Pentium D 820 vs Core 2 Quad Q9400

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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 ranking2140not rated
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation3.51no data
Market segmentDesktop processorDesktop processor
Seriesno dataPentium D
Architecture codenameYorkfield (2007−2009)Smithfield (2005)
Release dateAugust 2008 (15 years ago)May 2005 (19 years ago)
Current price$84 $183

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

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 cores4 (Quad-Core)2 (Dual-core)
Threads42
Base clock speed2.66 GHz2.8 GHz
Boost clock speed2.67 GHz2.8 GHz
Bus supportno data800 MHz
L1 cache64K (per core)28 KB
L2 cache6 MB (shared)2 MB
L3 cache0 KB0 KB
Chip lithography45 nm90 nm
Die size2x 81 mm2206 mm2
Maximum core temperature71 °C64 °C
Maximum case temperature (TCase)71 °Cno data
Number of transistors456 million169 million
64 bit support++
Windows 11 compatibility--
Unlocked multiplierNoNo
VID voltage range0.85V-1.3625V1.2V-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 configuration12
SocketLGA775PLGA775
Power consumption (TDP)95 Watt95 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--
PAEno data32 Bit
FSB parity--
StatusDiscontinuedDiscontinued

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 typesDDR1, DDR2, DDR3DDR1, DDR2, DDR3
ECC memory supportno 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.


Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Benchmark coverage: 68%

Core 2 Quad Q9400 2124
+326%
Pentium D 820 499

Core 2 Quad Q9400 outperforms Pentium D 820 by 326% in Passmark.

Pros & cons summary


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

We couldn't decide between Core 2 Quad Q9400 and Pentium D 820. We've got no test results to judge.


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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Intel Core 2 Quad Q9400
Core 2 Quad Q9400
Intel Pentium D 820
Pentium D 820

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Community ratings

Here you can see how users rate the processors, as well as rate them yourself.


4.3 1501 vote

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3.2 165 votes

Rate Pentium D 820 on a scale of 1 to 5:

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Questions & comments

Here you can ask a question about Core 2 Quad Q9400 or Pentium D 820, agree or disagree with our judgements, or report an error or mismatch.