AMD EPYC 7642 vs AMD Ryzen 9 9850HX Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive split between these two processors. The AMD EPYC 7642 wins 9 of the 11 shared benchmark comparisons, while the AMD Ryzen 9 9850HX takes the remaining 2, both in single-threaded workloads. The margin of victory in each direction is substantial, but the character of those wins is entirely different.

Starting with the largest gap, the EPYC 7642 leads by 168.8% in PassMark data encryption, scoring 86,397 against 32,139 for the Ryzen 9 9850HX. This is the single biggest delta in the entire comparison. Data compression also heavily favors the server chip, with the EPYC 7642 scoring 1,195,584 versus 662,381, a lead of 80.5%. Integer math follows a similar pattern: 305,303 versus 172,943, a 76.5% advantage for the EPYC 7642. Floating-point math shows a 58.1% gap, with scores of 181,887 and 115,062 respectively.

The EPYC 7642 also wins in PassMark physics, scoring 5,098 against 3,054, a 66.9% advantage. Random string sorting goes to the EPYC 7642 by 63.7%, with scores of 114,871 and 70,175. Find prime numbers shows a 53.6% lead for the EPYC 7642, at 496 versus 323. Extended instructions favor the EPYC 7642 by 27.9%, with scores of 68,841 and 53,817. Even the multithread score, the closest of the EPYC 7642's wins, shows a 13.7% advantage: 58,795 versus 51,722.

The Ryzen 9 9850HX wins both single-thread tests, and it wins by a wide margin. The PassMark single-thread score is 4,461 for the Ryzen 9 9850HX against 2,052 for the EPYC 7642, a 54% advantage. The duplicate PassMark single-thread result confirms the same figures. This is the only category where the mobile chip leads, but the lead is consistent and large.

Looking at the broader context, the EPYC 7642 sits at the 97th percentile among all CPUs, with an average benchmark score of 124,006. Its nearest rivals are the AMD Ryzen Threadripper PRO 5975WX at 124,171 (a 0.1% difference), the Intel Xeon 6730P at 124,756 (0.6% lower), and the AMD EPYC 9354 at 126,810 (2.2% lower). The AMD EPYC 9384X trails by 3%. The Ryzen 9 9850HX also ranks at the 97th percentile, with an average benchmark score of 106,413. Its nearest rivals include the Intel Xeon w7-3555 at 106,192 (0.2% lower), the Intel Xeon 6521P at 105,845 (0.5% lower), and the Intel Xeon w7-2595X at 108,663 (2.1% higher). The AMD EPYC 8324P trails by 3%.

The average benchmark score gap between the two chips is 17,593 points, or about 16.5% in favor of the EPYC 7642. Yet the single-thread result flips the narrative entirely for workloads that depend on one core. The data indicates that these two processors are not competing for the same tasks; they are optimized for fundamentally different execution profiles.

The Verdict

The benchmark data points to a clear conclusion: the AMD EPYC 7642 is the choice for heavily threaded, throughput-oriented workloads, while the AMD Ryzen 9 9850HX is the choice for single-thread-sensitive applications where per-core speed matters more than raw core count.

Buyers who need maximum parallel compute, such as large-scale data compression, encryption, or mathematical workloads, should look at the EPYC 7642. Its wins in 9 of 11 comparisons, including an 80.5% lead in data compression and a 168.8% lead in data encryption, make it the dominant option for server and workstation environments. The multithread score, while the narrowest EPYC 7642 win at 13.7%, still confirms that even in the most balanced workload, the server chip holds the advantage.

Buyers who prioritize responsiveness in single-threaded applications, such as interactive workloads or lightly threaded software, should look at the Ryzen 9 9850HX. Its 54% single-thread lead over the EPYC 7642 is not marginal; it is a decisive advantage. The mobile chip also offers a much lower TDP of 55 watts against 225 watts, which matters for portable systems, though the EPYC 7642's power draw is typical for its server segment.

The Ryzen 9 9850HX is unlocked, meaning the multiplier can be adjusted, whereas the EPYC 7642 is locked. This gives the mobile chip flexibility for enthusiasts, though the data does not show how much headroom exists beyond the recorded scores. The EPYC 7642 remains the stronger overall performer in aggregate benchmarks, with an average score of 124,006 versus 106,413 for the Ryzen 9 9850HX.

FAQ

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

A: The AMD Ryzen 9 9850HX scores 4,461 in PassMark single-thread, compared to 2,052 for the AMD EPYC 7642, a 54% advantage.

Q: How much faster is the EPYC 7642 in data encryption?

