AMD EPYC 7443P vs Intel Xeon w5-2565X Comparison

The AMD EPYC 7443P and Intel Xeon w5-2565X represent two distinct philosophies for workstation and server processing, with the data revealing a clear split between raw multi-threaded throughput and specialized single-thread performance. The EPYC 7443P, a Zen 3 Milan part from 2021, dominates the overall benchmark count with 13 wins out of 17 head-to-head tests, while the newer Sapphire Rapids Xeon counters with 4 wins, primarily in areas that favor its higher clock speeds. Their average benchmark scores are remarkably close — 81661 for the AMD versus 80671 for the Intel — placing both in the 95th and 96th percentiles of all CPUs, yet the character of their performance could hardly be more different.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 7443P has 24 cores and 48 threads, while the Intel Xeon w5-2565X has 18 cores and 36 threads. This 6-core and 12-thread advantage for AMD is a primary driver of its multi-threaded wins.

Q: How do their single-threaded PassMark scores compare?

A: The Intel Xeon w5-2565X decisively wins single-thread performance with a PassMark score of 3595, which is 19.1% higher than the EPYC 7443P's 2907. This is the largest single-test margin in either direction, favoring Intel.

Q: What is the biggest performance gap in the head-to-head tests?

A: The largest delta is in PassMark's find prime numbers test, where the AMD EPYC 7443P scores 410 against Intel's 218, an 88.1% advantage for AMD. This indicates a substantial difference in integer-heavy, cache-sensitive workloads.

Q: Are both processors currently in production?

A: Yes, both the AMD EPYC 7443P and the Intel Xeon w5-2565X have an "Active" production status according to the data, meaning both are still available for new systems.

Q: Which processor supports faster PCIe lanes?

A: The Intel Xeon w5-2565X supports PCIe Gen 5 with 64 lanes, while the AMD EPYC 7443P uses PCIe Gen 4 with 128 lanes. Intel offers the newer generation, but AMD provides double the lane count.

Q: How much memory bandwidth does each processor provide?

A: The AMD EPYC 7443P offers 204.8 GB/s of memory bandwidth via its eight-channel DDR4 controller. The Intel Xeon w5-2565X provides 153.6 GB/s through its quad-channel DDR5 setup, a 51.2 GB/s deficit for Intel.

Architecture Differences

The architectural divide between these two chips is fundamental, starting with the manufacturing process. The AMD EPYC 7443P is built on a 7 nm process at TSMC, while the Intel Xeon w5-2565X uses Intel's 10 nm process. This generational gap is reflected in their respective codenames: AMD's Milan and Intel's Sapphire Rapids.

The core designs diverge significantly. AMD's Zen 3 architecture for the EPYC 7443P utilizes a die composed of 4x 81 mm² chiplets, containing a total of 16,600 million transistors. Each of its 24 cores has 64 KB of L1 and 512 KB of L2 cache, but the standout is the massive 128 MB of shared L3 cache. Intel's design, by contrast, is a monolithic Sapphire Rapids die with 18 cores, each featuring 80 KB of L1 and a much larger 2 MB of L2 cache per core, but only 37.5 MB of shared L3 cache. This cache layout suggests AMD is betting on large shared pools for data reuse, while Intel relies on faster per-core L2 access.

Memory architecture presents another key difference. The EPYC 7443P uses an eight-channel DDR4 memory bus, delivering 204.8 GB/s of bandwidth. The Xeon w5-2565X shifts to quad-channel DDR5, which is a newer standard but results in lower peak bandwidth at 153.6 GB/s. Both support ECC memory, but the physical infrastructure is entirely different: AMD uses Socket SP3, while Intel requires Socket 4677.

The PCIe capabilities also differ in kind, not just generation. AMD provides 128 lanes of PCIe Gen 4, while Intel offers 64 lanes of PCIe Gen 5. This means AMD has twice the lane count for expansion, while Intel's lanes run at a faster data rate per lane. The Intel part is multiplier-unlocked, a feature absent on the EPYC 7443P, and it lacks integrated graphics, as does the AMD chip.

Head-to-Head Benchmarks

The benchmark data tells a story of divergent strengths, with the EPYC 7443P winning every Cinebench test by a consistent margin. In Cinebench R15 multicore, AMD scores 4881 to Intel's 4446, a 9.8% advantage. This pattern repeats across Cinebench R20 (20341 vs 18527) and R23 (48433 vs 44112), all with the same 9.8% delta. Even the single-core Cinebench tests follow suit: AMD leads R15 single-core 689 to 627 (9.9%) and R20 single-core 2871 to 2615 (9.8%). The consistency suggests the 24-core AMD chip simply outmuscles the 18-core Intel part in rendering workloads, regardless of thread count.

