AMD EPYC 7402

The AMD EPYC 7402 is a 24-core, 48-thread Zen 2 processor built for the server and workstation segment. With a 71st percentile ranking among all CPUs and an average benchmark score of 11,312, it sits in a performance tier where it trades blows with other high-core-count server parts. It is not a consumer desktop chip; its entire design philosophy centers on sustained throughput, large memory bandwidth, and dense compute for professional workloads.

Who Should Consider It

The EPYC 7402 targets workloads that scale with core count and memory bandwidth, not those that depend on a few fast threads. The data points to three primary use cases.

First, multi-threaded content creation and rendering. The Cinebench R23 multi-core score of 39,110 is the strongest result in the benchmark set, indicating that 3D rendering, video encoding, and batch image processing will see near-linear scaling across the 24 cores. For a workstation handling overnight renders or 4K video exports, this chip will complete tasks in a fraction of the time a lower-core-count part would require. The R20 multi-core score of 16,426 reinforces this; it places the chip firmly in the "heavy multi-thread" class.

Second, virtualization and database workloads. With 48 threads and eight-channel DDR4 memory, this processor can host multiple concurrent virtual machines or handle large in-memory databases. The 204.8 GB/s memory bandwidth is critical here; database queries and VM scheduling benefit directly from fast memory access across all cores simultaneously. The Zen 2 architecture with 128 MB of total L3 cache also helps keep frequently accessed data close to the cores, reducing latency in transactional workloads.

Third, scientific computing and financial simulations. The combination of 24 cores, 48 threads, and ECC memory support makes this a viable choice for compute nodes running MATLAB, Monte Carlo simulations, or computational fluid dynamics. The 180W TDP class implies that this is a sustained-load processor, not a burst-performance part. It will maintain high throughput over hours of operation, which is exactly what these workloads demand.

Gamers and general office users should look elsewhere. The R23 single-core score of 5,521 is mediocre by modern standards, and the chip's server-focused design means no integrated graphics and a platform that requires dedicated server motherboards. For pure office productivity (spreadsheets, email, web browsing), a consumer chip with higher single-thread performance would provide a snappier experience at a fraction of the power draw.

Power and Thermals

The EPYC 7402 carries a 180W TDP. This is a high-power part that demands a robust cooling solution. It is not a chip for a compact air cooler or a small-form-factor build. The thermal design implies a tower-style air cooler with at least two heat pipes, or a liquid cooler with a 240mm or larger radiator, assuming the server chassis supports such hardware. In a typical 1U or 2U server chassis, this TDP class requires high-static-pressure fans and careful airflow management to keep the CPU below thermal throttling thresholds during sustained all-core loads.

The 7nm TSMC process node helps mitigate heat density, but 180W is still 180W. It will raise the ambient temperature in any room where it operates. For workstation builds, a case with good front-to-back airflow is non-negotiable. The die size of 4x 74 mm² (four chiplets) means heat is spread across multiple physical dies, which is actually beneficial for cooling, it avoids the hot-spot problem of a single large die. However, the 15,200 million transistor count across those dies still generates significant total heat.

Single-Thread vs Multi-Thread Behavior

The benchmark data shows a stark contrast between single-thread and multi-thread performance. The R23 multi-core score of 39,110 is roughly 7.1 times the single-core score of 5,521. That ratio is typical of a high-core-count server chip. The R20 results (16,426 multi vs 2,318 single) show a ratio of about 7.1 as well, confirming consistency across benchmark versions. The R15 scores (3,942 multi vs 556 single) show a ratio of about 7.1 too, solidifying the pattern.

What this means in practice is that the EPYC 7402 excels when all cores are active, but it will not deliver impressive responsiveness in single-threaded applications. Legacy software, certain scripting languages, and some CAD tools that rely on a single primary thread will run at roughly the same speed as a mid-range consumer desktop CPU. The boost clock of 3.35 GHz is not low, but it is not high enough to compete with dedicated high-frequency parts. For workloads that alternate between single-threaded and multi-threaded phases, expect the multi-threaded phases to dominate total runtime, making the chip still worthwhile overall.

