Pentium 4 660 vs Pentium D 840

Primary details

Comparing Pentium D 840 and Pentium 4 660 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	3210
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Series	no data	Pentium 4
Power efficiency	no data	0.17
Architecture codename	Smithfield (2005)	Prescott 2M
Release date	May 2005 (19 years ago)	no data

Detailed specifications

Pentium D 840 and Pentium 4 660 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	1
Base clock speed	3.2 GHz	3.6 GHz
Boost clock speed	3.2 GHz	3.6 GHz
Bus rate	no data	800 MHz
L1 cache	28 KB	no data
L2 cache	2 MB	no data
L3 cache	0 KB	2 MB L2 Cache
Chip lithography	90 nm	90 nm
Die size	206 mm2	no data
Maximum core temperature	70 °C	71 °C
Number of transistors	169 million	no data
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.4V	1.2V-1.4V

Compatibility

Information on Pentium D 840 and Pentium 4 660 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	no data
Socket	PLGA775	PLGA775,PPGA775
Power consumption (TDP)	130 Watt	115 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 840 and Pentium 4 660. 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 840 and Pentium 4 660 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Pentium D 840 and Pentium 4 660 are enumerated here.

VT-d	-	no data
VT-x	-	-

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 840 and Pentium 4 660. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

no data

Pros & cons summary

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Physical cores	2	1
Threads	2	1
Power consumption (TDP)	130 Watt	115 Watt

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