The PassMark suite reveals where Intel fights back. The Xeon w5-2565X wins PassMark single-thread with a score of 3595 versus 2907, a 19.1% lead. It also takes extended instructions (58976 vs 48213, an 18.2% win) and floating point math (147644 vs 129932, a 12% win). These are the workloads where Intel's higher 4.80 GHz boost clock, compared to AMD's 4.00 GHz, can directly influence results.

AMD's responses in the PassMark suite are crushing in specific categories. The EPYC 7443P wins data encryption by a massive 57.5% (57263 vs 36365) and physics by 81.1% (4748 vs 2622). Its lead in find prime numbers is an astronomical 88.1% (410 vs 218), and it dominates integer math with a 22.8% edge (232632 vs 189446). Data compression shows a 13% win (820859 vs 726133), and random string sorting a 28.5% advantage (95581 vs 74360). The overall PassMark multithread score also favors AMD, 56981 to 51897, a 9.8% margin that mirrors the Cinebench results.

Specification Differences

The two processors diverge on nearly every specification dimension. The core count differs by 6 cores (24 vs 18) and 12 threads (48 vs 36). Base clocks favor Intel at 3.20 GHz versus AMD's 2.85 GHz, and boost clocks also favor Intel at 4.80 GHz versus 4.00 GHz. Thermal design power is higher for Intel at 240 W compared to AMD's 200 W.

Cache configurations are starkly different: AMD has 128 MB of shared L3 cache, while Intel has a much smaller 37.5 MB of L3. Per-core L2 cache favors Intel at 2 MB, versus AMD's 512 KB. The process nodes differ (7 nm TSMC for AMD, 10 nm Intel for Intel), and AMD's transistor count is specified at 16,600 million, while Intel's is not provided.

Memory support splits by generation: AMD uses DDR4 with an eight-channel bus, Intel uses DDR5 with a quad-channel bus, resulting in different bandwidth figures (204.8 GB/s vs 153.6 GB/s). PCIe capabilities differ in both generation (Gen 4 vs Gen 5) and lane count (128 vs 64). The sockets are incompatible (SP3 vs 4677), and the release dates are over three years apart (March 2021 for AMD, August 2024 for Intel). Intel is multiplier-unlocked, AMD is not, and Intel has a part number of SRN4E while AMD uses a longer identifier.

The Verdict

The data points to a clear choice for users prioritizing raw throughput: the AMD EPYC 7443P wins 13 of 17 head-to-head benchmarks and holds a 0.7% higher average benchmark score (81661 vs 80671). Its performance in Cinebench multicore, integer math, encryption, and physics is not just marginally better but often 20% to 88% ahead. For rendering, scientific computing, and heavily threaded server workloads, the EPYC 7443P is the superior engine.

However, the Intel Xeon w5-2565X claims victory in the areas that matter for single-threaded responsiveness and specific math operations. Its 19.1% lead in PassMark single-thread and 12% win in floating point math indicate that for applications that cannot scale beyond one core or that rely heavily on FPU throughput, Intel is the better choice. The fact that Intel achieves this with fewer cores (18 vs 24) and a higher TDP (240 W vs 200 W) suggests a design tuned for maximum clock speed over core count.

The launch MSRP is nearly identical — $1337 for AMD and $1339 for Intel — making the decision purely performance-based. Users should select the EPYC 7443P for multi-threaded workloads and the Xeon w5-2565X for single-thread-sensitive applications.

Where Each One Wins

The AMD EPYC 7443P is the definitive winner in multi-threaded rendering, as shown by its unanimous Cinebench sweep across R15, R20, and R23, both single and multicore. It excels in data encryption (57.5% faster) and physics simulation (81.1% faster), making it ideal for scientific computing and simulation workloads. Its massive 128 MB L3 cache and 24 cores drive dominance in integer math (22.8% lead), data compression (13% lead), and random string sorting (28.5% lead). The 88.1% margin in find prime numbers highlights its strength in cache-sensitive, integer-heavy algorithms. For any workload that can utilize 48 threads, the EPYC 7443P is the data-driven choice.

The Intel Xeon w5-2565X wins in single-threaded performance, with a 19.1% advantage in PassMark single-thread and 9.8% leads in Cinebench single-core tests. It also takes extended instructions (18.2% lead), which benefits workloads with specialized vector or cryptographic instruction sets. Its floating point math advantage (12% lead) makes it suitable for FPU-heavy calculations that are not highly threaded. With its higher base and boost clocks, the Xeon w5-2565X is the pick for older software or applications with poor thread scaling, where its 4.80 GHz boost can deliver faster per-core results than the EPYC's 4.00 GHz ceiling.