A: The EPYC 7642 scores 86,397 in PassMark data encryption, while the Ryzen 9 9850HX scores 32,139. That is a 168.8% lead for the EPYC 7642.

Q: Do both processors rank at the same percentile among all CPUs?

A: Yes, both sit at the 97th percentile. However, the EPYC 7642 has a higher average benchmark score of 124,006, while the Ryzen 9 9850HX averages 106,413.

Q: Which chip has more cores and threads?

A: The EPYC 7642 has 48 cores and 96 threads. The Ryzen 9 9850HX has 12 cores and 24 threads.

Q: What is the multithread score difference?

A: The EPYC 7642 scores 58,795 in PassMark multithread, and the Ryzen 9 9850HX scores 51,722. The EPYC 7642 leads by 13.7%.

Q: Is the Ryzen 9 9850HX overclockable?

A: Yes, the multiplier is unlocked on the Ryzen 9 9850HX. The EPYC 7642 has a locked multiplier.

Specification Differences

The core and thread counts differ substantially. The EPYC 7642 offers 48 cores and 96 threads, while the Ryzen 9 9850HX offers 12 cores and 24 threads. Clock speeds also diverge: the EPYC 7642 has a base clock of 2.40 GHz and a boost clock of 3.40 GHz, while the Ryzen 9 9850HX has a base clock of 3.00 GHz and a boost clock of 5.20 GHz. The TDP ratings are 225 watts for the EPYC 7642 and 55 watts for the Ryzen 9 9850HX.

The sockets are different: the EPYC 7642 uses AMD Socket SP3, while the Ryzen 9 9850HX uses AMD Socket FL1. Memory support also differs, with the EPYC 7642 using DDR4 across an eight-channel bus with 204.8 GB/s bandwidth, and the Ryzen 9 9850HX using DDR5 across a dual-channel bus with 89.6 GB/s bandwidth. Both support ECC memory. The PCIe generation differs as well: the EPYC 7642 supports Gen 4, while the Ryzen 9 9850HX supports Gen 5 with 28 lanes (CPU only). The Ryzen 9 9850HX includes integrated Radeon 610M graphics, while the EPYC 7642 has no integrated graphics. The Ryzen 9 9850HX has an unlocked multiplier; the EPYC 7642 does not. Release dates are also far apart: the EPYC 7642 launched on 2019-08-06, and the Ryzen 9 9850HX launched on 2025-01-05.

Architecture Differences

The EPYC 7642 belongs to the EPYC 7002 series, built on the Zen 2 architecture with the codename Rome. It uses a 7 nm process node from TSMC and integrates 3,800 million transistors on a 74 mm² die. The Ryzen 9 9850HX belongs to the 9000 series, built on the Zen 5 architecture with the codename Fire Range. It uses a 4 nm process node from TSMC and integrates 16,630 million transistors across a 2x 70.6 mm² die configuration. The cache layouts differ as well. The EPYC 7642 has 96 KB of L1 per core, 512 KB of L2 per core, and 256 MB of shared L3 cache. The Ryzen 9 9850HX has 80 KB of L1 per core, 1 MB of L2 per core, and 64 MB of L3 cache. The market segments are distinct: the EPYC 7642 targets server and workstation use, while the Ryzen 9 9850HX targets mobile systems. Both are currently active in production.

Where Each One Wins

The EPYC 7642 wins in every multithreaded and throughput-oriented benchmark in the comparison. Data compression, data encryption, extended instructions, find prime numbers, floating-point math, integer math, multithread, physics, and random string sorting all go to the server chip. The margins range from 13.7% in multithread to 168.8% in data encryption. This makes the EPYC 7642 the clear pick for database workloads, scientific computing, virtualization, and any application that can use its 48 cores and 96 threads. Its 256 MB of shared L3 cache and eight-channel DDR4 memory interface further reinforce its suitability for memory-heavy server tasks.

The Ryzen 9 9850HX wins in single-thread performance, with a 54% lead over the EPYC 7642 in PassMark single-thread. This makes it the better option for applications that rely on one or a few fast cores, such as certain interactive tools, legacy software, or workloads where clock speed is the limiting factor. Its 5.20 GHz boost clock, unlocked multiplier, and 55 watt TDP also make it more appropriate for mobile platforms where power efficiency and thermal headroom are limited. The Ryzen 9 9850HX also supports DDR5 and PCIe Gen 5, which are newer standards than the EPYC 7642's DDR4 and PCIe Gen 4, though the EPYC 7642's eight-channel memory bus provides far higher aggregate bandwidth. The integrated Radeon 610M graphics on the Ryzen 9 9850HX means it can handle display output without a discrete GPU, a feature the EPYC 7642 lacks entirely.