AMD EPYC 7443

The AMD EPYC 7443 is a 24-core, 48-thread server processor built on the Zen 3 Milan architecture and manufactured at TSMC's 7 nm process. It operates at a 2.85 GHz base clock with a 4.00 GHz boost clock inside a 200 W TDP, and it targets the server and workstation segment with DDR4 memory support, ECC capability, and PCIe Gen 4 connectivity. Its aggregate benchmark average of 13936 places it at the 73rd percentile among all CPUs in the database, a position that becomes more interesting when the processor is compared against mainstream desktop and mobile parts with similar average scores. Its launch MSRP was $2010.

Platform and Compatibility

The EPYC 7443 uses the AMD Socket SP3 platform, the same socket that hosts the EPYC 7003 series. The chip is built from four 81 mm² dies containing a total of 16,600 million transistors, with a 128 MB shared L3 cache. Each core receives 64 KB of L1 cache and 512 KB of L2 cache. That cache configuration is designed to feed heavily threaded workloads, and the large shared L3 pool is a distinguishing feature of the Milan generation.

Memory support is DDR4 across an eight-channel bus, delivering 204.8 GB/s of memory bandwidth. The memory controller natively supports ECC memory, which is a requirement for many server and workstation reliability scenarios. For I/O, the processor exposes 128 PCIe Gen 4 lanes from the CPU itself, which provides substantial headroom for storage arrays, high-speed networking, and accelerator cards without requiring an external switch. The combination of eight-channel memory, ECC, and a high lane count positions the EPYC 7443 for dense computation and virtualization hosts where memory bandwidth and I/O capacity matter as much as core count.

The processor is listed as active in production, and its release date is 2021-03-14. The multiplier is not unlocked, so overclocking is not a design consideration on this platform; performance tuning is expected to occur through platform power management and workload configuration rather than per-core multiplier adjustment. As a Socket SP3 part, it belongs to the broader EPYC 7003 family, which means platform compatibility is defined by that socket and the associated memory and I/O architecture.

Who Should Consider It

The benchmark profile of the EPYC 7443 is heavily weighted toward multi-threaded execution, which makes it a strong candidate for rendering, simulation, code compilation, and other workloads that can utilize 48 threads. In Cinebench R23, the chip scores 48183 in the multi-core test, while the R20 multi-core score is 20236 and the R15 multi-core score is 4856. These numbers indicate that the processor scales effectively across its 24 cores, and the 128 MB shared L3 cache provides a large working set for data-intensive tasks.

For workloads that are not fully parallel, the single-core performance remains respectable for a server part. The Cinebench R23 single-core score of 6802 and the R20 single-core score of 2856 indicate that the chip does not sacrifice per-thread responsiveness entirely in favor of core count. This makes it suitable for mixed workloads where a single-threaded front-end process coordinates parallel workers, such as some scientific computing pipelines and database operations.

That said, the EPYC 7443 is not positioned for client gaming or lightweight consumer use cases. Its market segment is explicitly server and workstation, and the platform's memory, PCIe lane count, and ECC support point toward data center racks rather than desktop machines. Workloads that benefit most are those that can fill eight memory channels and keep 48 threads busy for sustained periods. For users with a mix of heavily threaded batch jobs and moderate single-threaded interaction, the processor offers a balanced profile, but the entire platform investment is justified primarily by multi-thread throughput.

Single-Thread vs Multi-Thread Behavior

The contrast between the single-core and multi-core Cinebench results reveals the design intent of the EPYC 7443. In Cinebench R23, the multi-core score of 48183 is achieved with 48 threads, while the single-core score of 6802 represents the output of a single thread. The gap between these scores is typical of a high-core-count server processor where scalability is emphasized over raw per-core frequency. The boost clock of 4.00 GHz is modest by modern desktop standards, but the architecture compensates with a large shared cache and high memory bandwidth.

In Cinebench R20, the pattern holds: 20236 multi-core versus 2856 single-core. In R15, the multi-core score is 4856 and the single-core score is 685. The consistent ratio across three generations of the Cinebench test shows that the processor's performance scaling is stable under increasing thread counts. The single-core scores, while not extreme, are sufficient for administrative tasks, light interactive use, and the portions of a workload that cannot be parallelized. The multi-core scores are the headline figures, and they indicate that the processor's value lies in throughput rather than per-thread latency.

