AMD EPYC 4364P vs AMD Ryzen 9 7845HX Comparison

Head-to-Head Benchmarks

The head-to-head data reveals a surprisingly lopsided contest, with the AMD Ryzen 9 7845HX claiming 12 of the 15 recorded benchmark wins. The most dramatic margin comes in the PassMark find prime numbers test, where the Ryzen 9 7845HX scores 329 against the EPYC 4364P's 177, a 85.9% advantage. This is a workload that heavily rewards the Ryzen 9's 12 cores and 24 threads over the EPYC's 8 cores and 16 threads.

The Ryzen 9 7845HX also dominates in integer math, scoring 155118 versus 107775, a 43.9% lead. Floating point math shows a similar story with a 40.8% advantage (94287 vs 66946). Data compression and encryption workloads follow the same pattern, with the Ryzen 9 winning by 33.1% and 35.6% respectively. The multi-threaded PassMark score confirms this trend, with the Ryzen 9 at 45010 outpacing the EPYC's 33883 by 32.8%.

However, the EPYC 4364P takes three notable victories, and they are significant. In Cinebench R23 single-core, the EPYC scores 4177 against the Ryzen 9's 1852, a massive 55.7% lead. This is the largest single benchmark gap in either direction. The EPYC also wins Cinebench R23 multi-core with 29589 versus 26876, a 9.2% margin, despite having fewer cores. In Cinebench R15 single-core, the EPYC leads 420 to 295, a 29.8% advantage.

Interestingly, the Cinebench R15 multi-core test goes the other way, with the Ryzen 9 winning 4320 to 2982, a 44.9% lead. This stark contrast between the two Cinebench versions suggests the EPYC's higher clock speeds matter more in certain rendering workloads. The Ryzen 9's single-thread PassMark score of 3935 does beat the EPYC's 3619, but by only 8.7%, a much smaller margin than the Cinebench single-core tests would suggest.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD EPYC 4364P boosts to 5.40 GHz, while the AMD Ryzen 9 7845HX reaches 5.20 GHz. The EPYC also has a much higher base clock at 4.50 GHz compared to the Ryzen 9's 3.00 GHz.

Q: How do the core and thread counts compare?

A: The Ryzen 9 7845HX has 12 cores and 24 threads, while the EPYC 4364P has 8 cores and 16 threads. This gives the Ryzen 9 a 50% advantage in core count and thread count.

Q: What is the TDP difference between the two?

A: The Ryzen 9 7845HX has a TDP of 55 watts, while the EPYC 4364P has a TDP of 105 watts. The EPYC consumes nearly double the power budget, which aligns with its higher clock speeds.

Q: Do both processors support ECC memory?

A: Yes, both the Ryzen 9 7845HX and the EPYC 4364P support ECC memory, and both use dual-channel DDR5 with a memory bandwidth of 83.2 GB/s.

Q: Which processor has a larger L3 cache?

A: The Ryzen 9 7845HX has 64 MB of shared L3 cache, while the EPYC 4364P has 32 MB of shared L3 cache. The Ryzen 9's L3 cache is double the size.

Q: What are the socket requirements for each?

A: The Ryzen 9 7845HX uses AMD Socket FL1, while the EPYC 4364P uses AMD Socket AM5. Both are physically incompatible with each other's platforms.

Where Each One Wins

The Ryzen 9 7845HX is the clear winner for massively parallel, throughput-oriented workloads. Its 12-core, 24-thread configuration delivers decisive advantages in integer math (43.9% lead), floating point math (40.8% lead), and data compression (33.1% lead). The PassMark multithread score of 45010 versus 33883 shows that any application that scales across many threads will favor the Ryzen 9. The extended instructions test, which measures SIMD and vector processing capabilities, also goes to the Ryzen 9 by 29.8%, making it the better choice for scientific computing and media encoding tasks that use these instruction sets.

The EPYC 4364P wins in scenarios where raw clock speed trumps core count. Its 5.40 GHz boost clock and 4.50 GHz base clock allow it to dominate in Cinebench R23 single-core by 55.7%, which is a strong indicator for lightly-threaded rendering, legacy software, and applications that cannot utilize more than a few cores. The EPYC also manages to win Cinebench R23 multi-core by 9.2%, suggesting that its higher per-core performance can overcome the Ryzen 9's core-count advantage in certain rendering workloads. This makes the EPYC a better fit for single-threaded server tasks like database query processing or web serving where latency on individual requests is critical.

