AMD EPYC 9255 vs Intel Xeon w7-3565X Comparison

The Intel Xeon w7-3565X and AMD EPYC 9255 are both flagship-class server and workstation processors, landing in the 97th percentile of all CPUs benchmarked. The data shows a clear split in workload dominance: the AMD EPYC 9255 wins 14 of the 17 head-to-head comparisons, while the Intel Xeon w7-3565X takes 3 decisive wins in specific computational tasks. Despite the EPYC’s broader victory count, the overall average benchmark scores are remarkably close, with the Intel part holding a 1.6% lead (118,307 vs. 116,388). This indicates that the choice between them hinges entirely on the specific application profile, not on raw aggregate performance.

Where Each One Wins

The Intel Xeon w7-3565X establishes its territory in floating-point and vectorized workloads. Its most substantial victory comes in PassMark floating point math, where it scores 218,720 against the EPYC’s 183,367, a 19.3% advantage. It also leads in extended instructions (85,856 vs. 75,185, a 14.2% edge) and data compression (1,075,602 vs. 1,018,904, a 5.6% lead). These results suggest the Intel architecture is better suited for scientific simulation, financial modeling, and other tasks that rely heavily on heavy FPU and SIMD throughput.

The AMD EPYC 9255 wins across the board in single-threaded and most multi-threaded workloads. It takes the Cinebench series entirely, from R15 to R23, with consistent 6.6% margins in both single-core and multi-core tests. Its lead in PassMark physics is staggering at 56.3% (9,740 vs. 4,254), and it also wins integer math (306,442 vs. 279,202), random string sorting (129,202 vs. 110,848), and data encryption (59,668 vs. 54,676). The EPYC is the clear choice for general-purpose compute, database operations, and workloads that benefit from higher clock speeds and per-core efficiency.

Architecture Differences

The two processors embody fundamentally different design philosophies. The Intel Xeon w7-3565X is built on a 10 nm process at Intel’s own fabs, using the Sapphire Rapids architecture. It packs 32 cores and 64 threads, with a base clock of 2.50 GHz and a boost clock of 4.80 GHz. The chip is physically large, with a die size of 4x 477 mm², and features 2 MB of L2 cache per core plus an 82.5 MB L3 cache. Its memory subsystem is an eight-channel DDR5 interface delivering 307.2 GB/s, and it offers 112 PCIe Gen 5 lanes. The TDP is rated at 335 W, and the multiplier is unlocked.

The AMD EPYC 9255, part of the EPYC 9005 series, uses the Zen 5 architecture on a 4 nm process fabricated by TSMC. It has fewer cores—24 cores and 48 threads—but runs at a higher base clock of 3.25 GHz, matching the Intel part’s 4.80 GHz boost. The design is notably more compact with a die size of 4x 70.6 mm² and utilizes 33,260 million transistors. Its cache hierarchy differs: 1 MB of L2 per core and a larger 128 MB shared L3. The EPYC features a wider twelve-channel DDR5 memory bus, doubling the bandwidth to 576.0 GB/s, and provides 128 PCIe Gen 5 lanes. It operates at a much lower 200 W TDP and has a locked multiplier.

These differences explain the benchmark outcomes. The Intel chip’s higher core count and larger L2 cache help in floating-point and compression tasks. The AMD chip’s higher base clock, smaller process node, and double the memory bandwidth give it an edge in memory-intensive and latency-sensitive workloads. The EPYC’s 128 MB L3 cache is 55% larger than Intel’s 82.5 MB, which benefits data-heavy server applications.

Head-to-Head Benchmarks

The Cinebench results are uniformly in favor of the AMD EPYC 9255. In Cinebench R15 multi-core, the EPYC scores 6,483 against Intel’s 6,052, a 6.6% difference. The single-core R15 test shows a similar 6.7% gap (915 vs. 854). This pattern holds in R20 (27,013 vs. 25,218, -6.6%) and R23 (64,318 vs. 60,045, -6.6%). The EPYC’s single-core advantage in R23 is 7.1% (9,080 vs. 8,477). These consistent margins indicate a fundamental per-core performance advantage for the AMD design, likely due to its higher base clock and more efficient Zen 5 architecture.

