Xeon W-11855M vs i9-11900K

Primary details

Comparing Core i9-11900K and Xeon W-11855M processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	419	680
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	18.18	no data
Market segment	Desktop processor	Server
Series	no data	Intel Tiger Lake
Power efficiency	12.02	30.89
Architecture codename	Rocket Lake (2021)	Tiger Lake-H (2021)
Release date	16 March 2021 (3 years ago)	11 May 2021 (3 years ago)
Launch price (MSRP)	$539	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i9-11900K and Xeon W-11855M 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	8 (Octa-Core)	6 (Hexa-Core)
Threads	16	12
Base clock speed	3.5 GHz	3.2 GHz
Boost clock speed	5.2 GHz	4.9 GHz
Bus rate	8 GT/s	8 GT/s
L1 cache	80 KB (per core)	96K (per core)
L2 cache	512 KB (per core)	1.25 MB (per core)
L3 cache	16 MB (shared)	18 MB (shared)
Chip lithography	14 nm	10 nm SuperFin
Die size	276 mm2	no data
Maximum core temperature	100 °C	100 °C
Maximum case temperature (TCase)	72 °C	72 °C
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	+	-

Compatibility

Information on Core i9-11900K and Xeon W-11855M 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	FCLGA1200	FCBGA1787
Power consumption (TDP)	125 Watt	35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-11900K and Xeon W-11855M. 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, Intel® AVX-512
AES-NI	+	+
FMA	-	+
AVX	+	+
vPro	+	+
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	+
SIPP	+	+
Turbo Boost Max 3.0	+	+
Deep Learning Boost	+	+

Security technologies

Core i9-11900K and Xeon W-11855M technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	no data
Secure Key	+	+
Identity Protection	+	-
SGX	-	-
OS Guard	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-11900K and Xeon W-11855M are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-11900K and Xeon W-11855M. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR4
Maximum memory size	128 GB	128 GB
Max memory channels	2	2
Maximum memory bandwidth	50 GB/s	51.2 GB/s
ECC memory support	-	+

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel UHD Graphics 750	Intel® UHD Graphics for 11th Gen Intel® Processors
Max video memory	64 GB	no data
Quick Sync Video	+	+
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	1.3 GHz	1.45 GHz
Execution Units	32	32
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i9-11900K and Xeon W-11855M integrated GPUs.

Number of displays supported

3

4

Graphics image quality

Maximum display resolutions supported by Core i9-11900K and Xeon W-11855M integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2160@60Hz	4096x2304@60Hz
Max resolution over eDP	5120 x 3200 @60Hz	4096x2304@60Hz
Max resolution over DisplayPort	5120 x 3200 @60Hz	7680x4320@60Hz

Graphics API support

APIs supported by Core i9-11900K and Xeon W-11855M integrated GPUs, sometimes API versions are included.

DirectX	12.1	12.1
OpenGL	4.5	4.6

Peripherals

Specifications and connection of peripherals supported by Core i9-11900K and Xeon W-11855M.

PCIe version	4.0	4.0
PCI Express lanes	20	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	16.18	11.64
Recency	16 March 2021	11 May 2021
Physical cores	8	6
Threads	16	12
Chip lithography	14 nm	10 nm
Power consumption (TDP)	125 Watt	35 Watt

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Should you still have questions on choice between Core i9-11900K and Xeon W-11855M, ask them in Comments section, and we shall answer.

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