Core 2 Extreme QX9775 vs Core i7-975

Primary details

Comparing Core i7-975 and Core 2 Extreme QX9775 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1830	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.10	no data
Market segment	Desktop processor	Desktop processor
Series	Core i7 (Desktop)	no data
Power efficiency	1.60	no data
Architecture codename	Bloomfield (2008−2010)	Yorkfield (2007−2009)
Release date	2 June 2009 (15 years ago)	March 2008 (16 years ago)
Launch price (MSRP)	$476	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i7-975 and Core 2 Extreme QX9775 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	3.33 GHz	3.2 GHz
Boost clock speed	3.6 GHz	3.2 GHz
Bus rate	1333 MHz	1600 MHz
L1 cache	64 KB (per core)	64K (per core)
L2 cache	256 KB (per core)	12 MB (shared)
L3 cache	8 MB (shared)	0 KB
Chip lithography	45 nm	45 nm
Die size	263 mm2	2x 107 mm2
Maximum case temperature (TCase)	68 °C	63 °C
Number of transistors	731 million	820 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	+
VID voltage range	no data	0.85V-1.35V

Compatibility

Information on Core i7-975 and Core 2 Extreme QX9775 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	FCLGA1366	LGA771
Power consumption (TDP)	130 Watt	150 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-975 and Core 2 Extreme QX9775. You'll probably need this information if you require some particular technology.

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

Security technologies

Core i7-975 and Core 2 Extreme QX9775 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-975 and Core 2 Extreme QX9775 are enumerated here.

VT-x	+	+
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-975 and Core 2 Extreme QX9775. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR2
Maximum memory size	24 GB	no data
Max memory channels	3	no data
Maximum memory bandwidth	25.6 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

no data

Peripherals

Specifications and connection of peripherals supported by Core i7-975 and Core 2 Extreme QX9775.

PCIe version

2.0

no data

Pros & cons summary

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Threads	8	4
Power consumption (TDP)	130 Watt	150 Watt

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Should you still have questions on choice between Core i7-975 and Core 2 Extreme QX9775, ask them in Comments section, and we shall answer.

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