PassMark results reveal the workload-specific nature of the competition. The Intel Xeon w7-3565X dominates floating-point math with a 19.3% lead (218,720 vs. 183,367) and extended instructions with a 14.2% lead (85,856 vs. 75,185). The Intel chip also wins data compression by 5.6% (1,075,602 vs. 1,018,904). However, the EPYC 9255 wins the remaining PassMark tests. Its biggest margin is in physics, where it scores 9,740 versus Intel’s 4,254—a 56.3% blowout. It also leads in find prime numbers by 31.4% (580 vs. 398), random string sorting by 14.2% (129,202 vs. 110,848), integer math by 8.9% (306,442 vs. 279,202), and data encryption by 8.4% (59,668 vs. 54,676). The EPYC wins the overall PassMark multithread score (76,580 vs. 70,642, -7.8%) and single-thread score (3,655 vs. 3,407, -6.8%).

FAQ

Q: Which processor has a higher core count?

A: The Intel Xeon w7-3565X has 32 cores and 64 threads, while the AMD EPYC 9255 has 24 cores and 48 threads.

Q: Why does the AMD EPYC 9255 win so many more benchmarks despite having fewer cores?

A: The EPYC 9255 has a higher base clock of 3.25 GHz versus Intel’s 2.50 GHz, and it is built on a more advanced 4 nm process. It also has double the memory bandwidth (576.0 GB/s vs. 307.2 GB/s) and a larger 128 MB L3 cache, which boosts per-core and memory-sensitive performance.

Q: In which specific benchmarks does the Intel Xeon w7-3565X outperform the EPYC 9255?

A: The Intel chip wins in PassMark floating point math (218,720 vs. 183,367), extended instructions (85,856 vs. 75,185), and data compression (1,075,602 vs. 1,018,904).

Q: What is the difference in memory bandwidth between the two?

A: The AMD EPYC 9255 supports twelve-channel DDR5 memory with 576.0 GB/s bandwidth, while the Intel Xeon w7-3565X supports eight-channel DDR5 with 307.2 GB/s.

Q: Which processor has a higher TDP?

A: The Intel Xeon w7-3565X has a TDP of 335 W, which is significantly higher than the AMD EPYC 9255’s 200 W.

Q: Are both processors unlocked for overclocking?

A: No, only the Intel Xeon w7-3565X has an unlocked multiplier. The AMD EPYC 9255 has a locked multiplier.

The Verdict

The benchmark data presents a clear bifurcation. For users running scientific computing, financial risk analysis, or any workload dominated by floating-point operations and SIMD instructions, the Intel Xeon w7-3565X is the superior choice. Its 19.3% lead in floating-point math and 14.2% lead in extended instructions are decisive advantages that outweigh its losses elsewhere. The data compression win (5.6%) also makes it suitable for storage and archival workloads.

For nearly every other scenario, the AMD EPYC 9255 is the better processor. It wins all Cinebench tests by 6.6% or more, indicating superior rendering and general multi-threaded performance. Its 56.3% lead in physics and 31.4% lead in prime number finding point to strengths in simulation and integer-heavy tasks. The EPYC’s higher memory bandwidth (576.0 GB/s) and larger cache make it ideal for database, virtualization, and data analytics workloads. Furthermore, its lower TDP (200 W vs. 335 W) and higher base clock (3.25 GHz vs. 2.50 GHz) provide better efficiency and responsiveness.

The overall average benchmark score slightly favors Intel (118,307 vs. 116,388, a 1.6% delta), but this aggregate hides the fact that the EPYC wins 14 of 17 individual tests. The Intel Xeon w7-3565X is a specialist tool for FPU-heavy compute. The AMD EPYC 9255 is the general-purpose champion, delivering superior performance across the widest range of server and workstation tasks. The data suggests that for most buyers, the EPYC 9255 is the more versatile and effective processor.