Atom Z520 vs Pentium III 1400S
Aggregate performance score
Pentium III 1400S outperforms Atom Z520 by an impressive 50% based on our aggregate benchmark results.
Primary details
Comparing Pentium III 1400S and Atom Z520 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 3345 | 3387 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | no data | Intel Atom |
| Power efficiency | 0.35 | 3.79 |
| Architecture codename | Tualatin (2000−2002) | Silverthorne (2008−2010) |
| Release date | January 2002 (22 years ago) | 2 April 2008 (16 years ago) |
| Launch price (MSRP) | no data | $65 |
Detailed specifications
Pentium III 1400S and Atom Z520 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 | 1 | 2 |
| Base clock speed | no data | 1.33 GHz |
| Boost clock speed | 1.4 GHz | 0.03 GHz |
| Bus type | no data | FSB |
| Bus rate | no data | 533.33 MT/s |
| Multiplier | no data | 10 |
| L1 cache | 8 KB | 56 KB |
| L2 cache | 512 KB | 512 KB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 130 nm | 45 nm |
| Die size | 80 mm2 | 24.18 mm2 |
| Maximum core temperature | no data | 90 °C |
| Maximum case temperature (TCase) | 69 °C | no data |
| Number of transistors | 44 million | 47 Million |
| 64 bit support | - | - |
| Windows 11 compatibility | - | - |
| VID voltage range | no data | 0.75-1.1V |
Compatibility
Information on Pentium III 1400S and Atom Z520 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 | 1 (Uniprocessor) |
| Socket | 370 | PBGA441 |
| Power consumption (TDP) | 32 Watt | 2 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium III 1400S and Atom Z520. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE2, Intel® SSE3, Intel® SSSE3 |
| 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
Pentium III 1400S and Atom Z520 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 Pentium III 1400S and Atom Z520 are enumerated here.
| VT-d | no data | - |
| VT-x | no 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.
Combined synthetic benchmark score
This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
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.
Pros & cons summary
| Performance score | 0.12 | 0.08 |
| Threads | 1 | 2 |
| Chip lithography | 130 nm | 45 nm |
| Power consumption (TDP) | 32 Watt | 2 Watt |
Pentium III 1400S has a 50% higher aggregate performance score.
Atom Z520, on the other hand, has 100% more threads, a 188.9% more advanced lithography process, and 1500% lower power consumption.
The Pentium III 1400S is our recommended choice as it beats the Atom Z520 in performance tests.
Note that Pentium III 1400S is a desktop processor while Atom Z520 is a notebook one.
Should you still have questions on choice between Pentium III 1400S and Atom Z520, ask them in Comments section, and we shall answer.
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