AMD EPYC 8324P vs AMD Ryzen 9 PRO 9955 Comparison

The AMD Ryzen 9 PRO 9955 and the AMD EPYC 8324P represent two distinct approaches to high-performance computing within AMD’s lineup, with the former built for low-latency, high-frequency workloads and the latter engineered for massive parallel throughput. The data shows a clear split: the Ryzen 9 PRO 9955 dominates in single-threaded and prime-number calculations, while the EPYC 8324P wins the majority of multi-threaded and data-intensive benchmarks, taking 8 of 11 head-to-head tests.

Where Each One Wins

The EPYC 8324P is the clear winner for workloads that scale with core count and memory bandwidth. It secures decisive victories in data compression (980,907 vs. 684,470, a 30.2% edge), data encryption (63,195 vs. 33,754, a 46.6% edge), and random string sorting (113,610 vs. 71,928, a 36.7% edge). These are classic server-side tasks where its 32 cores and 64 threads provide a massive parallel advantage. The EPYC also leads in floating-point math (139,022 vs. 121,509) and integer math (248,447 vs. 182,312), further cementing its position for scientific computing and database workloads.

The Ryzen 9 PRO 9955, conversely, is the champion of responsiveness and single-thread performance. It wins the single-thread benchmark with a score of 4,597 versus the EPYC’s 2,367 — a staggering 94.2% advantage. Its lead in the prime-number finding test is also notable: 461 vs. 347, a 32.9% delta. These results indicate the Ryzen is better suited for tasks that cannot be parallelized effectively, such as legacy software, interactive workloads, and lightly-threaded applications where individual core speed is the bottleneck.

The multithread benchmark is surprisingly close, with the EPYC winning 57,127 to 54,866 (a 4% delta), despite its 20-core advantage. This suggests the Ryzen’s higher boost clock and newer architecture partially compensate for the core deficit in general multi-threaded scenarios, but the EPYC’s superior core count still carries the day in specialized parallel tasks like encryption and sorting.

Architecture Differences

The two processors are built on different Zen generations and process nodes. The Ryzen 9 PRO 9955 uses Zen 5 (Granite Ridge) on a 4 nm TSMC process, while the EPYC 8324P uses the older Zen 4c (Siena) architecture on a 5 nm TSMC node. This generational gap explains much of the single-thread performance disparity, as Zen 5 delivers a significantly higher instructions-per-clock (IPC) improvement.

The core configurations are fundamentally different. The Ryzen packs 12 cores and 24 threads with a base clock of 3.40 GHz and a boost clock of 5.40 GHz. The EPYC offers 32 cores and 64 threads, but its base and boost clocks are much lower at 2.65 GHz and 3.00 GHz respectively. The EPYC’s TDP is 180W versus the Ryzen’s 120W, reflecting the higher power draw of its additional cores. The Ryzen’s die size is 2x 70.6 mm² with 16,630 million transistors, while the EPYC uses a 4x 73 mm² configuration with 35,500 million transistors.

Cache hierarchies also diverge. The Ryzen has 80 KB of L1 per core, 1 MB of L2 per core, and 64 MB of L3. The EPYC has 64 KB of L1 per core, 1 MB of L2 per core, but a much larger 128 MB of shared L3. Memory support differs as well: the Ryzen uses a dual-channel DDR5 bus with 89.6 GB/s bandwidth, while the EPYC features a six-channel DDR5 bus with a much higher 230.4 GB/s bandwidth. Both support ECC memory. The EPYC also offers 96 PCIe Gen 5 lanes versus the Ryzen’s 24 lanes, making it far more expandable for storage and accelerators. The Ryzen includes integrated Radeon Graphics, while the EPYC has none. Sockets are incompatible: AM5 for the Ryzen and SP6 for the EPYC.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen 9 PRO 9955 has a boost clock of 5.40 GHz, which is significantly higher than the AMD EPYC 8324P’s boost clock of 3.00 GHz.

Q: How do they compare in single-threaded performance?

A: The Ryzen 9 PRO 9955 wins the passmark single-thread test decisively with a score of 4,597, which is 94.2% higher than the EPYC 8324P’s score of 2,367.

Q: Which processor offers more PCIe lanes?

A: The AMD EPYC 8324P offers 96 PCIe Gen 5 lanes, while the AMD Ryzen 9 PRO 9955 provides only 24 lanes.

Q: What is the memory bandwidth difference?

A: The EPYC 8324P has a six-channel memory bus delivering 230.4 GB/s, whereas the Ryzen 9 PRO 9955 has a dual-channel bus with 89.6 GB/s bandwidth.

