A6-6400B vs Phenom II X4 840

Primary details

Comparing Phenom II X4 840 and A6-6400B processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	2030	2340
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	3.08	no data
Market segment	Desktop processor	Desktop processor
Architecture codename	Propus (2009−2011)	Richland (2013−2014)
Release date	4 January 2011 (13 years ago)	1 June 2013 (11 years ago)
Launch price (MSRP)	$90	no data
Current price	$40 (0.4x MSRP)	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Phenom II X4 840 and A6-6400B 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	4 (Quad-Core)	2 (Dual-core)
Threads	4	2
Base clock speed	3.2 GHz	3.9 GHz
Boost clock speed	3.2 GHz	4.1 GHz
L1 cache	128 KB (per core)	96K
L2 cache	512 KB (per core)	1 MB (shared)
L3 cache	0 KB	no data
Chip lithography	45 nm	32 nm
Die size	169 mm2	246 mm2
Maximum case temperature (TCase)	no data	70 °C
Number of transistors	300 million	1,303 million
64 bit support	+	+
Windows 11 compatibility	-	no data
Unlocked multiplier	No	Yes

Compatibility

Information on Phenom II X4 840 and A6-6400B 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	FM2
Power consumption (TDP)	95 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Phenom II X4 840 and A6-6400B. You'll probably need this information if you require some particular technology.

AES-NI	no data	+
FMA	no data	+
AVX	no data	+
PowerNow	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Phenom II X4 840 and A6-6400B are enumerated here.

AMD-V

no data

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Phenom II X4 840 and A6-6400B. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR3

DDR3-1866

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

AMD Radeon HD 8470D

Peripherals

Specifications and connection of peripherals supported by Phenom II X4 840 and A6-6400B.

PCIe version

2.0

2.0

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.

Phenom II X4 840 outperforms A6-6400B by 49% based on our aggregate benchmark results.

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Pros & cons summary

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Performance score	1.55	1.04
Recency	4 January 2011	1 June 2013
Physical cores	4	2
Threads	4	2
Chip lithography	45 nm	32 nm
Power consumption (TDP)	95 Watt	65 Watt

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Should you still have questions on choice between Phenom II X4 840 and A6-6400B, ask them in Comments section, and we shall answer.

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