Pentium D 820 vs Core 2 Quad Q9400

Primary details

Comparing Core 2 Quad Q9400 and Pentium D 820 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	2143	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	3.51	no data
Market segment	Desktop processor	Desktop processor
Series	no data	Pentium D
Architecture codename	Yorkfield (2007−2009)	Smithfield (2005)
Release date	August 2008 (15 years ago)	May 2005 (19 years ago)
Current price	$84	$183

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core 2 Quad Q9400 and Pentium D 820 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)	2 (Dual-core)
Threads	4	2
Base clock speed	2.66 GHz	2.8 GHz
Boost clock speed	2.67 GHz	2.8 GHz
Bus support	no data	800 MHz
L1 cache	64K (per core)	28 KB
L2 cache	6 MB (shared)	2 MB
L3 cache	0 KB	0 KB
Chip lithography	45 nm	90 nm
Die size	2x 81 mm2	206 mm2
Maximum core temperature	71 °C	64 °C
Maximum case temperature (TCase)	71 °C	no data
Number of transistors	456 million	169 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	No	No
VID voltage range	0.85V-1.3625V	1.2V-1.4V

Compatibility

Information on Core 2 Quad Q9400 and Pentium D 820 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	2
Socket	LGA775	PLGA775
Power consumption (TDP)	95 Watt	95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Quad Q9400 and Pentium D 820. You'll probably need this information if you require some particular technology.

AES-NI	-	-
Enhanced SpeedStep (EIST)	+	-
Turbo Boost Technology	-	-
Hyper-Threading Technology	-	-
Idle States	+	+
Thermal Monitoring	+	-
Demand Based Switching	-	-
PAE	no data	32 Bit
FSB parity	-	-
Status	Discontinued	Discontinued

Security technologies

Core 2 Quad Q9400 and Pentium D 820 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 Pentium D 820 are enumerated here.

VT-d	+	-
VT-x	+	-

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q9400 and Pentium D 820. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR1, DDR2, DDR3
ECC memory support	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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Pros & cons summary

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Physical cores	4	2
Threads	4	2
Chip lithography	45 nm	90 nm

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Should you still have questions on choice between Core 2 Quad Q9400 and Pentium D 820, ask them in Comments section, and we shall answer.

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