i7-1255U vs i7-8700K
Aggregate performance score
Primary details
Comparing Core i7-8700K and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 887 | 896 |
| Place by popularity | not in top-100 | 74 |
| Cost-effectiveness evaluation | 4.53 | no data |
| Market segment | Desktop processor | Laptop |
| Series | Intel Core i7 | Intel Alder Lake-M |
| Power efficiency | 8.54 | 53.82 |
| Architecture codename | Coffee Lake-S (2017−2018) | Alder Lake-U (2022) |
| Release date | 5 October 2017 (7 years ago) | 23 February 2022 (2 years ago) |
| Launch price (MSRP) | $359 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Core i7-8700K and Core i7-1255U 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) | 10 (Deca-Core) |
| Threads | 12 | 12 |
| Base clock speed | 3.7 GHz | 1.7 GHz |
| Boost clock speed | 4.7 GHz | 4.7 GHz |
| Bus type | DMI 3.0 | no data |
| Bus rate | 4 × 8 GT/s | no data |
| Multiplier | 37 | no data |
| L1 cache | 64K (per core) | 80K (per core) |
| L2 cache | 256K (per core) | 1.25 MB (per core) |
| L3 cache | 12288 KB | 12 MB (shared) |
| Chip lithography | 14 nm | 10 nm |
| Die size | 149 mm2 | no data |
| Maximum core temperature | 100 °C | 100 °C |
| Maximum case temperature (TCase) | 72 °C | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | + | + |
| Unlocked multiplier | + | - |
Compatibility
Information on Core i7-8700K and Core i7-1255U 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) | 1 |
| Socket | FCLGA1151 | Intel BGA 1744 |
| Power consumption (TDP) | 95 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i7-8700K and Core i7-1255U. 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 | + | + |
| FMA | - | + |
| AVX | + | + |
| vPro | + | no data |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | 2.0 | no data |
| Hyper-Threading Technology | + | no data |
| TSX | + | + |
| Idle States | + | no data |
| Thermal Monitoring | + | - |
| SIPP | + | - |
Security technologies
Core i7-8700K and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| 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 i7-8700K and Core i7-1255U are enumerated here.
| AMD-V | + | - |
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core i7-8700K and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3, DDR4 | DDR4, DDR5 |
| Maximum memory size | 128 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 Compare | Intel UHD Graphics 630 | Intel Iris Xe Graphics G7 96EUs ( - 1250 MHz) |
| Max video memory | 64 GB | no data |
| Quick Sync Video | + | - |
| Clear Video | + | no data |
| Clear Video HD | + | no data |
| Graphics max frequency | 1.2 GHz | no data |
| InTru 3D | + | no data |
Graphics interfaces
Available interfaces and connections of Core i7-8700K and Core i7-1255U integrated GPUs.
| Number of displays supported | 3 | no data |
Graphics image quality
Maximum display resolutions supported by Core i7-8700K and Core i7-1255U integrated GPUs, including resolutions over different interfaces.
| 4K resolution support | + | no data |
| Max resolution over HDMI 1.4 | 4096 x 2304@24Hz | no data |
| Max resolution over eDP | 4096 x 2304@60Hz | no data |
| Max resolution over DisplayPort | 4096 x 2304@60Hz | no data |
Graphics API support
APIs supported by Core i7-8700K and Core i7-1255U 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 i7-8700K and Core i7-1255U.
| PCIe version | 3.0 | 4.0 |
| PCI Express lanes | 16 | 20 |
Synthetic benchmark performance
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. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
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.
Cinebench 15 64-bit multi-core
Cinebench Release 15 Multi Core is a variant of Cinebench R15 which uses all the processor threads.
Cinebench 15 64-bit single-core
Cinebench R15 (standing for Release 15) is a benchmark made by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version (sometimes called Single-Thread) only uses a single processor thread to render a room full of reflective spheres and light sources.
Geekbench 5.5 Multi-Core
Blender(-)
Geekbench 5.5 Single-Core
Pros & cons summary
| Performance score | 8.57 | 8.53 |
| Integrated graphics card | 3.10 | 9.21 |
| Recency | 5 October 2017 | 23 February 2022 |
| Physical cores | 6 | 10 |
| Chip lithography | 14 nm | 10 nm |
| Power consumption (TDP) | 95 Watt | 15 Watt |
i7-8700K has a 0.5% higher aggregate performance score.
i7-1255U, on the other hand, has 197.1% faster integrated GPU, an age advantage of 4 years, 66.7% more physical cores, a 40% more advanced lithography process, and 533.3% lower power consumption.
Given the minimal performance differences, no clear winner can be declared between Core i7-8700K and Core i7-1255U.
Note that Core i7-8700K is a desktop processor while Core i7-1255U is a notebook one.
Should you still have questions on choice between Core i7-8700K and Core i7-1255U, ask them in Comments section, and we shall answer.
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