinebench tests and physics workloads, while the 8434P dominates data compression, encryption, and integer math. The recorded data shows the 8434P holds a 98th percentile ranking against all CPUs, compared to the 9354's 97th, yet the average benchmark score favors the 8434P at 146881 versus 126810 for the 9354. In the database, the 8434P's average score places it 0.1% behind the Threadripper PRO 9965WX (147009) and 0.8% ahead of the Ryzen 9 PRO 9965 (145728). The 9354's average score is 1.6% ahead of the Xeon 6730P (124756) and 2.1% ahead of the Threadripper PRO 5975WX (124171).
Where Each One Wins
The 8434P wins 5 of the 17 head-to-head tests. These wins are concentrated in Passmark Data Compression (1412835 vs 1168626), Data Encryption (97254 vs 71400), Extended Instructions (86189 vs 86176), Floating Point Math (215669 vs 188894), and Integer Math (385290 vs 304828). The 9354 wins the remaining 12 tests, including every Cinebench R15, R20, and R23 multi-core and single-core test, plus Passmark Find Prime Numbers, Multithread, Physics, Random String Sorting, and Single Thread. The pattern is clear: the 8434P excels in throughput-oriented data manipulation, while the 9354 is stronger in latency-sensitive and scalar workloads. The 8434P's wins are not marginal; they represent substantial leads in specific data processing tasks, whereas the 9354's wins are consistent but often smaller in percentage terms outside of physics and prime number finding.
Architecture Differences
The architectural split is fundamental. The 8434P uses Zen 4c (Siena) on a 5 nm TSMC process, with 35,500 million transistors across 4x 73 mm² dies. The 9354 uses full Zen 4 (Genoa) on the same 5 nm TSMC process, but packs 52,560 million transistors across 8x 72 mm² dies. The 8434P has 128 MB of shared L3 cache, while the 9354 has 256 MB. Memory support differs significantly: the 8434P uses six-channel DDR5 with 230.4 GB/s bandwidth, while the 9354 uses twelve-channel DDR5 with 460.8 GB/s. PCIe lanes also differ, with 96 lanes on the 8434P versus 128 on the 9354. The sockets are different: SP6 for the 8434P and SP5 for the 9354. TDP is 200 W versus 280 W. Release dates are 2023-09-17 and 2022-11-09 respectively. The Zen 4c architecture in the 8434P is designed for density and efficiency, allowing more cores per socket, while the full Zen 4 in the 9354 prioritizes higher clock speeds and larger caches per core.
Head-to-Head Benchmarks
The 9354 wins all Cinebench tests by exactly -8.4% delta. For example, Cinebench R23 multi-core scores 61722 for the 9354 versus 56516 for the 8434P. Single-core R23 is 8713 versus 7978. The 8434P's biggest win is in Data Encryption, with a 36.2% advantage (97254 vs 71400). Integer Math shows a 26.4% lead (385290 vs 304828). Data Compression is 20.9% ahead (1412835 vs 1168626). Floating Point Math is 14.2% ahead (215669 vs 188894). The 9354's biggest win is in Find Prime Numbers, with a -68.1% delta (934 vs 298). Physics shows a -56.5% delta (9281 vs 4036). Random String Sorting is -10.5% (140690 vs 125932). Single Thread is -5.9% (2601 vs 2448). Extended Instructions is a near tie, with the 8434P winning by 0% (86189 vs 86176). The consistency of the 9354's -8.4% lead across all Cinebench versions suggests a fundamental per-core advantage, while the 8434P's massive leads in encryption and integer math point to a strong parallel throughput capability that the 9354 cannot match.
FAQ
Q: Which processor has more cores?
A: The AMD EPYC 8434P has 48 cores and 96 threads, while the AMD EPYC 9354 has 32 cores and 64 threads.
Q: Which processor has higher single-thread performance?
A: The AMD EPYC 9354 wins all single-core Cinebench tests and Passmark Single Thread, scoring 2601 versus 2448 in Passmark Single Thread, a 5.9% advantage.
Q: Which processor has more L3 cache?
A: The AMD EPYC 9354 has 256 MB of shared L3 cache, double the 128 MB found on the AMD EPYC 8434P.
Q: Which processor has higher memory bandwidth?
A: The AMD EPYC 9354 supports twelve-channel DDR5 with 460.8 GB/s, while the 8434P uses six-channel DDR5 with 230.4 GB/s.
Q: Which processor wins in data encryption?
A: The AMD EPYC 8434P wins Passmark Data Encryption with a score of 97254, a 36.2% lead over the 9354's 71400.
Q: Which processor has more PCIe lanes?
A: The AMD EPYC 9354 has 128 PCIe lanes, while the AMD EPYC 8434P has 96.
Specification Differences
The two processors differ in nearly every core specification. The 8434P offers 48 cores and 96 threads, while the 9354 offers 32 cores and 64 threads. Base clocks are 2.50 GHz versus 3.25 GHz, and boost clocks are 3.10 GHz versus 3.80 GHz. TDP is 200 W versus 280 W. The 8434P uses Socket SP6, while the 9354 uses Socket SP5. Architecture is Zen 4c versus Zen 4, with codenames Siena and Genoa respectively. Transistor counts are 35,500 million versus 52,560 million, and die sizes are 4x 73 mm² versus 8x 72 mm². L3 cache is 128 MB versus 256 MB. Memory bus is six-channel versus twelve-channel, with bandwidths of 230.4 GB/s versus 460.8 GB/s. PCIe lanes are 96 versus 128. Release dates are 2023-09-17 versus 2022-11-09. Launch MSRP is $2700 versus $3420.
The Verdict
The data indicates a clear use-case split. The AMD EPYC 9354 is the choice for workloads that depend on single-thread speed, physics simulation, and prime number finding, as evidenced by its wins in all Cinebench tests, Passmark Physics, and Find Prime Numbers. Its higher boost clock of 3.80 GHz and larger 256 MB L3 cache support this. The AMD EPYC 8434P, with its 48 cores, is better suited for data compression, encryption, and integer math, where its 20.9%, 36.2%, and 26.4% leads respectively show a strong throughput advantage. The 8434P also holds a higher percentile ranking (98 vs 97) and a higher average benchmark score (146881 vs 126810), though the 9354 wins more individual tests. The 9354's 12 wins versus the 8434P's 5 wins might suggest a dominant overall performance, but the magnitude of the 8434P's wins in its specialized areas is substantial, with deltas of 20.9%, 36.2%, and 26.4% in key data workloads. Conversely, the 9354's wins in Cinebench are consistently at -8.4%, and its physics win is -56.5%, but its single-thread win is only -5.9%. This asymmetry means the choice depends entirely on the workload mix. Users prioritizing raw scalar performance and physics should select the 9354, while those handling large data sets and encryption should consider the 8434P.