Intel Pentium III Xeon 800 5V-12V

The Intel Pentium III Xeon 800 5V-12V is a single-core server/workstation processor from the Cascades generation, built on Intel's P6 architecture. Released on 2000-01-11, this part operates at a base clock of 800 MHz with a 25 W TDP and a launch MSRP of $901. The database records no submitted benchmark scores for this SKU, resulting in an average benchmark score of 0, yet its percentile placement against all CPUs is 50, indicating it sits exactly at the median of the tracked historical performance distribution.

Benchmark Performance

The data shows an average benchmark score of 0, which means no standardized test results have been submitted for this part. The percentile field places it at 50, meaning it sits exactly at the median of all CPUs in the database. This is a curious position - a part with no recorded scores still holds a median percentile, suggesting the percentile is derived from architectural characteristics or historical estimates rather than live tests. The lack of scores is typical for end-of-life server parts from this era. The 800 MHz clock and 256 KB L2 cache are the primary performance indicators. Without rival deltas, the 50th percentile serves as the only comparative anchor. This median placement implies that, within the database's historical context, this processor was neither a standout performer nor a laggard; it occupied a middle ground. The 0 average score, however, means that any direct numeric comparison to other parts is impossible. The data invites the reader to interpret the 50th percentile as a rough positional marker, but the absence of raw scores leaves the actual throughput unquantified. The 1-core, 1-thread configuration further limits the scope of what the benchmark could have measured, as modern benchmarking suites typically emphasize multi-core scaling.

Single-Thread vs Multi-Thread Behavior

With 1 core and 1 thread, this processor is purely single-threaded. There is no boost clock, so the 800 MHz base clock is the maximum sustained frequency. This means workloads that are inherently serial - such as legacy database queries, single-threaded server scripts, or older applications - will see performance directly tied to the 800 MHz clock. The 32 KB L1 cache and 256 KB L2 cache help reduce latency for repeated data access. The absence of multi-threading means any parallel workload will be severely limited. The data implies that this part is best suited for tasks that cannot be parallelized, as it offers no multi-core headroom. In an era where even budget processors now feature multiple cores, this part's single-thread focus is a stark reminder of the past. The 5V-12V designation in the product name hints at the power delivery requirements of that time, but the core behavioral trait is the serial execution model. For real workloads, this means a single process can utilize the full processor, but any concurrent task would need to time-share the single execution pipeline. The 50th percentile placement suggests that, in its prime, its single-thread performance was adequate for the server tasks of the day, which were often I/O-bound rather than compute-bound.

Power and Thermals

The TDP is 25 W, a modest figure for a server/workstation processor. This low power draw implies that a simple air cooler, or even a passive heatsink in a well-ventilated chassis, would suffice. The 180 nm process node and 28 million transistors on a 106 mm² die contribute to this efficiency. The name includes "5V-12V", indicating support for both 5-volt and 12-volt power rails, a legacy feature of that era. The 25 W TDP means thermal management is straightforward, and the data suggests that cooling requirements are minimal compared to modern high-core-count parts. This low TDP is particularly notable given the server/workstation market segment, where power consumption was often a secondary concern to raw performance. The 180 nm process was relatively advanced for its time, allowing the 28 million transistors to be packed into a 106 mm² die. The thermal implications are clear: a 25 W part can be cooled with a low-profile cooler, making it suitable for dense server chassis where airflow is limited. The lack of a boost clock also means that thermal output remains constant under load, simplifying cooling design. The data indicates that this processor would not require any exotic cooling solutions.

Who Should Consider It

This is a server/workstation part, now end-of-life. The data shows it has 1 core and 1 thread, so it is not suitable for modern multitasking or parallel workloads. It lacks ECC memory support, meaning it is not intended for error-critical data integrity tasks. The single-channel memory bus further limits memory bandwidth. Given these constraints, the target audience is likely retro-computing enthusiasts, collectors, or those maintaining legacy server software that requires the original hardware environment. The 50th percentile placement suggests it was a mid-range part in its day, not a flagship. It would be appropriate for running legacy operating systems or single-threaded server applications that predate multi-core scaling. For gaming, this part is entirely unsuitable, as modern games require multi-core processors and high memory bandwidth. For content creation, the single core and lack of ECC make it a poor choice. For office productivity, the 800 MHz clock would struggle with modern web browsers and office suites. The only realistic use case is as a historical artifact or for running period-correct software in a virtualized or dedicated retro setup. The 0 average benchmark score further reinforces that it is not a part anyone would consider for current workloads.

How It Compares

The nearestRivals field in the data is empty, so no direct rival comparisons with specific names, scores, or delta percentages are available. The only comparative data point is the 50th percentile against all CPUs in the database, which places it exactly at the median. This means that while it is not an outlier in either direction, its absolute performance is anchored by its 800 MHz clock and 256 KB L2 cache. Without rival data, the analysis must rely on the architectural details: the P6 architecture, 180 nm process, and 1-core/1-thread configuration. The lack of rivals is itself informative, indicating that this part has no closely matched contemporaries in the current database, likely due to its age and end-of-life status. The empty nearestRivals array suggests that the database has not been populated with comparative data for this specific SKU, perhaps because it was a niche server part. In the absence of deltas, the 50th percentile serves as a relative measure, but it is a coarse one. The data implies that this processor's performance profile is so dated that no modern or even recent CPU is considered a "nearest rival" - it stands alone in its historical niche.

FAQ

Q: What is the TDP of the Intel Pentium III Xeon 800 5V-12V?

A: The TDP is 25 W.

Q: What socket does this processor use?

A: It uses the Intel Slot 2 socket.

Q: Does it support ECC memory?

A: No, ECC memory support is false.

Q: What is the release date?

A: It was released on 2000-01-11.

Q: What is the process node?

A: It is built on a 180 nm process node.

Q: What is the L2 cache size?

A: It has a 256 KB L2 cache.

Platform and Compatibility

The processor uses the Intel Slot 2 socket, which is a cartridge-based form factor. The memory bus is single-channel, and there is no PCIe support listed in the data, indicating this predates the PCIe standard. It has no integrated graphics, so a discrete graphics card is required. The upgrade path is essentially non-existent, as the part is end-of-life and the Slot 2 platform is obsolete. The 1-core/1-thread configuration and 800 MHz base clock define the platform's ceiling. The 5V-12V power designation suggests compatibility with legacy power supplies that provide both voltage rails. The lack of ECC memory support is a notable limitation for a server part, as it means memory errors would go undetected. The single-channel memory bus restricts bandwidth to what a single stick of memory can provide. The 180 nm process and 28 million transistors are the physical underpinnings, but they are not user-facing. The data shows that this platform is firmly rooted in the past, with no modern upgrade path. Anyone considering this part must be prepared to source legacy Slot 2 motherboards and compatible memory modules. The 50th percentile placement does not change the fact that the platform is obsolete, and the 0 average benchmark score confirms that no current performance expectations apply.