AMD Ryzen 9 PRO 9965 vs Intel Xeon w9-3575X Comparison

The AMD Ryzen 9 PRO 9965 and Intel Xeon w9-3575X are both high-end workstation processors, but the data reveals two fundamentally different philosophies. The AMD part is a 16-core, 32-thread processor on TSMC's 4 nm node, while the Intel part is a 44-core, 88-thread behemoth on Intel's 10 nm node. In the head-to-head benchmark suite, the Intel Xeon w9-3575X wins 9 out of 11 tests, while the AMD Ryzen 9 PRO 9965 takes only 2, yet the average benchmark scores are remarkably close. The AMD processor posts an average benchmark score of 145,728, while the Intel processor posts 144,323, a difference of less than 1%. This suggests that while the Intel part dominates in raw multi-threaded throughput, the AMD part's efficiency and single-thread performance keep the overall averages nearly identical.

Head-to-Head Benchmarks

The Intel Xeon w9-3575X's most decisive victory comes in the Passmark physics test, where it scores 6,836 against the AMD Ryzen 9 PRO 9965's 3,256. This represents a 52.4% advantage for Intel, the largest delta in the entire suite. The physics test typically scales well with core count, and the Intel part has 44 cores compared to the AMD's 16. Similarly, the floating-point math test shows a 41.2% lead for Intel, with scores of 273,398 versus 160,746. This is another test that benefits heavily from parallel execution, and the Intel part's 88 threads allow it to process far more floating-point operations simultaneously.

The extended instructions test is another significant Intel win, with a 35.2% margin (109,843 vs 71,210). This test often involves AVX-512 workloads, where the Intel Sapphire Rapids architecture is known to be particularly strong. The random string sorting test also goes to Intel by 29.5% (134,723 vs 94,915), and data compression shows a 25.5% Intel advantage (1,219,584 vs 908,293). Data encryption is 27.8% better on Intel (62,258 vs 44,920), and the find prime numbers test shows a 47% Intel lead (687 vs 364). The multithread score is 20% higher on Intel (83,338 vs 66,655), and the integer math test shows an 18.4% Intel advantage (298,224 vs 243,280).

However, the AMD Ryzen 9 PRO 9965 has one clear counterattack: single-thread performance. In the Passmark single-thread test, AMD scores 4,682 against Intel's 3,672, a 27.5% advantage. This is a massive margin and reflects the AMD part's higher boost clock of 5.50 GHz versus the Intel's 4.80 GHz. The AMD part also has a much higher base clock of 4.30 GHz versus the Intel's 2.20 GHz, which helps in lightly-threaded workloads. This single-thread dominance is the reason the AMD part's overall average score is competitive despite losing most multi-threaded tests. The data implies that for workloads that cannot use more than a few cores, the AMD part will be significantly faster, while for heavily parallel tasks, the Intel part is in a different league.

Where Each One Wins

The Intel Xeon w9-3575X wins in every multi-threaded Passmark test in the suite. This includes data compression, encryption, extended instructions, prime number finding, floating-point math, integer math, multithread, physics, and random string sorting. The margin of victory ranges from 18.4% to 52.4%, showing that the Intel part's core count advantage translates into consistent, substantial wins across diverse computational patterns. The physics test at 52.4% and prime numbers at 47% are the standout victories, suggesting that simulations and number-theoretic calculations will see the biggest benefit from the Intel part. The data compression and encryption wins, at 25.5% and 27.8% respectively, indicate that data-intensive server workloads will also perform better on Intel.

The AMD Ryzen 9 PRO 9965 wins exclusively in single-thread tests. Both the Passmark single-thread and singlethread tests show the same 27.5% advantage for AMD. This means that for applications like legacy software, lightly-threaded database queries, or interactive CAD tools that rely on a single primary thread, the AMD part will feel noticeably snappier. The data does not show any multi-threaded workload where the AMD part wins, so users with purely parallel workloads should look at the Intel part. However, the AMD part's 27.5% single-thread lead is not trivial; it could translate into faster response times in mixed workloads where some threads are serial bottlenecks. The benchmark results indicate that the Intel part is the clear choice for compute-heavy, parallel tasks, while the AMD part is superior for single-threaded responsiveness.

Architecture Differences

The two processors come from fundamentally different architectural blueprints. The AMD Ryzen 9 PRO 9965 uses the Granite Ridge codename, built on the Zen 5 microarchitecture, and is manufactured on TSMC's 4 nm process node. It uses a chiplet design with a die size of 2x 70.6 mm², containing 16,630 million transistors. The Intel Xeon w9-3575X uses the Sapphire Rapids codename, built on the Xeon W generation, and is manufactured on Intel's 10 nm process node. Its die size is much larger at 4x 477 mm², and the transistor count is not listed in the data. The AMD part has 16 cores and 32 threads, while the Intel part has 44 cores and 88 threads, a 2.75x core advantage for Intel.

Cache hierarchies also differ significantly. Both processors have 80 KB of L1 cache per core, but the AMD part has 1 MB of L2 per core while the Intel part has 2 MB per core. The L3 cache is where the biggest difference appears: the AMD part has 64 MB total, while the Intel part has 97.5 MB. This larger L3 cache on the Intel part could help with data reuse in large working sets. The AMD part uses a 4 nm process, which is more advanced than Intel's 10 nm, potentially allowing for higher clock speeds and better power efficiency per core. The AMD part has a base clock of 4.30 GHz and boost of 5.50 GHz, while the Intel part has a base of 2.20 GHz and boost of 4.80 GHz. The AMD part's higher clocks are likely enabled by the smaller process node and lower core count.

