AMD EPYC 4345P vs AMD Ryzen AI 9 HX PRO 370 Comparison

Where Each One Wins

The benchmark data presents an unusually one-sided comparison. Across the 15 recorded head-to-head tests, the AMD EPYC 4345P claims victory in every single discipline. The Ryzen AI 9 HX PRO 370 does not register a single win in any of the measured workloads, making the use-case split remarkably clear: if the workload is compute-bound, the EPYC part takes it.

The EPYC 4345P's largest advantages appear in heavily threaded rendering workloads. In Cinebench R23 multi-core, it scores 32,020 against the Ryzen AI 9 HX PRO 370's 18,520, a commanding 42.2% lead. That gap shrinks somewhat in Cinebench R15 multi-core, where the EPYC's 3,227 edges out the mobile chip's 3,178 by just 1.5%. The difference in single-core performance is even more pronounced, with the EPYC delivering 4,520 in Cinebench R23 single-core versus 1,992 for the Ryzen AI part, a 55.9% advantage. The R15 single-core test shows a similar story: 455 versus 309, a 32.1% gap.

In synthetic PassMark workloads, the EPYC maintains its lead across the board, though the margins vary considerably. The closest contest is floating-point math, where the EPYC's 74,255 barely outpaces the Ryzen AI's 73,493, a mere 1% difference. Integer math is similarly tight at 3%, with scores of 123,774 and 120,016 respectively. Data compression sees the EPYC ahead by 4.4% (421,490 versus 403,113), while random string sorting shows a 5.3% edge (46,238 versus 43,767). The multi-threaded PassMark test gives the EPYC a 7.7% win (36,123 versus 33,349).

Where the EPYC truly runs away is in physics simulation and prime number finding. The physics test shows a 26.8% advantage (2,583 versus 1,892), while prime number calculation has the EPYC ahead by 21.6% (167 versus 131). Data encryption (23,313 versus 20,788, a 10.8% gap) and extended instructions (31,663 versus 28,165, an 11% gap) also favor the server chip substantially. Even the single-thread PassMark score, often a strong suit for mobile processors, goes to the EPYC by 9.2% (4,408 versus 4,003).

The conclusion is inescapable: the EPYC 4345P is the performance winner in every measured category. The Ryzen AI 9 HX PRO 370's only consolation is that its average benchmark score of 50,448 sits just 4.1% below the EPYC's 48,470, a quirk of how the averaging weights the disparate test results. In direct competition, however, the data shows no scenario where the mobile chip emerges ahead.

The Verdict

The choice between these two processors depends entirely on the intended use case, but the data does not leave much room for ambiguity. The AMD EPYC 4345P is the faster processor in every single benchmark recorded in the database. It delivers substantially higher scores in both single-threaded and multi-threaded workloads, with its most dominant performance coming in Cinebench R23 single-core, where it outperforms the Ryzen AI 9 HX PRO 370 by 55.9%.

For anyone building a system where raw compute performance is the priority, the EPYC 4345P is the clear pick. Its 32,020 Cinebench R23 multi-core score represents a 42.2% improvement over the Ryzen AI chip, and its 4,520 single-core result is more than double the mobile processor's 1,992. The EPYC also leads in every PassMark workload, from integer math to physics simulation, making it the superior choice for rendering, scientific computing, data compression, or any CPU-intensive task.

The Ryzen AI 9 HX PRO 370 does have its place, however. It is a mobile processor on AMD Socket FP8 with a 28 TDP, designed for laptops and portable workstations. The EPYC 4345P, by contrast, is a server and workstation part with a 65 TDP on Socket AM5. The EPYC's launch MSRP is $329. The Ryzen AI part offers integrated Radeon 890M graphics, while the EPYC includes a more modest Radeon Graphics solution. For a mobile system where power efficiency and portability matter more than peak throughput, the Ryzen AI chip is the only viable option of the two.

The data also contextualizes each chip within its own competitive field. The Ryzen AI 9 HX PRO 370 sits at the 90th percentile among all CPUs, with its nearest rival being the Intel Core i9-13980HX, which scores 50,398 (a 0.1% difference). The EPYC 4345P also sits at the 90th percentile, with its closest competitor being the Intel Core i5-14600K at 48,618 (a 0.3% gap). Both chips are well-positioned in their respective markets, but the EPYC is simply the faster processor in absolute terms.

Head-to-Head Benchmarks

The head-to-head data reveals a consistent pattern of EPYC dominance, but the magnitude of the wins varies widely across workloads. The most striking result is in Cinebench R23 single-core, where the EPYC's 4,520 crushes the Ryzen AI's 1,992 by 55.9%. This is the largest delta in the entire comparison and signals a fundamental difference in how the two chips handle lightly threaded workloads. The EPYC's 5.50 GHz boost clock, compared to the Ryzen AI's 5.10 GHz, likely contributes to this gap, though the database does not speculate on clock speed alone.

Cinebench R23 multi-core tells a similar story with a 42.2% EPYC advantage (32,020 versus 18,520). Notably, the EPYC achieves this with only 8 cores and 16 threads, while the Ryzen AI packs 12 cores and 24 threads. The EPYC's 32 MB of shared L3 cache, double the Ryzen AI's 16 MB, may help explain this efficiency. The R15 multi-core test narrows the gap dramatically to just 1.5% (3,227 versus 3,178), suggesting that the shorter rendering workload does not stress the EPYC's advantages as heavily.

