EPYC 7643 vs Pentium D 840

Primary details

Comparing Pentium D 840 and EPYC 7643 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	39
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	6.36
Market segment	Desktop processor	Server
Series	no data	AMD EPYC
Power efficiency	no data	20.13
Architecture codename	Smithfield (2005)	Milan (2021−2023)
Release date	May 2005 (19 years ago)	12 January 2021 (3 years ago)
Launch price (MSRP)	no data	$4,995

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Pentium D 840 and EPYC 7643 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)	48 (Octatetraconta-Core)
Threads	2	96
Base clock speed	3.2 GHz	2.3 GHz
Boost clock speed	3.2 GHz	3.6 GHz
Multiplier	no data	23
L1 cache	28 KB	3 MB
L2 cache	2 MB	24 MB
L3 cache	0 KB	256 MB (shared)
Chip lithography	90 nm	7 nm+
Die size	206 mm2	8x 81 mm2
Maximum core temperature	70 °C	no data
Number of transistors	169 million	33,200 million
64 bit support	+	+
Windows 11 compatibility	-	+
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 840 and EPYC 7643 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	2
Socket	PLGA775	SP3
Power consumption (TDP)	130 Watt	225 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 840 and EPYC 7643. You'll probably need this information if you require some particular technology.

AES-NI	-	+
AVX	-	+
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	no data
Idle States	+	no data
Demand Based Switching	-	no data
PAE	32 Bit	no data
FSB parity	-	no data

Security technologies

Pentium D 840 and EPYC 7643 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 Pentium D 840 and EPYC 7643 are enumerated here.

AMD-V	-	+
VT-d	-	no data
VT-x	-	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 840 and EPYC 7643. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR4-3200
Maximum memory size	no data	4 TiB
Maximum memory bandwidth	no data	204.795 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

N/A

Peripherals

Specifications and connection of peripherals supported by Pentium D 840 and EPYC 7643.

PCIe version	no data	4.0
PCI Express lanes	no data	128

Pros & cons summary

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Physical cores	2	48
Threads	2	96
Chip lithography	90 nm	7 nm
Power consumption (TDP)	130 Watt	225 Watt

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