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AMD EPYC 9634 vs AMD EPYC 9645
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Summary
The AMD EPYC 9634 and AMD EPYC 9645 are AMD's high-performance server processors, designed for demanding data center, cloud, and HPC applications that require high core counts and extensive I/O capabilities.
The AMD EPYC 9634 utilizes the Zen 4 architecture (Genoa / Genoa-X) in a 5 nm process. It offers 84 MB of Level 2 Cache and 384 MB of Level 3 Cache, supports PCIe 5.0, and a memory bandwidth of 461 GB/s. The AMD EPYC 9645 is based on the newer Zen 5 / Zen 5c architecture (Turin) from the refined 4 nm process.
It features 384 MB of Level 3 Cache, with 0 MB specified for Level 2 Cache. It also offers PCIe 5.0 and a slightly higher memory bandwidth of 480 GB/s. The Zen 5 architecture of the AMD EPYC 9645 promises improved performance per clock cycle compared to Zen 4, which translates into potentially higher single- and multi-core performance for server workloads.
Both EPYC processors are unsuitable for gaming. Specific TDP values are not available, but EPYC processors are known for high power consumption. The 4 nm process of the AMD EPYC 9645 could enable improved energy efficiency per watt compared to the AMD EPYC 9634. As high-end server components, both are expensive.
Their price/performance ratio is measured by their efficiency in business-critical workloads and the total cost in data centers.
The AMD EPYC 9634 utilizes the Zen 4 architecture (Genoa / Genoa-X) in a 5 nm process. It offers 84 MB of Level 2 Cache and 384 MB of Level 3 Cache, supports PCIe 5.0, and a memory bandwidth of 461 GB/s. The AMD EPYC 9645 is based on the newer Zen 5 / Zen 5c architecture (Turin) from the refined 4 nm process.
It features 384 MB of Level 3 Cache, with 0 MB specified for Level 2 Cache. It also offers PCIe 5.0 and a slightly higher memory bandwidth of 480 GB/s. The Zen 5 architecture of the AMD EPYC 9645 promises improved performance per clock cycle compared to Zen 4, which translates into potentially higher single- and multi-core performance for server workloads.
Both EPYC processors are unsuitable for gaming. Specific TDP values are not available, but EPYC processors are known for high power consumption. The 4 nm process of the AMD EPYC 9645 could enable improved energy efficiency per watt compared to the AMD EPYC 9634. As high-end server components, both are expensive.
Their price/performance ratio is measured by their efficiency in business-critical workloads and the total cost in data centers.
AMD EPYC 9634
- Proven Zen 4 Architecture
- 5 nm manufacturing process
- Extensive Level 2 Cache (84 MB)
- High memory bandwidth and PCIe 5.0
AMD EPYC 9645
- Latest Zen 5 / Zen 5c Architecture
- Refined 4 nm manufacturing process
- Potentially higher performance per clock cycle
- Slightly increased memory bandwidth (480 GB/s)
Benchmarks
Performance Overview
Average performance across multiple benchmarks
Single-core performance
Multi-core performance
More benchmarks
Specifications
At a glance
|
Wischen
|
AMD EPYC 9634 | AMD EPYC 9645 |
|---|---|---|
| Family | AMD EPYC (147) | AMD EPYC (147) |
| CPU group | AMD EPYC 9004 (21) | AMD EPYC 9005 (29) |
| Architecture | Genoa / Genoa-X (Zen 4) | Turin (Zen 5 / Zen 5c) |
| Technology | 5 nm | 4 nm |
| Segment | Server | Server |
| Socket | SP5 | SP5 |
| Predecessor | ||
| Successor |
CPU Cores and Base Frequency
|
Wischen
|
AMD EPYC 9634 | AMD EPYC 9645 |
|---|---|---|
| CPU Cores / Threads | 84 / 168 | 96 / 192 |
| Hyperthreading / SMT | ✓ | ✓ |
| Core architecture | normal | normal |
| Cores: | 84x Zen 4 | 96x Zen 5 |
| Frequency: | 2.25 GHz | 2.10 GHz |
| Turbo (1 Core): | 3.70 GHz | |
| Turbo (All Cores): | 3.10 GHz | |
| L2-Cache | 84.00 MB | |
| L3-Cache | 384.00 MB | 384.00 MB |
| Overclocking | ✗ | ✗ |
Integrated graphics (iGPU)
|
Wischen
|
AMD EPYC 9634 | AMD EPYC 9645 |
|---|---|---|
| GPU name | no iGPU | no iGPU |
| GPU frequency | ||
| CUs / Shader | / | / |
| Raytracing | ✗ | ✗ |
| Max. displays | ||
| Max. GPU Memory | ||
| Technology | ||
| Release date |
NPU AI performance
|
Wischen
|
AMD EPYC 9634 | AMD EPYC 9645 |
|---|---|---|
| AI hardware | ||
| AI specifications | ||
| NPU + CPU + iGPU |
Memory & PCIe
|
Wischen
|
AMD EPYC 9634 | AMD EPYC 9645 |
|---|---|---|
| Memory | DDR5-4800 (460.8 GB/s) | DDR5-6000 (480.0 GB/s) |
| Max. Memory | 6144 GB | 6144 GB |
| Memory channels | 12 | 12 |
| ECC | Yes | Yes |
| PCIe | 5.0 x 128 | 5.0 x 128 |
| PCIe Bandwidth | 504.1 GB/s | 504.1 GB/s |
Thermal Management
|
Wischen
|
AMD EPYC 9634 | AMD EPYC 9645 |
|---|---|---|
| TDP | 290 W | 320 W |
| TDP (PL2) | ||
| TDP up | 300 W | |
| TDP down | 240 W | |
| T. junction max. | 100 °C | 100 °C |
Technical details
|
Wischen
|
AMD EPYC 9634 | AMD EPYC 9645 |
|---|---|---|
| Chip design | Chiplet | Chiplet |
| AES-NI | ✓ | ✓ |
| Operating systems | Windows Server 2022, Linux, Windows 11 | Windows Server 2022, Linux, Windows 11 |
| Instruction set | x86-64 (64 bit) | x86-64 (64 bit) |
| ISA extensions | SSE4.2, AVX2, AVX-512, BFLOAT16, VNNI | SSE4.2, AVX2, AVX-512, BFLOAT16, VNNI |
| Release date | Q4/2022 | Q4/2024 |
| Release price | 10304 $ | |
| Documents | Technical data sheet | Technical data sheet |
User Reviews
Your rating
Here you can rate one or both of the processors. The average rating of AMD EPYC 9634 is 5.0 stars (2 ratings), while AMD EPYC 9645 has received 5.0 stars (1 ratings).
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