i9-11900KB vs i9-9900X

Place in the ranking	534	496
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	4.90	17.86
Market segment	Desktop processor	Desktop processor
Series	Intel Core i9	no data
Power efficiency	7.89	21.01
Architecture codename	Skylake (server) (2017−2018)	Tiger Lake-H (2021)
Release date	19 October 2018 (6 years ago)	May 2021 (3 years ago)
Launch price (MSRP)	$989	$539

Cost-effectiveness evaluation

Performance per price, higher is better.

i9-11900KB has 264% better value for money than i9-9900X.

Detailed specifications

Core i9-9900X and Core i9-11900KB 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)	8 (Octa-Core)
Threads	20	16
Base clock speed	3.5 GHz	3.3 GHz
Boost clock speed	4.5 GHz	4.9 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	8 GT/s
Multiplier	35	no data
L1 cache	64 KB (per core)	80K (per core)
L2 cache	1 MB (per core)	1.25 MB (per core)
L3 cache	19.25 MB (shared)	24 MB (shared)
Chip lithography	14 nm	10 nm SuperFin
Die size	no data	190 mm²
Maximum core temperature	92 °C	100 °C
Maximum case temperature (TCase)	72 °C	72 °C
64 bit support	+	+
Windows 11 compatibility	+	-
Unlocked multiplier	+	+

Compatibility

Information on Core i9-9900X and Core i9-11900KB 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	FCBGA1787
Power consumption (TDP)	165 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-9900X and Core i9-11900KB. 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	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
AVX	+	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	+
TSX	+	-
Idle States	no data	+
Thermal Monitoring	-	+
Flex Memory Access	no data	+
Turbo Boost Max 3.0	+	+
Deep Learning Boost	-	+

Security technologies

Core i9-9900X and Core i9-11900KB technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-9900X and Core i9-11900KB are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-9900X and Core i9-11900KB. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR4
Maximum memory size	128 GB	128 GB
Max memory channels	4	2
Maximum memory bandwidth	85.33 GB/s	51.2 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	N/A	Intel® UHD Graphics for 11th Gen Intel® Processors
Quick Sync Video	-	+
Graphics max frequency	no data	1.45 GHz
Execution Units	no data	32

Graphics interfaces

Available interfaces and connections of Core i9-9900X and Core i9-11900KB integrated GPUs.

Number of displays supported

no data

Graphics image quality

Maximum display resolutions supported by Core i9-9900X and Core i9-11900KB integrated GPUs, including resolutions over different interfaces.

4K resolution support	no data	+
Max resolution over HDMI 1.4	no data	4096x2304@60Hz
Max resolution over eDP	no data	4096 x 2304@60Hz
Max resolution over DisplayPort	no data	7680x4320@60Hz

Graphics API support

APIs supported by Core i9-9900X and Core i9-11900KB integrated GPUs, sometimes API versions are included.

DirectX	no data	12
OpenGL	no data	4.6

Peripherals

Specifications and connection of peripherals supported by Core i9-9900X and Core i9-11900KB.

PCIe version	3.0	4.0
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.

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.

i9-9900X 13.76

i9-11900KB 14.43
+4.9%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

i9-9900X 21851

i9-11900KB 22917
+4.9%

Gaming performance

Pros & cons summary

Performance score	13.76	14.43
Physical cores	10	8
Threads	20	16
Chip lithography	14 nm	10 nm
Power consumption (TDP)	165 Watt	65 Watt

i9-9900X has 25% more physical cores and 25% more threads.

i9-11900KB, on the other hand, has a 4.9% higher aggregate performance score, a 40% more advanced lithography process, and 153.8% lower power consumption.

Given the minimal performance differences, no clear winner can be declared between Core i9-9900X and Core i9-11900KB.

Should you still have questions on choice between Core i9-9900X and Core i9-11900KB, ask them in Comments section, and we shall answer.