AMD K6-III+ 475ACZ

AMD K6-III+ 475ACZ is a single-core mobile processor from AMD, built on the 180 nm process with a 475.00 MHz base clock and a 12 W TDP. It occupies the 50th percentile among all CPUs in the database, placing it squarely in the middle of the performance distribution, though its benchmark score of 0 indicates it has not been subjected to the standard test suite.

Benchmark Performance

The K6-III+ 475ACZ presents a peculiar case in the benchmark database: its average benchmark score is recorded as 0, and the nearestRivals field is empty, meaning there are no direct comparative scores or deltaPct values available for analysis. This absence of data is itself informative — it suggests the processor is either too old or too niche to have been included in modern benchmarking runs, which typically favor more recent architectures.

With a percentileVsAllCpus of 50, the data positions this chip at the exact median of all recorded CPUs. This is a remarkable statistical outcome for a part from 2000, but it likely reflects the skewed distribution of the database (which includes many low-power embedded and legacy parts) rather than genuine mid-pack performance. The 475.00 MHz clock speed, combined with a single core and single thread, would place it near the bottom of any modern performance ranking, yet the percentile suggests it outperforms half of the recorded population — a testament to how many very weak processors exist in the database.

The L1 cache is 64 KB and L2 is 256 KB, which for its era was substantial, but without rival scores, the data cannot confirm whether this translated into competitive throughput. The 0 benchmark score means no multi-core or single-thread figures exist to interpret, so any statement about its speed relative to peers must remain qualitative. What the data does show is a processor that was likely competitive in its time but has no measurable presence in the current benchmark ecosystem.

Power and Thermals

The 12 W TDP is a defining characteristic of the K6-III+ 475ACZ, classifying it firmly in the ultra-low-power segment. This figure is remarkably low even by modern standards — many contemporary laptop chips consume several times this amount under load. For a mobile processor released in 2000, this TDP would have allowed for fanless or passively cooled designs in thin-and-light notebooks, and it suggests the chip was engineered for battery preservation rather than raw performance.

The 180 nm process node is relatively large by today's metrics, but the 21 million transistors and 76 mm² die size indicate a compact, efficient design for its generation. The low TDP implies that a modest heatsink or even a heat spreader with adequate airflow would suffice; no exotic cooling solution would be required. In practical terms, this processor belongs to the class of components that can be cooled by a simple aluminum fin array, making it suitable for sealed or semi-sealed chassis designs.

The thermal implications are clear: a 12 W part generates minimal heat, which reduces the need for active cooling and extends component longevity. This is a significant advantage for mobile use, where thermal management is often the primary constraint on performance. The data does not provide any thermal throttling figures or sustained load temperatures, but the TDP alone suggests that thermal headroom would rarely be a limiting factor, even under continuous operation.

Who Should Consider It

Given its mobile market segment and 12 W TDP, the K6-III+ 475ACZ is best suited for users running lightweight, single-threaded workloads on legacy hardware. The single core and single thread configuration means it can handle basic office tasks — word processing, spreadsheet navigation, email — but would struggle with any modern multitasking environment that expects multiple background processes.

For gaming, the data offers no direct evidence of capability, but the 475.00 MHz clock and lack of integrated graphics (the integratedGraphics field is null) mean it would require a discrete GPU for any graphical output, and even then, CPU-bound games from its era (circa 2000) would run at playable framerates. Modern games are not a realistic consideration given the architectural age.

Content creation is not a viable workload for this processor. Video editing, 3D rendering, or even high-resolution photo manipulation require multi-threaded performance and clock speeds several times higher than 475.00 MHz. The 64 KB L1 and 256 KB L2 caches provide some benefit for repetitive data access, which could help with specific algorithmic tasks, but the absence of any boost clock or turbo capability means there is no headroom for bursty workloads.

The processor is end-of-life, so it is not a purchase recommendation for new builds. However, for hobbyists restoring vintage laptops or industrial systems that require a specific Super Socket 7 platform, its low power draw and adequate single-thread performance for legacy software make it a functional choice. The 50th percentile ranking suggests it is not the weakest option available, but it is far from a performance leader.

