Athlon II X4 638 vs Core i7-940XM

Primary details

Comparing Core i7-940XM and Athlon II X4 638 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	2110	2080
Place by popularity	not in top-100	99
Cost-effectiveness evaluation	no data	2.05
Market segment	Laptop	Desktop processor
Series	Intel Core i7	no data
Architecture codename	Clarksfield (2009−2010)	Llano (2011−2012)
Release date	20 June 2010 (13 years ago)	6 February 2012 (12 years ago)
Launch price (MSRP)	$1,096	no data
Current price	$200 (0.2x MSRP)	$27

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i7-940XM and Athlon II X4 638 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	8	4
Base clock speed	2.13 GHz	2.7 GHz
Boost clock speed	3.33 GHz	2.7 GHz
Bus support	2500 MHz	no data
L1 cache	64 KB (per core)	128 KB (per core)
L2 cache	256 KB (per core)	1 MB (per core)
L3 cache	8 MB (shared)	0 KB
Chip lithography	45 nm	32 nm
Die size	296 mm2	228 mm2
Maximum core temperature	100 °C	no data
Number of transistors	774 million	1,178 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	Yes	No

Compatibility

Information on Core i7-940XM and Athlon II X4 638 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	FCPGA988,PGA988	FM1
Power consumption (TDP)	55 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-940XM and Athlon II X4 638. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	no data
AES-NI	-	no data
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	+	no data
Hyper-Threading Technology	+	no data
Idle States	+	no data
Thermal Monitoring	+	no data
Demand Based Switching	-	no data
PAE	36 Bit	no data
Status	Discontinued	no data

Security technologies

Core i7-940XM and Athlon II X4 638 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	no data
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-940XM and Athlon II X4 638 are enumerated here.

AMD-V	no data	+
VT-d	+	no data
VT-x	+	no data
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-940XM and Athlon II X4 638. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3-1066, DDR3-1333	DDR3
Maximum memory size	8 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	21 GB/s	no data
ECC memory support	-	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

None

no data

Peripherals

Specifications and connection of peripherals supported by Core i7-940XM and Athlon II X4 638.

PCIe version	2	no data
PCI Express lanes	16	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.

Athlon II X4 638 outperforms Core i7-940XM by 3% based on our aggregated benchmark results.

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Pros & cons summary

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Performance score	1.41	1.45
Recency	20 June 2010	6 February 2012
Threads	8	4
Chip lithography	45 nm	32 nm
Power consumption (TDP)	55 Watt	65 Watt

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Should you still have questions on choice between Core i7-940XM and Athlon II X4 638, ask them in Comments section, and we shall answer.

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