i7-1255U vs i9-12900H

Primary details

Comparing Core i9-12900H and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	351	885
Place by popularity	not in top-100	37
Market segment	Laptop	Laptop
Series	Intel Alder Lake-P	Intel Alder Lake-M
Power efficiency	36.97	53.88
Architecture codename	Alder Lake-H (2022)	Alder Lake-U (2022)
Release date	4 January 2022 (2 years ago)	23 February 2022 (2 years ago)

Detailed specifications

Core i9-12900H 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	14 (Tetradeca-Core)	10 (Deca-Core)
Threads	20	12
Base clock speed	2.5 GHz	1.7 GHz
Boost clock speed	5 GHz	4.7 GHz
L1 cache	80K (per core)	80K (per core)
L2 cache	1.25 MB (per core)	1.25 MB (per core)
L3 cache	24 MB (shared)	12 MB (shared)
Chip lithography	Intel 7 nm	Intel 7 nm
Die size	217 mm2	no data
Maximum core temperature	100 °C	100 °C
64 bit support	+	+
Windows 11 compatibility	+	+

Compatibility

Information on Core i9-12900H 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	1
Socket	FCBGA1744	FCBGA1744
Power consumption (TDP)	45 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-12900H 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	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	+	+
SIPP	+	-
Turbo Boost Max 3.0	+	no data
Deep Learning Boost	+	+

Security technologies

Core i9-12900H and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	+	+
OS Guard	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-12900H and Core i7-1255U are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-12900H and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4, DDR5	DDR4, DDR5
Maximum memory size	64 GB	64 GB
Max memory channels	2	2

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel® Iris® Xe Graphics eligible	Intel® Iris® Xe Graphics eligible
Quick Sync Video	+	+
Graphics max frequency	1.45 GHz	1.25 GHz
Execution Units	96	96

Graphics interfaces

Available interfaces and connections of Core i9-12900H and Core i7-1255U integrated GPUs.

Number of displays supported

4

4

Graphics image quality

Maximum display resolutions supported by Core i9-12900H and Core i7-1255U integrated GPUs, including resolutions over different interfaces.

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

Graphics API support

APIs supported by Core i9-12900H and Core i7-1255U integrated GPUs, sometimes API versions are included.

DirectX	12.1	12.1
OpenGL	4.6	4.6

Peripherals

Specifications and connection of peripherals supported by Core i9-12900H and Core i7-1255U.

PCIe version	4.0	4.0
PCI Express lanes	20	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.

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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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Pros & cons summary

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Performance score	17.58	8.54
Recency	4 January 2022	23 February 2022
Physical cores	14	10
Threads	20	12
Power consumption (TDP)	45 Watt	15 Watt

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Should you still have questions on choice between Core i9-12900H and Core i7-1255U, ask them in Comments section, and we shall answer.

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