AMD EPYC 9845

The AMD EPYC 9845 is a 160-core, 320-thread server processor built on the Zen 5 architecture, codenamed Turin, and manufactured on a 3 nm process by TSMC. It sits in the EPYC 9005 series, targeting the highest-density compute tiers of the server and workstation market. With a base clock of 2.10 GHz and a boost clock of 3.70 GHz, the data positions this part as a massive parallel throughput engine rather than a frequency-optimized performer, a characterization confirmed by its benchmark results.

Single-Thread vs Multi-Thread Behavior

The single-thread scores for the EPYC 9845 are respectable but clearly secondary to its multi-thread capabilities. In Cinebench R23, the single-core score is 18358, while the multi-core score reaches 130037. That represents a roughly 7x scaling factor from one core to all 160 cores, which is typical for a dense server part where the focus is on aggregate throughput. The PassMark single-thread score of 3144 further illustrates that per-core performance, while not weak, is not the defining trait of this processor.

The multi-thread results are where the processor distinguishes itself. The Cinebench R20 multi-core score of 54615 and the R15 multi-core score of 13107 show a consistent pattern: the EPYC 9845 is engineered to dominate heavily parallel workloads. The PassMark multithread score of 152985 reinforces this, with integer math scoring 1687531 and floating-point math scoring 978377. For real workloads, this split means the EPYC 9845 excels in rendering, scientific simulation, data processing, and any task that can utilize dozens or hundreds of threads. Conversely, lightly threaded applications—such as legacy single-core software or basic office tasks—will not see the same proportional benefit, though the Zen 5 architecture ensures they remain adequately responsive.

Data compression and encryption scores from PassMark highlight the processor's strength in data-centric tasks. The data compression score of 4680013 is exceptionally high, while data encryption scores 296808, indicating robust capabilities for database and security workloads. The extended instructions score of 314798 suggests strong performance in vectorized and SIMD-heavy code, which is common in modern scientific and financial computing.

Power and Thermals

The EPYC 9845 carries a TDP of 390 watts, placing it firmly in the high-power, high-performance class of server processors. This TDP level implies that the processor requires a serious cooling solution—likely a high-end air cooler or a liquid cooling system designed for dense server chassis. The data does not specify thermal dissipation beyond the TDP, but the 390-watt figure dictates that system integrators must plan for substantial heat removal to sustain boost clocks under sustained load.

The 3 nm process node from TSMC helps mitigate some of the thermal challenges, as the manufacturing technology is designed for efficiency relative to older nodes. However, 160 active cores drawing power under full load will generate significant heat. The base clock of 2.10 GHz is modest, which suggests the processor is designed to maintain a consistent power envelope across all cores rather than aggressively boosting a few. The boost clock of 3.70 GHz is available for lighter, bursty workloads, but sustained all-core operation will likely settle near the base clock depending on cooling and power delivery limits.

For a typical server deployment, this TDP class means dual-socket systems or high-end single-socket workstations must have robust power delivery and cooling infrastructure. The data shows no unlocked multiplier, so overclocking is not a consideration; the processor operates within its specified power and thermal limits.

Benchmark Performance

Benchmark results indicate that the EPYC 9845 sits at the absolute top of the CPU hierarchy, with a percentile rank of 100 among all tested CPUs. Its average benchmark score is 523613, a figure that places it ahead of most rivals but with notable caveats. Compared to the AMD EPYC 9755, the EPYC 9845 is 3.5% faster on average, a modest lead that reflects the 9755's similar architecture and core count. Against the EPYC 9745, the lead expands to 22.9%, showing a significant generational or core-count advantage.

The comparison to the EPYC 9965 is more complex. The 9965 scores 12% higher on average, meaning the EPYC 9845 is not the absolute fastest in the EPYC 9005 lineup. The 9965 likely benefits from higher clocks or a different core configuration, but the data only provides average scores, not per-test breakdowns. In single-thread tests, the EPYC 9845 scores 18358 in Cinebench R23, which is strong for a 160-core part, but the 9965's advantage suggests it may have a higher boost clock or better single-core tuning.