Q: Does the Ryzen 9 PRO 9955 have integrated graphics?

A: Yes, it includes Radeon Graphics. The EPYC 8324P does not have any integrated graphics.

Q: Which chip has more L3 cache?

A: The EPYC 8324P has 128 MB of shared L3 cache, double the 64 MB found on the Ryzen 9 PRO 9955.

Specification Differences

• Cores: 12 (Ryzen) vs. 32 (EPYC)
• Threads: 24 (Ryzen) vs. 64 (EPYC)
• Base Clock: 3.40 GHz (Ryzen) vs. 2.65 GHz (EPYC)
• Boost Clock: 5.40 GHz (Ryzen) vs. 3.00 GHz (EPYC)
• TDP: 120W (Ryzen) vs. 180W (EPYC)
• Socket: AM5 (Ryzen) vs. SP6 (EPYC)
• Architecture: Zen 5, Granite Ridge (Ryzen) vs. Zen 4c, Siena (EPYC)
• Process Node: 4 nm (Ryzen) vs. 5 nm (EPYC)
• Transistors: 16,630 million (Ryzen) vs. 35,500 million (EPYC)
• Die Size: 2x 70.6 mm² (Ryzen) vs. 4x 73 mm² (EPYC)
• L1 Cache: 80 KB per core (Ryzen) vs. 64 KB per core (EPYC)
• L3 Cache: 64 MB (Ryzen) vs. 128 MB shared (EPYC)
• Memory Bus: Dual-channel (Ryzen) vs. Six-channel (EPYC)
• Memory Bandwidth: 89.6 GB/s (Ryzen) vs. 230.4 GB/s (EPYC)
• PCIe Lanes: 24 (Ryzen) vs. 96 (EPYC)
• Integrated Graphics: Radeon Graphics (Ryzen) vs. None (EPYC)
• Release Date: 2026-06-29 (Ryzen) vs. 2023-09-17 (EPYC)
• Launch MSRP: $1895 (EPYC only; Ryzen has no listed MSRP)

Head-to-Head Benchmarks

The biggest win for the Ryzen 9 PRO 9955 is in the single-thread test, where it scores 4,597 against the EPYC’s 2,367, yielding a 94.2% delta. This is the single largest performance gap in either direction. The Ryzen also wins the find-prime-numbers test (461 vs. 347, a 32.9% edge), showing its per-core strength in sequential calculations.

The EPYC 8324P’s largest victories come in data encryption (63,195 vs. 33,754, a 46.6% lead) and random string sorting (113,610 vs. 71,928, a 36.7% lead). Data compression also favors the EPYC heavily (980,907 vs. 684,470, a 30.2% lead). In floating-point math, the EPYC wins by a narrower 12.6% margin (139,022 vs. 121,509), while integer math shows a 26.6% gap (248,447 vs. 182,312). The physics benchmark goes to the EPYC (4,637 vs. 3,332, a 28.1% lead), and extended instructions favor the EPYC slightly (60,304 vs. 54,903, a 9% lead). The multithread test is the closest race, with the EPYC winning 57,127 to 54,866, a mere 4% delta.

These results illustrate a consistent theme: the EPYC dominates wherever data can be processed in parallel, while the Ryzen excels in latency-sensitive, single-threaded tasks. The Ryzen’s 3 total wins are all in single-thread or low-thread categories, while the EPYC’s 8 wins span all multi-threaded and data-heavy workloads.

The Verdict

The data supports a clear division of purpose. The AMD Ryzen 9 PRO 9955 is the correct choice for workloads that depend on raw single-core speed, such as interactive development, legacy enterprise applications, and lightly-threaded engineering software. Its 94.2% single-thread advantage over the EPYC makes it the superior pick for any scenario where clock speed is the limiting factor.

The AMD EPYC 8324P, on the other hand, is the definitive choice for high-throughput server environments. Its 32 cores, 64 threads, and six-channel memory with 230.4 GB/s bandwidth enable it to crush data compression, encryption, and sorting tasks by margins ranging from 30% to over 46%. For virtualization, big data analytics, or scientific computing that can leverage many cores, the EPYC’s 8 benchmark wins and its massive PCIe lane count make it the only logical selection from this data.

The Ryzen wins on architecture generation (Zen 5 vs. Zen 4c) and frequency, but the EPYC wins on raw scale and memory bandwidth. Neither chip is universally dominant; the correct pick depends entirely on whether the user’s priority is per-core speed or parallel throughput. For a single-user workstation, the Ryzen’s responsiveness is unmatched. For a server consolidating multiple workloads, the EPYC’s parallel muscle is indispensable.