Ultra 9 285K vs i5-8400

Primary details

Comparing Core i5-8400 and Core Ultra 9 285K processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1129	54
Place by popularity	63	not in top-100
Cost-effectiveness evaluation	4.91	74.27
Market segment	Desktop processor	Desktop processor
Series	Intel Core i5	no data
Power efficiency	8.46	32.56
Architecture codename	Coffee Lake-S (2017−2018)	Arrow Lake-S (2024−2025)
Release date	5 October 2017 (7 years ago)	24 October 2024 (less than a year ago)
Launch price (MSRP)	$182	$589

Cost-effectiveness evaluation

Performance per price, higher is better.

Ultra 9 285K has 1413% better value for money than i5-8400.

Detailed specifications

Core i5-8400 and Core Ultra 9 285K 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	6 (Hexa-Core)	24 (Tetracosa-Core)
Performance-cores	no data	8
Efficient-cores	no data	16
Threads	6	24
Base clock speed	2.8 GHz	3.7 GHz
Boost clock speed	4 GHz	5.6 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	250 MHz
Multiplier	28	no data
L1 cache	64K (per core)	112 KB (per core)
L2 cache	256K (per core)	3 MB (per core)
L3 cache	9 MB (shared)	36 MB (shared)
Chip lithography	14 nm	3 nm
Die size	149 mm2	243 mm2
Maximum core temperature	100 °C	no data
Maximum case temperature (TCase)	72 °C	no data
Number of transistors	no data	17,800 million
64 bit support	+	+
Windows 11 compatibility	+	no data
Unlocked multiplier	-	+

Compatibility

Information on Core i5-8400 and Core Ultra 9 285K 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 (Uniprocessor)	1
Socket	FCLGA1151	FCLGA1851
Power consumption (TDP)	65 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-8400 and Core Ultra 9 285K. 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	+	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	-	no data
TSX	-	+
Idle States	+	+
Thermal Monitoring	+	+
SIPP	-	+
Turbo Boost Max 3.0	no data	+
Deep Learning Boost	-	+
Supported AI Software Frameworks	-	OpenVINO™, WindowsML, DirectML, ONNX RT, WebNN

Security technologies

Core i5-8400 and Core Ultra 9 285K 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 i5-8400 and Core Ultra 9 285K are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i5-8400 and Core Ultra 9 285K. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3, DDR4	DDR5-6400
Maximum memory size	128 GB	192 GB
Max memory channels	2	2
Maximum memory bandwidth	42.671 GB/s	no data
ECC memory support	-	+

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel UHD Graphics 630	Intel® Graphics
Max video memory	64 GB	no data
Quick Sync Video	+	+
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	1.05 GHz	2 GHz
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i5-8400 and Core Ultra 9 285K integrated GPUs.

Number of displays supported

3

4

Graphics image quality

Maximum display resolutions supported by Core i5-8400 and Core Ultra 9 285K integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2304@24Hz	4K @ 60Hz (HDMI 2.1 TMDS) 8K @ 60Hz (HDMI2.1 FRL)
Max resolution over eDP	4096x2304@60Hz	4K @ 60Hz
Max resolution over DisplayPort	4096x2304@60Hz	8K @ 60Hz

Graphics API support

APIs supported by Core i5-8400 and Core Ultra 9 285K integrated GPUs, sometimes API versions are included.

DirectX	12	12
OpenGL	4.5	4.5

Peripherals

Specifications and connection of peripherals supported by Core i5-8400 and Core Ultra 9 285K.

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	5.81	43.00
Recency	5 October 2017	24 October 2024
Physical cores	6	24
Threads	6	24
Chip lithography	14 nm	3 nm
Power consumption (TDP)	65 Watt	125 Watt

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Should you still have questions on choice between Core i5-8400 and Core Ultra 9 285K, ask them in Comments section, and we shall answer.

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