Intel Core i7-1255U
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CPU overview Intel Core i7-1255U ( C/T). Alder Lake U, 10 nm, 15 W TDP.

Overall score
star star star star star
Released
Q1/2022
Intel Core i7-1255U

Intel Core i7-1255U

The Intel Core i7-1255U processor is released Q1/2022 on the Alder Lake U architecture. It runs at a starting clock frequency of and is manufactured using the 10 nm process. Intel Core i7-1255U uses threads with active cores. It is set to Mobile in BGA 1744. The TDP of the Intel Core i7-1255U processor model is 15 W. The L2 cache memory size is 6.50 MB and the L3 is 12.00 MB. The memory support is DDR4-3200, DDR5-4800, LPDDR4X-4266, LPDDR5-5200.
Performance tests
Real tests Intel Core i7-1255U
Specifications
Complete list of technical specifications
CPU generation and family

Let's start our review of the Intel Core i7-1255U processor by exploring its basic specifications, namely: the model code name, the segment of use (server, workstation, computer or laptop), the generation of the processor (its previous model), and the family group. All data is taken from the manufacturer's official source.

  • Name
    Intel Core i7-1255U
  • Family
    Intel Core i7
  • CPU group
    Intel Core i 1200P/1200U
  • Segment
    Mobile
  • Generation
    12
  • Successor
    Intel Core i7-1355U
CPU Cores and Base Frequency

Technical information about the CPU Intel Core i7-1255U base clock frequency, number of processor cores, processor threads, as well as turbo frequency of cores in single-threaded and multithreaded mode. Pay attention to overclocking and hyperthreading support. All of these specifications directly affect the performance of the model in work applications or games. A higher values, more the faster will be the processor.

  • CPU Cores / Threads
    10 / 12
  • Core architecture
    hybrid (big.LITTLE)
  • A-Core
    2x Golden Cove
  • B-Core
    8x Gracemont
  • Hyperthreading / SMT
    Yes
  • Overclocking
    No
  • A-Core Frequency
    1.70 GHz (4.70 GHz)
  • B-Core Frequency
    1.20 GHz (3.50 GHz)
Internal Graphics

Integrating a graphics core into the processor complements its functionality, but not all manufacturers (AMD or Intel) integrate iGPU into their CPUs. Even if the processor has an integrated graphics card, its power is hardly enough for modern games, so these features do not affect the overall performance of the processor. If Intel Core i7-1255U supports an integrated graphics core, you can see its specifications below.

  • GPU name
    Intel Iris Xe Graphics 96 (Alder Lake)
  • GPU frequency
    0.35 GHz
  • GPU (Turbo)
    1.25 GHz
  • Execution units
    96
  • Shader
    768
  • Max. GPU Memory
    32 GB
  • Max. displays
    4
  • Generation
    13
  • Direct X
    12.1
  • Technology
    10 nm
  • Release date
    Q1/2022
Hardware codec support

Hardware codecs help processors convert blocks of data into a sequence of images or sound. In modern processors, the need to support hardware codecs is not a priority, so these characteristics are not considered in the overall Intel Core i7-1255U performance rating.

  • h265 / HEVC (8 bit)
    Decode / Encode
  • h265 / HEVC (10 bit)
    Decode / Encode
  • h264
    Decode / Encode
  • VP8
    Decode
  • VP9
    Decode / Encode
  • AV1
    Decode
  • AVC
    Decode / Encode
  • VC-1
    Decode
  • JPEG
    Decode / Encode
Memory & PCIe

Memory specs Intel Core i7-1255U are very important, the overall performance and ranking depends on these characteristics, also, the memory supported by the processor Intel Core i7-1255U in the format: memory type / maximum quantity - should be studied before upgrading for compatibility with the motherboard. Pay attention to the PCIexpress version, the higher it is, the better. You can also find out the maximum number of memory channels supported by the processor and the number of PCIE lanes here.

  • Memory type
    DDR4-3200, DDR5-4800, LPDDR4X-4266, LPDDR5-5200
  • Max. Memory
    64 GB
  • Memory channels
    2 (Dual Channel)
  • Bandwidth
    76.8 GB/s
  • ECC
    No
  • PCIe
    4.0 x 28
  • AES-NI
    Yes
Thermal Management

When you are going to upgrade your computer, you should choose your processor carefully, especially paying attention to temperature ratings and TDP. Look at the operating and maximum temperatures of the processor Intel Core i7-1255U and the TDP at PL1 and PL2 levels. The final power of the power supply will depend on this data, as well as the number of power phases on the motherboard.

  • TDP (PL1)
    15 W
  • TDP (PL2)
    55 W
  • Tjunction max.
    100 \xc2\xb0C
Technical details

An overview of the Intel Core i7-1255U processor specifications will show which sets of ISA instructions are supported by the model, what motherboard Intel Core i7-1255U is compatible with and what process technology the chip is manufactured on. Also, pay attention to the L2 and L3 cache size. The higher it is, the faster the data is processed.

  • Technology
    10 nm
  • Chip design
    Monolithic
  • Socket
    BGA 1744
  • L2-Cache
    6.50 MB
  • L3-Cache
    12.00 MB
  • Architecture
    Alder Lake U
  • Operating systems
    Windows 10, Windows 11, Linux
  • Virtualization
    VT-x, VT-x EPT, VT-d
  • Instruction set (ISA)
    x86-64 (64 bit)
  • ISA extensions
    SSE4.1, SSE4.2, AVX2
  • Release date
    Q1/2022
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