AMD Ryzen 9 PRO 9955 vs Intel Xeon w7-3555 Comparison

The AMD Ryzen 9 PRO 9955 and Intel Xeon w7-3555 are both 97th-percentile workstation processors, but they achieve that status through fundamentally different strategies. The Intel Xeon w7-3555 dominates the overall average benchmark score at 106,192, but the AMD Ryzen 9 PRO 9955 posts a higher average of 110,612, which places it 4.2% ahead of the Intel part in the aggregate. This split is the key to understanding these chips: the Xeon w7-3555 wins the majority of heavy multi-threaded workloads, while the Ryzen 9 PRO 9955 counterattacks with commanding single-thread performance and a specific math advantage. The benchmark data shows that the Intel part wins 8 of the 11 head-to-head tests, yet the AMD part wins the two most revealing tests for latency-sensitive and lightly-threaded tasks.

Where Each One Wins

The Intel Xeon w7-3555 is the clear victor in throughput-heavy, parallel workloads. It wins passmark_data_compression with a score of 966,970 versus 684,470, a 29.2% advantage. It also takes passmark_data_encryption (48,007 vs 33,754, a 29.7% lead) and passmark_extended_instructions (77,619 vs 54,903, a 29.3% lead). The pattern continues in floating-point math, where the Xeon scores 190,917 against the Ryzen's 121,509, a massive 36.4% margin. The Xeon also wins integer math (244,642 vs 182,312, a 25.5% lead), multithread (67,754 vs 54,866, a 19% lead), physics (5,802 vs 3,332, a 42.6% lead), and random string sorting (96,112 vs 71,928, a 25.2% lead). This is a processor built for sustained, all-core compute.

The AMD Ryzen 9 PRO 9955 wins where the workload is single-threaded or latency-bound. Its passmark_single_thread score of 4,597 crushes the Xeon's 3,549, a 29.5% advantage. The AMD part also wins passmark_find_prime_numbers with a score of 461 versus 398, a 15.8% lead, which indicates a strong integer performance per core. For tasks that rely on a single core or on quick response times, the Ryzen 9 PRO 9955 is the superior choice. It also carries the advantage in average benchmark score, meaning that when all tests are weighted equally, the AMD chip's efficiency and per-core speed make it the higher-rated processor overall.

Architecture Differences

The two CPUs are built on starkly different foundations. The AMD Ryzen 9 PRO 9955 uses the Zen 5 architecture on the Granite Ridge codename, fabricated on a 4 nm process at TSMC. It packs 16,630 million transistors across a 2x 70.6 mm² die configuration. In contrast, the Intel Xeon w7-3555 uses the Sapphire Rapids codename, built on Intel's 10 nm process, with a 4x 477 mm² die size. The process node difference is significant: the AMD chip's smaller 4 nm node allows for higher clock speeds at lower power, while the Intel chip's larger 10 nm node requires a much higher thermal envelope.

Core counts diverge sharply. The AMD part offers 12 cores and 24 threads, while the Intel part offers 28 cores and 56 threads. This 16-core and 32-thread difference explains the Intel part's dominance in parallel workloads. However, the AMD part compensates with a base clock of 3.40 GHz and a boost clock of 5.40 GHz, compared to the Intel part's 2.70 GHz base and 4.80 GHz boost. The cache hierarchy also differs: both have 80 KB of L1 per core, but the AMD part has 1 MB of L2 per core versus the Intel part's 2 MB per core. The L3 cache is 64 MB for the AMD part and 75 MB for the Intel part, giving the Intel chip a slight edge in total L3 capacity.

Memory architecture is another differentiator. The AMD Ryzen 9 PRO 9955 supports dual-channel DDR5 memory with a bandwidth of 89.6 GB/s, while the Intel Xeon w7-3555 supports eight-channel DDR5 with a bandwidth of 307.2 GB/s. Both support ECC memory, but the Intel part's eight-channel configuration provides over three times the memory bandwidth, which is crucial for data-intensive workloads. The PCIe support also differs: the AMD part offers Gen 5 with 24 lanes, while the Intel part offers Gen 5 with 112 lanes. Finally, the AMD part includes integrated Radeon Graphics, while the Intel part has no integrated graphics, and the AMD part uses the AMD Socket AM5 while the Intel part uses the Intel Socket 4677.

Head-to-Head Benchmarks

The data reveals a clear pattern of the Intel Xeon w7-3555 winning through raw core count and memory bandwidth, while the AMD Ryzen 9 PRO 9955 wins through clock speed and per-core efficiency. The largest Intel win is in passmark_physics, where it scores 5,802 against the AMD's 3,332, a 42.6% margin. This test likely benefits from the Xeon's 28 cores and 56 threads, which allow it to process many parallel physics calculations simultaneously. The second-largest Intel win is in floating-point math, where the 36.4% lead (190,917 vs 121,509) underscores the Xeon's strength in scientific and engineering workloads that rely heavily on FPU throughput.

