Athlon II X4 651K vs Core 2 Duo E8400

Primary details

Comparing Core 2 Duo E8400 and Athlon II X4 651K processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	2636	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Architecture codename	Wolfdale (2008−2010)	Llano (2011−2012)
Release date	1 January 2008 (16 years ago)	14 November 2011 (12 years ago)

Detailed specifications

Core 2 Duo E8400 and Athlon II X4 651K 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)	4 (Quad-Core)
Threads	2	4
Base clock speed	3 GHz	3 GHz
Boost clock speed	3 GHz	3 GHz
Bus rate	1333 MHz	no data
L1 cache	64 KB (per core)	128 KB (per core)
L2 cache	6 MB (shared)	1 MB (per core)
L3 cache	0 KB	0 KB
Chip lithography	45 nm	32 nm
Die size	104 mm2	228 mm2
Maximum case temperature (TCase)	72 °C	no data
Number of transistors	410 million	1,178 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	0.85V-1.3625V	no data

Compatibility

Information on Core 2 Duo E8400 and Athlon II X4 651K 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	1
Socket	LGA775	FM1
Power consumption (TDP)	65 Watt	100 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Duo E8400 and Athlon II X4 651K. 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
Thermal Monitoring	+	-
Demand Based Switching	-	no data
FSB parity	-	no data
Status	Discontinued	no data

Security technologies

Core 2 Duo E8400 and Athlon II X4 651K 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 Athlon II X4 651K 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 Core 2 Duo E8400 and Athlon II X4 651K. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

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 Athlon II X4 651K.

PCIe version

2.0

no data

Pros & cons summary

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Recency	1 January 2008	14 November 2011
Physical cores	2	4
Threads	2	4
Chip lithography	45 nm	32 nm
Power consumption (TDP)	65 Watt	100 Watt

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