AMD EPYC 8324P vs AMD Ryzen 9 9955HX3D Comparison

The AMD EPYC 8324P and AMD Ryzen 9 9955HX3D represent two radically different interpretations of AMD’s modern architecture, one aimed at dense server workloads and the other at high-end mobile performance. The benchmark data reveals a fascinating split: the EPYC 8324P dominates in heavily threaded, cache-sensitive tasks, while the Ryzen 9 9955HX3D counters with superior single-threaded speed and efficiency in specific math workloads. With 15 head-to-head comparisons, the Ryzen 9 edges out a narrow 8-7 win count, but the magnitude of the EPYC’s victories tells a different story about overall compute throughput.

Head-to-Head Benchmarks

The most striking result in the entire comparison is the Cinebench R23 single-core test, where the EPYC 8324P scores 6855 against the Ryzen 9 9955HX3D’s 2159.5. That is a 217.4% advantage for the server chip, an extraordinary margin that defies the usual expectation that mobile parts lead in single-threaded performance. The pattern repeats in Cinebench R15 single-core, where the EPYC wins 690 to 332, a 107.8% delta. These results are counterintuitive given the Ryzen 9’s 5.40 GHz boost clock versus the EPYC’s 3.00 GHz, but the data is unambiguous.

In multi-core workloads, the EPYC’s 32 cores and 64 threads assert themselves. The Cinebench R23 multi-core score of 48557 for the EPYC beats the Ryzen 9’s 38161.5 by 27.2%. The EPYC also wins Cinebench R15 multi-core but by a different margin: the Ryzen 9 actually scores higher there, 6042.5 versus 4894, giving the mobile chip a 19% win. This inconsistency between Cinebench versions suggests the older R15 test scales differently with the Ryzen 9’s architecture and higher boost clocks.

The PassMark suite splits the workloads cleanly. The EPYC 8324P dominates data compression, scoring 980907 versus 785811 (24.8% ahead), and data encryption, 63195 versus 39446 (60.2% ahead). Integer math also favors the EPYC, 248447 versus 222503 (11.7% ahead), as does random string sorting, 113610 versus 83497 (36.1% ahead). These are classic server workloads where the EPYC’s 128 MB of shared L3 cache and 96 PCIe Gen 5 lanes provide a structural advantage.

The Ryzen 9 9955HX3D fights back in PassMark single-thread, scoring 4511 versus 2367, a 47.5% advantage. It also wins find prime numbers, 525 versus 347 (33.9% ahead), and extended instructions, 62813 versus 60304 (4% ahead). Floating point math goes to the Ryzen 9 as well, 144122 versus 139022 (3.5% ahead), and it edges out the EPYC in PassMark multithread, 62674 versus 57127 (8.9% ahead), and physics, 4687 versus 4637 (1.1% ahead). The Ryzen 9’s wins in multithread and physics are notable because they come despite having half the cores and threads.

Looking at overall averages, the EPYC 8324P posts an average benchmark score of 103329, placing it in the 97th percentile of all CPUs. Its nearest rival is the AMD EPYC 7513, which scores 102244 (1.1% behind), while the Intel Xeon 6521P scores 105845 (2.4% ahead of the EPYC). The Ryzen 9 9955HX3D averages 97453, sitting in the 96th percentile, with the AMD Ryzen Threadripper PRO 5965WX at 98504 (1.1% ahead) and the AMD Ryzen 9 PRO 9945 at 96083 (1.4% behind).

The Verdict

The data indicates a clear division of labor. The AMD EPYC 8324P is the choice for workloads that demand raw multi-core throughput and large dataset handling. Its 60.2% lead in data encryption and 36.1% lead in random string sorting make it the superior option for database operations, compression pipelines, and cryptographic tasks. The 217.4% single-core Cinebench R23 result is anomalous but suggests that the EPYC’s Zen 4c architecture, despite lower clock speeds, executes certain instruction streams far more efficiently than the Ryzen 9’s Zen 5 implementation.

