i7-1255U vs i9-11900K

Primary details

Comparing Core i9-11900K and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	428	896
Place by popularity	not in top-100	74
Cost-effectiveness evaluation	18.87	no data
Market segment	Desktop processor	Laptop
Series	no data	Intel Alder Lake-M
Power efficiency	12.00	53.82
Architecture codename	Rocket Lake (2021)	Alder Lake-U (2022)
Release date	16 March 2021 (3 years ago)	23 February 2022 (2 years ago)
Launch price (MSRP)	$539	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i9-11900K 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	8 (Octa-Core)	10 (Deca-Core)
Threads	16	12
Base clock speed	3.5 GHz	1.7 GHz
Boost clock speed	5.2 GHz	4.7 GHz
Bus rate	8 GT/s	no data
L1 cache	80 KB (per core)	80K (per core)
L2 cache	512 KB (per core)	1.25 MB (per core)
L3 cache	16 MB (shared)	12 MB (shared)
Chip lithography	14 nm	10 nm
Die size	276 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 i9-11900K 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	FCLGA1200	Intel BGA 1744
Power consumption (TDP)	125 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-11900K 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® AVX-512	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	+	-
Turbo Boost Max 3.0	+	no data
Deep Learning Boost	+	-

Security technologies

Core i9-11900K and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	no data
Secure Key	+	no data
Identity Protection	+	-
SGX	-	no data
OS Guard	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-11900K and Core i7-1255U are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-11900K and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR4, DDR5
Maximum memory size	128 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	50 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card Compare	Intel UHD Graphics 750	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	1.3 GHz	no data
Execution Units	32	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i9-11900K and Core i7-1255U integrated GPUs.

Number of displays supported

3

no data

Graphics image quality

Maximum display resolutions supported by Core i9-11900K and Core i7-1255U integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2160@60Hz	no data
Max resolution over eDP	5120 x 3200 @60Hz	no data
Max resolution over DisplayPort	5120 x 3200 @60Hz	no data

Graphics API support

APIs supported by Core i9-11900K and Core i7-1255U integrated GPUs, sometimes API versions are included.

DirectX	12.1	no data
OpenGL	4.5	no data

Peripherals

Specifications and connection of peripherals supported by Core i9-11900K 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	15.85	8.53
Integrated graphics card	4.50	9.21
Recency	16 March 2021	23 February 2022
Physical cores	8	10
Threads	16	12
Chip lithography	14 nm	10 nm
Power consumption (TDP)	125 Watt	15 Watt

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Should you still have questions on choice between Core i9-11900K and Core i7-1255U, ask them in Comments section, and we shall answer.

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