INTEL

Intel Pentium III Xeon 866 5V-12V

Intel processor specifications and benchmark scores

1
Cores
1
Threads
GHz Boost
25W
TDP

Intel Pentium III Xeon 866 5V-12V Specifications

⚙️

Pentium III Xeon 866 5V-12V Core Configuration

Processing cores and threading

The Intel Pentium III Xeon 866 5V-12V features 1 physical cores and 1 threads, which directly impacts multi-threaded performance in CPU benchmarks. More cores allow the processor to handle parallel workloads efficiently, improving performance in video editing, 3D rendering, and multitasking scenarios. Thread count determines how many simultaneous tasks the CPU can process, with higher thread counts benefiting productivity applications and content creation workflows.

Cores
1
Threads
1
SMP CPUs
2
⏱️

Pentium III Xeon 866 5V-12V Clock Speeds

Base and boost frequencies

Clock speed is a critical factor in Pentium III Xeon 866 5V-12V benchmark performance, measured in GHz. The base clock represents the guaranteed operating frequency, while the boost clock indicates maximum single-core performance under optimal conditions. Higher clock speeds translate to faster single-threaded performance, which is essential for gaming and applications that don't fully utilize multiple cores. The Pentium III Xeon 866 5V-12V by Intel can dynamically adjust its frequency based on workload and thermal headroom.

Base Clock
866 GHz
Boost Clock
N/A
Multiplier
6.5x
💾

Intel's Pentium III Xeon 866 5V-12V Cache Hierarchy

L1, L2, L3 cache sizes

Cache memory is ultra-fast storage built directly into the Pentium III Xeon 866 5V-12V processor die. L1 cache provides the fastest access for frequently used data, while L2 and L3 caches offer progressively larger storage with slightly higher latency. Larger cache sizes significantly improve CPU benchmark scores by reducing memory access times. The Pentium III Xeon 866 5V-12V's cache configuration is optimized for both gaming performance and productivity workloads, minimizing data fetch delays during intensive computations.

L1 Cache
32 KB
L2 Cache
256 KB
🏗️

P6 Architecture & Process

Manufacturing and design details

The Intel Pentium III Xeon 866 5V-12V is built on Intel's 180 nm manufacturing process, which determines power efficiency and thermal characteristics. Smaller process nodes allow for more transistors in the same space, enabling higher performance per watt. The architecture defines how the processor handles instructions and manages data flow, directly impacting benchmark results across different workload types. Modern CPU architectures like the one in Pentium III Xeon 866 5V-12V incorporate advanced branch prediction and out-of-order execution for optimal performance.

Architecture
P6
Codename
Cascades
Process Node
180 nm
Foundry
Intel
Transistors
28 million
Die Size
106 mm²
Generation
Pentium III Xeon (Cascades)
🔢

P6 Instruction Set Features

Supported CPU instructions and extensions

The Pentium III Xeon 866 5V-12V by Intel supports various instruction set extensions that enable optimized performance for specific workloads. SIMD instructions like SSE and AVX accelerate multimedia, scientific computing, and AI workloads by processing multiple data points simultaneously. Features like AES-NI provide hardware-accelerated encryption, while AVX-512 (if supported) enables advanced vector processing for data centers and high-performance computing. These instruction sets are critical for software compatibility and performance in modern applications.

MMX
SSE
🔌

Pentium III Xeon 866 5V-12V Power & Thermal

TDP and power specifications

The Intel Pentium III Xeon 866 5V-12V has a TDP (Thermal Design Power) of 25W, indicating the cooling solution required for sustained operation. TDP affects both system power consumption and the type of cooler needed. Lower TDP processors are ideal for compact builds and laptops, while higher TDP chips typically offer better sustained performance in demanding CPU benchmarks. Understanding power requirements helps ensure your system can deliver consistent performance without thermal throttling.

TDP
25W
🔧

Intel Slot 2 Platform & Socket

Compatibility information

The Pentium III Xeon 866 5V-12V uses the Intel Slot 2 socket, which determines motherboard compatibility. Choosing the right platform is essential for building a system around this processor. The socket type also influences available features like PCIe lanes, memory support, and upgrade paths. When comparing CPU benchmarks, ensure you're looking at processors compatible with your existing or planned motherboard to make informed purchasing decisions.

Socket
Intel Slot 2
Package
SECC
DDR5

Intel Slot 2 Memory Support

RAM compatibility and speeds

Memory support specifications for the Pentium III Xeon 866 5V-12V define which RAM types and speeds are compatible. Faster memory can significantly improve CPU benchmark performance, especially in memory-intensive applications and gaming. The memory controller integrated into the Pentium III Xeon 866 5V-12V determines maximum supported speeds and channels. Dual-channel or quad-channel memory configurations can double or quadruple memory bandwidth, providing noticeable performance gains in content creation and scientific workloads.

Memory Bus
Single-channel
📦

Pentium III Xeon 866 5V-12V Product Information

Release and pricing details

The Intel Pentium III Xeon 866 5V-12V is manufactured by Intel and represents their commitment to delivering competitive CPU performance. Understanding the release date and pricing helps contextualize benchmark comparisons with other processors from the same generation. Launch pricing provides a baseline for evaluating value, though street prices often differ. Whether you're building a new system or upgrading, the Pentium III Xeon 866 5V-12V by Intel offers a specific balance of performance, features, and cost within Intel's product lineup.

Manufacturer
Intel
Release Date
Apr 2000
Launch Price
$826
Market
Server/Workstation
Status
End-of-life
Part Number
SL3WWSL4HBSL4PZSL4U2

Pentium III Xeon 866 5V-12V Benchmark Scores

📊

No benchmark data available for this CPU.

About Intel Pentium III Xeon 866 5V-12V

The Intel Pentium III Xeon 866 5V-12V, launched in April 2000, represented a specialized server and workstation CPU built on the 180nm Cascades core, emphasizing stability and reliability in multi-processor configurations rather than raw consumer speed. Its 866 MHz operating frequency and unique Slot 2 interface catered to a high-availability market segment where dual and quad-processor boards demanded consistent throughput for business-critical applications. The Intel Pentium III Xeon 866 5V-12V operated with a remarkably low 25W TDP for its era, a design consideration essential for dense system deployments where thermal management was paramount. Without contemporary synthetic benchmark data, its performance profile is best understood through its architectural role, offering a substantial upgrade in cache and system bus capabilities over the desktop Pentium III line. This processor was a key building block for entry-level servers and technical workstations of its time, with its $826 launch price reflecting its professional-grade positioning. Build recommendations for such a historical part are now purely for legacy system maintenance or collector enthusiasts, as modern software and performance demands have long since eclipsed its capabilities.

  • Architecture: 180nm Cascades core with Slot 2 packaging for scalable MP systems.
  • Performance: Positioned for reliable server throughput rather than peak single-threaded benchmarks.
  • Market: Targeted at budget-conscious enterprise and technical workstation segments upon release.
  • Legacy Value: Now primarily of interest for preserving or studying late-90s server hardware ecosystems.

The AMD Equivalent of Pentium III Xeon 866 5V-12V

Looking for a similar processor from AMD? The AMD Ryzen 5 1400 offers comparable performance and features in the AMD lineup.

AMD Ryzen 5 1400

AMD • 4 Cores

View Specs Compare

Popular Intel Pentium III Xeon 866 5V-12V Comparisons

See how the Pentium III Xeon 866 5V-12V stacks up against similar processors from the same generation and competing brands.

Compare Pentium III Xeon 866 5V-12V with Other CPUs

Select another CPU to compare specifications and benchmarks side-by-side.

Browse CPUs