Phenom X4 9850B vs Athlon II X4 638

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Aggregate performance score

Athlon II X4 638
2012
4 cores / 4 threads, 65 Watt
1.47
+15.7%

Athlon II X4 638 outperforms Phenom X4 9850B by a moderate 16% based on our aggregate benchmark results.

Primary details

Comparing Athlon II X4 638 and Phenom X4 9850B processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking21862307
Place by popularitynot in top-100not in top-100
Market segmentDesktop processorDesktop processor
Power efficiency2.061.22
Architecture codenameLlano (2011−2012)Agena (2007−2008)
Release date6 February 2012 (12 years ago)August 2008 (16 years ago)

Detailed specifications

Athlon II X4 638 and Phenom X4 9850B 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 GHzno data
Boost clock speed2.7 GHz2.5 GHz
L1 cache128 KB (per core)128 KB (per core)
L2 cache1 MB (per core)512 KB (per core)
L3 cache0 KB2 MB (shared)
Chip lithography32 nm65 nm
Die size228 mm2285 mm2
Number of transistors1,178 million450 million
64 bit support++
Windows 11 compatibility--

Compatibility

Information on Athlon II X4 638 and Phenom X4 9850B 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
SocketFM1AM2+
Power consumption (TDP)65 Watt95 Watt

Virtualization technologies

Virtual machine speed-up technologies supported by Athlon II X4 638 and Phenom X4 9850B are enumerated here.

AMD-V++

Memory specs

Types, maximum amount and channel quantity of RAM supported by Athlon II X4 638 and Phenom X4 9850B. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3no 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.


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 1.47
+15.7%
Phenom X4 9850B 1.27

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
+15.6%
Phenom X4 9850B 1946

Gaming performance

Pros & cons summary


Performance score 1.47 1.27
Chip lithography 32 nm 65 nm
Power consumption (TDP) 65 Watt 95 Watt

Athlon II X4 638 has a 15.7% higher aggregate performance score, a 103.1% more advanced lithography process, and 46.2% lower power consumption.

The Athlon II X4 638 is our recommended choice as it beats the Phenom X4 9850B in performance tests.


Should you still have questions on choice between Athlon II X4 638 and Phenom X4 9850B, ask them in Comments section, and we shall answer.

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AMD Athlon II X4 638
Athlon II X4 638
AMD Phenom X4 9850B
Phenom X4 9850B

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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3.5 22 votes

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Questions & comments

Here you can ask a question about Athlon II X4 638 or Phenom X4 9850B, agree or disagree with our judgements, or report an error or mismatch.