AMD Ryzen 9 9850HX vs Intel Xeon 658X Comparison

The Verdict

The data is unambiguous about the split between these two. The Intel Xeon 658X is the compute monster for heavily parallel, sustained workloads; it wins 9 of 11 head-to-head benchmarks and delivers its largest advantages in physics and prime-number work, where it is more than double the AMD Ryzen 9 9850HX. The AMD Ryzen 9 9850HX is the single-thread champion, beating the Xeon by 16.4% in PassMark's single-thread test, and it does so while drawing a fraction of the power budget. If your work scales across many cores and you have the cooling and power headroom of a workstation, the Xeon 658X is the clear pick. If you need the fastest possible response in lightly threaded tasks and care about keeping power draw low, the Ryzen 9 9850HX is the one to choose. Both parts sit at the 97th percentile of all CPUs, so neither is a slouch, but their strengths point in very different directions.

Architecture Differences

The Xeon 658X is built on Intel's Granite Rapids architecture at a 5 nm process node and is fabricated by Intel itself. It is a 24-core, 48-thread part with a dual-die design (2x 598 mm²) and a massive 144 MB of shared L3 cache. Each core gets 112 KB of L1 and 2 MB of L2. The Ryzen 9 9850HX uses AMD's Zen 5 architecture (Fire Range codename) on a 4 nm TSMC process, with 12 cores and 24 threads across two 70.6 mm² dies, totaling 16,630 million transistors. Its L3 is 64 MB, with 80 KB L1 and 1 MB L2 per core. The process node difference is notable: AMD's 4 nm TSMC process is denser, but Intel's dual-die package with larger dies gives the Xeon far more cache and core count.

Memory architecture separates them even further. The Xeon 658X supports DDR5 over an eight-channel memory bus, yielding 409.6 GB/s of bandwidth. The Ryzen 9 9850HX also supports DDR5 but over a dual-channel bus, capping out at 89.6 GB/s. That is a 4.6x bandwidth advantage for the Intel part. PCIe lanes tell a similar story: the Xeon provides 128 Gen 5 lanes (CPU only) versus 28 for the Ryzen. Both support ECC memory, and both have unlocked multipliers. The Xeon has no integrated graphics; the Ryzen includes a Radeon 610M iGPU. The Xeon targets the server/workstation segment with a 250 W TDP, while the Ryzen is a mobile part at 55 W TDP. The Xeon was released later (2026-02) and carries a launch MSRP of $1699; the Ryzen launched in 2025-01 with no MSRP listed.

Head-to-Head Benchmarks

The Xeon 658X wins every multi-threaded benchmark by substantial margins. In PassMark's physics test, the Xeon scores 6470 versus 3054, a 111.9% lead. Prime-number finding shows a similar story: 649 versus 323, a 100.9% advantage. Floating-point math is 82.9% ahead (210480 vs 115062). Data encryption shows a 62.9% edge (52357 vs 32139), and data compression is 60.3% higher (1062062 vs 662381). Extended instructions land at 57.2% (84626 vs 53817). Integer math is 52.6% better (263995 vs 172943). Random string sorting is 46.8% ahead (103028 vs 70175). Even the multithread score, which aggregates overall parallel performance, shows the Xeon leading by 42.1% (73490 vs 51722).

The Ryzen 9 9850HX's only wins come in single-threaded tests. In PassMark single-thread, it scores 4461 versus 3728, a 16.4% advantage for AMD. The same margin appears in the duplicate singlethread entry. This is not a small gap—16.4% is significant for applications that depend on a single core's speed, like older games or certain scripting workloads. But it is the only category where AMD leads, and it does not offset the Xeon's dominance in all other measured areas.

Looking at the broader context, the Xeon 658X's average benchmark score is 116060, putting it in the 97th percentile. Its nearest rivals are the AMD EPYC 9255 (delta -0.3%), Intel Xeon 6527P (delta 0.8%), Intel Xeon w7-3565X (delta -1.9%), and AMD EPYC 9384X (delta -3.6%). The Ryzen 9 9850HX averages 106413, also 97th percentile, with rivals including the Intel Xeon w7-3555 (delta 0.2%), Intel Xeon 6521P (delta 0.5%), Intel Xeon w7-2595X (delta -2.1%), and AMD EPYC 8324P (delta 3%). The Xeon 658X is roughly 9% faster on average than the Ryzen 9 9850HX, which aligns with the head-to-head data.

