Athlon II X4 640 vs Athlon II X4 638

VS

Aggregate performance score

Athlon II X4 638
2012
4 cores / 4 threads, 65 Watt
1.42
+0.7%
Athlon II X4 640
2010
4 cores / 4 threads, 95 Watt
1.41

Athlon II X4 638 outperforms Athlon II X4 640 by a minimal 1% based on our aggregate benchmark results.

Primary details

Comparing Athlon II X4 638 and Athlon II X4 640 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking22102214
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluationno data2.92
Market segmentDesktop processorDesktop processor
Power efficiency2.071.40
Architecture codenameLlano (2011−2012)Propus (2009−2011)
Release date6 February 2012 (12 years ago)11 May 2010 (14 years ago)
Launch price (MSRP)no data$80

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

Detailed specifications

Athlon II X4 638 and Athlon II X4 640 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 cores4 (Quad-Core)4 (Quad-Core)
Threads44
Base clock speed2.7 GHz3 GHz
Boost clock speed2.7 GHz3 GHz
L1 cache128 KB (per core)128 KB (per core)
L2 cache1 MB (per core)512 KB (per core)
L3 cache0 KB0 KB
Chip lithography32 nm45 nm
Die size228 mm2169 mm2
Number of transistors1,178 million300 million
64 bit support++
Windows 11 compatibility--

Compatibility

Information on Athlon II X4 638 and Athlon II X4 640 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 configuration11
SocketFM1AM3
Power consumption (TDP)65 Watt95 Watt

Virtualization technologies

Virtual machine speed-up technologies supported by Athlon II X4 638 and Athlon II X4 640 are enumerated here.

AMD-V+-

Memory specs

Types, maximum amount and channel quantity of RAM supported by Athlon II X4 638 and Athlon II X4 640. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3DDR3

Peripherals

Specifications and connection of peripherals supported by Athlon II X4 638 and Athlon II X4 640.

PCIe versionno data2.0

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


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.

Athlon II X4 638 1.42
+0.7%
Athlon II X4 640 1.41

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Athlon II X4 638 2250
+0.2%
Athlon II X4 640 2245

Gaming performance

Pros & cons summary


Performance score 1.42 1.41
Recency 6 February 2012 11 May 2010
Chip lithography 32 nm 45 nm
Power consumption (TDP) 65 Watt 95 Watt

Athlon II X4 638 has a 0.7% higher aggregate performance score, an age advantage of 1 year, a 40.6% more advanced lithography process, and 46.2% lower power consumption.

Given the minimal performance differences, no clear winner can be declared between Athlon II X4 638 and Athlon II X4 640.


Should you still have questions on choice between Athlon II X4 638 and Athlon II X4 640, ask them in Comments section, and we shall answer.

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AMD Athlon II X4 638
Athlon II X4 638
AMD Athlon II X4 640
Athlon II X4 640

Similar processor comparisons

We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.

Community ratings

Here you can see how users rate the processors, as well as rate them yourself.


3.1 34 votes

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Questions & comments

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