AMD Ryzen 9 9955HX3D vs Intel Xeon 658X Comparison

Head-to-Head Benchmarks

The recorded head-to-head results show a dominant performance profile for the Intel Xeon 658X, which wins 13 of the 15 compared workloads. The AMD Ryzen 9 9955HX3D takes the remaining two, both in single-threaded PassMark tests. This split is not subtle: the Xeon 658X leads by double digits in most categories, while the Ryzen's wins are narrow by comparison and confined to a single metric family.

The largest margin belongs to the Cinebench R23 single-core test. Here the Intel Xeon 658X scores 8818 against 2159.5 for the AMD part, a delta of 308.3%. That is an enormous gap, though it reflects the different operating contexts of the two processors: the Xeon is a server/workstation part with a 250 W TDP, while the Ryzen is a mobile processor with a 55 W TDP. The Xeon also leads Cinebench R15 single-core by 167.5%, scoring 888 versus 332. These two results alone establish that in lightly threaded rendering, the Xeon 658X is not merely ahead, it is in a different performance class.

Multi-core rendering tells a similar story, albeit with smaller margins. In Cinebench R23 multi-core, the Xeon 658X posts 62466 against 38161.5, a 63.7% advantage. In Cinebench R15 multi-core, the lead narrows to 4.2% (6296 versus 6042.5), suggesting that the older R15 workload does not scale as aggressively with the Xeon's 24 cores and 48 threads. Still, the Xeon wins that test too. The Ryzen 9 9955HX3D has 16 cores and 32 threads, so the Xeon's core and thread advantage is expected to show in multi-threaded workloads, and the data confirms it.

PassMark results reinforce the pattern. The Xeon 658X leads data compression by 35.2% (1062062 versus 785811), data encryption by 32.7% (52357 versus 39446), extended instructions by 34.7% (84626 versus 62813), and floating point math by 46% (210480 versus 144122). Integer math shows a smaller edge at 18.6% (263995 versus 222503), and find prime numbers is 23.6% ahead (649 versus 525). Physics simulation favors the Xeon by 38% (6470 versus 4687), while random string sorting is 23.4% ahead (103028 versus 83497). The PassMark multithread score gives the Xeon a 17.3% lead (73490 versus 62674).

The only two victories for the AMD Ryzen 9 9955HX3D come in the PassMark single-thread and singlethread tests, which are identical in score (4511) and both show a 17.4% advantage over the Xeon's 3728. This is a meaningful result: in a workload that is purely single-threaded and does not scale with core count, the Ryzen's higher boost clock of 5.40 GHz against the Xeon's 4.90 GHz shows up in the data. The Ryzen also has a higher clock speed headroom in a much lower thermal envelope, which is notable for a mobile part.

Looking at the broader benchmark averages, the Xeon 658X sits at 116060 average score, which places it in the 97th percentile of all CPUs in the database. Its nearest rivals are all within a narrow band: the AMD EPYC 9255 at 116388 (0.3% higher), the Intel Xeon 6527P at 115190 (0.8% lower), the Intel Xeon w7-3565X at 118307 (1.9% lower), and the AMD EPYC 9384X at 120427 (3.6% lower). The Ryzen 9 9955HX3D, by contrast, has an average score of 97453 and sits in the 96th percentile. Its nearest rivals are the AMD Ryzen Threadripper PRO 5965WX at 98504 (1.1% higher), the AMD Ryzen 9 PRO 9945 at 96083 (1.4% lower), the AMD EPYC 4565P at 95764 (1.8% lower), and the AMD EPYC 9175F at 95615 (1.9% lower). The absolute gap in average score between the two parts is 18607 points, about 19.1% in favor of the Xeon.

The head-to-head deltas are consistent with the average score gap. Out of the 15 compared workloads, the Xeon leads by at least 17% in all but one of its wins, and the single exception (Cinebench R15 multi-core at 4.2%) still favors Intel. The Ryzen's two wins are both at 17.4%, which is a solid margin but not enough to offset the Xeon's dominance across the rest of the suite.

The Verdict

The data points to a clear conclusion: the Intel Xeon 658X is the stronger processor in almost every measured workload. It wins 13 of 15 head-to-head tests, leads by 63.7% in Cinebench R23 multi-core, and holds a 19.1% advantage in average benchmark score. Anyone selecting between these two for sustained multi-threaded work, rendering, data compression, encryption, or physics simulation should favor the Xeon based on these results alone.

The AMD Ryzen 9 9955HX3D is not without merit. Its single-thread PassMark score is 17.4% higher than the Xeon's, and it achieves that with a 55 W TDP against the Xeon's 250 W. For workloads that are purely single-threaded and latency-sensitive, the Ryzen is the better choice according to the recorded data. It also carries an integrated GPU (Radeon 610M), which the Xeon lacks, and it is a mobile processor by market segment. The Xeon is a server/workstation part on Intel Socket 4710 with an eight-channel memory bus and 409.6 GB/s memory bandwidth, while the Ryzen uses a dual-channel bus with 89.6 GB/s. Those differences are not directly benchmarked here, but they explain the performance separation.