Platform and Compatibility

The K6-III+ 475ACZ uses the AMD Super Socket 7 socket, which is a proprietary platform that supports a range of AMD and compatible processors from the late 1990s and early 2000s. The architecture is listed as K7 with the codename Sharptooth, which places it in the K6-III+ family — a notable distinction from the earlier K6-2 series, primarily in its integrated L2 cache.

Memory support is listed as "unknown" and depends on the motherboard, which means the chip itself does not dictate memory type or capacity. This is typical for processors of this era, where the memory controller resided on the motherboard chipset rather than the CPU. ECC memory is not supported (eccMemory is false), so users must use non-ECC modules.

There is no PCIe support listed (pcie is null), which is expected given the 2000 release date — PCIe did not exist commercially until several years later. The platform would use legacy PCI and possibly AGP slots for expansion, but the data does not specify these details. The upgrade path is limited to other Super Socket 7 processors, but with the K6-III+ being near the top of that platform's lineup, there is little room for meaningful improvement without changing the motherboard and socket entirely.

The multiplier is locked (multiplierUnlocked is false), so users cannot overclock by adjusting the clock multiplier. The base clock is fixed at 475.00 MHz, and there is no boost clock, making the operating frequency immutable. The process node of 180 nm and 21 million transistors are fixed characteristics that define the chip's physical limits.

How It Compares

Since the nearestRivals field is empty, there are no direct competitor comparisons available from the fact pack. The percentileVsAllCpus of 50 provides a global reference point, indicating the chip sits at the median of all CPUs in the database, but this is a broad statistical measure rather than a head-to-head comparison.

Without rival names, scores, or deltaPct values, the data cannot substantiate any claims about how this processor performs against specific alternatives. The lack of benchmark scores (avgBenchmarkScore is 0) further complicates any comparative analysis, as there is no quantitative basis for ranking.

The only verifiable comparison is against the general population: at the 50th percentile, it is exactly average in the database's ranking system. This could mean it outperforms an equal number of CPUs as it underperforms, but given the database likely includes many low-power embedded parts, this is not a meaningful indicator of consumer performance. For any real-world comparison, one would need to look at contemporaneous x86 processors, but such data is absent from the fact pack.

FAQ

Q: What is the clock speed of the AMD K6-III+ 475ACZ?

A: The base clock is 475.00 MHz, with no boost clock available.

Q: Does this processor support ECC memory?

A: No, the eccMemory field is false, so ECC memory is not supported.

Q: What is the TDP and what cooling does it require?

A: The TDP is 12 W, which indicates a low-power part that can be cooled by a simple heatsink without active cooling in most cases.

Q: Is this processor unlocked for overclocking?

A: No, the multiplierUnlocked field is false, so the clock multiplier is locked.

Q: What socket does this processor use?

A: It uses the AMD Super Socket 7 socket.

Q: When was this processor released?

A: The release date is 2000-04-17, and it is now end-of-life.

Single-Thread vs Multi-Thread Behavior

The K6-III+ 475ACZ has exactly one core and one thread, which means there is no multi-threaded capability whatsoever. This is a fundamental architectural limitation: any workload that can utilize multiple threads will be entirely confined to a single execution stream, and the operating system cannot offload background tasks to other cores.

The single-thread performance is defined by the 475.00 MHz clock and the cache hierarchy of 64 KB L1 and 256 KB L2. These cache sizes are relatively generous for the clock speed, which can mitigate the impact of memory latency on single-threaded workloads. The data suggests that for purely sequential tasks — such as legacy spreadsheet recalculation or text-based programming — the processor could deliver acceptable performance, though the 50th percentile ranking indicates it is not exceptional.

The lack of a boost clock means there is no transient performance spike for single-thread bursts; the processor runs at a constant 475.00 MHz regardless of load. This is a predictable but unremarkable behavior. For multi-threaded workloads, the processor is effectively ineligible — no software designed for modern multi-core systems would run efficiently, and even older multi-threaded applications would show no benefit over single-threaded execution.

The practical implication is that this chip is strictly for single-threaded, single-tasking environments. Any attempt to run a modern operating system with background services, browser tabs, or multimedia playback would quickly saturate the single thread, leading to sluggish response times. The 12 W TDP and mobile segment suggest it was designed for embedded or ultra-portable use cases where responsiveness was less critical than battery life and thermal output.