Xeon 638 vs EPYC 7642
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 139 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 5.00 | no data |
| Market segment | Server | Server |
| Series | AMD EPYC | no data |
| Power efficiency | 6.36 | no data |
| Designer | AMD | Intel |
| Manufacturer | TSMC | Intel |
| Architecture codename | Zen 2 (2019−2020) | Granite Rapids (2024−2026) |
| Release date | 7 August 2019 (6 years ago) | 2 February 2026 (recently) |
| Launch price (MSRP) | $4,775 | $899 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Detailed specifications
EPYC 7642 and Xeon 638 basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.
| Physical cores | 48 (Octatetraconta-Core) | 16 (Hexadeca-Core) |
| Performance-cores | no data | 16 |
| Threads | 96 | 32 |
| Base clock speed | 2.4 GHz | 3.2 GHz |
| Boost clock speed | 3.4 GHz | 4.8 GHz |
| Bus rate | no data | 0 GT/s |
| Multiplier | 23 | no data |
| L1 cache | 96K (per core) | 112 KB (per core) |
| L2 cache | 512K (per core) | 2 MB (per core) |
| L3 cache | 256 MB (shared) | 72 MB (shared) |
| Chip lithography | 7 nm, 14 nm | Intel 3 nm |
| Die size | 192 mm2 | 598 mm2 |
| Maximum case temperature (TCase) | no data | 76 °C |
| Number of transistors | 4,800 million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
| Unlocked multiplier | + | + |
Compatibility
Information on EPYC 7642 and Xeon 638 compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.
| Number of CPUs in a configuration | 2 (Multiprocessor) | 1 |
| Socket | TR4 | FCLGA4710 |
| Power consumption (TDP) | 225 Watt | 180 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by EPYC 7642 and Xeon 638. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® AMX, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512 |
| AES-NI | + | + |
| AVX | + | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | no data | + |
| Speed Shift | no data | + |
| Turbo Boost Technology | no data | 2.0 |
| Hyper-Threading Technology | no data | + |
| TSX | - | + |
| Turbo Boost Max 3.0 | no data | + |
| Precision Boost 2 | + | no data |
| Deep Learning Boost | - | + |
Security technologies
EPYC 7642 and Xeon 638 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
| EDB | no data | + |
| SGX | no data | - |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by EPYC 7642 and Xeon 638 are enumerated here.
| AMD-V | + | - |
| VT-d | no data | + |
| VT-x | no data | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by EPYC 7642 and Xeon 638. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4 Eight-channel | DDR5(6400MT/s) |
| Maximum memory size | 4 TiB | 2 TB |
| Max memory channels | 8 | 4 |
| Maximum memory bandwidth | 204.763 GB/s | no data |
| ECC memory support | + | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | N/A |
Peripherals
Specifications and connection of peripherals supported by EPYC 7642 and Xeon 638.
| PCIe version | no data | 5.0 |
| PCI Express lanes | no data | 80 |
Pros & cons summary
| Recency | 7 August 2019 | 2 February 2026 |
| Physical cores | 48 | 16 |
| Threads | 96 | 32 |
| Power consumption (TDP) | 225 Watt | 180 Watt |
EPYC 7642 has 200% more physical cores and 200% more threads.
Xeon 638, on the other hand, has an age advantage of 6 years, and 25% lower power consumption.
We couldn't decide between AMD EPYC 7642 and Intel Xeon 638. We've got no test results to judge.
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