For a buyer who needs maximum single-thread responsiveness in a low-power mobile form factor, the Ryzen 9 9955HX3D is the only logical pick from these two. For anyone else, the Xeon 658X is the data-backed winner. The Xeon's 97th percentile standing and its average score of 116060 put it ahead of the Ryzen's 96th percentile and 97453 average. The verdict is straightforward: choose the Xeon for compute density and throughput, choose the Ryzen for single-thread speed and power efficiency.

FAQ

Q: Which processor wins more head-to-head tests?

A: The Intel Xeon 658X wins 13 of the 15 compared workloads. The AMD Ryzen 9 9955HX3D wins the remaining 2, both PassMark single-thread tests.

Q: How large is the Xeon's lead in multi-core rendering?

A: In Cinebench R23 multi-core, the Xeon 658X scores 62466 against 38161.5 for the Ryzen, a 63.7% advantage. In Cinebench R15 multi-core, the lead is 4.2% (6296 versus 6042.5).

Q: Does the Ryzen 9 9955HX3D win any benchmark by a large margin?

A: Yes, in PassMark single-thread and singlethread tests, the Ryzen scores 4511 versus 3728 for the Xeon, a 17.4% advantage in both.

Q: How do the two processors compare in average benchmark score?

A: The Xeon 658X has an average score of 116060, placing it in the 97th percentile. The Ryzen 9 9955HX3D has an average score of 97453, placing it in the 96th percentile.

Q: What are the nearest rivals for each processor in the database?

A: For the Xeon 658X, the nearest rivals are the AMD EPYC 9255 (116388, 0.3% higher), Intel Xeon 6527P (115190, 0.8% lower), Intel Xeon w7-3565X (118307, 1.9% lower), and AMD EPYC 9384X (120427, 3.6% lower). For the Ryzen 9 9955HX3D, they are the AMD Ryzen Threadripper PRO 5965WX (98504, 1.1% higher), AMD Ryzen 9 PRO 9945 (96083, 1.4% lower), AMD EPYC 4565P (95764, 1.8% lower), and AMD EPYC 9175F (95615, 1.9% lower).

Q: Which processor has the higher single-thread PassMark score?

A: The AMD Ryzen 9 9955HX3D, with 4511 against 3728 for the Intel Xeon 658X. That is a 17.4% difference.

Specification Differences

The Intel Xeon 658X and AMD Ryzen 9 9955HX3D differ across nearly every core specification. The Xeon has 24 cores and 48 threads, while the Ryzen has 16 cores and 32 threads. Base clocks are 3.00 GHz for the Xeon and 2.50 GHz for the Ryzen. Boost clocks are 4.90 GHz for the Xeon and 5.40 GHz for the Ryzen. The Xeon carries a 250 W TDP, the Ryzen a 55 W TDP.

The memory subsystem separates them further. The Xeon uses an eight-channel DDR5 bus with 409.6 GB/s memory bandwidth, while the Ryzen uses a dual-channel DDR5 bus with 89.6 GB/s. Both support ECC memory. PCIe connectivity also differs: the Xeon provides Gen 5 with 128 lanes (CPU only), the Ryzen provides Gen 5 with 28 lanes (CPU only). The Xeon has no integrated graphics, while the Ryzen includes a Radeon 610M iGPU.

The Xeon is a server/workstation part on Intel Socket 4710, while the Ryzen is a mobile part on AMD Socket FL1. The Xeon's launch MSRP is $1699. The Ryzen has no recorded launch MSRP. Both have an unlocked multiplier. The Xeon's release date is listed as 2026-02-01, while the Ryzen's is 2025-01-05. Both are marked as active in production.

Architecture Differences

The two processors come from different architectural lineages. The Intel Xeon 658X is built on Granite Rapids, a 5 nm process from Intel, with a die size of 2x 598 mm². The AMD Ryzen 9 9955HX3D is built on Zen 5 (Fire Range), a 4 nm process from TSMC, with a die size of 2x 70.6 mm² and 16,630 million transistors. The Xeon's cache layout includes 112 KB L1 per core, 2 MB L2 per core, and 144 MB shared L3. The Ryzen has 80 KB L1 per core, 1 MB L2 per core, and 128 MB L3. Neither part lists a 3D V-Cache field.

The Xeon's generation is listed as Xeon 600 (Granite Rapids-WS), while the Ryzen's generation is Ryzen 9 (Zen 5 (Fire Range)). The Xeon has no recorded transistor count, while the Ryzen lists 16,630 million transistors. The Xeon's foundry is Intel, the Ryzen's is TSMC. The Xeon's process node is 5 nm, the Ryzen's is 4 nm. The Xeon's memory bandwidth is 409.6 GB/s against 89.6 GB/s for the Ryzen. The Xeon's PCIe lane count is 128, the Ryzen's is 28. The Ryzen includes an integrated Radeon 610M GPU, which the Xeon does not have. These architectural differences align with the benchmark results: the Xeon's larger core count, bigger L3 cache, and vastly higher memory bandwidth support its multi-threaded dominance, while the Ryzen's smaller process node and higher boost clock enable its single-thread PassMark edge.