i9-12900K vs i5-8257U

Primary details

Comparing Core i5-8257U and Core i9-12900K processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1280	191
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	37.29
Market segment	Laptop	Desktop processor
Series	Intel Core i5	Intel Core i9
Power efficiency	29.63	19.74
Architecture codename	Coffee Lake-U (2018−2019)	Alder Lake, Golden Cove, Gracemont (2021)
Release date	10 July 2019 (5 years ago)	4 November 2021 (3 years ago)
Launch price (MSRP)	no data	$589

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i5-8257U and Core i9-12900K 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	4 (Quad-Core)	16 (Hexadeca-Core)
Threads	8	24
Base clock speed	1.4 GHz	3.2 GHz
Boost clock speed	3.9 GHz	5.2 GHz
Bus type	no data	DMI 4.0
Bus rate	4 GT/s	8 × 16 GT/s
Multiplier	no data	32
L1 cache	256 KB	80K (per core)
L2 cache	1 MB	1.25 MB (per core)
L3 cache	6 MB	30 MB (shared)
Chip lithography	14 nm	10 nm
Die size	no data	215.25 mm2"
Maximum core temperature	100 °C	100 °C
Maximum case temperature (TCase)	no data	72 °C
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	-	+

Compatibility

Information on Core i5-8257U and Core i9-12900K 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	FCBGA1528	FCLGA1700
Power consumption (TDP)	15 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-8257U and Core i9-12900K. 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	+	+
AVX	+	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
eDRAM	128 MB	no data
Speed Shift	+	+
My WiFi	+	no data
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	+
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	+	no data
SIPP	-	+
Turbo Boost Max 3.0	no data	+
Deep Learning Boost	-	+

Security technologies

Core i5-8257U and Core i9-12900K technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	+
EDB	+	+
Secure Key	+	+
MPX	+	-
Identity Protection	+	-
SGX	Yes with Intel® ME	no data
OS Guard	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i5-8257U and Core i9-12900K are enumerated here.

AMD-V	+	-
VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i5-8257U and Core i9-12900K. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR4, DDR5
Maximum memory size	32 GB	128 GB
Max memory channels	2	2
Maximum memory bandwidth	37.5 GB/s	76.805 GB/s
ECC memory support	-	+

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card Compare	Intel Iris Plus Graphics 645	Intel UHD Graphics 770
Max video memory	32 GB	no data
Quick Sync Video	+	+
Clear Video	+	no data
Clear Video HD	+	+
Graphics max frequency	1.05 GHz	1.55 GHz
Execution Units	no data	32
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i5-8257U and Core i9-12900K integrated GPUs.

Number of displays supported	3	4
eDP	+	no data
DisplayPort	+	-
HDMI	+	-
DVI	+	no data

Graphics image quality

Maximum display resolutions supported by Core i5-8257U and Core i9-12900K integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2304@30Hz	4096 x 2160 @ 60Hz
Max resolution over eDP	4096x2304@60Hz	5120 x 3200 @ 120Hz
Max resolution over DisplayPort	4096x2304@60Hz	7680 x 4320 @ 60Hz

Graphics API support

APIs supported by Core i5-8257U and Core i9-12900K integrated GPUs, sometimes API versions are included.

DirectX	12	12
OpenGL	4.5	4.5

Peripherals

Specifications and connection of peripherals supported by Core i5-8257U and Core i9-12900K.

PCIe version	3.0	5.0 and 4.0
PCI Express lanes	16	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	4.70	26.09
Integrated graphics card	4.45	6.16
Recency	10 July 2019	4 November 2021
Physical cores	4	16
Threads	8	24
Chip lithography	14 nm	10 nm
Power consumption (TDP)	15 Watt	125 Watt

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Should you still have questions on choice between Core i5-8257U and Core i9-12900K, ask them in Comments section, and we shall answer.

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