Intel Xeon 676X vs Intel Xeon w9-3575X Comparison

The Intel Xeon 676X and Intel Xeon w9-3575X represent two distinct approaches to high-end workstation processing, with the data showing a clear overall performance leader despite a significant core-count disadvantage. The Xeon 676X, built on the Granite Rapids architecture with 32 cores, decisively outperforms the 44-core Sapphire Rapids-based Xeon w9-3575X across the vast majority of benchmark tests. While the w9-3575X offers more physical cores, the 676X counters with higher clock speeds, a newer process node, and a larger L3 cache, resulting in a benchmark record of 15 wins against 1 for its rival. This analysis breaks down the head-to-head results, identifies where each processor excels, and explores the architectural decisions behind these outcomes.

Head-to-Head Benchmarks

The most striking pattern in the head-to-head data is the consistency of the Xeon 676X's victory margin. In the Cinebench suite, the 676X wins every single test by exactly 9.3%. In Cinebench R15 multi-core, it scores 7806 against the w9-3575X's 7140, and in the single-core test it posts 1101 versus 1008. This identical deltaPct across all three Cinebench versions (R15, R20, and R23) suggests the performance advantage is fundamental to the architecture rather than workload-specific. The R23 multi-core score of 77447 versus 70837 reinforces this, showing a gap that persists regardless of rendering complexity.

The Passmark suite reveals where the 676X's advantage is most pronounced. The largest single victory comes in Passmark Physics, where the 676X scores 8281 against 6836, a 21.1% lead. This is closely followed by Integer Math, where the 676X posts 354777 versus 298224, a 19% advantage. These results indicate that the 676X's per-core efficiency, driven by its higher 4.90 GHz boost clock against 4.80 GHz, translates directly into superior raw computational throughput. Even in Data Compression, a workload that often scales with core count, the 676X wins by 11.2% (1355807 versus 1219584), proving that its 32 cores are more effective than the w9-3575X's 44 cores in this task.

The w9-3575X's sole victory comes in Passmark Extended Instructions, where it scores 109843 against the 676X's 105231, a 4.2% margin. This is a notable result, as it suggests the older Sapphire Rapids architecture has an advantage in specific vectorized workloads, likely due to its different instruction handling or memory subsystem design. However, this single win is isolated and does not indicate a general trend, as the 676X wins the related Floating Point Math test by 3.7% (283570 versus 273398) and Find Prime Numbers by 7.4% (738 versus 687).

The single-threaded results are particularly telling for workstation users. The 676X wins Passmark Single Thread with a score of 4015 versus 3672, a 9.3% advantage. This is mirrored in Cinebench R15 Single Core (1101 versus 1008) and R20 Single Core (4591 versus 4200). For applications that rely heavily on single-thread performance, such as legacy software or lightly-threaded design tools, the 676X provides a substantial and consistent speedup over the w9-3575X.

Where Each One Wins

For the Intel Xeon 676X, the victory profile is broad and covers almost every category of workstation workload. The data shows it is the clear choice for multi-threaded rendering, as evidenced by its 9.3% lead across all Cinebench tests. Its dominant 21.1% win in Physics and 19% win in Integer Math make it superior for simulation, scientific computing, and any task that relies on complex arithmetic. The 9.3% single-thread advantage also makes it the better option for daily interactivity, code compilation, and applications that are not fully parallelized. Furthermore, its 11.2% win in Data Compression and 8.6% win in Data Encryption position it as the stronger processor for database workloads, file servers, and security-sensitive applications.

The Intel Xeon w9-3575X, despite losing 15 of 16 comparisons, carves out a narrow but real niche. Its 4.2% victory in Extended Instructions suggests it may be preferable for specialized workloads like cryptography, certain scientific simulations, or media encoding that utilize these specific instruction sets. The w9-3575X also offers a higher core count (44 versus 32) and more threads (88 versus 64), which, while not translating to a benchmark victory in the tested suite, could provide an advantage in highly scalable, memory-bound workloads that are not captured by these particular tests. For users running custom applications that can perfectly utilize all 44 cores without hitting memory bandwidth limits, the w9-3575X may still be a viable, if not superior, option.

FAQ

Q: Which processor is faster in multi-core rendering?

