AMD EPYC 4124P vs AMD Ryzen 7 8840U Comparison

Head-to-Head Benchmarks

The benchmark data shows a clear split between these two AMD processors, with the Ryzen 7 8840U taking 10 of the 15 recorded head-to-head tests, while the EPYC 4124P wins 5. The Ryzen 7 8840U’s victories are often decisive, while the EPYC 4124P’s wins are more concentrated in specific workloads.

The largest margin for the Ryzen 7 8840U comes in PassMark integer math, where it scores 85,740 against the EPYC 4124P’s 52,855, a 62.2% advantage. Floating-point math also favors the mobile chip heavily, with 48,820 versus 31,518, a 54.9% lead. Data encryption shows a 38.2% gap (16,072 vs 11,630), and random string sorting is 32.6% ahead (32,158 vs 24,259). These are substantial margins that point to the Ryzen 7 8840U’s strength in compute-heavy, parallel tasks that exercise the full core count.

The Ryzen 7 8840U also wins the Cinebench R15 tests, both multi-core and single-core. In R15 multi-core, it scores 2,024 versus 1,538, a 31.6% improvement. The single-core R15 result shows a 23.1% lead (266 vs 216). The PassMark multithread test shows a 28.7% edge (23,346 vs 18,139), and data compression is 30.5% higher (267,525 vs 204,926). Even the physics test, which is often a differentiator, favors the Ryzen 7 8840U by 8.2% (1,176 vs 1,087).

The EPYC 4124P’s wins tell a different story. In Cinebench R23, the server chip pulls ahead significantly: multi-core score of 15,264 versus 12,972, a 15% advantage, and single-core of 2,154 versus 1,703, a 20.9% lead. The PassMark single-thread test also goes to the EPYC 4124P, with 3,897 versus 3,543, a 9.1% margin. The only other EPYC win is in the find prime numbers test, where it scores 89 versus 78, a 12.4% edge.

What is striking is that the EPYC 4124P wins in Cinebench R23, a modern and demanding render workload, despite having half the cores. This suggests that its higher base clock and larger L3 cache contribute to efficiency that the Ryzen 7 8840U cannot match in that specific test, despite the latter’s 8-core/16-thread configuration. The overall average benchmark score shows the Ryzen 7 8840U at 23,982 versus the EPYC 4124P’s 23,167, a 3.5% difference in favor of the mobile part.

Architecture Differences

Both processors are built on the Zen 4 architecture, but they are implemented on different process nodes and have different physical characteristics. The Ryzen 7 8840U uses a 4 nm process from TSMC, while the EPYC 4124P uses a 5 nm process. This node difference explains part of the performance and efficiency gap.

The Ryzen 7 8840U has 8 cores and 16 threads, double the EPYC 4124P’s 4 cores and 8 threads. The mobile chip’s die size is 178 mm² with 25,000 million transistors, while the EPYC 4124P’s die is much smaller at 71 mm² with 6,570 million transistors. The larger, denser chip on a smaller node allows the Ryzen 7 8840U to pack more compute resources.

Cache configuration also differs. Both have 64 KB of L1 per core and 1 MB of L2 per core, but the L3 cache is different: the Ryzen 7 8840U has 16 MB shared, while the EPYC 4124P has 32 MB shared. This doubled L3 cache likely contributes to the EPYC 4124P’s strong single-thread performance in Cinebench R23 and PassMark, as more data can reside closer to the cores.

Memory support shows both use DDR5 with dual-channel buses, but the Ryzen 7 8840U has a higher theoretical bandwidth at 89.6 GB/s versus 83.2 GB/s for the EPYC 4124P. The EPYC 4124P supports ECC memory, while the Ryzen 7 8840U does not. PCIe connectivity is another key divider: the Ryzen 7 8840U offers Gen 4 with 20 lanes, while the EPYC 4124P provides Gen 5 with 28 lanes, making the server chip more capable for expansion and high-speed peripherals.

The sockets are entirely different. The Ryzen 7 8840U uses AMD Socket FP8, a mobile platform, while the EPYC 4124P uses AMD Socket AM5, a desktop/server platform. The TDP reflects this: the Ryzen 7 8840U is rated at 28 watts, while the EPYC 4124P is rated at 65 watts. This power envelope difference explains why the mobile chip can sustain high multi-threaded throughput despite lower clocks. Base clocks are 3.30 GHz for the Ryzen 7 8840U and 3.80 GHz for the EPYC 4124P, but both boost to 5.10 GHz.

The integrated graphics also differ: the Ryzen 7 8840U features Radeon 780M, while the EPYC 4124P has a more generic Radeon Graphics solution. This makes the mobile part more suited to visual tasks without a discrete GPU.

Where Each One Wins

The Ryzen 7 8840U is the clear winner for multi-threaded, parallel workloads that use all available cores. Its 8-core, 16-thread configuration delivers decisive leads in integer math, floating-point math, encryption, and data compression. These are the kinds of tasks found in content creation, scientific computing, and general productivity. The 62.2% integer math advantage and 54.9% floating-point lead show that the extra cores are not just a marketing claim; they translate into real performance for compute-heavy applications.

The EPYC 4124P wins where single-thread performance and cache efficiency matter most. Its Cinebench R23 single-core score is 20.9% higher, and its multi-core R23 score is 15% higher despite having half the cores. This suggests that for workloads that are latency-sensitive or that scale poorly across many cores, the EPYC 4124P will feel faster. The 32 MB L3 cache is likely the key factor, as it reduces memory stalls. The find prime numbers test, which is a classic single-threaded integer workload, also goes to the EPYC 4124P.

