Pentium 4 HT 551 vs Pentium D 820

Primary details

Comparing Pentium D 820 and Pentium 4 HT 551 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	3096	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Series	Pentium D	no data
Power efficiency	0.31	no data
Architecture codename	Smithfield (2005)	Prescott (2001−2005)
Release date	May 2005 (19 years ago)	June 2005 (19 years ago)

Detailed specifications

Pentium D 820 and Pentium 4 HT 551 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)	1 (Single-Core)
Threads	2	2
Base clock speed	2.8 GHz	no data
Boost clock speed	2.8 GHz	3.4 GHz
Bus rate	800 MHz	no data
L1 cache	28 KB	16 KB
L2 cache	2 MB	1 MB
L3 cache	0 KB	0 KB
Chip lithography	90 nm	90 nm
Die size	206 mm2	109 mm2
Maximum core temperature	64 °C	no data
Number of transistors	169 million	125 million
64 bit support	+	-
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 820 and Pentium 4 HT 551 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	775
Power consumption (TDP)	95 Watt	115 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 820 and Pentium 4 HT 551. You'll probably need this information if you require some particular technology.

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 820 and Pentium 4 HT 551 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 Pentium 4 HT 551 are enumerated here.

VT-d	-	no data
VT-x	-	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 820 and Pentium 4 HT 551. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR1, DDR2, DDR3

Pros & cons summary

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Physical cores	2	1
Power consumption (TDP)	95 Watt	115 Watt

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Should you still have questions on choice between Pentium D 820 and Pentium 4 HT 551, ask them in Comments section, and we shall answer.

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