A: The Intel Xeon 676X is consistently faster. In Cinebench R23 Multi-Core, it scores 77447 against the w9-3575X's 70837, a 9.3% advantage. This pattern holds across Cinebench R15 and R20 as well.

Q: Does the w9-3575X's higher core count give it any advantage?

A: In the tested benchmarks, no. Despite having 44 cores versus 32, the w9-3575X loses the Passmark Multi-Thread test (83338 versus 91115) and all Cinebench multi-core tests. The only workload where it wins is Passmark Extended Instructions (109843 versus 105231).

Q: How do the two chips compare in single-threaded performance?

A: The Xeon 676X holds a clear lead. It scores 4015 in Passmark Single Thread versus 3672 for the w9-3575X, a 9.3% difference. This is consistent with its higher 4.90 GHz boost clock compared to 4.80 GHz.

Q: Which processor is better for integer-heavy workloads?

A: The Xeon 676X is significantly better. Its Passmark Integer Math score of 354777 is 19% higher than the w9-3575X's 298224. This makes it the stronger choice for tasks like data processing and general computation.

Q: What is the difference in their average benchmark scores?

A: The Xeon 676X has an average benchmark score of 158540, while the w9-3575X averages 144323. This places the 676X roughly 9.9% higher overall, aligning with its dominant head-to-head performance.

Q: Are both processors in the same performance percentile?

A: Yes, both are in the 98th percentile of all CPUs tracked. However, the Xeon 676X's nearest rivals include the AMD EPYC 9355P and EPYC 9375F, with deltaPct values of -1.1% and -2.4% respectively, while the w9-3575X is closely matched with the AMD EPYC 7643P at -0.3%.

Specification Differences

The two processors diverge significantly in their core configurations and physical specifications. The Xeon 676X features 32 cores and 64 threads, while the w9-3575X offers 44 cores and 88 threads. Clock speeds also differ, with the 676X running a 2.80 GHz base clock and 4.90 GHz boost, compared to the w9-3575X's 2.20 GHz base and 4.80 GHz boost. This clock advantage is a primary driver of the 676X's superior single-threaded performance.

The processors are built for different sockets: the 676X uses Intel Socket 4710, while the w9-3575X uses Intel Socket 4677. Their thermal design points also differ substantially, with the 676X rated at 275W TDP versus 340W for the w9-3575X. Memory bandwidth is another key differentiator: the 676X supports 409.6 GB/s, while the w9-3575X is limited to 307.2 GB/s, despite both using eight-channel DDR5 memory. PCIe lane counts also differ, with the 676X offering 128 Gen 5 lanes against 112 for the w9-3575X.

The launch MSRP for the Xeon 676X is $2499, while the w9-3575X has a launch MSRP of $3789. The w9-3575X was released on 2024-08-23, while the 676X is a newer product with a release date of 2026-02-01. Both processors have unlocked multipliers and are currently active in production, targeting the server and workstation market segments.

Architecture Differences

The fundamental architectural gap is the process node. The Xeon 676X is built on Intel's 5 nm process, while the w9-3575X uses the older 10 nm node. This manufacturing advantage contributes to the 676X's higher clock speeds and lower TDP despite having fewer cores. The die configurations also differ: the 676X uses a dual-die design with 2x 598 mm², while the w9-3575X uses a quad-die setup with 4x 477 mm².

Cache hierarchies reveal significant differences. The Xeon 676X, based on the Granite Rapids architecture, has a shared L3 cache of 144 MB, substantially larger than the w9-3575X's 97.5 MB. Per-core L1 cache is also larger on the 676X at 112 KB per core, versus 80 KB per core for the Sapphire Rapids-based w9-3575X. Both processors have 2 MB of L2 cache per core, but the larger L3 and L1 caches on the 676X likely contribute to its superior performance in data-intensive workloads.

The codenames reflect their generation differences: the 676X is part of the Xeon 600 (Granite Rapids-WS) generation, while the w9-3575X belongs to the Xeon W (Sapphire Rapids) generation. This generational leap is evident in the benchmark results, with the newer Granite Rapids architecture delivering higher performance per core. The 676X's higher memory bandwidth of 409.6 GB/s combined with its larger cache hierarchy makes it particularly effective at feeding its 32 cores with data, explaining its dominance in the Passmark Physics and Integer Math tests.