i7-990X vs i7-3940XM

Primary details

Comparing Core i7-3940XM and Core i7-990X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1482	1305
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	0.20
Market segment	Laptop	Desktop processor
Series	Intel Core i7	no data
Power efficiency	6.32	3.28
Architecture codename	Ivy Bridge (2012−2013)	Gulftown (2010−2011)
Release date	3 September 2012 (12 years ago)	24 February 2011 (13 years ago)
Launch price (MSRP)	$1,096	$1,104

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i7-3940XM and Core i7-990X 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)	6 (Hexa-Core)
Threads	8	12
Base clock speed	3 GHz	3.46 GHz
Boost clock speed	3.9 GHz	3.73 GHz
Bus rate	5 GT/s	6.4 GT/s
L1 cache	64K (per core)	64 KB (per core)
L2 cache	256K (per core)	256 KB (per core)
L3 cache	8 MB (shared)	12 MB (shared)
Chip lithography	22 nm	32 nm
Die size	160 mm2	239 mm2
Maximum core temperature	105 °C	68 °C
Number of transistors	1,400 million	1,170 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	+

Compatibility

Information on Core i7-3940XM and Core i7-990X 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	FCLGA1366,LGA1366
Power consumption (TDP)	55 Watt	130 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-3940XM and Core i7-990X. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® AVX	Intel® SSE4.2
AES-NI	+	+
AVX	+	-
Enhanced SpeedStep (EIST)	+	+
My WiFi	+	no data
Turbo Boost Technology	2.0	1.0
Hyper-Threading Technology	+	+
Idle States	+	+
Thermal Monitoring	+	-
Flex Memory Access	+	no data
Demand Based Switching	-	-
PAE	no data	36 Bit
FDI	+	no data
Fast Memory Access	+	no data

Security technologies

Core i7-3940XM and Core i7-990X technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+
Identity Protection	+	-
Anti-Theft	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-3940XM and Core i7-990X are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-3940XM and Core i7-990X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	32 GB	24 GB
Max memory channels	2	3
Maximum memory bandwidth	25.6 GB/s	25.6 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD Graphics 4000	no data
Quick Sync Video	+	-
Clear Video HD	+	no data
Graphics max frequency	1.35 GHz	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i7-3940XM and Core i7-990X integrated GPUs.

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

Peripherals

Specifications and connection of peripherals supported by Core i7-3940XM and Core i7-990X.

PCIe version	3.0	2.0
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.

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Pros & cons summary

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Performance score	3.69	4.53
Recency	3 September 2012	24 February 2011
Physical cores	4	6
Threads	8	12
Chip lithography	22 nm	32 nm
Power consumption (TDP)	55 Watt	130 Watt

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Should you still have questions on choice between Core i7-3940XM and Core i7-990X, ask them in Comments section, and we shall answer.

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