The Intel part also shows a consistent 25-30% advantage in memory and encryption tasks. In data compression, it leads by 29.2% (966,970 vs 684,470); in data encryption, by 29.7% (48,007 vs 33,754); and in extended instructions, by 29.3% (77,619 vs 54,903). These results align with the Xeon's eight-channel memory bandwidth of 307.2 GB/s, which is 3.4 times the AMD part's 89.6 GB/s. The Intel part also wins integer math by 25.5% (244,642 vs 182,312), random string sorting by 25.2% (96,112 vs 71,928), and the multithread test by 19% (67,754 vs 54,866).

The AMD Ryzen 9 PRO 9955's wins are fewer but decisive. The 29.5% single-thread victory (4,597 vs 3,549) is the largest margin for the AMD part and illustrates the benefit of its 5.40 GHz boost clock. The AMD part also wins the find prime numbers test by 15.8% (461 vs 398), which suggests a strong integer math throughput per core. These wins indicate that for single-threaded applications, database queries, or lightly-threaded code, the AMD part will feel snappier and more responsive.

Specification Differences

The two processors differ in nearly every fundamental specification. The AMD Ryzen 9 PRO 9955 has 12 cores and 24 threads, while the Intel Xeon w7-3555 has 28 cores and 56 threads. The AMD part has a base clock of 3.40 GHz and a boost clock of 5.40 GHz, while the Intel part has a base clock of 2.70 GHz and a boost clock of 4.80 GHz. The thermal design power (TDP) is 120 W for the AMD part and 325 W for the Intel part, a significant difference in power consumption and cooling requirements.

The process node is 4 nm for the AMD part and 10 nm for the Intel part, with the AMD part using TSMC as the foundry and the Intel part using Intel's own fabs. The die size is 2x 70.6 mm² for the AMD part and 4x 477 mm² for the Intel part. The cache configuration differs: L2 cache is 1 MB per core for the AMD part and 2 MB per core for the Intel part, while L3 cache is 64 MB for the AMD part and 75 MB for the Intel part. Memory support is dual-channel DDR5 for the AMD part and eight-channel DDR5 for the Intel part, with bandwidths of 89.6 GB/s and 307.2 GB/s respectively.

The PCIe lanes are 24 for the AMD part and 112 for the Intel part, both Gen 5. The AMD part includes integrated Radeon Graphics, while the Intel part has no integrated graphics. The sockets are AMD Socket AM5 for the AMD part and Intel Socket 4677 for the Intel part. The release dates differ: the AMD part was released on 2026-06-29, while the Intel part was released on 2024-08-23. The Intel Xeon w7-3555 has a launch MSRP of $2339; the AMD part has no listed launch MSRP. Both parts are production-active and have locked multipliers.

FAQ

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

A: The AMD Ryzen 9 PRO 9955 has a passmark_single_thread score of 4,597, which is 29.5% higher than the Intel Xeon w7-3555's score of 3,549.

Q: Which processor wins the most head-to-head benchmarks?

A: The Intel Xeon w7-3555 wins 8 of the 11 head-to-head benchmarks, while the AMD Ryzen 9 PRO 9955 wins 3.

Q: How much faster is the Intel Xeon w7-3555 in multi-threaded workloads?

A: The Intel part wins the passmark_multithread test with a score of 67,754 versus the AMD part's 54,866, a 19% advantage.

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

A: The Intel Xeon w7-3555 supports eight-channel DDR5 with 307.2 GB/s bandwidth, while the AMD Ryzen 9 PRO 9955 supports dual-channel DDR5 with 89.6 GB/s bandwidth.

Q: Which processor has more cores and threads?

A: The Intel Xeon w7-3555 has 28 cores and 56 threads, while the AMD Ryzen 9 PRO 9955 has 12 cores and 24 threads.

Q: What is the average benchmark score for each processor?

A: The AMD Ryzen 9 PRO 9955 has an average benchmark score of 110,612, while the Intel Xeon w7-3555 has an average score of 106,192. The AMD part is 4.2% higher.

The Verdict

The data points to a clear split: choose the Intel Xeon w7-3555 for parallel, multi-threaded, and memory-bandwidth-hungry workloads. Its 28 cores and 56 threads, combined with 307.2 GB/s of memory bandwidth, deliver decisive wins in physics (42.6% ahead), floating-point math (36.4% ahead), and data compression (29.2% ahead). This is the processor for heavy rendering, scientific simulations, and data analytics that can utilize every core and every memory channel.

Choose the AMD Ryzen 9 PRO 9955 for single-threaded performance and per-core efficiency. Its 29.5% lead in single-thread scores and 15.8% lead in prime number finding make it the better choice for latency-sensitive applications, interactive workloads, and code that does not scale perfectly across many cores. The AMD part also has a higher average benchmark score (110,612 vs 106,192), indicating that across a broad mix of tests, it is the more balanced performer. Its lower TDP of 120 W versus 325 W also suggests easier cooling and lower power draw, though the Intel part offers far more expansion with 112 PCIe lanes versus 24. The verdict is simple: the Intel Xeon w7-3555 is a brute-force parallel processor, while the AMD Ryzen 9 PRO 9955 is a high-frequency specialist with superior single-thread agility.