For mixed workloads, the PassMark single-thread test shows the Ryzen 9 winning by 8.7%, but this is a much smaller margin than the EPYC's Cinebench single-core wins. The practical takeaway is that the Ryzen 9 provides a more balanced profile, while the EPYC is specialized for peak single-core performance.

Specification Differences

The two processors differ in core count, clock speeds, TDP, socket, cache size, integrated graphics, and market segment. The Ryzen 9 7845HX has 12 cores and 24 threads, while the EPYC 4364P has 8 cores and 16 threads. Base clocks are 3.00 GHz for the Ryzen 9 and 4.50 GHz for the EPYC, with boost clocks of 5.20 GHz and 5.40 GHz respectively. The TDP is 55 watts for the Ryzen 9 and 105 watts for the EPYC.

The Ryzen 9 uses AMD Socket FL1, while the EPYC uses AMD Socket AM5. L3 cache is 64 MB on the Ryzen 9 versus 32 MB on the EPYC. The integrated graphics are Radeon 610M on the Ryzen 9 and Radeon Graphics on the EPYC. The market segments are Mobile for the Ryzen 9 and Server/Workstation for the EPYC. The Ryzen 9 has an unlocked multiplier, while the EPYC does not. Both support DDR5 dual-channel memory with 83.2 GB/s bandwidth, ECC memory, and PCIe Gen 5 with 28 lanes (CPU only).

Architecture Differences

Both processors are built on AMD's Zen 4 architecture using a 5 nm process from TSMC, but the similarities end there. The Ryzen 9 7845HX comes from the Dragon Range codename, designed for high-performance mobile laptops. It uses a chiplet design with two 71 mm² dies, totaling 13,140 million transistors. The EPYC 4364P uses the Raphael codename, which is a single 71 mm² die with 6,570 million transistors. This explains the transistor count difference: the Ryzen 9 has two dies, each holding the same transistor count as the EPYC's single die.

The Ryzen 9's 64 MB L3 cache is double the EPYC's 32 MB, which is a direct result of the two-die configuration. The EPYC's higher clock speeds (4.50 GHz base, 5.40 GHz boost) are achievable because of its single-die design, which generates less heat across a smaller area and allows for higher frequency operation within its 105 watt TDP. The Ryzen 9's dual-die design requires more power management, and its 55 watt TDP is a mobile-oriented constraint.

The release dates differ substantially: the Ryzen 9 was released on 2023-01-03, while the EPYC arrived on 2024-05-20. The EPYC's later release date likely allowed for more aggressive clock tuning. The EPYC's launch MSRP is $399, which is a notable data point for its positioning as a server processor.

The Verdict

The benchmark data paints a clear picture for different use cases. The AMD Ryzen 9 7845HX is the superior choice for multi-threaded, compute-heavy workloads. Its 12 cores and 24 threads deliver decisive wins in integer math, floating point math, data compression, encryption, and the overall PassMark multithread score. The 85.9% lead in find prime numbers and the 43.9% lead in integer math are particularly strong indicators for scientific simulation, financial modeling, and video encoding. The Ryzen 9's 64 MB L3 cache and dual-die design provide ample bandwidth for data-intensive tasks.

The AMD EPYC 4364P is the choice for workloads where single-thread performance is paramount. Its 55.7% lead in Cinebench R23 single-core is the largest benchmark gap recorded in this comparison. The EPYC's 4.50 GHz base clock and 5.40 GHz boost clock make it ideal for latency-sensitive server applications, database transactions, and any software that cannot parallelize across many cores. The fact that it also wins Cinebench R23 multi-core by 9.2%, despite having fewer cores, indicates that the EPYC's per-core performance can compensate for its core-count deficit in certain rendering scenarios.

For a mobile user needing maximum throughput in a 55 watt envelope, the Ryzen 9 7845HX is the data-backed winner. For a server administrator prioritizing single-core response times and who can accommodate a 105 watt TDP, the EPYC 4364P is the better fit. Both processors sit at the 89th percentile versus all CPUs, but their strengths are distinct. The Ryzen 9's average benchmark score of 46654 versus the EPYC's 45970 reflects its broader multi-threaded dominance, while the EPYC's wins in Cinebench show where raw clock speed matters most. The choice ultimately depends on whether the workload scales with cores or with frequency.