i7-8665UE vs i7-1255U

Primary details

Comparing Core i7-1255U and Core i7-8665UE processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	895	1601
Place by popularity	74	not in top-100
Market segment	Laptop	Laptop
Series	Intel Alder Lake-M	no data
Power efficiency	53.85	20.52
Architecture codename	Alder Lake-U (2022)	Whiskey Lake-U (2018−2019)
Release date	23 February 2022 (2 years ago)	1 October 2018 (6 years ago)
Launch price (MSRP)	no data	$409

Detailed specifications

Core i7-1255U and Core i7-8665UE 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	10 (Deca-Core)	4 (Quad-Core)
Threads	12	8
Base clock speed	1.7 GHz	1.7 GHz
Boost clock speed	4.7 GHz	4.4 GHz
L1 cache	80K (per core)	64 KB (per core)
L2 cache	1.25 MB (per core)	256 KB (per core)
L3 cache	12 MB (shared)	8 MB (shared)
Chip lithography	Intel 7 nm	14 nm
Maximum core temperature	100 °C	no data
64 bit support	+	+
Windows 11 compatibility	+	+

Compatibility

Information on Core i7-1255U and Core i7-8665UE 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	Intel BGA 1528
Power consumption (TDP)	15 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-1255U and Core i7-8665UE. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2	no data
AES-NI	+	+
FMA	+	-
AVX	+	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	+	no data
Hyper-Threading Technology	+	no data
TSX	+	+
Thermal Monitoring	+	-
Flex Memory Access	+	no data
Deep Learning Boost	+	-

Security technologies

Core i7-1255U and Core i7-8665UE technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	no data
Secure Key	+	no data
OS Guard	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-1255U and Core i7-8665UE are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-1255U and Core i7-8665UE. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4, DDR5	DDR3, DDR4
Maximum memory size	64 GB	no data
Max memory channels	2	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel® Iris® Xe Graphics eligible	Intel UHD Graphics 620
Quick Sync Video	+	-
Graphics max frequency	1.25 GHz	no data
Execution Units	96	no data

Graphics interfaces

Available interfaces and connections of Core i7-1255U and Core i7-8665UE integrated GPUs.

Number of displays supported

4

no data

Graphics image quality

Maximum display resolutions supported by Core i7-1255U and Core i7-8665UE integrated GPUs, including resolutions over different interfaces.

Max resolution over HDMI 1.4	4096 x 2304 @ 60Hz	no data
Max resolution over eDP	4096 x 2304 @ 120Hz	no data
Max resolution over DisplayPort	7680 x 4320 @ 60Hz	no data

Graphics API support

APIs supported by Core i7-1255U and Core i7-8665UE integrated GPUs, sometimes API versions are included.

DirectX	12.1	no data
OpenGL	4.6	no data

Peripherals

Specifications and connection of peripherals supported by Core i7-1255U and Core i7-8665UE.

PCIe version	4.0	3.0
PCI Express lanes	20	16

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	8.53	3.25
Recency	23 February 2022	1 October 2018
Physical cores	10	4
Threads	12	8

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Should you still have questions on choice between Core i7-1255U and Core i7-8665UE, ask them in Comments section, and we shall answer.

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