Ultra 7 251HX vs EPYC 7643P
Aggregate performance score
EPYC 7643P outperforms Core Ultra 7 251HX by an impressive 59% based on our aggregate benchmark results.
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 78 | 244 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 10.53 | no data |
| Market segment | Server | Laptop |
| Series | no data | Intel Arrow Lake |
| Power efficiency | 8.25 | no data |
| Designer | AMD | Intel |
| Manufacturer | TSMC | no data |
| Architecture codename | Milan (2021−2023) | Arrow Lake-HX (2025−2026) |
| Release date | 5 September 2023 (2 years ago) | 1 April 2026 (less than a year ago) |
| Launch price (MSRP) | $2,722 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Currently popular graphics cards are shown for comparison.
Detailed specifications
Basic parameters of EPYC 7643P and Core Ultra 7 251HX: 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) | 18 (Octadeca-Core) |
| Threads | 96 | 18 |
| Base clock speed | 2.3 GHz | 2.5 GHz |
| Boost clock speed | 3.6 GHz | 5.1 GHz |
| L1 cache | 64 KB (per core) | no data |
| L2 cache | 512 KB (per core) | 30 MB |
| L3 cache | 256 MB (shared) | 30 MB |
| Chip lithography | 7 nm | 3 nm |
| Die size | 8x 81 mm2 | no data |
| Number of transistors | 33,200 million | no data |
| 64 bit support | - | + |
Compatibility
Information on EPYC 7643P and Core Ultra 7 251HX 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 | no data |
| Socket | SP3 | no data |
| Power consumption (TDP) | 225 Watt | no data |
Technologies and extensions
Technological solutions and additional instructions supported by EPYC 7643P and Core Ultra 7 251HX. You'll probably need this information if you require some particular technology.
| AES-NI | + | - |
| AVX | + | - |
| Precision Boost 2 | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by EPYC 7643P and Core Ultra 7 251HX are enumerated here.
| AMD-V | + | - |
Memory specs
Types, maximum amount and channel quantity of RAM supported by EPYC 7643P and Core Ultra 7 251HX. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4 | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | N/A | Intel Graphics 4-Core iGPU (Meteor / Arrow Lake) (300 - 1800 MHz) |
Peripherals
Specifications and connection of peripherals supported by EPYC 7643P and Core Ultra 7 251HX.
| PCIe version | 4.0 | no data |
| PCI Express lanes | 128 | no data |
Synthetic benchmarks
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance. Other than that, Passmark measures multi-core performance.
Pros & cons summary
| Performance score | 45.23 | 28.50 |
| Recency | 5 September 2023 | 1 April 2026 |
| Physical cores | 48 | 18 |
| Threads | 96 | 18 |
| Chip lithography | 7 nm | 3 nm |
EPYC 7643P has a 59% higher aggregate performance score, and 167% more physical cores and 433% more threads.
Ultra 7 251HX, on the other hand, has an age advantage of 2 years, and a 133% more advanced lithography process.
The AMD EPYC 7643P is our recommended choice as it beats the Intel Core Ultra 7 251HX in performance tests.
Be aware that EPYC 7643P is a server/workstation processor while Core Ultra 7 251HX is a notebook one.
Other comparisons
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