Athlon II X4 641 vs Athlon II X2 255

Primary details

Comparing Athlon II X2 255 and Athlon II X4 641 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	2664	2167
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.02	no data
Market segment	Desktop processor	Desktop processor
Power efficiency	1.08	1.38
Architecture codename	Regor (2009−2013)	Llano (2011−2012)
Release date	25 January 2010 (14 years ago)	6 February 2012 (12 years ago)
Launch price (MSRP)	$60	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Athlon II X2 255 and Athlon II X4 641 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	3.1 GHz	2.8 GHz
Boost clock speed	3.1 GHz	2.8 GHz
L1 cache	128 KB	128 KB (per core)
L2 cache	1 MB	1 MB (per core)
L3 cache	0 KB	0 KB
Chip lithography	45 nm	32 nm
Die size	117 mm2	228 mm2
Number of transistors	410 million	1,178 million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Athlon II X2 255 and Athlon II X4 641 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	AM3	FM1
Power consumption (TDP)	65 Watt	100 Watt

Virtualization technologies

Virtual machine speed-up technologies supported by Athlon II X2 255 and Athlon II X4 641 are enumerated here.

AMD-V

-

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Athlon II X2 255 and Athlon II X4 641. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR3

DDR3

Peripherals

Specifications and connection of peripherals supported by Athlon II X2 255 and Athlon II X4 641.

PCIe version

2.0

no data

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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Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

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Pros & cons summary

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Performance score	0.74	1.46
Recency	25 January 2010	6 February 2012
Physical cores	2	4
Threads	2	4
Chip lithography	45 nm	32 nm
Power consumption (TDP)	65 Watt	100 Watt

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Should you still have questions on choice between Athlon II X2 255 and Athlon II X4 641, ask them in Comments section, and we shall answer.

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