EPYC 9555 vs Pentium D 820

Primary details

Comparing Pentium D 820 and EPYC 9555 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	3095	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Server
Series	Pentium D	no data
Power efficiency	0.31	no data
Architecture codename	Smithfield (2005)	Turin (2024)
Release date	May 2005 (19 years ago)	10 October 2024 (less than a year ago)
Launch price (MSRP)	no data	$9,826

Detailed specifications

Pentium D 820 and EPYC 9555 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)	64 (Tetrahexaconta-Core)
Threads	2	128
Base clock speed	2.8 GHz	3.2 GHz
Boost clock speed	2.8 GHz	4.4 GHz
Bus rate	800 MHz	no data
L1 cache	28 KB	80 KB (per core)
L2 cache	2 MB	1 MB (per core)
L3 cache	0 KB	256 MB (shared)
Chip lithography	90 nm	4 nm
Die size	206 mm2	8x 70.6 mm2
Maximum core temperature	64 °C	no data
Number of transistors	169 million	66,520 million
64 bit support	+	+
Windows 11 compatibility	-	no data
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 820 and EPYC 9555 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	SP5
Power consumption (TDP)	95 Watt	360 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 820 and EPYC 9555. 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
Precision Boost 2	no data	+

Security technologies

Pentium D 820 and EPYC 9555 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 820 and EPYC 9555 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 820 and EPYC 9555. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR5

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 820 and EPYC 9555.

PCIe version	no data	5.0
PCI Express lanes	no data	128

Pros & cons summary

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Physical cores	2	64
Threads	2	128
Chip lithography	90 nm	4 nm
Power consumption (TDP)	95 Watt	360 Watt

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Should you still have questions on choice between Pentium D 820 and EPYC 9555, ask them in Comments section, and we shall answer.

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