Athlon II X4 641 vs Athlon II X4 638

Place in performance ranking	2052	2025
Place by popularity	not in top-100	not in top-100
Value for money	2.05	0.15
Market segment	Desktop processor	Desktop processor
Architecture codename	Llano (2011−2012)	Llano (2011−2012)
Release date	6 February 2012 (12 years old)	6 February 2012 (12 years old)
Current price	$27	$19.92

Value for money

Performance per price, higher is better.

Athlon II X4 638 has 1267% better value for money than Athlon II X4 641.

Technical specs

Athlon II X4 638 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	4 (Quad-Core)	4 (Quad-Core)
Threads	4	4
Base clock speed	2.7 GHz	2.8 GHz
Boost clock speed	2.7 GHz	2.8 GHz
L1 cache	128 KB (per core)	128 KB (per core)
L2 cache	1 MB (per core)	1 MB (per core)
L3 cache	0 KB	0 KB
Chip lithography	32 nm	32 nm
Die size	228 mm²	228 mm²
Number of transistors	1,178 million	1,178 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	No	No

Compatibility

Information on Athlon II X4 638 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	FM1	FM1
Power consumption (TDP)	65 Watt	100 Watt

Virtualization technologies

Virtual machine speed-up technologies supported by Athlon II X4 638 and Athlon II X4 641 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 641. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR3

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

Athlon II X4 641 1.51
+2.7%

Athlon II X4 641 outperforms Athlon II X4 638 by 3% based on our aggregated benchmark results.

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.

Benchmark coverage: 68%

Athlon II X4 638 2250

Athlon II X4 641 2313
+2.8%

Athlon II X4 641 outperforms Athlon II X4 638 by 3% in Passmark.