Core 2 Quad Q8400s vs Core 2 Quad Q9400

Primary details

Comparing Core 2 Quad Q9400 and Core 2 Quad Q8400s processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	2235	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Power efficiency	1.33	no data
Architecture codename	Yorkfield (2007−2009)	Yorkfield (2007−2009)
Release date	August 2008 (16 years ago)	19 April 2009 (15 years ago)

Detailed specifications

Core 2 Quad Q9400 and Core 2 Quad Q8400s 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	4	4
Base clock speed	2.66 GHz	2.66 GHz
Boost clock speed	2.67 GHz	0.67 GHz
Bus rate	1333 MHz	1333 MHz
L1 cache	64K (per core)	64 KB (per core)
L2 cache	6 MB (shared)	4 MB (shared)
L3 cache	0 KB	0 KB
Chip lithography	45 nm	45 nm
Die size	2x 81 mm2	2x 82 mm2
Maximum case temperature (TCase)	71 °C	76 °C
Number of transistors	456 million	456 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	0.85V-1.3625V	0.85V-1.3625V

Compatibility

Information on Core 2 Quad Q9400 and Core 2 Quad Q8400s 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	LGA775	FCLGA775,LGA775
Power consumption (TDP)	95 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Quad Q9400 and Core 2 Quad Q8400s. 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	-	-
FSB parity	-	no data

Security technologies

Core 2 Quad Q9400 and Core 2 Quad Q8400s technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Quad Q9400 and Core 2 Quad Q8400s are enumerated here.

VT-d	+	no data
VT-x	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q9400 and Core 2 Quad Q8400s. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR1, DDR2, DDR3

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

On certain motherboards (Chipset feature)

Peripherals

Specifications and connection of peripherals supported by Core 2 Quad Q9400 and Core 2 Quad Q8400s.

PCIe version

no data

2.0

Pros & cons summary

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Power consumption (TDP)

95 Watt

65 Watt

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Should you still have questions on choice between Core 2 Quad Q9400 and Core 2 Quad Q8400s, ask them in Comments section, and we shall answer.

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