The Ryzen Threadripper PRO 9995WX, a workstation-focused competitor, scores 28.8% lower on average than the EPYC 9845. This gap underlines the EPYC's server-oriented design: it trades some per-core performance and platform features for sheer core count and memory bandwidth. In PassMark tests, the EPYC 9845's physics score of 19631 and random string sorting score of 538060 indicate strong performance in structured workloads, while the find prime numbers score of 1255 is relatively low, suggesting that some integer-heavy single-thread tasks are not its forte.

Who Should Consider It

The EPYC 9845 is for workloads that scale with core count and memory bandwidth. Organizations running large-scale virtualization, where dozens of virtual machines share the physical processor, will benefit from the 160 cores and 320 threads. High-performance computing (HPC) applications—such as weather modeling, molecular dynamics, and finite element analysis—are ideal candidates, as these workloads typically parallelize across hundreds of threads. The 576.0 GB/s memory bandwidth and twelve-channel DDR5 support mean that memory-bound applications, like large in-memory databases or real-time analytics, will see substantial gains.

For content creation, the EPYC 9845 is a niche choice. Video rendering and 3D animation can leverage the multi-core scores, but the single-thread performance, while adequate, is not class-leading. Gamers should not consider this processor; the single-thread score of 3144 in PassMark is far below what consumer-focused parts offer, and the 390-watt TDP is impractical for desktop use. Office productivity suites, which are largely single-threaded, will run fine but will not use the processor's full potential.

The data suggests the EPYC 9845 is best suited for server racks and professional workstations where throughput is the primary metric. If a workload is embarrassingly parallel and can utilize 320 threads, this processor delivers near-top-tier performance. If a workload is latency-sensitive or lightly threaded, lower-core-count parts from the same or older generations would be more cost-effective, though pricing is not analyzed here.

Platform and Compatibility

The EPYC 9845 uses the AMD Socket SP5 platform, which is the standard for the EPYC 9005 series. It supports DDR5 memory across a twelve-channel bus, providing a theoretical memory bandwidth of 576.0 GB/s, which is critical for feeding 160 cores. ECC memory is supported, ensuring data integrity for server environments where corruption is unacceptable. The processor provides 128 PCIe Gen 5 lanes from the CPU, enabling high-speed connectivity for NVMe storage, GPUs, and network adapters.

The platform supports a 3 nm process and the Zen 5c architecture, which is a dense variant of Zen 5 optimized for core count rather than clock speed. The upgrade path is defined by the SP5 socket: systems built for EPYC 9005 processors can potentially accommodate other parts in the same series, but the data does not specify cross-generation compatibility. The processor has no integrated graphics, so a discrete GPU is required for display output, though this is standard for server parts.

The launch MSRP is $13564, positioning it in the high end of the server market. The production status is active, and the release date is October 9, 2024. The part number is 100-000001458, and the multiplier is locked, meaning no user overclocking. For system builders, the platform requires a motherboard with SP5 socket support, twelve-channel memory traces, and adequate power delivery for the 390-watt TDP.

FAQ

Q: How many cores and threads does the AMD EPYC 9845 have?

A: The EPYC 9845 has 160 cores and 320 threads, based on the Zen 5c architecture.

Q: What is the boost clock speed of the EPYC 9845?

A: The boost clock is 3.70 GHz, while the base clock is 2.10 GHz.

Q: What memory type and bandwidth does the EPYC 9845 support?

A: It supports DDR5 memory across a twelve-channel bus, with a maximum memory bandwidth of 576.0 GB/s. ECC memory is also supported.

Q: How does the EPYC 9845 compare to the EPYC 9965 in performance?

A: The EPYC 9965 scores 12% higher on average, meaning the 9845 is not the fastest in its series but remains in the top percentile of all CPUs.

Q: Does the EPYC 9845 have integrated graphics?

A: No, the EPYC 9845 has no integrated graphics; a discrete GPU is required for display output.

Q: What is the TDP of the EPYC 9845?

A: The thermal design power is 390 watts, requiring a high-end cooling solution suitable for dense server systems.