Pentium III 1266S vs Celeron E3400
Aggregate performance score
Celeron E3400 outperforms Pentium III 1266S by a whopping 183% based on our aggregate benchmark results.
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 3129 | 3531 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 3.72 | no data |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 0.84 | 0.64 |
| Designer | Intel | Intel |
| Manufacturer | Intel | no data |
| Architecture codename | Wolfdale (2008−2010) | Tualatin (2000−2002) |
| Release date | 17 January 2010 (15 years ago) | July 2001 (24 years ago) |
| Launch price (MSRP) | $76 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Detailed specifications
Celeron E3400 and Pentium III 1266S 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 | 2 (Dual-core) | 1 (Single-Core) |
| Threads | 2 | 1 |
| Base clock speed | 2.6 GHz | no data |
| Boost clock speed | 2.6 GHz | 1.27 GHz |
| L1 cache | 64 KB (per core) | 8 KB |
| L2 cache | 1 MB (shared) | 512 KB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 45 nm | 130 nm |
| Die size | 82 mm2 | 80 mm2 |
| Maximum core temperature | 74 °C | no data |
| Maximum case temperature (TCase) | no data | 69 °C |
| Number of transistors | 228 million | 44 million |
| 64 bit support | + | - |
| Windows 11 compatibility | - | - |
| VID voltage range | 0.85V-1.3625V | no data |
Compatibility
Information on Celeron E3400 and Pentium III 1266S 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 |
| Socket | LGA775 | 370 |
| Power consumption (TDP) | 65 Watt | 30 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Celeron E3400 and Pentium III 1266S. 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 |
| Thermal Monitoring | + | - |
Security technologies
Celeron E3400 and Pentium III 1266S 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 Celeron E3400 and Pentium III 1266S are enumerated here.
| VT-d | - | no data |
| VT-x | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Celeron E3400 and Pentium III 1266S. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | no data |
Peripherals
Specifications and connection of peripherals supported by Celeron E3400 and Pentium III 1266S.
| PCIe version | 2.0 | no data |
Synthetic benchmarks
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.
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. Other than that, Passmark measures multi-core performance.
Pros & cons summary
| Performance score | 0.51 | 0.18 |
| Physical cores | 2 | 1 |
| Threads | 2 | 1 |
| Chip lithography | 45 nm | 130 nm |
| Power consumption (TDP) | 65 Watt | 30 Watt |
Celeron E3400 has a 183.3% higher aggregate performance score, 100% more physical cores and 100% more threads, and a 188.9% more advanced lithography process.
Pentium III 1266S, on the other hand, has 116.7% lower power consumption.
The Intel Celeron E3400 is our recommended choice as it beats the Intel Pentium III 1266S in performance tests.
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