i7-940XM vs i7-6600U

Primary details

Comparing Core i7-6600U and Core i7-940XM processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1845	2213
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Laptop
Series	Intel Core i7	Intel Core i7
Power efficiency	13.62	2.40
Architecture codename	Skylake (2015−2016)	Clarksfield (2009−2010)
Release date	1 September 2015 (9 years ago)	20 June 2010 (14 years ago)
Launch price (MSRP)	$393	$1,096

Detailed specifications

Core i7-6600U and Core i7-940XM 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	2 (Dual-core)	4 (Quad-Core)
Threads	4	8
Base clock speed	2.6 GHz	2.13 GHz
Boost clock speed	3.4 GHz	3.33 GHz
Bus type	OPI	no data
Bus rate	4 GT/s	2500 MHz
Multiplier	26	no data
L1 cache	128 KB	64 KB (per core)
L2 cache	512 KB	256 KB (per core)
L3 cache	4 MB	8 MB (shared)
Chip lithography	14 nm	45 nm
Die size	98.57 mm2	296 mm2
Maximum core temperature	100 °C	100 °C
Number of transistors	1750 Million	774 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	-	+

Compatibility

Information on Core i7-6600U and Core i7-940XM 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 (Uniprocessor)	1
Socket	FCBGA1356	FCPGA988,PGA988
Power consumption (TDP)	15 Watt	55 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-6600U and Core i7-940XM. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2	Intel® SSE4.2
AES-NI	+	-
AVX	+	-
vPro	+	no data
Enhanced SpeedStep (EIST)	+	+
My WiFi	+	no data
Turbo Boost Technology	2.0	+
Hyper-Threading Technology	+	+
TSX	+	-
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	+	no data
SIPP	+	-
Smart Response	+	no data
Demand Based Switching	no data	-
PAE	no data	36 Bit

Security technologies

Core i7-6600U and Core i7-940XM technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	+	no data
MPX	+	-
Identity Protection	+	-
SGX	Yes with Intel® ME	no data
OS Guard	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-6600U and Core i7-940XM are enumerated here.

AMD-V	+	-
VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-6600U and Core i7-940XM. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3, DDR4	DDR3-1066, DDR3-1333
Maximum memory size	32 GB	8 GB
Max memory channels	2	2
Maximum memory bandwidth	34.134 GB/s	21 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD Graphics 520	None
Max video memory	32 GB	no data
Quick Sync Video	+	-
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	1.05 GHz	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i7-6600U and Core i7-940XM integrated GPUs.

Number of displays supported	3	no data
eDP	+	no data
DisplayPort	+	-
HDMI	+	-
DVI	+	no data

Graphics image quality

Maximum display resolutions supported by Core i7-6600U and Core i7-940XM integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2304@24Hz	no data
Max resolution over eDP	4096x2304@60Hz	no data
Max resolution over DisplayPort	4096x2304@60Hz	no data
Max resolution over VGA	N/A	no data

Graphics API support

APIs supported by Core i7-6600U and Core i7-940XM integrated GPUs, sometimes API versions are included.

DirectX	12	no data
OpenGL	4.5	no data

Peripherals

Specifications and connection of peripherals supported by Core i7-6600U and Core i7-940XM.

PCIe version	3.0	2
PCI Express lanes	12	16

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.

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Pros & cons summary

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Performance score	2.20	1.42
Recency	1 September 2015	20 June 2010
Physical cores	2	4
Threads	4	8
Chip lithography	14 nm	45 nm
Power consumption (TDP)	15 Watt	55 Watt

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Should you still have questions on choice between Core i7-6600U and Core i7-940XM, ask them in Comments section, and we shall answer.

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