Athlon II X2 255 vs Pentium D 945

Primary details

Comparing Pentium D 945 and Athlon II X2 255 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	2662
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	0.02
Market segment	Desktop processor	Desktop processor
Power efficiency	no data	1.08
Architecture codename	Presler (2005−2007)	Regor (2009−2013)
Release date	23 July 2006 (18 years ago)	25 January 2010 (14 years ago)
Launch price (MSRP)	$163	$60

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Pentium D 945 and Athlon II X2 255 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	3.4 GHz	3.1 GHz
Boost clock speed	3.4 GHz	3.1 GHz
L1 cache	16 KB (per core)	128 KB
L2 cache	2 MB (per die)	1 MB
L3 cache	0 KB	0 KB
Chip lithography	65 nm	45 nm
Die size	2x 81 mm2	117 mm2
Maximum case temperature (TCase)	63 °C	no data
Number of transistors	376 million	410 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.3375V	no data

Compatibility

Information on Pentium D 945 and Athlon II X2 255 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,PLGA775	AM3
Power consumption (TDP)	95 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 945 and Athlon II X2 255. 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 945 and Athlon II X2 255 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 945 and Athlon II X2 255 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 945 and Athlon II X2 255. 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 Pentium D 945 and Athlon II X2 255.

PCIe version

no data

2.0

Pros & cons summary

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Recency	23 July 2006	25 January 2010
Chip lithography	65 nm	45 nm
Power consumption (TDP)	95 Watt	65 Watt

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