i9-10900K vs Pentium D 840

Primary details

Comparing Pentium D 840 and Core i9-10900K processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	501
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	15.03
Market segment	Desktop processor	Desktop processor
Power efficiency	no data	10.85
Architecture codename	Smithfield (2005)	Comet Lake (2020)
Release date	May 2005 (19 years ago)	30 April 2020 (4 years ago)
Launch price (MSRP)	no data	$488

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Pentium D 840 and Core i9-10900K 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	2 (Dual-core)	10 (Deca-Core)
Threads	2	20
Base clock speed	3.2 GHz	3.7 GHz
Boost clock speed	3.2 GHz	5.2 GHz
Bus rate	no data	8 GT/s
L1 cache	28 KB	64 KB (per core)
L2 cache	2 MB	256 KB (per core)
L3 cache	0 KB	20 MB (shared)
Chip lithography	90 nm	14 nm
Die size	206 mm2	206 mm2
Maximum core temperature	70 °C	100 °C
Maximum case temperature (TCase)	no data	72 °C
Number of transistors	169 million	no data
64 bit support	+	+
Windows 11 compatibility	-	+
Unlocked multiplier	-	+
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 840 and Core i9-10900K 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	2	1
Socket	PLGA775	FCLGA1200
Power consumption (TDP)	130 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 840 and Core i9-10900K. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	-	+
FMA	-	+
AVX	-	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	-	2.0
Hyper-Threading Technology	-	+
Idle States	+	+
Thermal Monitoring	-	+
SIPP	-	+
Demand Based Switching	-	no data
PAE	32 Bit	no data
Turbo Boost Max 3.0	no data	+
FSB parity	-	no data

Security technologies

Pentium D 840 and Core i9-10900K technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	+
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 Pentium D 840 and Core i9-10900K are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 840 and Core i9-10900K. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR4
Maximum memory size	no data	128 GB
Max memory channels	no data	2
Maximum memory bandwidth	no data	45.8 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	no data	Intel UHD Graphics 630
Max video memory	no data	64 GB
Quick Sync Video	-	+
Clear Video	no data	+
Clear Video HD	no data	+
Graphics max frequency	no data	1.2 GHz
InTru 3D	no data	+

Graphics interfaces

Available interfaces and connections of Pentium D 840 and Core i9-10900K integrated GPUs.

Number of displays supported

no data

3

Graphics image quality

Maximum display resolutions supported by Pentium D 840 and Core i9-10900K integrated GPUs, including resolutions over different interfaces.

4K resolution support	no data	+
Max resolution over HDMI 1.4	no data	4096 x 2160@30Hz
Max resolution over eDP	no data	4096 x 2304@60Hz
Max resolution over DisplayPort	no data	4096 x 2304@60Hz

Graphics API support

APIs supported by Pentium D 840 and Core i9-10900K integrated GPUs, sometimes API versions are included.

DirectX	no data	12
OpenGL	no data	4.5

Peripherals

Specifications and connection of peripherals supported by Pentium D 840 and Core i9-10900K.

PCIe version	no data	3.0
PCI Express lanes	no data	16

Pros & cons summary

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Physical cores	2	10
Threads	2	20
Chip lithography	90 nm	14 nm
Power consumption (TDP)	130 Watt	125 Watt

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Should you still have questions on choice between Pentium D 840 and Core i9-10900K, ask them in Comments section, and we shall answer.

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