EPYC 9555 vs i5-8400H
Primary details
Comparing Core i5-8400H and EPYC 9555 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1244 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Server |
| Series | Intel Core i5 | no data |
| Power efficiency | 10.09 | no data |
| Architecture codename | Coffee Lake-H (2018−2019) | Turin (2024) |
| Release date | 2 April 2018 (6 years ago) | 10 October 2024 (less than a year ago) |
| Launch price (MSRP) | $250 | $9,826 |
Detailed specifications
Core i5-8400H and EPYC 9555 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 | 4 (Quad-Core) | 64 (Tetrahexaconta-Core) |
| Threads | 8 | 128 |
| Base clock speed | 2.5 GHz | 3.2 GHz |
| Boost clock speed | 4.2 GHz | 4.4 GHz |
| Bus type | DMI 3.0 | no data |
| Bus rate | 4 × 8 GT/s | no data |
| Multiplier | 25 | no data |
| L1 cache | 256 KB | 80 KB (per core) |
| L2 cache | 1 MB | 1 MB (per core) |
| L3 cache | 8 MB | 256 MB (shared) |
| Chip lithography | 14 nm | 4 nm |
| Die size | 126 mm2 | 8x 70.6 mm2 |
| Maximum core temperature | 100 °C | no data |
| Maximum case temperature (TCase) | 72 °C | no data |
| Number of transistors | no data | 66,520 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
Compatibility
Information on Core i5-8400H and EPYC 9555 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) | 45 Watt | 360 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i5-8400H and EPYC 9555. 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 | + | + |
| vPro | + | no data |
| Enhanced SpeedStep (EIST) | + | no data |
| Speed Shift | + | no data |
| My WiFi | + | no data |
| Turbo Boost Technology | 2.0 | no data |
| Hyper-Threading Technology | + | no data |
| TSX | + | - |
| Idle States | + | no data |
| Thermal Monitoring | + | - |
| Flex Memory Access | + | no data |
| SIPP | + | - |
| Precision Boost 2 | no data | + |
Security technologies
Core i5-8400H and EPYC 9555 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 i5-8400H and EPYC 9555 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 i5-8400H and EPYC 9555. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4 | 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 | 1.1 GHz | no data |
| InTru 3D | + | no data |
Graphics interfaces
Available interfaces and connections of Core i5-8400H and EPYC 9555 integrated GPUs.
| Number of displays supported | 3 | no data |
| eDP | + | no data |
| DisplayPort | + | - |
| HDMI | + | - |
| DVI | + | no data |
Graphics image quality
Maximum display resolutions supported by Core i5-8400H and EPYC 9555 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 |
| Max resolution over VGA | N/A | no data |
Graphics API support
APIs supported by Core i5-8400H and EPYC 9555 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 i5-8400H and EPYC 9555.
| PCIe version | 3.0 | 5.0 |
| PCI Express lanes | 16 | 128 |
Pros & cons summary
| Recency | 2 April 2018 | 10 October 2024 |
| Physical cores | 4 | 64 |
| Threads | 8 | 128 |
| Chip lithography | 14 nm | 4 nm |
| Power consumption (TDP) | 45 Watt | 360 Watt |
i5-8400H has 700% lower power consumption.
EPYC 9555, on the other hand, has an age advantage of 6 years, 1500% more physical cores and 1500% more threads, and a 250% more advanced lithography process.
We couldn't decide between Core i5-8400H and EPYC 9555. We've got no test results to judge.
Be aware that Core i5-8400H is a notebook processor while EPYC 9555 is a server/workstation one.
Should you still have questions on choice between Core i5-8400H and EPYC 9555, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
