Ultra 9 285K vs i9-9940X

Primary details

Comparing Core i9-9940X and Core Ultra 9 285K processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	350	53
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	5.09	69.52
Market segment	Desktop processor	Desktop processor
Series	Intel Core i9	no data
Power efficiency	10.10	32.38
Architecture codename	Skylake (server) (2017−2019)	Arrow Lake-S (2024−2025)
Release date	8 October 2018 (6 years ago)	24 October 2024 (recently)
Launch price (MSRP)	$1,387	$589

Cost-effectiveness evaluation

Performance per price, higher is better.

Ultra 9 285K has 1266% better value for money than i9-9940X.

Detailed specifications

Core i9-9940X 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	14 (Tetradeca-Core)	24 (Tetracosa-Core)
Threads	28	24
Base clock speed	3.3 GHz	3.7 GHz
Boost clock speed	4.5 GHz	5.7 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	250 MHz
Multiplier	33	no data
L1 cache	896 KB	112 KB (per core)
L2 cache	14 MB	3 MB (per core)
L3 cache	19.25 MB (shared)	36 MB (shared)
Chip lithography	14 nm	3 nm
Die size	484 mm2	243 mm2
Maximum core temperature	88 °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 i9-9940X 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	FCLGA2066	1851
Power consumption (TDP)	165 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-9940X 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® AVX-512	no data
AES-NI	+	+
AVX	+	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	no data
TSX	+	+
Turbo Boost Max 3.0	+	no data

Security technologies

Core i9-9940X and Core Ultra 9 285K technologies aimed at improving security, for example, by protecting against hacks.

TXT	no data	+
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-9940X and Core Ultra 9 285K are enumerated here.

VT-d	+	+
VT-x	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-9940X and Core Ultra 9 285K. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR5 Depends on motherboard
Maximum memory size	128 GB	no data
Max memory channels	4	no data
Maximum memory bandwidth	85.33 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

Arc Xe-LPG Graphics 64EU

Peripherals

Specifications and connection of peripherals supported by Core i9-9940X and Core Ultra 9 285K.

PCIe version	3.0	5.0
PCI Express lanes	44	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	17.95	43.58
Recency	8 October 2018	24 October 2024
Physical cores	14	24
Threads	28	24
Chip lithography	14 nm	3 nm
Power consumption (TDP)	165 Watt	125 Watt

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Should you still have questions on choice between Core i9-9940X and Core Ultra 9 285K, ask them in Comments section, and we shall answer.

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