Intel Core i7 1255U
- Cores: 10
- L3 cache: 12MB (shared)
- TDP: 12-15 W (max. boost up to 55 W)
- Transistor size: 10 nm
Core i7 1255U - laptop processor produced by Intel for socket BGA-1744 that has 10 cores and 12 threads. The base clock frequency of the CPU is 1700 MHz, but due to Turbo Boost technology, it can perform up to 4700 MHz. The size of the L3 cache is 12 MB. Please note that this chip has integrated graphics Intel Iris Xe Graphics (96EU).
Review
Compare Intel Core i7 1255U with other CPUs
Test in Benchmarks
Performance test of Intel Core i7 1255U in benchmarksCinebench
GeekBench v6
| File compression | 626.4 MB/sec |
| Clang compilation | 49.1 Klines/sec |
| HTML 5 Browser | 179.7 pages/sec |
| PDF Renderer | 201.5 Mpixels/sec |
| Text processing | 217.7 pages/sec |
| Background blur | 31.6 images/sec |
| Photo processing | 71.1 images/sec |
| Ray tracing | 9.8 Mpixels/sec |
PassMark
| Integer math | 47.7 GOps/sec |
| Floating point math | 32.2 GOps/sec |
| Find prime numbers | 38M Primes/sec |
| Random string sorting | 16.8M Strings/sec |
| Data encryption | 9.1 GBytes/sec |
| Data compression | 145.7 MBytes/sec |
| Physics | 750 Frames/sec |
| Extended instructions | 8.2B Matrices/sec |
Blender
Performance Per Watt
| Cinebench 2024 / Watt | 29.7 PPW |
| Geekbench 6 Multi / Watt | 477.3 PPW |
| Passmark CPU Mark / Watt | 865.2 PPW |
| Blender / Watt | 5.15 PPW |
These are rough calculations, as most CPUs surpass PL1 TDP wattage even in multicore workloads.
Recent User Tests
| Date | Benchmark | Result |
|---|---|---|
| 📘 2026-02-13 -> Lello75 | GeekBench | 2315 / 7219 |
| 📘 2025-04-13 (kapple) | Cinebench 2024 | 95 / 446 |
Specifications
Core i7 1255U technical specificationsGeneral
| Vendor | Intel |
| Released | February 23, 2022 |
| Type | Laptop |
| Instruction Set | x86-64 |
| Codename | Alder Lake |
| Model number | i7-1255U |
| Integrated GPU | Iris Xe Graphics (96EU) |
| Successor | - Intel Core Ultra 7 255U |
Intel CPU rating - 186th place
CPU
| P-Cores | 2 |
| P-Threads | 4 |
| Base Frequency (P) | 1.7 GHz |
| Turbo Boost Frequency (P) | 4.7 GHz |
| E-Cores | 8 |
| E-Threads | 8 |
| Base Frequency (E) | 1.2 GHz |
| Turbo Boost Frequency (E) | 3.5 GHz |
| Total Cores | 10 |
| Total Threads | 12 |
| Bus Frequency | 100 MHz |
| Multiplier | 17x |
| L1 Cache | 80K (per core) |
| L2 Cache | 1280K (per core) |
| L3 Cache | 12MB (shared) |
| Unlocked Multiplier | No |
Package
| Fabrication Process | 10 nm |
| TDP (PL1) | 12-15 W (configurable) |
| Max. Boost TDP (PL2) | 55 W |
| Socket | BGA-1744 |
| Peak Temperature | 100°C |
iGPU
| Integrated Graphics | Intel Iris Xe Graphics (96EU) |
| GPU Base Clock | 300 MHz |
| GPU Boost Clock | 1250 MHz |
| Shading Units | 768 |
| TMUs | 48 |
| ROPs | 24 |
| Execution Units | 96 |
| TGP | 15 W |
See also: Intel Iris Xe Graphics G7 (96EU) – integrated graphics of Intel Core i7 1255U
Memory Support
| Memory Types | - DDR5-4800 - DDR4-3200 - LPDDR5-5200 - LPDDR4x-4267 |
| Max. Memory Size | 64 GB |
| Memory Channels | 2 |
| ECC Support | No |
Misc
| Official Site | Intel Core i7 1255U official page |
| PCI Express Version | 4.0 |
| PCI Express Lanes | 20 |
| Technologies | - Compute: ABM, ADX, BMI1, BMI2, CLMUL, F16C, SHA
- Performance: EIST, TBT 2.0, TSX
- Virtualization: VT-d, VT-x
- Security: RDRAND, TXT, XD bit |
