Intel Xeon 658X vs Intel Xeon w7-3555 Comparison

The Intel Xeon 658X and Intel Xeon w7-3555 are both active server/workstation processors from Intel, but the benchmark data shows a decisive performance gap. Across 17 head-to-head comparisons, the 658X wins every single test, with margins ranging from 5% to a massive 63.1%. The Xeon 658X posts a higher average benchmark score of 116,060 compared to the w7-3555's 106,192, and both sit at the 97th percentile of all CPUs. The 658X achieves this with fewer cores (24 vs. 28) and threads (48 vs. 56), indicating that architectural efficiency and higher clock speeds carry the day. This analysis walks through the benchmark data step by step, identifies where each processor excels, and outlines the architectural and specification differences that explain the results.

Head-to-Head Benchmarks

The Intel Xeon 658X dominates the Xeon w7-3555 across every measured workload. The smallest win comes in PassMark single-thread tests, where the 658X scores 3,728 against 3,549 for a 5% advantage. This pattern holds across all Cinebench tests, with the 658X consistently ahead by 8.4-8.5%. In Cinebench R23 multi-core, the 658X scores 62,466 versus 57,590, an 8.5% edge; single-core R23 shows the same delta at 8,818 vs. 8,130. The consistency of these margins suggests a fundamental per-core performance advantage rather than workload-specific optimization.

The largest performance gap appears in PassMark's find prime numbers test, where the 658X scores 649 against 398 — a 63.1% advantage. This is an outlier compared to other results, indicating the 658X's architecture handles integer-heavy, branch-dependent workloads far more efficiently. Floating-point math also shows a significant gap: the 658X scores 210,480 versus 190,917, a 10.2% lead. Physics calculations follow a similar pattern, with the 658X ahead by 11.5% (6,470 vs. 5,802).

Data-centric workloads show consistent advantages as well. Data compression favors the 658X at 1,062,062 versus 966,970, a 9.8% margin. Data encryption shows a 9.1% lead (52,357 vs. 48,007), and extended instructions run 9% faster (84,626 vs. 77,619). Integer math delivers a 7.9% advantage (263,995 vs. 244,642), while random string sorting is 7.2% faster (103,028 vs. 96,112). The multi-threaded PassMark score rounds out the picture at 73,490 vs. 67,754, an 8.5% lead.

Looking at the nearest rivals provides context for these numbers. The 658X's average score of 116,060 places it just 0.3% behind the AMD EPYC 9255 (116,388), 0.8% ahead of the Intel Xeon 6527P (115,190), 1.9% behind the Intel Xeon w7-3565X (118,307), and 3.6% behind the AMD EPYC 9384X (120,427). The w7-3555, meanwhile, averages 106,192, which is 0.2% behind the AMD Ryzen 9 9850HX (106,413), 0.3% ahead of the Intel Xeon 6521P (105,845), 2.3% behind the Intel Xeon w7-2595X (108,663), and 2.8% ahead of the AMD EPYC 8324P (103,329). The gap between the two processors in this comparison is roughly equivalent to the distance between their respective rival clusters.

Where Each One Wins

The data shows zero benchmark wins for the Intel Xeon w7-3555. The 658X claims all 17 head-to-head victories, making the use-case split straightforward. For any workload captured by these tests, the 658X is the faster processor. The w7-3555's 28 cores and 56 threads do not translate into any measurable advantage in multi-threaded benchmarks; the 658X actually wins the multi-thread PassMark test by 8.5% despite having 4 fewer cores and 8 fewer threads.

The biggest wins for the 658X come in prime number finding (63.1% ahead), physics (11.5%), and floating-point math (10.2%). These are compute-intensive workloads that benefit from the 658X's higher boost clock of 4.90 GHz versus 4.80 GHz on the w7-3555, as well as its larger 144 MB shared L3 cache versus 75 MB. The 5 nm process node of the 658X, compared to the 10 nm node on the w7-3555, also contributes to its efficiency advantage.

The w7-3555's closest performance comes in single-thread tests, where the 658X leads by only 5%. This suggests that for lightly-threaded tasks, the difference narrows but still favors the 658X. The 658X's per-core L1 cache of 112 KB versus 80 KB on the w7-3555 likely explains part of this edge. Both processors have 2 MB of L2 cache per core and support DDR5 memory with eight-channel buses, though the 658X offers higher memory bandwidth at 409.6 GB/s versus 307.2 GB/s.

The Verdict

The data is unambiguous: the Intel Xeon 658X outperforms the Intel Xeon w7-3555 across every benchmark in this comparison. With a 17-0 win record, the 658X is the superior choice for any workload represented by these tests. Its average benchmark score of 116,060 is 9.3% higher than the w7-3555's 106,192, and it achieves this with fewer cores and threads. The 658X's 24 cores and 48 threads are sufficient to outpace the w7-3555's 28 cores and 56 threads, demonstrating that core count alone does not determine performance.

