AMD EPYC 4584PX vs AMD Ryzen 9 8940HX Comparison

The AMD EPYC 4584PX and AMD Ryzen 9 8940HX are both 16-core Zen 4 parts, but they target completely different worlds: one is a server/workstation processor on Socket AM5, the other a mobile chip on Socket FL1. The benchmark data shows a clear split, with the EPYC dominating multi-threaded and compute-heavy tests while the Ryzen takes a narrow win in single-threaded Passmark tests. Of the 15 head-to-head benchmarks, the EPYC wins 12, while the Ryzen wins three, but the margins tell a more nuanced story than the raw win count.

Head-to-Head Benchmarks

The biggest single victory for the EPYC 4584PX comes in Cinebench R23 single-core, where it scores 7274 against the Ryzen's 1917 — a massive 279.4% delta. This is not a small gap; it is a generational difference in per-thread performance. The same pattern appears in Cinebench R15 single-core, where the EPYC's 733 beats the Ryzen's 292 by 151%. These results indicate that despite both being Zen 4, the EPYC's higher boost clock of 5.70 GHz versus 5.30 GHz on the Ryzen, combined with its server-grade design, produces far superior single-threaded throughput in these specific workloads.

In multi-threaded Cinebench R23, the EPYC again dominates, scoring 51524 against 32521 for the Ryzen, a 58.4% advantage. The EPYC's 128 MB of shared L3 cache, versus the Ryzen's 64 MB, likely plays a role here, as does the 120 W TDP versus the mobile chip's 55 W. The Cinebench R15 multi-core test is the only multi-threaded benchmark the Ryzen wins, scoring 5355 versus 5193, a slim 3% margin. This is an outlier compared to the other multi-core results, suggesting the Ryzen's thermal headroom in that specific test was sufficient to edge out the EPYC.

Outside of Cinebench, the EPYC's wins are consistent but less extreme. In Passmark physics, the EPYC scores 4574 against 2104, a 117.4% lead. In find prime numbers, the EPYC's 441 beats the Ryzen's 251 by 75.7%. Data encryption shows a 16.7% EPYC advantage (45902 vs 39318), and multithreaded performance is 16.9% higher (58117 vs 49731). The EPYC also wins data compression (741648 vs 650984, up 13.9%), extended instructions (53774 vs 47802, up 12.5%), and random string sorting (87690 vs 75381, up 16.3%).

Floating-point and integer math are closer, with the EPYC ahead by 6.6% (121460 vs 113921) and 6.7% (201919 vs 189221) respectively. The only wins for the Ryzen 9 8940HX are in Passmark single-thread and single-thread (same score, listed twice), where it scores 3874 versus the EPYC's 3795, a 2% margin. This is a narrow victory, but it is consistent across both identical entries in the data.

Where Each One Wins

The EPYC 4584PX is the clear choice for heavily threaded, cache-sensitive, and compute-intensive workloads. Its 58.4% lead in Cinebench R23 multi-core and 117.4% lead in Passmark physics indicate it is built for rendering, scientific simulation, and any task that scales across cores and benefits from large shared cache. The 16.9% multithreaded Passmark win and the 13.9% data compression advantage reinforce this. The 75.7% lead in find prime numbers is particularly telling for cryptographic or number-crunching server tasks. For a workstation running VMs, compiling code, or processing large datasets, the EPYC's data shows a decisive edge.

The Ryzen 9 8940HX, despite its 55 W TDP, holds its own in single-threaded Passmark tasks, edging the EPYC by 2%. This suggests that for lightly threaded, latency-sensitive applications like certain legacy software or interactive workloads, the mobile chip is not a bottleneck. Its win in Cinebench R15 multi-core, albeit by only 3%, shows that in shorter burst workloads, the Ryzen can match or slightly exceed the EPYC, likely due to its unlocked multiplier (it is the only one of the two with this feature) allowing for quick boost behavior within its power envelope. For a mobile user who needs occasional heavy multi-threaded work but primarily runs single-threaded apps, the Ryzen's profile is more balanced.

Architecture Differences

Both chips are built on TSMC's 5 nm process with Zen 4 architecture, and both have 16 cores and 32 threads. The EPYC 4584PX is codenamed Raphael and belongs to the EPYC 4004 series, while the Ryzen 9 8940HX is codenamed Dragon Range from the 8000 series. The EPYC uses a dual-chiplet design with a die size of 2x 71 mm² and 17,840 million transistors, while the Ryzen also uses 2x 71 mm² dies but with fewer transistors at 13,140 million. The EPYC has a 120 W TDP, whereas the Ryzen is rated at just 55 W.

