Core 2 Quad Q8400 vs Phenom II X3 P820
Aggregate performance score
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 ranking | 2740 | 2268 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Desktop processor |
| Series | 3x AMD Phenom II | no data |
| Power efficiency | 2.50 | 1.30 |
| Architecture codename | Champlain (2010−2011) | Yorkfield (2007−2009) |
| Release date | 12 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 cores | 3 (Tri-Core) | 4 (Quad-Core) |
| Threads | 3 | 4 |
| Base clock speed | no data | 2.66 GHz |
| Boost clock speed | 1.8 GHz | 0.67 GHz |
| Bus rate | 3600 MHz | 1333 MHz |
| L1 cache | 384 KB | 64 KB (per core) |
| L2 cache | 1.5 MB | 4 MB (shared) |
| L3 cache | no data | 0 KB |
| Chip lithography | 45 nm | 45 nm |
| Die size | no data | 2x 82 mm2 |
| Maximum case temperature (TCase) | no data | 71 °C |
| Number of transistors | no data | 456 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | no data | 0.85V-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 configuration | no data | 1 |
| Socket | S1 | FCLGA775,LGA775 |
| Power consumption (TDP) | 25 Watt | 95 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 extensions | Virtualization, AMD64, Advanced Virus Protection, SSE(1,2,3,4a) | no data |
| VirusProtect | + | - |
| Enhanced SpeedStep (EIST) | no data | + |
| Turbo Boost Technology | no data | - |
| Hyper-Threading Technology | no data | - |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Demand Based Switching | no data | - |
| FSB parity | no data | - |
Security technologies
Phenom II X3 P820 and Core 2 Quad Q8400 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | - |
| EDB | no 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-x | no 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 types | 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 Phenom II X3 P820 and Core 2 Quad Q8400.
| PCIe version | no data | 2.0 |
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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