AMD EPYC 7742 vs AMD Ryzen 3 8440U Comparison

The AMD Ryzen 3 8440U and AMD EPYC 7742 represent opposite ends of the processor spectrum, and benchmark data confirms they serve fundamentally different purposes. The EPYC 7742 wins all six head-to-head benchmark comparisons by a consistent margin of roughly 81.5% in each test, reflecting its massive core advantage. The Ryzen 3 8440U, however, is a mobile-focused chip with integrated graphics and a much lower power envelope, making it suitable for thin-and-light laptops. Neither processor is a substitute for the other; the data indicates the EPYC 7742 is for server workloads requiring massive parallel throughput, while the Ryzen 3 8440U targets portable computing with balanced single-thread performance and integrated graphics capability.

The Verdict

The benchmark data delivers a clear verdict: the AMD EPYC 7742 is the superior processor for any workload that can utilize more than a handful of threads. Its Cinebench R23 multicore score of 58,769 dwarfs the Ryzen 3 8440U’s 10,884, a gap of 81.5% that holds consistently across every Cinebench iteration. Even in single-core tests, the EPYC 7742 leads by 81.5% in R23 (8,296 vs 1,536), which is counterintuitive given the Ryzen 3's higher boost clock of 4.70 GHz versus 3.40 GHz — but the data shows the EPYC’s architecture delivers superior per-thread results in these benchmarks. For server workloads, data center applications, or any task involving heavy multi-threading, the EPYC 7742 is the only logical choice from this comparison.

The Ryzen 3 8440U, conversely, should be selected for mobile systems where power consumption and integrated graphics are priorities. Its 28W TDP versus the EPYC’s 225W makes it suitable for laptops, and the Radeon 740M integrated GPU eliminates the need for a discrete graphics card in basic systems. The Ryzen 3 also supports DDR5 memory, while the EPYC is limited to DDR4, giving the mobile chip a generational memory advantage. However, the Ryzen 3 has zero benchmark wins, so any performance-sensitive workload would require the EPYC 7742 — but that processor cannot be installed in a laptop, as it uses Socket SP3 and lacks integrated graphics.

Architecture Differences

The two processors come from different architectural generations, which explains many of their behavioral differences. The Ryzen 3 8440U uses Zen 4 architecture on a 4nm process node from TSMC, codenamed Hawk Point, and belongs to the 8000 series. The EPYC 7742 uses Zen 2 architecture on a 7nm process node, also from TSMC, codenamed Rome, and belongs to the EPYC 7002 series. The Ryzen 3 is built with 20,900 million transistors on a 137 mm² die, while the EPYC 7742 has 3,800 million transistors on a 74 mm² die — the Ryzen 3’s die is nearly double the size despite having far fewer cores, reflecting the newer process and integrated GPU.

Core and cache configurations differ dramatically. The Ryzen 3 8440U has 4 cores and 8 threads, while the EPYC 7742 has 64 cores and 128 threads. The Ryzen 3’s cache hierarchy includes 64 KB L1 per core, 1 MB L2 per core, and 8 MB shared L3. The EPYC 7742 has 96 KB L1 per core, 512 KB L2 per core, and a massive 256 MB shared L3 — 32 times the L3 cache of the Ryzen 3. The EPYC also supports ECC memory, which the Ryzen 3 does not, and uses an eight-channel memory bus compared to the Ryzen 3’s dual-channel. Memory bandwidth reflects this: the EPYC 7742 delivers 204.8 GB/s versus 89.6 GB/s for the Ryzen 3. The Ryzen 3 supports PCIe Gen 4 with 14 lanes (CPU only), while the EPYC 7742 supports PCIe Gen 4 without lane count specified in the data.

Head-to-Head Benchmarks

The head-to-head results are uniformly one-sided, with the EPYC 7742 winning all six comparisons by nearly identical margins. In Cinebench R15, the EPYC scores 5,923 multicore versus 1,097 for the Ryzen 3, a delta of -81.5%. Single-core R15 shows the EPYC at 836 versus 154, also -81.5%. Cinebench R20 multicore sees the EPYC at 24,682 versus 4,571, again -81.5%, and single-core R20 is 3,484 versus 645, -81.5%. Cinebench R23 multicore follows the pattern: 58,769 for the EPYC and 10,884 for the Ryzen 3, -81.5%. Single-core R23 is 8,296 versus 1,536, -81.5%.

