AMD EPYC 9645
Expert rating8.7 / 10
- Brand:
- AMD
- Form Factor:
- Server & Enthusiast
- CPU Socket:
- SP5
- Core/Thread Count:
- 96C/192T
- TDP:
- 370W
- iGPU:
- None
- CPU Series:
- EPYC
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Manufacturer: AMD Last updated: 2026-09-11
AMD EPYC 9645 Review
AMD EPYC 9645 96-core 192-thread SP5 server processor, 2.3GHz base / 4.0GHz boost, 370W TDP, 384MB L3 cache, Zen 5c "Turin Dense"
The EPYC 9645 is a dense Zen 5c server processor built for cloud-native workloads that want more cores per socket than the standard Zen 5 lineup offers. Rated for 370W, it pairs 96 cores and 192 threads with a 2.3GHz base clock that boosts up to 4.0GHz, backed by 384MB of L3 cache on AMD's SP5 platform.
Core Count and Workload Fit
With 96 cores and 192 threads packed into the Zen 5c dense core design, the EPYC 9645 targets container-heavy virtualization hosts and cloud tenancy workloads that scale near-linearly with core count. The 2.3GHz base clock trades single-thread headroom for density, boosting to 4.0GHz under lighter loads. The 384MB L3 cache is shared across a large core count, so per-core cache allocation is modest by EPYC standards.
Platform, Memory, and Cooling
The EPYC 9645 runs on AMD's SP5 platform with 12-channel DDR5 memory support and up to 128 PCIe 5.0 lanes per socket, giving it strong memory bandwidth relative to its core count. It supports both single-socket (1P) and dual-socket (2P) designs. At 370W it needs server-grade, high-static-pressure cooling rather than desktop hardware.
Comparison to Alternatives
Against the standard-core EPYC 9654 in this catalog, the EPYC 9645 gives up some per-core clock speed for a denser Zen 5c layout at a lower TDP. Compared to the even denser 128-core EPYC 9745 also in this catalog, it is the more moderate step up in core count for teams not ready to commit to the largest dense SKU. It undercuts comparable Intel Xeon Scalable dense-core parts in this catalog on memory channel count.
Our verdict
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating8.7 / 10
The EPYC 9645 is a solid mid-tier dense-core option for cloud hosts that want more cores per socket without jumping to AMD's largest dense SKUs.
Best for
- Cloud tenancy and container hosting
- Dense virtualization at moderate power
- Scale-out web tiers
Not for
- Single-thread-sensitive workloads
- Maximum absolute core count needs
- Cache-bound technical computing
Specifications
What these specs meanCores and threads
| Core Count | 96 cores |
|---|---|
| Thread Count | 192 threads |
| Core Architecture | Zen 5c "Turin Dense" |
Clocks
| Base Clock | 2.3 GHz |
|---|---|
| Boost Clock | 4.0 GHz |
Cache
| L3 Cache | 384 MB |
|---|
Platform
| Socket | SP5 |
|---|---|
| Multi-Socket Support | 1P/2P |
Memory
| Memory Channels | 12 channels |
|---|---|
| ECC Support | Yes |
Power and thermals
| TDP | 370 W |
|---|
Measured results
SPEC CPU 2017
Best published result on spec.org as of 23 Sept 2026.
| SPECrate® 2017 Integer (base) | 1,080 |
Cores 96 · Tested in ASUS RS520QA-E13-RS8U (2.30 GHz, AMD EPYC 9645) · Published by ASUSTeK Computer Inc., Nov-2025
Full disclosure on spec.org| SPECrate® 2017 Floating Point (base) | 999 |
Cores 96 · Tested in ASUS RS520QA-E13-RS8U (2.30 GHz, AMD EPYC 9645) · Published by ASUSTeK Computer Inc., Nov-2025
Full disclosure on spec.org| SPECrate® 2017 Integer (base) | 2,150 |
Cores 192 · Tested in ASUS RS720A-E13-RS8U (2.30 GHz, AMD EPYC 9645) · Published by ASUSTeK Computer Inc., Jul-2025
Full disclosure on spec.org| SPECrate® 2017 Floating Point (base) | 1,990 |
Cores 192 · Tested in ASUS RS720A-E13-RS8U (2.30 GHz, AMD EPYC 9645) · Published by ASUSTeK Computer Inc., Jul-2025
Full disclosure on spec.orgSPEC®, SPECrate® and SPECspeed® are registered trademarks of the Standard Performance Evaluation Corporation. Copied by permission of the Standard Performance Evaluation Corporation (SPEC). Results retrieved from www.spec.org on 23 Sept 2026.
FAQs
What are the key specifications of the AMD EPYC 9645?
The AMD EPYC 9645 has 96 cores and 192 threads, a 2.3 GHz base and 4.0 GHz boost clock, 384 MB of L3 cache and a 370 W TDP. Socket: SP5.
Will the AMD EPYC 9645 work with my current setup?
The AMD EPYC 9645 lists Socket is SP5. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.
Who is the AMD EPYC 9645 best suited to?
Best suited to: Cloud tenancy and container hosting; Dense virtualization at moderate power; Scale-out web tiers.
What are the drawbacks of the AMD EPYC 9645?
Not the best fit for: Single-thread-sensitive workloads; Maximum absolute core count needs; Cache-bound technical computing.