Pentium III 866 vs Atom Z520
Primary details
Comparing Atom Z520 and Pentium III 866 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Desktop processor |
| Series | Intel Atom | no data |
| Architecture codename | Silverthorne (2008−2010) | Coppermine T (2000) |
| Release date | 2 April 2008 (16 years ago) | 20 March 2000 (24 years ago) |
| Launch price (MSRP) | $65 | no data |
Detailed specifications
Atom Z520 and Pentium III 866 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 | 1 (Single-Core) | 1 (Single-Core) |
| Threads | 2 | 1 |
| Base clock speed | 1.33 GHz | no data |
| Boost clock speed | 0.03 GHz | 0.87 GHz |
| Bus type | FSB | no data |
| Bus rate | 533.33 MT/s | no data |
| Multiplier | 10 | no data |
| L1 cache | 56 KB | 32 KB |
| L2 cache | 512 KB | 256 KB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 45 nm | 180 nm |
| Die size | 24.18 mm2 | 106 mm2 |
| Maximum core temperature | 90 °C | no data |
| Maximum case temperature (TCase) | no data | 80 °C |
| Number of transistors | 47 Million | 28 million |
| 64 bit support | - | - |
| Windows 11 compatibility | - | - |
| VID voltage range | 0.75-1.1V | no data |
Compatibility
Information on Atom Z520 and Pentium III 866 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 (Uniprocessor) | 2 |
| Socket | PBGA441 | 370 |
| Power consumption (TDP) | 2 Watt | 27 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Atom Z520 and Pentium III 866. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE2, Intel® SSE3, Intel® SSSE3 | no data |
| 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
Atom Z520 and Pentium III 866 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 Atom Z520 and Pentium III 866 are enumerated here.
| VT-d | - | no data |
| VT-x | + | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | - | On certain motherboards (Chipset feature) |
Pros & cons summary
| Recency | 2 April 2008 | 20 March 2000 |
| Threads | 2 | 1 |
| Chip lithography | 45 nm | 180 nm |
| Power consumption (TDP) | 2 Watt | 27 Watt |
Atom Z520 has an age advantage of 8 years, 100% more threads, a 300% more advanced lithography process, and 1250% lower power consumption.
We couldn't decide between Atom Z520 and Pentium III 866. We've got no test results to judge.
Be aware that Atom Z520 is a notebook processor while Pentium III 866 is a desktop one.
Should you still have questions on choice between Atom Z520 and Pentium III 866, ask them in Comments section, and we shall answer.
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