The consistency of the -81.5% delta across all tests is remarkable. It suggests the performance gap is structural rather than workload-dependent, driven by the EPYC’s 16x core count advantage and larger cache. The Ryzen 3’s higher boost clock of 4.70 GHz does not overcome the EPYC’s architectural advantages in these specific benchmarks. The Ryzen 3 has additional benchmark scores not present for the EPYC, including PassMark tests: data compression at 146,273, data encryption at 8,012, extended instructions at 11,059, find prime numbers at 43, floating point math at 23,017, integer math at 37,468, multithread at 12,805, physics at 685, random string sorting at 17,725, and single thread at 3,648. These scores cannot be compared head-to-head because the EPYC lacks corresponding data.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 7742 has 64 cores and 128 threads, while the AMD Ryzen 3 8440U has 4 cores and 8 threads.

Q: What are the power consumption differences?

A: The Ryzen 3 8440U has a TDP of 28W, while the EPYC 7742 has a TDP of 225W.

Q: Do these processors support ECC memory?

A: The EPYC 7742 supports ECC memory, while the Ryzen 3 8440U does not.

Q: Which processor has integrated graphics?

A: The Ryzen 3 8440U includes Radeon 740M integrated graphics, while the EPYC 7742 has no integrated graphics.

Q: What memory types do they support?

A: The Ryzen 3 8440U supports DDR5 memory with dual-channel configuration, while the EPYC 7742 supports DDR4 memory with eight-channel configuration.

Q: How do their average benchmark scores compare?

A: The Ryzen 3 8440U has an average benchmark score of 16,663, while the EPYC 7742 has an average benchmark score of 16,998.

Where Each One Wins

The EPYC 7742 wins every benchmark where both processors have data, which includes all Cinebench R15, R20, and R23 tests, both multicore and single-core. Its dominance in multicore workloads is expected given its 64 cores versus 4 cores, but its single-core wins are notable given the Ryzen 3’s higher boost clock. The EPYC’s 256 MB L3 cache and 204.8 GB/s memory bandwidth support server-style workloads such as large-scale virtualization, database processing, and scientific computing that require massive parallel throughput. Its eight-channel memory bus and ECC support make it suitable for data integrity-sensitive applications.

The Ryzen 3 8440U wins in the mobile segment by virtue of its form factor, power efficiency, and integrated graphics. Its 28W TDP allows for passive or low-noise cooling in laptops, and the Radeon 740M integrated GPU handles display output without a discrete graphics card. It supports DDR5 memory, offering higher bandwidth per channel than the EPYC’s DDR4, and its 4.70 GHz boost clock provides responsive single-thread performance for everyday applications. The Ryzen 3 also has a smaller physical footprint with its FP7 socket, compared to the EPYC’s SP3 socket, making it the only choice for portable systems.

Specification Differences

The two processors differ across nearly every specification field. The Ryzen 3 8440U has 4 cores and 8 threads, while the EPYC 7742 has 64 cores and 128 threads. Base clocks are 3.00 GHz for the Ryzen 3 and 2.25 GHz for the EPYC, with boost clocks of 4.70 GHz and 3.40 GHz respectively. TDP differs substantially: 28W for the Ryzen 3 versus 225W for the EPYC. The Ryzen 3 uses AMD Socket FP7, while the EPYC uses AMD Socket SP3. Architecture is Zen 4 for the Ryzen 3 and Zen 2 for the EPYC, with codenames Hawk Point and Rome respectively.

Process nodes differ at 4nm for the Ryzen 3 versus 7nm for the EPYC, both from TSMC. Transistor counts are 20,900 million for the Ryzen 3 and 3,800 million for the EPYC. Die sizes are 137 mm² and 74 mm² respectively. Cache configurations differ: the Ryzen 3 has 64 KB L1 per core and 1 MB L2 per core, while the EPYC has 96 KB L1 per core and 512 KB L2 per core. L3 cache is 8 MB shared for the Ryzen 3 and 256 MB shared for the EPYC. Memory support is DDR5 for the Ryzen 3 and DDR4 for the EPYC, with dual-channel versus eight-channel buses. Memory bandwidth is 89.6 GB/s versus 204.8 GB/s. ECC memory is false for the Ryzen 3 and true for the EPYC. The Ryzen 3 has integrated Radeon 740M graphics, while the EPYC has none. The market segments are Mobile versus Server/Workstation. Release dates are 2023-12-05 for the Ryzen 3 and 2019-08-06 for the EPYC. Neither processor has an unlocked multiplier.