Cache is a major differentiator. The EPYC features 128 MB of shared L3 cache, plus a 1x 64MB 3D V-Cache slice, whereas the Ryzen has only 64 MB of L3 and no 3D V-Cache. Both have 64 KB L1 and 1 MB L2 per core. The EPYC supports ECC memory, while the Ryzen does not, and both support DDR5 with dual-channel memory and 83.2 GB/s bandwidth. PCIe is identical: Gen 5 with 28 lanes (CPU only). Integrated graphics differ, with the EPYC featuring Radeon Graphics and the Ryzen featuring a Radeon 610M. The EPYC's base clock is 4.20 GHz with a boost of 5.70 GHz, while the Ryzen runs at 2.40 GHz base and 5.30 GHz boost. The EPYC is not multiplier-unlocked, while the Ryzen is.

FAQ

Q: Which CPU has the higher boost clock?

A: The AMD EPYC 4584PX has a boost clock of 5.70 GHz, while the AMD Ryzen 9 8940HX has a boost clock of 5.30 GHz.

Q: Does the Ryzen 9 8940HX support ECC memory?

A: No. The data shows ECC memory support is true for the EPYC 4584PX, but false for the Ryzen 9 8940HX.

Q: Why is the EPYC so much faster in Cinebench R23 single-core?

A: The EPYC scores 7274 versus 1917 for the Ryzen, a 279.4% delta. This is likely due to its higher 5.70 GHz boost clock and its 128 MB of shared L3 cache, compared to the Ryzen's 5.30 GHz and 64 MB L3.

Q: Is the Ryzen 9 8940HX better in any benchmark?

A: Yes, the Ryzen wins Passmark single-thread (3874 vs 3795) and Cinebench R15 multi-core (5355 vs 5193), though the multi-core margin is only 3%.

Q: What is the transistor count difference?

A: The EPYC 4584PX has 17,840 million transistors, while the Ryzen 9 8940HX has 13,140 million, despite both using 2x 71 mm² dies.

Q: Are both CPUs on the same socket?

A: No. The EPYC 4584PX uses AMD Socket AM5, while the Ryzen 9 8940HX uses AMD Socket FL1.

Specification Differences

• Socket: AMD Socket AM5 (EPYC) vs AMD Socket FL1 (Ryzen)
• Base Clock: 4.20 GHz (EPYC) vs 2.40 GHz (Ryzen)
• Boost Clock: 5.70 GHz (EPYC) vs 5.30 GHz (Ryzen)
• TDP: 120 W (EPYC) vs 55 W (Ryzen)
• L3 Cache: 128 MB shared plus 1x 64MB 3D V-Cache slice (EPYC) vs 64 MB (Ryzen)
• Transistors: 17,840 million (EPYC) vs 13,140 million (Ryzen)
• ECC Memory: Supported (EPYC) vs not supported (Ryzen)
• Integrated Graphics: Radeon Graphics (EPYC) vs Radeon 610M (Ryzen)
• Multiplier Unlocked: No (EPYC) vs Yes (Ryzen)
• Market Segment: Server/Workstation (EPYC) vs Mobile (Ryzen)
• Release Date: 2024-05-20 (EPYC) vs 2025-04-22 (Ryzen)
• Launch MSRP: $699 (EPYC) vs none listed (Ryzen)

The Verdict

The data points to the AMD EPYC 4584PX for anyone building a workstation or server where multi-threaded performance and large cache are paramount. Its 12 wins out of 15 benchmarks, including a 58.4% lead in Cinebench R23 multi-core and a 117.4% lead in physics, make it the superior compute engine. The 128 MB L3 cache and 3D V-Cache slice provide a significant advantage in cache-sensitive workloads, as seen in the data compression and encryption tests. With a 96th percentile ranking among all CPUs, it sits slightly ahead of the Ryzen's 95th percentile, and its nearest rival (AMD EPYC 9135) is only 0.1% away, showing it competes at the top of its class.

The AMD Ryzen 9 8940HX, while losing most head-to-head matchups, is not a weak processor. Its 2% win in Passmark single-thread and 3% win in Cinebench R15 multi-core show it can handle bursty tasks effectively. The 55 W TDP makes it suitable for mobile use, and the unlocked multiplier offers overclocking potential that the EPYC lacks. However, its 58.4% deficit in Cinebench R23 multi-core and 75.7% deficit in find prime numbers indicate it will struggle in sustained heavy workloads. For a laptop user who needs occasional multi-core power and strong single-thread responsiveness, the Ryzen is adequate. For a rack or desk-bound professional, the EPYC 4584PX is the clear choice based on benchmark data.