Core i7-1255U: specs and benchmarks

Summary

Intel started Core i7-1255U sales 23 February 2022. This is an Alder Lake-U architecture notebook processor primarily aimed at office systems. It has 10 cores and 12 threads, and is based on Intel 7 manufacturing technology, with a maximum frequency of 4700 MHz and a locked multiplier.

Compatibility-wise, this is FCBGA1744 processor with a TDP of 15 Watt. It supports DDR4, DDR5 memory.

Primary details

Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and pricing.

Place in the ranking	895
Place by popularity	78
Market segment	Laptop
Series	Intel Alder Lake-M
Power efficiency	53.88	of 100.00 (Core Ultra 7 164U)
Architecture codename	Alder Lake-U (2022)
Release date	23 February 2022 (2 years ago)

Detailed specifications

Basic microprocessor parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters can generally indicate CPU performance, but to be more precise you have to review its test results.

Physical cores	10 (Deca-Core)
Threads	12
Base clock speed	1.7 GHz	of 4.7 GHz (Ryzen 9 7900X)
Boost clock speed	4.7 GHz	of 6.2 GHz (Core i9-14900KS)
L1 cache	80K (per core)	of 80 KB (EPYC 9965)
L2 cache	1.25 MB (per core)	of 2 MB (Xeon 6980P)
L3 cache	12 MB (shared)	of 1152 MB (EPYC 9684X)
Chip lithography	Intel 7 nm	of 3 nm (Core Ultra 9 285K)
Maximum core temperature	100 °C	of 110 °C (Core Ultra 9 185H)
64 bit support	+
Windows 11 compatibility	+

Compatibility

Information on Core i7-1255U compatibility with other computer components and devices: 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	of 8 (Xeon Platinum 8454H)
Socket	FCBGA1744
Power consumption (TDP)	15 Watt	of 500 Watt (Xeon 6960P)

Technologies and extensions

Technological capabilities and additional instructions supported by 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
AES-NI	+
FMA	+
AVX	+
Enhanced SpeedStep (EIST)	+
Speed Shift	+
Hyper-Threading Technology	+
TSX	+
Thermal Monitoring	+
Flex Memory Access	+
Deep Learning Boost	+

Security technologies

Processor technologies aimed at improving security, for example, by protecting against hacks.

TXT	+
EDB	+
Secure Key	+
OS Guard	+

Virtualization technologies

Supported virtual machine optimization technologies. Some are specific to Intel only, some to AMD.

VT-d	+
VT-x	+
EPT	+

Memory specs

Types, maximum amount and channel number of RAM supported by Core i7-1255U's memory controller. Depending on the motherboard, higher memory frequency may be supported.

Supported memory types	DDR4, DDR5
Maximum memory size	64 GB	of 6 TiB (EPYC 9654)
Max memory channels	2	of 12 (Xeon Platinum 9221)

Graphics specifications

General parameters of a GPU integrated into Core i7-1255U.

Integrated graphics card	Intel® Iris® Xe Graphics eligible
Quick Sync Video	+
Graphics max frequency	1.25 GHz
Execution Units	96

Graphics interfaces

Available interfaces and connections of Core i7-1255U's integrated GPU.

Number of displays supported

4

Graphics image quality

Maximum display resolutions supported by Core i7-1255U's integrated GPU, including resolutions over different interfaces.

Max resolution over HDMI 1.4	4096 x 2304 @ 60Hz
Max resolution over eDP	4096 x 2304 @ 120Hz
Max resolution over DisplayPort	7680 x 4320 @ 60Hz

Graphics API support

APIs supported by Core i7-1255U's integrated GPU, sometimes API versions are included.

DirectX	12.1
OpenGL	4.6

Peripherals

Specifications and connection types of supported peripherals.

PCIe version	4.0	of 5.0 (EPYC 9655P)
PCI Express lanes	20	of 128 (EPYC 9655P)

Benchmark performance

Single-core and multi-core benchmark results of Core i7-1255U. Overall benchmark performance is measured in points in 0-100 range, higher is better.

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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.

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Closest competitors

Core i7-1255U's performance relative to its closest rivals among notebook CPUs.

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