Users should choose the Intel Xeon 658X if they prioritize raw compute performance, especially in floating-point math, physics simulations, and prime number calculations. The 63.1% lead in prime number finding is particularly notable, suggesting the 658X handles integer-bound algorithms with far greater efficiency. The 658X also offers a higher boost clock (4.90 GHz vs. 4.80 GHz), more L3 cache (144 MB vs. 75 MB), and a smaller process node (5 nm vs. 10 nm), all of which contribute to its performance advantage.

The Intel Xeon w7-3555 remains a capable processor in absolute terms, sitting at the 97th percentile of all CPUs. Its 28 cores provide strong multi-threading potential, and its average score of 106,192 places it near the AMD Ryzen 9 9850HX and Intel Xeon 6521P. However, in a direct comparison with the 658X, the w7-3555 cannot match the newer architecture's efficiency. The 658X's launch MSRP is $1699, while the w7-3555's is $2339, meaning the lower-priced processor also delivers higher performance in every measured test.

FAQ

Q: Which processor wins the most benchmarks?

A: The Intel Xeon 658X wins all 17 head-to-head benchmarks against the Intel Xeon w7-3555, with no wins for the w7-3555.

Q: What is the largest performance gap between the two?

A: In the PassMark find prime numbers test, the 658X scores 649 versus 398 on the w7-3555, a 63.1% advantage.

Q: How do their multi-core Cinebench scores compare?

A: In Cinebench R23 multi-core, the 658X scores 62,466 while the w7-3555 scores 57,590, giving the 658X an 8.5% lead.

Q: Do the core counts affect the results?

A: Despite having 24 cores and 48 threads versus the w7-3555's 28 cores and 56 threads, the 658X still wins the multi-threaded PassMark test by 8.5% (73,490 vs. 67,754).

Q: What are the nearest rivals for each processor?

A: The 658X's closest rival is the AMD EPYC 9255 (0.3% ahead), while the w7-3555's closest is the AMD Ryzen 9 9850HX (0.2% ahead).

Q: What is the single-thread performance difference?

A: The 658X leads by 5% in PassMark single-thread tests (3,728 vs. 3,549), the smallest margin of any benchmark in this comparison.

Architecture Differences

The two processors come from different architectural generations. The Intel Xeon 658X uses the Granite Rapids architecture on a 5 nm process node, while the Intel Xeon w7-3555 is based on the Sapphire Rapids codename on a 10 nm node. This process advantage allows the 658X to pack more capability into a smaller footprint, reflected in its die size of 2x 598 mm² versus 4x 477 mm² for the w7-3555. The 658X's newer architecture delivers higher per-core performance, as evidenced by its benchmark wins despite fewer cores.

Cache configurations differ substantially. The 658X offers 112 KB of L1 cache per core, 2 MB of L2 cache per core, and a shared 144 MB L3 cache. The w7-3555 has 80 KB of L1 per core, 2 MB of L2 per core, and 75 MB of L3 cache total. The 658X's L3 cache is nearly double the w7-3555's, which helps explain its advantage in data-heavy workloads like compression (9.8% ahead) and encryption (9.1% ahead). The larger cache reduces memory access latency and improves data reuse.

Memory bandwidth also favors the 658X at 409.6 GB/s versus 307.2 GB/s for the w7-3555, despite both supporting DDR5 with eight-channel memory buses. PCIe connectivity differs as well: the 658X provides Gen 5 with 128 lanes (CPU only), while the w7-3555 offers Gen 5 with 112 lanes (CPU only). The 658X also has an unlocked multiplier, whereas the w7-3555 is locked. Both processors support ECC memory, have no integrated graphics, and target the server/workstation market segment.

Specification Differences

The core and thread counts differ: the 658X has 24 cores and 48 threads, while the w7-3555 has 28 cores and 56 threads. Clock speeds favor the 658X with a base clock of 3.00 GHz and boost clock of 4.90 GHz, compared to the w7-3555's 2.70 GHz base and 4.80 GHz boost. Thermal design power (TDP) is higher on the w7-3555 at 325 watts versus 250 watts for the 658X, meaning the 658X delivers better performance with lower power consumption.

Sockets differ: the 658X uses Intel Socket 4710, while the w7-3555 uses Intel Socket 4677. The process node is 5 nm for the 658X and 10 nm for the w7-3555. Die size is 2x 598 mm² for the 658X and 4x 477 mm² for the w7-3555. The 658X has a larger L3 cache (144 MB shared) versus 75 MB on the w7-3555, and higher memory bandwidth (409.6 GB/s vs. 307.2 GB/s). PCIe lanes are 128 on the 658X versus 112 on the w7-3555. Release dates differ, with the 658X launching on 2026-02-01 and the w7-3555 on 2024-08-23. The multiplier is unlocked on the 658X but locked on the w7-3555. The 658X has a launch MSRP of $1699, while the w7-3555 is $2339.