Specification Differences

| Field | Intel Xeon 658X | AMD Ryzen 9 9850HX |

|---|---|---|

| Cores | 24 | 12 |

| Threads | 48 | 24 |

| Boost Clock | 4.90 GHz | 5.20 GHz |

| TDP | 250 W | 55 W |

| Socket | Intel Socket 4710 | AMD Socket FL1 |

| Architecture | Granite Rapids | Zen 5 (Fire Range) |

| Process Node | 5 nm (Intel) | 4 nm (TSMC) |

| Die Size | 2x 598 mm² | 2x 70.6 mm² |

| Transistors | Not listed | 16,630 million |

| L1 Cache | 112 KB per core | 80 KB per core |

| L2 Cache | 2 MB per core | 1 MB per core |

| L3 Cache | 144 MB shared | 64 MB |

| Memory Bus | Eight-channel | Dual-channel |

| Memory Bandwidth | 409.6 GB/s | 89.6 GB/s |

| PCIe Lanes | 128 (Gen 5, CPU only) | 28 (Gen 5, CPU only) |

| Integrated Graphics | N/A | Radeon 610M |

| Market Segment | Server/Workstation | Mobile |

| Release Date | 2026-02-01 | 2025-01-05 |

| Launch MSRP | $1699 | Not listed |

Both have a 3.00 GHz base clock and both support DDR5 and ECC memory. Both have unlocked multipliers. The Xeon's boost clock is 4.90 GHz versus 5.20 GHz for the Ryzen, but the Ryzen's higher boost does not overcome the Xeon's core-count advantage in multi-threaded tests.

FAQ

Q: Which CPU is better for multi-threaded workloads?

A: The Intel Xeon 658X wins all nine multi-threaded head-to-head benchmarks, with leads ranging from 42.1% in multithread to 111.9% in physics. Its 24 cores and 48 threads versus 12 cores and 24 threads for the Ryzen, plus 144 MB L3 versus 64 MB, drive these results.

Q: Is the AMD Ryzen 9 9850HX faster in any test?

A: Yes. The Ryzen 9 9850HX wins the PassMark single-thread test with a score of 4461 versus 3728, a 16.4% advantage. It also has a higher boost clock at 5.20 GHz versus 4.90 GHz.

Q: How do their memory bandwidths compare?

A: The Xeon 658X has an eight-channel memory bus delivering 409.6 GB/s, while the Ryzen 9 9850HX has a dual-channel bus at 89.6 GB/s. The Xeon's bandwidth is about 4.6 times higher.

Q: Which CPU has more PCIe lanes?

A: The Xeon 658X provides 128 Gen 5 lanes (CPU only) versus 28 Gen 5 lanes for the Ryzen 9 9850HX. This makes the Xeon far better suited for multi-GPU or high-density storage configurations.

Q: Do both CPUs support ECC memory?

A: Yes, both the Intel Xeon 658X and the AMD Ryzen 9 9850HX support ECC memory.

Q: Which CPU is more power-efficient?

A: The Ryzen 9 9850HX has a 55 W TDP versus 250 W for the Xeon 658X. Despite the Xeon's higher average benchmark score (116060 vs 106413), it draws over four times the power. The Ryzen achieves its single-thread win at a fraction of the power draw.

Where Each One Wins

The Intel Xeon 658X wins in every scenario that demands raw multi-threaded throughput. Data compression jobs see a 60.3% advantage, which directly translates to faster file archiving, database compression, and backup processing. Encryption workloads are 62.9% faster, meaning the Xeon handles secure data transfers and VPN termination with significantly less latency. Floating-point math at 82.9% higher throughput benefits scientific computing, financial modeling, and rendering. The 100.9% lead in prime-number finding points to cryptography and number-theory workloads. Physics simulations at 111.9% higher performance make the Xeon the obvious choice for engineering simulation and computational physics. Its 144 MB L3 cache and eight-channel memory bandwidth (409.6 GB/s) feed these cores effectively, and 128 PCIe lanes allow expansive I/O. The Xeon's 250 W TDP is a cost, but for a server/workstation with adequate cooling, the performance-per-core in parallel tasks is unmatched in this comparison.

The AMD Ryzen 9 9850HX wins in single-threaded responsiveness. Its 16.4% lead in PassMark single-thread is meaningful for applications that cannot parallelize—legacy software, certain game engines, or interactive scripting. The 5.20 GHz boost clock is the highest of the two, and the 55 W TDP makes it viable in compact mobile systems where the Xeon's 250 W TDP would be impossible to cool. The Ryzen's 28 PCIe lanes and dual-channel memory are enough for a mobile workstation, and its integrated Radeon 610M eliminates the need for a discrete GPU in basic display tasks. For a laptop user who prioritizes snappy single-core performance and battery-friendly operation over massive parallel compute, the Ryzen 9 9850HX is the right pick. The Xeon is not a mobile part; it belongs in a chassis with serious cooling and power delivery. Choose based on where your workloads sit on the parallel spectrum—the data shows the Xeon dominates the heavy end, and the Ryzen owns the light end.