The base clock of 2.80 GHz is the sustained all-core frequency. Under a full 24-core load, the processor will hold near this speed indefinitely, which is more important than the boost clock for server workloads. The boost clock is for short bursts, such as compiling a small module or handling a single database query.

FAQ

Q: Does the EPYC 7402 support ECC memory?

A: Yes, ECC memory is supported, which is essential for error-free long-running computations in servers and workstations.

Q: What is the memory configuration?

A: It supports DDR4 memory over an eight-channel bus, with a total memory bandwidth of 204.8 GB/s. This is a high-bandwidth configuration suited for memory-intensive workloads.

Q: How many PCIe lanes does it provide?

A: The CPU provides 128 PCIe Gen 4 lanes. This allows for multiple high-speed GPUs, NVMe storage devices, and network cards without needing a separate PCIe switch.

Q: Does it have integrated graphics?

A: No, there is no integrated graphics. A dedicated GPU is required for display output, even for basic server administration.

Q: What socket does it use?

A: It uses AMD Socket SP3, which is the server platform socket for the EPYC 7002 series. This socket is not compatible with consumer AM4 or AM5 motherboards.

Q: What is the production status?

A: The production status is listed as Active, meaning it is still a current product available for purchase, despite the release date of 2019-08-06.

How It Compares

The EPYC 7402's average benchmark score of 11,312 places it in a tight cluster with four other processors. The closest rival is the AMD EPYC 73F3, which scores 11,334, a delta of -0.2%. That means the EPYC 73F3 is essentially tied with the 7402, with a negligible 0.2% advantage. In real-world terms, these two chips are interchangeable in performance, and the choice would come down to platform features or price, not speed.

Next is the AMD EPYC 7452, scoring 11,279, a delta of +0.3% in favor of the 7402. Again, this is a statistical tie. The 0.3% difference is well within run-to-run variance for any benchmark. Users upgrading from a 7452 would see no measurable gain from the 7402.

The Intel Core i3-1305U scores 11,225, a delta of +0.8% for the 7402. This is a surprising comparison because the Core i3-1305U is a low-power mobile processor, not a server chip. The fact that it scores nearly identically to the EPYC 7402 on average benchmark score highlights that the EPYC's strength is in scaling, not in per-thread speed. The i3-1305U likely wins on single-thread and loses massively on multi-thread, but the average score masks that divergence.

Finally, the Intel Xeon Gold 6336Y scores 11,191, a delta of +1.1% for the 7402. The 7402 holds a slight edge over this Xeon, but again, the margin is small. In a server fleet, this 1.1% difference would translate to a few seconds of runtime per hour, which is unlikely to be decisive.

Platform and Compatibility

The EPYC 7402 uses AMD Socket SP3, a server-grade socket that is exclusive to the EPYC product line. It is not compatible with any consumer motherboard. The chipset and platform are designed for rack servers, tower workstations, and blade systems. The platform supports DDR4 memory across eight channels, requiring registered DIMMs (RDIMMs) or LRDIMMs, not standard desktop memory.

PCIe support is Gen 4 with 128 lanes from the CPU. This is a major advantage for systems that need multiple high-bandwidth devices. You can populate four or more Gen 4 NVMe SSDs, multiple GPUs, and high-speed network cards without lane contention. Gen 4 also doubles the bandwidth per lane compared to Gen 3, which future-proofs the system for upcoming storage and accelerator hardware.

The memory bandwidth of 204.8 GB/s is achieved only when all eight channels are populated. Using fewer DIMMs will reduce bandwidth, so for optimal performance, populate all eight channels with at least one DIMM each. The 128 MB total L3 cache (32 MB per die) is shared across the four chiplets, providing a large cache pool for data reuse in multi-threaded applications.

Upgrade path within the EPYC 7002 series is straightforward: any other SP3 socket processor from the same generation will drop into the same motherboard, assuming BIOS support. This allows for a future core-count increase without a full platform change. However, moving to a different generation (e.g., EPYC 7003) would require a new motherboard, as the socket and platform are not forward-compatible. The production status is Active, so this chip is still available for new builds or upgrades to existing SP3 systems.