EPYC 9745 vs i5-8400B
Primary details
Comparing Core i5-8400B and EPYC 9745 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Server |
| Series | Intel Core i5 | no data |
| Architecture codename | Coffee Lake (2017−2019) | Turin (2024) |
| Release date | 2 April 2018 (6 years ago) | 10 October 2024 (recently) |
| Launch price (MSRP) | $182 | $12,141 |
Detailed specifications
Core i5-8400B and EPYC 9745 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 | 6 (Hexa-Core) | 128 |
| Threads | 6 | 256 |
| Base clock speed | 2.8 GHz | 2.4 GHz |
| Boost clock speed | 4 GHz | 3.7 GHz |
| Bus type | DMI 3.0 | no data |
| Bus rate | 4 × 8 GT/s | no data |
| Multiplier | 28 | no data |
| L1 cache | 384 KB | 80 KB (per core) |
| L2 cache | 1.5 MB | 1 MB (per core) |
| L3 cache | 9 MB | 256 MB (shared) |
| Chip lithography | 14 nm | 3 nm |
| Die size | 126 mm2 | no data |
| Maximum core temperature | 100 °C | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
Compatibility
Information on Core i5-8400B and EPYC 9745 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 | 1 (Uniprocessor) | 2 |
| Socket | FCBGA1440 | SP5 |
| Power consumption (TDP) | 65 Watt | 400 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i5-8400B and EPYC 9745. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 | no data |
| AES-NI | + | + |
| AVX | + | + |
| Enhanced SpeedStep (EIST) | + | no data |
| Turbo Boost Technology | 2.0 | no data |
| Hyper-Threading Technology | - | no data |
| Idle States | + | no data |
| Thermal Monitoring | + | - |
| Precision Boost 2 | no data | + |
Security technologies
Core i5-8400B and EPYC 9745 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | no data |
| EDB | + | no data |
| Secure Key | + | no data |
| MPX | + | - |
| Identity Protection | + | - |
| SGX | Yes with Intel® ME | no data |
| OS Guard | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i5-8400B and EPYC 9745 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 Core i5-8400B and EPYC 9745. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4-2666 | DDR5 |
| Maximum memory size | 64 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 42.671 GB/s | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Intel UHD Graphics 630 | N/A |
| Max video memory | 64 GB | no data |
| Quick Sync Video | + | - |
| Clear Video | + | no data |
| Clear Video HD | + | no data |
| Graphics max frequency | 1.05 GHz | no data |
| InTru 3D | + | no data |
Graphics interfaces
Available interfaces and connections of Core i5-8400B and EPYC 9745 integrated GPUs.
| Number of displays supported | 3 | no data |
Graphics image quality
Maximum display resolutions supported by Core i5-8400B and EPYC 9745 integrated GPUs, including resolutions over different interfaces.
| 4K resolution support | + | no data |
| Max resolution over HDMI 1.4 | 4096x2304@30Hz | no data |
| Max resolution over eDP | 4096x2304@60Hz | no data |
| Max resolution over DisplayPort | 4096x2304@60Hz | no data |
Graphics API support
APIs supported by Core i5-8400B and EPYC 9745 integrated GPUs, sometimes API versions are included.
| DirectX | 12 | no data |
| OpenGL | 4.5 | no data |
Peripherals
Specifications and connection of peripherals supported by Core i5-8400B and EPYC 9745.
| PCIe version | 3.0 | 5.0 |
| PCI Express lanes | 16 | 128 |
Pros & cons summary
| Recency | 2 April 2018 | 10 October 2024 |
| Physical cores | 6 | 128 |
| Threads | 6 | 256 |
| Chip lithography | 14 nm | 3 nm |
| Power consumption (TDP) | 65 Watt | 400 Watt |
i5-8400B has 515.4% lower power consumption.
EPYC 9745, on the other hand, has an age advantage of 6 years, 2033.3% more physical cores and 4166.7% more threads, and a 366.7% more advanced lithography process.
We couldn't decide between Core i5-8400B and EPYC 9745. We've got no test results to judge.
Be aware that Core i5-8400B is a notebook processor while EPYC 9745 is a server/workstation one.
Should you still have questions on choice between Core i5-8400B and EPYC 9745, ask them in Comments section, and we shall answer.
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