3 305 vs Ultra 7 251HX
Aggregate performance score
Core Ultra 7 251HX outperforms Core 3 305 by a whopping 221% 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 | 244 | 1097 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 12.88 |
| Market segment | Laptop | Laptop |
| Series | Intel Arrow Lake | no data |
| Power efficiency | no data | 24.27 |
| Designer | Intel | Intel |
| Manufacturer | no data | Intel |
| Architecture codename | Arrow Lake-HX (2025−2026) | Wildcat Lake (2026) |
| Release date | 1 April 2026 (less than a year ago) | 16 April 2026 (less than a year ago) |
| Launch price (MSRP) | no data | $309 |
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 Core Ultra 7 251HX and Core 3 305: 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 | 18 (Octadeca-Core) | 6 (Hexa-Core) |
| Threads | 18 | 6 |
| Base clock speed | 2.5 GHz | 1.5 GHz |
| Boost clock speed | 5.1 GHz | 4.3 GHz |
| L1 cache | no data | 192 KB |
| L2 cache | 30 MB | 2.5 MB |
| L3 cache | 30 MB | 6 MB (shared) |
| Chip lithography | 3 nm | 3 nm |
| 64 bit support | + | + |
Compatibility
Information on Core Ultra 7 251HX and Core 3 305 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 | no data | 1 |
| Socket | no data | Intel BGA 1516 |
| Power consumption (TDP) | no data | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core Ultra 7 251HX and Core 3 305. You'll probably need this information if you require some particular technology.
| AES-NI | - | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | no data | + |
Security technologies
Core Ultra 7 251HX and Core 3 305 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core Ultra 7 251HX and Core 3 305 are enumerated here.
| VT-d | no data | + |
| VT-x | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core Ultra 7 251HX and Core 3 305. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR5, LPDDR5X |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Intel Graphics 4-Core iGPU (Meteor / Arrow Lake) (300 - 1800 MHz) | Intel Xe3 Graphics (1 Xe) |
Peripherals
Specifications and connection of peripherals supported by Core Ultra 7 251HX and Core 3 305.
| PCIe version | no data | 4.0 |
| PCI Express lanes | no data | 6 |
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 | 28.50 | 8.87 |
| Physical cores | 18 | 6 |
| Threads | 18 | 6 |
Ultra 7 251HX has a 221% higher aggregate performance score, and 200% more physical cores and 200% more threads.
The Intel Core Ultra 7 251HX is our recommended choice as it beats the Intel Core 3 305 in performance tests.
Other comparisons
We've compiled a selection of CPU comparisons, ranging from closely matched processors to other comparisons that may be of interest.