The memory architecture is also a major differentiator. The AMD part supports dual-channel DDR5 memory with a bandwidth of 89.6 GB/s. The Intel part supports eight-channel DDR5 with a bandwidth of 307.2 GB/s, which is 3.4x higher. This memory bandwidth advantage is crucial for workloads that stream large datasets, like data compression and encryption, and likely contributes to the Intel part's wins in those tests. Both processors support ECC memory, which is expected for server/workstation parts. The Intel part also has a much higher PCIe lane count: 112 lanes of Gen 5 versus the AMD's 24 lanes. This makes the Intel part more suitable for systems with multiple GPUs or high-speed storage arrays.

Specification Differences

The most obvious specification difference is core count: the AMD Ryzen 9 PRO 9965 has 16 cores and 32 threads, while the Intel Xeon w9-3575X has 44 cores and 88 threads. Clock speeds are also starkly different, with the AMD part having a 4.30 GHz base and 5.50 GHz boost, versus the Intel part's 2.20 GHz base and 4.80 GHz boost. The TDP reflects this: the AMD part is rated at 170 W, while the Intel part is rated at 340 W, exactly double. The sockets are incompatible: AMD uses Socket AM5, while Intel uses Socket 4677. The process nodes differ, with AMD on 4 nm and Intel on 10 nm. The L2 cache per core is 1 MB for AMD and 2 MB for Intel, while the total L3 cache is 64 MB for AMD and 97.5 MB for Intel.

Memory support is another key difference: the AMD part is dual-channel, while the Intel part is eight-channel, leading to a significant bandwidth gap (89.6 GB/s vs 307.2 GB/s). The PCIe lane count is vastly different: the AMD part has 24 Gen 5 lanes, while the Intel part has 112 Gen 5 lanes. The AMD part includes integrated Radeon Graphics, while the Intel part has no integrated graphics (N/A). The release dates are different, with the AMD part listed as 2026-06-29 and the Intel part as 2024-08-23. The Intel part has a launch MSRP of $3789, while the AMD part has no listed launch MSRP. The Intel part has an unlocked multiplier, while the AMD part does not. Finally, the die sizes are different: the AMD part uses 2x 70.6 mm² chiplets, while the Intel part uses 4x 477 mm² dies.

FAQ

Q: Which processor has a higher single-thread performance?

A: The AMD Ryzen 9 PRO 9965 wins the Passmark single-thread test with a score of 4,682 versus the Intel Xeon w9-3575X's 3,672, a 27.5% advantage.

Q: How much faster is the Intel Xeon w9-3575X in multi-threaded workloads?

A: In the Passmark multithread test, the Intel part scores 83,338 versus the AMD's 66,655, a 20% lead. The Intel part also wins the physics test by 52.4% and floating-point math by 41.2%.

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

A: The Intel Xeon w9-3575X supports eight-channel DDR5 with 307.2 GB/s of bandwidth, while the AMD Ryzen 9 PRO 9965 supports dual-channel DDR5 with 89.6 GB/s.

Q: Which processor has more cores and threads?

A: The Intel Xeon w9-3575X has 44 cores and 88 threads, while the AMD Ryzen 9 PRO 9965 has 16 cores and 32 threads.

Q: Do both processors support ECC memory?

A: Yes, both the AMD Ryzen 9 PRO 9965 and the Intel Xeon w9-3575X have ECC memory support listed as true.

Q: What is the average benchmark score for each?

A: The AMD Ryzen 9 PRO 9965 has an average benchmark score of 145,728, while the Intel Xeon w9-3575X has an average score of 144,323. The AMD part is 1% ahead of the Intel part in the nearestRivals comparison.

The Verdict

The data presents a clear split: choose the Intel Xeon w9-3575X for maximum multi-threaded throughput. It wins 9 out of 11 head-to-head benchmarks, with margins often exceeding 25% and reaching as high as 52.4% in physics. Its 44 cores, 88 threads, 97.5 MB of L3 cache, and 307.2 GB/s of memory bandwidth make it the dominant choice for parallel computation, data compression, encryption, and any workload that scales with core count. The 340 W TDP and 4x 477 mm² die size reflect its brute-force approach.

Choose the AMD Ryzen 9 PRO 9965 for single-threaded performance and efficiency. Its 27.5% lead in single-thread tests is substantial, and its higher base and boost clocks (4.30 GHz and 5.50 GHz) make it superior for lightly-threaded tasks. The 170 W TDP is half of the Intel part's, and the 4 nm process node suggests better power efficiency per core. Its 2x 70.6 mm² die size is far smaller, and it includes integrated graphics, which the Intel part lacks. The AMD part also has a 98th percentile ranking, same as the Intel part, but its average benchmark score is slightly higher (145,728 vs 144,323).

The verdict is that the Intel Xeon w9-3575X is the right choice for users who prioritize raw parallel compute power, such as rendering, simulations, or heavy data processing, where its 18.4% to 52.4% wins in multi-threaded tests will be decisive. The AMD Ryzen 9 PRO 9965 is the right choice for users who need fast single-threaded response, lower power consumption, or a system with integrated graphics, and who are willing to sacrifice significant multi-threaded performance. The benchmark results indicate that the Intel part is a multi-threaded monster, while the AMD part is a single-threaded sprinter with better efficiency.