This split has practical consequences. A workload that can use a few threads will perform adequately, but a workload that can use dozens of threads will extract the full benefit of the 24-core, 48-thread configuration. The 128 MB shared L3 cache also helps with workloads that repeatedly access a large shared dataset, since it reduces the need to go to memory. The eight-channel memory subsystem further supports multi-threaded scaling by providing sufficient bandwidth to keep all cores fed simultaneously.

How It Compares

The nearest rivals in the benchmark database are determined by average score, and the EPYC 7443 sits within a tight cluster of very different processors. Against the Intel Core i5-8400, the EPYC 7443 is 0.3% ahead in average score. The i5-8400 is a desktop part with far fewer threads, so the aggregate similarity is more a reflection of the average benchmark methodology than of direct applicability; the two chips would serve very different workloads.

Against the Intel Core i7-8750H, the EPYC 7443 is 0.6% ahead in average score. The i7-8750H is a mobile processor, and its presence in the nearest rivals reinforces the point that aggregate scores can cluster across unrelated product classes. The EPYC 7443's advantages in memory bandwidth, ECC support, and PCIe lane count do not show up in a single aggregate figure, but those platform features matter for server deployments.

Against the AMD Ryzen 5 5500U, the EPYC 7443 is 1.2% ahead in average score. The Ryzen 5 5500U is a low-power mobile chip, so the 1.2% gap in aggregate benchmarks is far smaller than the difference in platform capabilities. For a server operating at a 200 W TDP, this comparison illustrates that aggregate scores are a limited lens for evaluating a processor that is built for sustained multi-threaded and professional workloads.

Against the AMD EPYC 7552, the EPYC 7443 is 1.3% behind in average score. The EPYC 7552 is also a server processor, and the 1.3% gap means that within the same class, the EPYC 7443 is effectively a peer in aggregate benchmark performance, despite whatever architectural differences exist between the two parts.

Benchmark Performance

The EPYC 7443's average benchmark score is 13936, placing it above 73% of all CPUs in the database. That percentile is notable for a 24-core server part, because the database includes many consumer processors with high single-thread performance. The aggregate score shows that the EPYC 7443 holds its own in mixed benchmarks, although its primary strength is apparent in the multi-core tests.

In Cinebench R15, the processor scores 685 single-core and 4856 multi-core. In R20, it scores 2856 single-core and 20236 multi-core. In R23, it scores 6802 single-core and 48183 multi-core. These numbers are internally consistent: the R23 multi-core result is more than twice the R20 multi-core result, which aligns with the standard scaling between those test revisions. The single-core results also scale consistently, confirming that the processor is not artificially inflating multi-core scores at the expense of per-thread performance.

Relative to its nearest rivals, the EPYC 7443's aggregate advantage is narrow. It is 0.3% ahead of the Intel Core i5-8400, 0.6% ahead of the Intel Core i7-8750H, and 1.2% ahead of the AMD Ryzen 5 5500U, while trailing the AMD EPYC 7552 by 1.3%. These deltas are small, which suggests that in average benchmark terms these chips are close, but the workload profile of the EPYC 7443 is fundamentally different. The server platform provides ECC memory, eight-channel bandwidth, 128 PCIe Gen 4 lanes, and a large 128 MB L3 cache, all of which support sustained multi-threaded processing rather than short-duration consumer tasks.

The dataset also includes the processor's cache hierarchy and memory bandwidth figures, which help explain the benchmark results. With 204.8 GB/s of memory bandwidth and a shared 128 MB L3 cache, the EPYC 7443 can keep 48 threads supplied with data in memory-intensive applications. The four-die configuration, with each die measuring 81 mm², contributes to the chip's thermal and power profile at a 200 W TDP. The 7 nm process and the TSMC foundry are the underlying technologies that allow this core count and clock speed to coexist in the same package. The resulting balance of single-thread capability and massive multi-thread throughput is the core story of the EPYC 7443 in benchmark terms.