AMD EPYC 4565P vs AMD EPYC 4585PX Comparison

Both AMD EPYC processors in this comparison are 16-core, 32-thread Zen 5 parts on the same socket with identical clock speeds, yet they do not perform identically. The benchmark data shows the AMD EPYC 4585PX wins 13 of the 17 head-to-head tests, while the AMD EPYC 4565P wins 4. The decisive factor between these two server/workstation chips is the L3 cache configuration, which creates a clear split between compute-heavy and data-throughput workloads. This analysis walks through the benchmark results, architectural differences, and specification gaps to determine which processor fits which role.

Where Each One Wins

The AMD EPYC 4585PX is the clear winner in threaded rendering and physics simulation. In Cinebench R23 multi-core, it scores 60451 against the 4565P's 54405, a consistent 11.1% advantage that repeats across every Cinebench R15, R20, and R23 test, both single and multi-core. The PassMark physics test shows an even larger gap: the 4585PX scores 6612 versus 2976 for the 4565P, a 122.2% delta. This suggests the larger cache directly benefits physics calculations that rely on repeated data access.

The 4585PX also dominates prime number finding, scoring 547 versus 294 (86.1% ahead), and random string sorting, scoring 95210 versus 81318 (17.1% ahead). Data compression also favors the 4585PX, with scores of 884774 versus 860786 (2.8% ahead), and extended instructions show a 7.9% lead (69457 versus 64345). These wins point to workloads where the larger L3 cache reduces memory latency and keeps more working data on-die.

The AMD EPYC 4565P, conversely, wins in a smaller set of specific tests. It leads in PassMark single-thread performance, scoring 4712 versus 4538 (3.7% ahead), and in data encryption, scoring 48268 versus 47224 (2.2% ahead). It also edges out the 4585PX in integer math, scoring 250683 versus 248563 (0.8% ahead). Floating-point math is nearly a tie, with the 4585PX barely ahead at 153219 versus 152003 (0.8% delta). The 4565P's wins are narrower and more specialized, indicating it is not a general-purpose performance leader but rather a chip that excels in specific single-threaded or encryption-bound tasks.

Architecture Differences

Both processors share the same foundational architecture: Zen 5, codename Grado, built on TSMC's 4 nm process with 16,630 million transistors and a die size of 2x 70.6 mm². Both use AMD Socket AM5, support DDR5 memory with dual-channel bus and 89.6 GB/s bandwidth, and include ECC memory support. Each has 80 KB of L1 cache per core and 1 MB of L2 cache per core, with 16 cores and 32 threads, base clock of 4.30 GHz, and boost clock of 5.70 GHz.

The sole architectural difference is the L3 cache. The AMD EPYC 4585PX has 128 MB of L3 cache, while the AMD EPYC 4565P has 64 MB of shared L3 cache. This 64 MB difference is the only spec that changes between the two, and it explains the benchmark deltas. The 4585PX is the "PX" variant, which in this data set implies a doubled L3 pool. The 4565P's smaller cache means it must fetch more data from system memory, which is slower, but it also means the silicon area can be used differently, potentially explaining its slight single-thread advantage.

Both processors have integrated Radeon Graphics, Gen 5 PCIe with 24 lanes (CPU only), and are marked for the Server/Workstation market segment. Neither has an unlocked multiplier. They share the same production status (Active) and the same release date of 2025-05-12. The part numbers differ (100-000001561 for the 4585PX, 100-000001559 for the 4565P), but the architecture is otherwise identical.

Head-to-Head Benchmarks

The most striking result is the PassMark physics test, where the 4585PX scores 6612 versus 2976 for the 4565P, a 122.2% delta. This is the largest percentage gap in the entire comparison, and it indicates that the 4585PX's larger cache is critical for physics simulations that involve complex, cache-sensitive data structures. Similarly, the prime number test shows an 86.1% delta (547 versus 294), confirming that the 4585PX handles algorithmic workloads with tight data loops far better.

In Cinebench R23 multi-core, the 4585PX scores 60451 versus 54405, an 11.1% delta that exactly matches the single-core delta (8534 versus 7680). This consistency across all six Cinebench tests suggests the cache advantage scales uniformly with clock-for-clock performance. The 4585PX also wins PassMark multi-thread with 68908 versus 63474 (8.6% delta) and random string sorting with 95210 versus 81318 (17.1% delta).

