Core 2 Quad Q8400 vs Phenom II X3 P820

Aggregate performance score

Phenom II X3 P820
2010
3 cores / 3 threads, 25 Watt
0.66
Core 2 Quad Q8400
2009
4 cores / 4 threads, 95 Watt
1.30
+97%

Core 2 Quad Q8400 outperforms Phenom II X3 P820 by an impressive 97% based on our aggregate benchmark results.

Primary details

Comparing Phenom II X3 P820 and Core 2 Quad Q8400 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking27402268
Place by popularitynot in top-100not in top-100
Market segmentLaptopDesktop processor
Series3x AMD Phenom IIno data
Power efficiency2.501.30
Architecture codenameChamplain (2010−2011)Yorkfield (2007−2009)
Release date12 May 2010 (14 years ago)19 April 2009 (15 years ago)

Detailed specifications

Phenom II X3 P820 and Core 2 Quad Q8400 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 cores3 (Tri-Core)4 (Quad-Core)
Threads34
Base clock speedno data2.66 GHz
Boost clock speed1.8 GHz0.67 GHz
Bus rate3600 MHz1333 MHz
L1 cache384 KB64 KB (per core)
L2 cache1.5 MB4 MB (shared)
L3 cacheno data0 KB
Chip lithography45 nm45 nm
Die sizeno data2x 82 mm2
Maximum case temperature (TCase)no data71 °C
Number of transistorsno data456 million
64 bit support++
Windows 11 compatibility--
VID voltage rangeno data0.85V-1.3625V

Compatibility

Information on Phenom II X3 P820 and Core 2 Quad Q8400 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 configurationno data1
SocketS1FCLGA775,LGA775
Power consumption (TDP)25 Watt95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Phenom II X3 P820 and Core 2 Quad Q8400. You'll probably need this information if you require some particular technology.

Instruction set extensionsVirtualization, AMD64, Advanced Virus Protection, SSE(1,2,3,4a)no data
VirusProtect+-
Enhanced SpeedStep (EIST)no data+
Turbo Boost Technologyno data-
Hyper-Threading Technologyno data-
Idle Statesno data+
Thermal Monitoring-+
Demand Based Switchingno data-
FSB parityno data-

Security technologies

Phenom II X3 P820 and Core 2 Quad Q8400 technologies aimed at improving security, for example, by protecting against hacks.

TXTno data-
EDBno data+

Virtualization technologies

Virtual machine speed-up technologies supported by Phenom II X3 P820 and Core 2 Quad Q8400 are enumerated here.

AMD-V+-
VT-xno data+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Phenom II X3 P820 and Core 2 Quad Q8400. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3DDR1, DDR2, DDR3

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardno dataOn certain motherboards (Chipset feature)

Peripherals

Specifications and connection of peripherals supported by Phenom II X3 P820 and Core 2 Quad Q8400.

PCIe versionno data2.0

Gaming performance

Pros & cons summary


Performance score 0.66 1.30
Recency 12 May 2010 19 April 2009
Physical cores 3 4
Threads 3 4
Power consumption (TDP) 25 Watt 95 Watt

Phenom II X3 P820 has an age advantage of 1 year, and 280% lower power consumption.

Core 2 Quad Q8400, on the other hand, has a 97% higher aggregate performance score, and 33.3% more physical cores and 33.3% more threads.

The Core 2 Quad Q8400 is our recommended choice as it beats the Phenom II X3 P820 in performance tests.

Be aware that Phenom II X3 P820 is a notebook processor while Core 2 Quad Q8400 is a desktop one.


Should you still have questions on choice between Phenom II X3 P820 and Core 2 Quad Q8400, ask them in Comments section, and we shall answer.

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AMD Phenom II X3 P820
Phenom II X3 P820
Intel Core 2 Quad Q8400
Core 2 Quad Q8400

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Questions & comments

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