Pentium D 820 vs Phenom II X4 955 BE
Primary details
Comparing Phenom II X4 955 BE and Pentium D 820 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | 3101 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Desktop processor |
| Series | no data | Pentium D |
| Power efficiency | no data | 0.31 |
| Architecture codename | Deneb (2009−2011) | Smithfield (2005) |
| Release date | 23 April 2009 (15 years ago) | May 2005 (19 years ago) |
Detailed specifications
Phenom II X4 955 BE 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 | 3.2 GHz | 2.8 GHz |
| Boost clock speed | 3.2 GHz | 2.8 GHz |
| Bus rate | no data | 800 MHz |
| L1 cache | 128 KB (per core) | 28 KB |
| L2 cache | 512 KB (per core) | 2 MB |
| L3 cache | 6 MB (shared) | 0 KB |
| Chip lithography | 45 nm | 90 nm |
| Die size | 258 mm2 | 206 mm2 |
| Maximum core temperature | no data | 64 °C |
| Number of transistors | 758 million | 169 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | + | - |
| VID voltage range | no data | 1.2V-1.4V |
Compatibility
Information on Phenom II X4 955 BE 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 | AM3 | PLGA775 |
| Power consumption (TDP) | 125 Watt | 95 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Phenom II X4 955 BE and Pentium D 820. You'll probably need this information if you require some particular technology.
| Enhanced SpeedStep (EIST) | no data | - |
| Turbo Boost Technology | no data | - |
| Hyper-Threading Technology | no data | - |
| Idle States | no data | + |
| Demand Based Switching | no data | - |
| PAE | no data | 32 Bit |
| FSB parity | no data | - |
Security technologies
Phenom II X4 955 BE and Pentium D 820 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 X4 955 BE and Pentium D 820 are enumerated here.
| AMD-V | + | - |
| VT-d | no data | - |
| VT-x | no data | - |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Phenom II X4 955 BE and Pentium D 820. 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 | On certain motherboards (Chipset feature) | no data |
Peripherals
Specifications and connection of peripherals supported by Phenom II X4 955 BE and Pentium D 820.
| PCIe version | 2.0 | no data |
Pros & cons summary
| Physical cores | 4 | 2 |
| Threads | 4 | 2 |
| Chip lithography | 45 nm | 90 nm |
| Power consumption (TDP) | 125 Watt | 95 Watt |
Phenom II X4 955 BE has 100% more physical cores and 100% more threads, and a 100% more advanced lithography process.
Pentium D 820, on the other hand, has 31.6% lower power consumption.
We couldn't decide between Phenom II X4 955 BE and Pentium D 820. We've got no test results to judge.
Should you still have questions on choice between Phenom II X4 955 BE and Pentium D 820, ask them in Comments section, and we shall answer.
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