For mixed use, the Ryzen 7 8840U wins the PassMark multithread test by 28.7%, indicating that its thread scaling is superior in that aggregate measure. The physics test, which often reflects real-world simulation, also favors the mobile chip by 8.2%. This makes the Ryzen 7 8840U the better choice for anyone who needs a balance of multi-core throughput and acceptable single-core performance, which is the typical profile for a laptop or compact desktop.

The EPYC 4124P is the better choice for server environments where ECC memory is required and where single-threaded response times are critical. Its higher base clock and larger cache give it an edge in transactional workloads and database queries that cannot leverage many cores. The Gen 5 PCIe lanes also make it more suitable for high-speed storage or networking, even though the CPU itself is smaller.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 7 8840U has 8 cores and 16 threads, while the AMD EPYC 4124P has 4 cores and 8 threads.

Q: Why does the EPYC 4124P win in Cinebench R23 despite having fewer cores?

A: The EPYC 4124P has a higher base clock of 3.80 GHz versus 3.30 GHz, and it has 32 MB of shared L3 cache versus 16 MB on the Ryzen 7 8840U. These factors contribute to its 15% multi-core and 20.9% single-core lead in that test.

Q: Which processor supports ECC memory?

A: Only the AMD EPYC 4124P supports ECC memory. The Ryzen 7 8840U does not.

Q: What are the memory bandwidth figures for each?

A: The Ryzen 7 8840U has a memory bandwidth of 89.6 GB/s, while the EPYC 4124P has 83.2 GB/s.

Q: How do the processors compare in terms of PCIe support?

A: The Ryzen 7 8840U supports PCIe Gen 4 with 20 lanes, while the EPYC 4124P supports PCIe Gen 5 with 28 lanes.

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

A: The EPYC 4124P scores 3,897 in PassMark single-thread, which is 9.1% higher than the Ryzen 7 8840U’s 3,543.

The Verdict

The data points to two distinct profiles. The AMD Ryzen 7 8840U is the superior processor for multi-threaded compute tasks. Its 10 benchmark wins include the largest margins in the comparison, with integer math and floating-point math showing leads of over 50%. It also wins in data compression, encryption, and the overall PassMark multithread test. Any user running parallel workloads, such as video rendering, scientific simulations, or software compilation, will see tangible benefits from the 8-core configuration.

The AMD EPYC 4124P is the better choice for single-threaded performance and server-specific features. It wins Cinebench R23 single-core by 20.9% and multi-core by 15%, despite having half the cores. Its PassMark single-thread score is also higher by 9.1%. For workloads that are latency-bound or that require ECC memory, the EPYC 4124P is the clear winner. Its higher base clock and doubled L3 cache make it more responsive in sequential tasks.

The average benchmark scores are close, with the Ryzen 7 8840U at 23,982 and the EPYC 4124P at 23,167, a 3.5% gap. This indicates that for general mixed usage, the mobile chip holds a slight overall edge. The Ryzen 7 8840U also has a lower TDP of 28 watts versus 65 watts, making it far more efficient for sustained workloads in a portable form factor.

The decision comes down to the environment. For a mobile workstation or compact desktop where multi-threaded throughput and efficiency are priorities, the Ryzen 7 8840U is the data-driven choice. For a server or workstation where ECC memory, single-thread speed, and PCIe Gen 5 connectivity are required, the EPYC 4124P is the correct pick. Its launch MSRP is $149, which is the only pricing information available in the database.

Specification Differences

The two processors differ in several key specifications:

• Cores: Ryzen 7 8840U has 8 cores, EPYC 4124P has 4 cores.
• Threads: Ryzen 7 8840U has 16 threads, EPYC 4124P has 8 threads.
• Base Clock: Ryzen 7 8840U runs at 3.30 GHz, EPYC 4124P at 3.80 GHz.
• Boost Clock: Both reach 5.10 GHz.
• TDP: Ryzen 7 8840U is rated at 28 watts, EPYC 4124P at 65 watts.
• Socket: Ryzen 7 8840U uses AMD Socket FP8, EPYC 4124P uses AMD Socket AM5.
• Process Node: Ryzen 7 8840U is on 4 nm, EPYC 4124P is on 5 nm.
• Transistors: Ryzen 7 8840U has 25,000 million, EPYC 4124P has 6,570 million.
• Die Size: Ryzen 7 8840U is 178 mm², EPYC 4124P is 71 mm².
• L3 Cache: Ryzen 7 8840U has 16 MB shared, EPYC 4124P has 32 MB shared.
• Memory Bandwidth: Ryzen 7 8840U has 89.6 GB/s, EPYC 4124P has 83.2 GB/s.
• ECC Memory: Ryzen 7 8840U does not support it, EPYC 4124P does.
• PCIe: Ryzen 7 8840U is Gen 4 with 20 lanes, EPYC 4124P is Gen 5 with 28 lanes.
• Integrated Graphics: Ryzen 7 8840U has Radeon 780M, EPYC 4124P has Radeon Graphics.
• Market Segment: Ryzen 7 8840U is Mobile, EPYC 4124P is Server/Workstation.
• Release Date: Ryzen 7 8840U launched on 2023-12-05, EPYC 4124P on 2024-05-20.
• Part Number: Ryzen 7 8840U has multiple variants (100-000001323, 100-000001375, 100-000001312), EPYC 4124P has 100-000001570.