The physics and prime number tests show substantial EPYC leads of 26.8% and 21.6% respectively. These workloads often benefit from higher clock speeds and efficient integer execution, areas where the EPYC's 3.80 GHz base clock and 5.50 GHz boost provide clear advantages over the Ryzen AI's 2.00 GHz base and 5.10 GHz boost. The EPYC also wins the encryption test by 10.8% (23,313 versus 20,788) and extended instructions by 11% (31,663 versus 28,165), indicating superior handling of cryptographic and SIMD-style operations.

The closest contests are in floating-point math (1% EPYC lead), integer math (3% lead), and data compression (4.4% lead). These results suggest that the EPYC's advantage shrinks in purely arithmetic workloads, where the Ryzen AI's 12-core configuration can partially compensate for its lower clock speeds. The single-thread PassMark score gives the EPYC a 9.2% edge (4,408 versus 4,003), and the multi-thread PassMark shows a 7.7% lead (36,123 versus 33,349). Random string sorting rounds out the comparison with a 5.3% EPYC win (46,238 versus 43,767).

FAQ

Q: Which processor wins in single-core performance?

A: The AMD EPYC 4345P wins decisively. In Cinebench R23 single-core, it scores 4,520 against the Ryzen AI 9 HX PRO 370's 1,992, a 55.9% advantage. The R15 single-core test shows a 32.1% lead (455 versus 309), and the PassMark single-thread test gives the EPYC a 9.2% edge (4,408 versus 4,003).

Q: Does the Ryzen AI 9 HX PRO 370 win any benchmark?

A: No. Across all 15 head-to-head benchmarks recorded in the database, the Ryzen AI 9 HX PRO 370 wins zero tests. The EPYC 4345P wins all 15, with deltas ranging from 1% in floating-point math to 55.9% in Cinebench R23 single-core.

Q: How do the core and thread counts compare?

A: The Ryzen AI 9 HX PRO 370 has 12 cores and 24 threads, while the EPYC 4345P has 8 cores and 16 threads. Despite having fewer cores, the EPYC still wins every multi-threaded benchmark, including Cinebench R23 multi-core by 42.2% and PassMark multi-thread by 7.7%.

Q: What are the cache configurations?

A: Both processors have 80 KB of L1 cache per core and 1 MB of L2 cache per core. The key difference is in L3 cache: the Ryzen AI 9 HX PRO 370 has 16 MB, while the EPYC 4345P has 32 MB shared. The EPYC also has a much smaller die size at 70.6 mm² versus 233 mm².

Q: Which processor supports ECC memory?

A: Both processors support ECC memory. They also share the same dual-channel memory bus and identical memory bandwidth of 89.6 GB/s. The Ryzen AI supports DDR5 and LPDDR5X, while the EPYC supports DDR5 only.

Q: How do their PCIe capabilities differ?

A: The EPYC 4345P offers PCIe Gen 5 with 24 lanes, while the Ryzen AI 9 HX PRO 370 provides PCIe Gen 4 with 16 lanes. This gives the EPYC a significant advantage for expansion and high-speed connectivity in server or workstation builds.

Architecture Differences

The two processors share the same Zen 5 architecture and 4 nm TSMC process node, but they diverge significantly in almost every other physical and design characteristic. The Ryzen AI 9 HX PRO 370 uses the Strix Point codename and belongs to the Ryzen AI PRO 300 generation, which employs a hybrid configuration of Zen 5 and Zen 5c cores. It packs 12 cores and 24 threads into a 233 mm² die, with a base clock of 2.00 GHz and boost clock of 5.10 GHz. The EPYC 4345P, codenamed Grado, is part of the EPYC 4005 series and uses a pure Zen 5 design with 8 cores and 16 threads on a much smaller 70.6 mm² die. Its transistor count is listed at 8,315 million, while the Ryzen AI's transistor count is not recorded in the database.

The socket and platform targets could not be more different. The Ryzen AI 9 HX PRO 370 is a mobile processor on AMD Socket FP8 with a 28 TDP, designed for laptops and portable workstations. The EPYC 4345P is a server and workstation part on AMD Socket AM5 with a 65 TDP, aimed at single-socket servers and professional desktops. Both sockets are active production platforms, and neither processor has an unlocked multiplier.

Memory support shows both similarities and differences. Both chips use a dual-channel memory bus with 89.6 GB/s bandwidth and support ECC memory. The Ryzen AI supports both DDR5 and LPDDR5X, making it flexible for mobile designs, while the EPYC supports DDR5 only. The PCIe implementation differs substantially: the EPYC offers Gen 5 with 24 lanes, while the Ryzen AI provides Gen 4 with 16 lanes. This makes the EPYC better suited for high-bandwidth peripherals and multi-GPU configurations.

Integrated graphics also set the two apart. The Ryzen AI 9 HX PRO 370 features the Radeon 890M, a relatively powerful integrated GPU for a mobile chip. The EPYC 4345P includes a more basic Radeon Graphics solution, sufficient for display output but not designed for demanding graphical workloads. The release dates differ as well, with the Ryzen AI launching on January 5, 2025, and the EPYC following on May 12, 2025. The EPYC carries a launch MSRP of $329, while no launch MSRP is recorded for the Ryzen AI part.