i7-975 Extreme Edition vs i7-990X

Primary details

Comparing Core i7-990X and Core i7-975 Extreme Edition processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1320	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.23	no data
Market segment	Desktop processor	Desktop processor
Series	no data	Intel Core i7EE
Power efficiency	3.28	no data
Architecture codename	Gulftown (2010−2011)	Nehalem (2008−2010)
Release date	24 February 2011 (13 years ago)	2 June 2009 (15 years ago)
Launch price (MSRP)	$1,104	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i7-990X and Core i7-975 Extreme Edition 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	6 (Hexa-Core)	4 (Quad-Core)
Threads	12	8
Base clock speed	3.46 GHz	no data
Boost clock speed	3.73 GHz	3.33 GHz
Bus type	no data	QPI
Bus rate	6.4 GT/s	6.4 GT/s
Multiplier	no data	25
L1 cache	64 KB (per core)	no data
L2 cache	256 KB (per core)	1 MB
L3 cache	12 MB (shared)	8 MB
Chip lithography	32 nm	45 nm
Die size	239 mm2	263 mm2
Maximum core temperature	68 °C	no data
Number of transistors	1,170 million	731 Million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	-

Compatibility

Information on Core i7-990X and Core i7-975 Extreme Edition 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 (Uniprocessor)
Socket	FCLGA1366,LGA1366	no data
Power consumption (TDP)	130 Watt	130 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-990X and Core i7-975 Extreme Edition. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	no data
AES-NI	+	-
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	1.0	no data
Hyper-Threading Technology	+	no data
Idle States	+	no data
Demand Based Switching	-	no data
PAE	36 Bit	no data

Security technologies

Core i7-990X and Core i7-975 Extreme Edition 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 i7-990X and Core i7-975 Extreme Edition are enumerated here.

VT-x	+	no data
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-990X and Core i7-975 Extreme Edition. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	no data
Maximum memory size	24 GB	24 GB
Max memory channels	3	no data
Maximum memory bandwidth	25.6 GB/s	no data

Peripherals

Specifications and connection of peripherals supported by Core i7-990X and Core i7-975 Extreme Edition.

PCIe version

2.0

no data

Pros & cons summary

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Recency	24 February 2011	2 June 2009
Physical cores	6	4
Threads	12	8
Chip lithography	32 nm	45 nm

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Should you still have questions on choice between Core i7-990X and Core i7-975 Extreme Edition, ask them in Comments section, and we shall answer.

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