AMD EPYC 9354 vs AMD Ryzen 9 PRO 9965 Comparison

Head-to-Head Benchmarks

The benchmark data presents a stark contrast between these two AMD processors. The AMD EPYC 9354 wins 9 of 11 recorded comparisons, while the AMD Ryzen 9 PRO 9965 takes only 2, both in single-threaded tests. The magnitude of the EPYC's victories ranges from a modest 8.2% in multithreaded performance to a commanding 64.9% in physics calculations. In contrast, the Ryzen 9 PRO 9965's single-thread advantage is a decisive 80% over the EPYC, making it the clear choice for lightly threaded workloads.

The EPYC 9354 dominates in raw throughput. In data compression, it scores 1,168,626 compared to the Ryzen's 908,293, a 22.3% gap. Data encryption shows an even larger divide: 71,400 versus 44,920, with the EPYC leading by 37.1%. The largest single difference appears in the find prime numbers test, where the EPYC's 934 score dwarfs the Ryzen's 364, a 61% deficit for the latter. Physics performance also heavily favors the EPYC, with scores of 9,281 versus 3,256, a 64.9% advantage. These are not marginal differences; they reflect fundamentally different design priorities.

The Ryzen 9 PRO 9965's two wins are identical in score (4,682) for both the passmark_single_thread and passmark_singlethread tests. Against the EPYC's 2,601, this represents an 80% lead. This is a massive advantage for any application that cannot scale across cores, such as legacy software, certain database queries, or interactive workloads. However, outside of these two tests, the EPYC 9354 consistently outperforms the Ryzen across floating point math (188,894 vs 160,746, a 14.9% lead), integer math (304,828 vs 243,280, a 20.2% lead), extended instructions (86,176 vs 71,210, a 17.4% lead), and random string sorting (140,690 vs 94,915, a 32.5% lead). The multithread test, often a good proxy for overall server throughput, shows the EPYC ahead by 8.2% (72,615 vs 66,655).

Architecture Differences

The architectural divide explains the benchmark results. The AMD Ryzen 9 PRO 9965 is built on the Granite Ridge codename, part of the 9000 series using the Zen 5 architecture. It is manufactured on a 4 nm process at TSMC, with 16,630 million transistors spread across two chiplets, each measuring 70.6 mm². In contrast, the AMD EPYC 9354 uses the Genoa codename, part of the EPYC 9004 series with the Zen 4 architecture, on a 5 nm process. It packs 52,560 million transistors across eight chiplets, each 72 mm². This difference in transistor count and chiplet count directly correlates with core count: the Ryzen has 16 cores and 32 threads, while the EPYC has 32 cores and 64 threads.

Cache allocation further distinguishes them. The Ryzen 9 PRO 9965 offers 80 KB of L1 cache per core, 1 MB of L2 per core, and 64 MB of L3 cache. The EPYC 9354 provides 64 KB of L1 per core, 1 MB of L2 per core, and a massive 256 MB of shared L3 cache. The EPYC's L3 cache is four times larger, which benefits workloads with large working sets or frequent data sharing across cores. The Ryzen's larger per-core L1 (80 KB vs 64 KB) may help individual threads, but the EPYC's overall cache hierarchy is built for server-scale data.

Memory support also diverges sharply. Both use DDR5, but the Ryzen has a dual-channel memory bus with 89.6 GB/s bandwidth, while the EPYC features a twelve-channel memory bus delivering 460.8 GB/s. That is more than five times the memory bandwidth, a critical factor for server workloads that stream data continuously. Both support ECC memory, and both use PCIe Gen 5, but the EPYC offers 128 lanes from the CPU compared to the Ryzen's 24 lanes. The Ryzen includes integrated Radeon Graphics, while the EPYC has none. The sockets differ as well: the Ryzen uses AMD Socket AM5, the EPYC uses AMD Socket SP5.

The Ryzen 9 PRO 9965 has a base clock of 4.30 GHz and a boost clock of 5.50 GHz, with a 170 W TDP. The EPYC 9354 runs at 3.25 GHz base and 3.80 GHz boost, with a 280 W TDP. The Ryzen's higher clocks explain its single-thread dominance, while the EPYC's higher core count and larger cache explain its throughput lead.

Where Each One Wins

The data points to a clear use-case split. The AMD EPYC 9354 wins in every multithreaded and parallel workload recorded. Data compression, encryption, extended instruction sets, prime number finding, floating point math, integer math, multithread, physics, and random string sorting all favor the EPYC. For server virtualization, database serving, scientific computing, or any workload that can utilize 32 cores and 64 threads, the EPYC 9354 is the superior choice. Its 256 MB L3 cache and 460.8 GB/s memory bandwidth make it particularly strong for data-intensive operations where cache hits and memory throughput are bottlenecks. The 64.9% lead in physics and 61% lead in prime numbers specifically indicate strength in simulation and mathematical workloads.

