Core 2 Extreme QX9775 vs Core 2 Extreme X7900

Primary details

Comparing Core 2 Extreme X7900 and Core 2 Extreme QX9775 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	2650	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Desktop processor
Series	Intel Core 2 Extreme	no data
Architecture codename	Merom (2006−2008)	Yorkfield (2007−2009)
Release date	1 September 2007 (16 years ago)	March 2008 (16 years ago)
Launch price (MSRP)	$851	no data

Detailed specifications

Core 2 Extreme X7900 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	2 (Dual-core)	4 (Quad-Core)
Threads	2	4
Base clock speed	2.8 GHz	3.2 GHz
Boost clock speed	2.8 GHz	3.2 GHz
Bus rate	800 MHz	no data
L1 cache	128 KB	64K (per core)
L2 cache	4 MB	12 MB (shared)
L3 cache	0 KB	0 KB
Chip lithography	65 nm	45 nm
Die size	143 mm2	2x 107 mm2
Maximum core temperature	100 °C	no data
Maximum case temperature (TCase)	no data	63 °C
Number of transistors	no data	820 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	-	+
VID voltage range	1.1V-1.375V	0.85V-1.35V

Compatibility

Information on Core 2 Extreme X7900 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	PPGA478	LGA771
Power consumption (TDP)	44 Watt	150 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Extreme X7900 and Core 2 Extreme QX9775. You'll probably need this information if you require some particular technology.

Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	-	-
Hyper-Threading Technology	-	-
Idle States	-	+
Thermal Monitoring	-	+
Demand Based Switching	-	-
AMT	+	no data
FSB parity	-	-
Status	Discontinued	Discontinued

Security technologies

Core 2 Extreme X7900 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 2 Extreme X7900 and Core 2 Extreme QX9775 are enumerated here.

VT-x

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Extreme X7900 and Core 2 Extreme QX9775. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1

DDR2

Pros & cons summary

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Physical cores	2	4
Threads	2	4
Chip lithography	65 nm	45 nm
Power consumption (TDP)	44 Watt	150 Watt

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Should you still have questions on choice between Core 2 Extreme X7900 and Core 2 Extreme QX9775, ask them in Comments section, and we shall answer.

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