Pentium D 840 EE vs Core 2 Duo E8400

Primary details

Comparing Core 2 Duo E8400 and Pentium D 840 EE processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	2685	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Power efficiency	1.06	no data
Architecture codename	Wolfdale (2008−2010)	Smithfield (2005)
Release date	1 January 2008 (16 years ago)	May 2005 (19 years ago)

Detailed specifications

Core 2 Duo E8400 and Pentium D 840 EE 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	4
Base clock speed	3 GHz	no data
Boost clock speed	3 GHz	3.2 GHz
Bus rate	1333 MHz	no data
L1 cache	64 KB (per core)	28 KB
L2 cache	6 MB (shared)	2 MB
L3 cache	0 KB	0 KB
Chip lithography	45 nm	90 nm
Die size	104 mm2	206 mm2
Maximum case temperature (TCase)	72 °C	no data
Number of transistors	410 million	169 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	0.85V-1.3625V	no data

Compatibility

Information on Core 2 Duo E8400 and Pentium D 840 EE 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	1	2
Socket	LGA775	775
Power consumption (TDP)	65 Watt	130 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Duo E8400 and Pentium D 840 EE. You'll probably need this information if you require some particular technology.

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

Security technologies

Core 2 Duo E8400 and Pentium D 840 EE 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 Core 2 Duo E8400 and Pentium D 840 EE are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Duo E8400 and Pentium D 840 EE. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR1, DDR2, DDR3

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

On certain motherboards (Chipset feature)

no data

Peripherals

Specifications and connection of peripherals supported by Core 2 Duo E8400 and Pentium D 840 EE.

PCIe version

2.0

no data

Pros & cons summary

---

Threads	2	4
Chip lithography	45 nm	90 nm
Power consumption (TDP)	65 Watt	130 Watt

---

Should you still have questions on choice between Core 2 Duo E8400 and Pentium D 840 EE, ask them in Comments section, and we shall answer.

Vote for your favorite

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.

---