The AMD Ryzen 9 PRO 9965 wins exclusively in single-threaded tests, with an 80% advantage over the EPYC. This makes it the better option for applications that rely on high clock speeds and per-core performance, such as legacy single-threaded software, certain emulation workloads, or interactive desktop-like tasks in a workstation context. Its 5.50 GHz boost clock and 4.30 GHz base clock give it a substantial frequency advantage. For users who prioritize low-latency, single-thread responsiveness over raw parallel throughput, the Ryzen is the clear pick. However, the Ryzen's 8.2% deficit in multithread performance, despite having half the cores, suggests it is not a server-class throughput champion.

FAQ

Q: Which processor is faster in single-threaded workloads?

A: The AMD Ryzen 9 PRO 9965 is significantly faster, scoring 4,682 in the single-thread test compared to the EPYC 9354's 2,601, an 80% advantage.

Q: How much faster is the EPYC 9354 in data encryption?

A: The EPYC 9354 scores 71,400 versus the Ryzen's 44,920, a 37.1% lead in the passmark data encryption test.

Q: Does the Ryzen 9 PRO 9965 have integrated graphics?

A: Yes, the Ryzen 9 PRO 9965 includes Radeon Graphics. The EPYC 9354 does not have integrated graphics.

Q: What is the memory bandwidth difference?

A: The EPYC 9354 has a twelve-channel memory bus with 460.8 GB/s bandwidth, while the Ryzen 9 PRO 9965 has a dual-channel bus with 89.6 GB/s.

Q: Which processor has more L3 cache?

A: The EPYC 9354 has 256 MB of shared L3 cache, while the Ryzen 9 PRO 9965 has 64 MB of L3 cache.

Q: What is the core count difference?

A: The EPYC 9354 has 32 cores and 64 threads, while the Ryzen 9 PRO 9965 has 16 cores and 32 threads.

The Verdict

The data is unambiguous. The AMD EPYC 9354 is the superior processor for server and workstation workloads that demand parallel processing. It wins 9 out of 11 benchmark comparisons, often by double-digit percentages. Its 22.3% lead in data compression, 20.2% lead in integer math, and 64.9% lead in physics demonstrate that it is built for heavy lifting. The 32 cores, 64 threads, 256 MB L3 cache, and 460.8 GB/s memory bandwidth provide the infrastructure for sustained, high-throughput operation. The EPYC's 97th percentile ranking versus all CPUs, with an average benchmark score of 126,810, confirms its standing in the high-end server space.

The AMD Ryzen 9 PRO 9965, despite its 98th percentile ranking and higher average benchmark score of 145,728, wins only in single-threaded tests. Its 80% single-thread advantage is remarkable and cannot be ignored. However, its 16 cores and 64 MB L3 cache limit its parallel capabilities. The Ryzen's 8.2% multithread deficit, despite a 5.50 GHz boost clock, indicates that its architecture is optimized for frequency, not scale. For a workstation where single-thread speed is critical, such as running legacy applications or interactive tools, the Ryzen 9 PRO 9965 is the better choice. For any server role where multiple virtual machines, containers, or parallel processes run concurrently, the EPYC 9354 is the only logical selection.

The benchmark record does not support a middle ground. Either you need the EPYC's massive parallel throughput, or you need the Ryzen's single-thread speed. There is no scenario in the recorded data where the Ryzen 9 PRO 9965 outperforms the EPYC 9354 in a multithreaded test, and no scenario where the EPYC beats the Ryzen in single-thread. The choice depends entirely on the workload's threading profile.

Specification Differences

The two processors differ in nearly every major specification. The Ryzen 9 PRO 9965 has 16 cores and 32 threads, while the EPYC 9354 has 32 cores and 64 threads. The Ryzen's base clock is 4.30 GHz with a boost of 5.50 GHz; the EPYC's base is 3.25 GHz with a boost of 3.80 GHz. TDP also differs: 170 W for the Ryzen, 280 W for the EPYC. The Ryzen uses AMD Socket AM5, the EPYC uses AMD Socket SP5.

The architecture generation is different: the Ryzen is Zen 5 (Granite Ridge) on a 4 nm process, while the EPYC is Zen 4 (Genoa) on a 5 nm process. Transistor counts are 16,630 million for the Ryzen and 52,560 million for the EPYC. Die sizes are 2x 70.6 mm² for the Ryzen and 8x 72 mm² for the EPYC. Cache differs: the Ryzen has 80 KB L1 per core, 1 MB L2 per core, and 64 MB L3; the EPYC has 64 KB L1 per core, 1 MB L2 per core, and 256 MB shared L3.

Memory support shows both use DDR5, but the Ryzen has a dual-channel bus with 89.6 GB/s bandwidth, while the EPYC has a twelve-channel bus with 460.8 GB/s. The Ryzen has 24 PCIe Gen 5 lanes from the CPU; the EPYC has 128. The Ryzen includes integrated Radeon Graphics; the EPYC does not. Both support ECC memory. The release dates differ, with the Ryzen 9 PRO 9965 listed as active in 2026, while the EPYC 9354 was released in 2022. The EPYC 9354 has a launch MSRP of $3420; the Ryzen 9 PRO 9965 has no listed launch MSRP. Both have locked multipliers.