The 4565P's wins are narrower. Its PassMark single-thread score of 4712 beats the 4585PX's 4538 by 3.7%, a modest but real advantage. Data encryption shows a 2.2% lead (48268 versus 47224), and integer math is essentially a tie at 0.8% (250683 versus 248563). Floating-point math is also within 0.8% (153219 versus 152003), favoring the 4585PX but within noise. The 4565P's wins in single-thread and encryption suggest that its smaller cache may allow for slightly better memory latency characteristics in specific access patterns, or that the 4585PX's larger cache incurs a small penalty in certain operations.

Specification Differences

The two processors are identical in all specifications except for L3 cache size and launch MSRP. The AMD EPYC 4585PX has 128 MB of L3 cache, while the AMD EPYC 4565P has 64 MB (shared). The 4585PX has a launch MSRP of $699, and the 4565P has a launch MSRP of $589. All other fields match: 16 cores, 32 threads, 4.30 GHz base, 5.70 GHz boost, 170 W TDP, AMD Socket AM5, Zen 5 architecture, Grado codename, 4 nm process, TSMC foundry, 16,630 million transistors, 2x 70.6 mm² die size, 80 KB L1 per core, 1 MB L2 per core, DDR5 memory, dual-channel bus, 89.6 GB/s bandwidth, ECC memory, Gen 5 PCIe with 24 lanes, integrated Radeon Graphics, Server/Workstation segment, Active production status, 2025-05-12 release date, and locked multiplier.

The specification table shows no other differences. The 4565P's lower MSRP is the only other distinguishing feature beyond the cache. This means buyers are choosing between a 64 MB cache with a $589 launch MSRP or a 128 MB cache with a $699 launch MSRP. The benchmark data shows the larger cache buys an 11.1% improvement in Cinebench scores and a 122.2% improvement in physics, but the smaller cache wins in single-thread and encryption.

FAQ

Q: Which processor has more L3 cache?

A: The AMD EPYC 4585PX has 128 MB of L3 cache, while the AMD EPYC 4565P has 64 MB (shared). This is the only architectural difference between the two.

Q: Do the two processors have the same clock speeds?

A: Yes, both have a base clock of 4.30 GHz and a boost clock of 5.70 GHz. They also share the same TDP of 170 W and the same 16-core, 32-thread configuration.

Q: Which CPU wins in Cinebench R23 multi-core?

A: The AMD EPYC 4585PX wins with a score of 60451 versus 54405 for the 4565P, an 11.1% delta. The 4585PX also wins every other Cinebench test by the same 11.1% margin.

Q: In which tests does the AMD EPYC 4565P outperform the 4585PX?

A: The 4565P wins PassMark single-thread (4712 versus 4538, 3.7% ahead), data encryption (48268 versus 47224, 2.2% ahead), and integer math (250683 versus 248563, 0.8% ahead).

Q: How large is the performance gap in the PassMark physics test?

A: The 4585PX scores 6612 versus 2976 for the 4565P, a 122.2% delta. This is the largest percentage difference in any benchmark between the two.

Q: What is the launch MSRP for each processor?

A: The AMD EPYC 4585PX has a launch MSRP of $699, and the AMD EPYC 4565P has a launch MSRP of $589.

The Verdict

The data indicates a clear performance hierarchy. The AMD EPYC 4585PX is the superior processor for most workloads, winning 13 of 17 head-to-head tests. Its 128 MB L3 cache delivers consistent 11.1% wins across all Cinebench tests, a 122.2% lead in physics, an 86.1% lead in prime number finding, and an 8.6% lead in PassMark multi-thread. For server and workstation tasks that involve rendering, simulation, compression, or data sorting, the 4585PX is the stronger choice, and its 97th percentile ranking versus all CPUs (compared to 96th for the 4565P) reflects this broader superiority.

The AMD EPYC 4565P, however, has a specific niche. Its 3.7% lead in PassMark single-thread and 2.2% lead in data encryption suggest that workloads dominated by single-threaded performance or cryptographic operations may prefer the smaller cache. Its average benchmark score of 95764 is only 3.6% behind the 4585PX's 99324, and it beats the AMD EPYC 9175F (avg score 95615) by 0.2%, placing it in the same performance tier as its nearest rivals. For users prioritizing encryption throughput or maximum single-thread speed, the 4565P is the data-backed choice.

In practical terms, the 4585PX is the pick for multi-threaded compute, physics, and cache-sensitive data workloads, where its performance deltas are too large to ignore. The 4565P is the pick for single-thread-bound or encryption-heavy applications, where its wins, while smaller, are real. The 64 MB cache difference is the sole reason for this split, and the benchmark data confirms that cache size matters most in exactly the workloads where the 4585PX dominates.