Core 2 Duo E6400 vs Pentium D 820

Primary details

Comparing Pentium D 820 and Core 2 Duo E6400 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	2882
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Series	Pentium D	no data
Power efficiency	no data	0.72
Architecture codename	Smithfield (2005)	Conroe (2006−2007)
Release date	May 2005 (19 years ago)	July 2006 (18 years ago)

Detailed specifications

Pentium D 820 and Core 2 Duo E6400 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)	2 (Dual-core)
Threads	2	2
Base clock speed	2.8 GHz	2.13 GHz
Boost clock speed	2.8 GHz	2.13 GHz
Bus rate	800 MHz	1066 MHz
L1 cache	28 KB	64 KB
L2 cache	2 MB	2 MB
L3 cache	0 KB	0 KB
Chip lithography	90 nm	65 nm
Die size	206 mm2	143 mm2
Maximum core temperature	64 °C	61 °C
Number of transistors	169 million	291 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.4V	0.85V-1.5V

Compatibility

Information on Pentium D 820 and Core 2 Duo E6400 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	LGA775,PLGA775
Power consumption (TDP)	95 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 820 and Core 2 Duo E6400. You'll probably need this information if you require some particular technology.

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

Security technologies

Pentium D 820 and Core 2 Duo E6400 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Pentium D 820 and Core 2 Duo E6400 are enumerated here.

VT-d	-	no data
VT-x	-	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 820 and Core 2 Duo E6400. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR1, DDR2, DDR3

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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Pros & cons summary

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Chip lithography	90 nm	65 nm
Power consumption (TDP)	95 Watt	65 Watt

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Should you still have questions on choice between Pentium D 820 and Core 2 Duo E6400, ask them in Comments section, and we shall answer.

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