The AMD Ryzen 9 9955HX3D wins the majority of head-to-head tests (8 of 15) but by smaller margins on average. Its 47.5% lead in PassMark single-thread and 33.9% lead in prime number finding indicate strong integer performance per core. However, its 55W TDP and dual-channel memory bus (89.6 GB/s) versus the EPYC’s 180W TDP and six-channel memory (230.4 GB/s) explain why it loses in bandwidth-sensitive tasks. The Ryzen 9 also has a higher boost clock (5.40 GHz versus 3.00 GHz), which helps in bursty, latency-sensitive applications.

For a server or workstation environment, the EPYC 8324P is the data-backed pick. Its 97th percentile ranking, higher average score (103329 versus 97453), and decisive wins in encryption and compression make it the appropriate tool for sustained, parallel workloads. For mobile or power-constrained scenarios, the Ryzen 9 9955HX3D offers competitive multi-thread performance (only 8.9% behind in PassMark multithread) with dramatically lower power draw and a smaller footprint. The Ryzen 9’s integrated Radeon 610M graphics and unlocked multiplier are features the EPYC lacks, but those are peripheral to raw compute comparisons.

FAQ

Q: Which CPU has a higher average benchmark score?

A: The AMD EPYC 8324P averages 103329, which is 5.9% higher than the AMD Ryzen 9 9955HX3D’s 97453.

Q: How do they compare in Cinebench R23 multi-core?

A: The EPYC 8324P scores 48557, which is 27.2% higher than the Ryzen 9 9955HX3D’s 38161.5.

Q: Which CPU wins PassMark single-thread performance?

A: The Ryzen 9 9955HX3D scores 4511, a 47.5% advantage over the EPYC 8324P’s 2367.

Q: What is the core and thread count difference?

A: The EPYC 8324P has 32 cores and 64 threads, while the Ryzen 9 9955HX3D has 16 cores and 32 threads.

Q: Which CPU has higher memory bandwidth?

A: The EPYC 8324P supports six-channel memory with 230.4 GB/s bandwidth, versus the Ryzen 9’s dual-channel 89.6 GB/s.

Q: Which CPU is in a higher performance percentile?

A: The EPYC 8324P is in the 97th percentile of all CPUs, while the Ryzen 9 9955HX3D is in the 96th percentile.

Specification Differences

The two CPUs differ in nearly every specification category. The EPYC 8324P has 32 cores and 64 threads, while the Ryzen 9 9955HX3D has 16 cores and 32 threads. Base clocks are close (2.65 GHz versus 2.50 GHz), but boost clocks diverge sharply: the EPYC tops out at 3.00 GHz while the Ryzen 9 reaches 5.40 GHz.

Thermal design power is another major split. The EPYC 8324P draws 180W, while the Ryzen 9 9955HX3D is rated at just 55W. The EPYC uses AMD Socket SP6, whereas the Ryzen 9 uses AMD Socket FL1. The EPYC is a server/workstation part with 96 PCIe Gen 5 lanes (CPU only), while the Ryzen 9 is a mobile part with 28 lanes and integrated Radeon 610M graphics. The EPYC has a launch MSRP of $1895; the Ryzen 9 has no launch MSRP listed. The EPYC’s multiplier is locked, while the Ryzen 9’s is unlocked.

Architecture Differences

Architecturally, these are two distinct generations and designs. The EPYC 8324P is built on Zen 4c architecture (codename Siena) from the EPYC 8004 series, manufactured on a 5 nm process at TSMC. It contains 35,500 million transistors across a 4x 73 mm² die configuration. The Ryzen 9 9955HX3D uses Zen 5 architecture (codename Fire Range) from the 9000 series, on a 4 nm TSMC process, with 16,630 million transistors across a 2x 70.6 mm² configuration.

Cache hierarchies differ. The EPYC has 64 KB of L1 per core and 1 MB of L2 per core, with 128 MB of shared L3. The Ryzen 9 has 80 KB of L1 per core and 1 MB of L2 per core, also with 128 MB of L3. Both support DDR5 memory and ECC, but the EPYC uses six channels versus the Ryzen 9’s two. The EPYC’s release date is September 2023, while the Ryzen 9’s is January 2025. Both are active production parts.