AMD Athlon 1400 (B)

The AMD Athlon 1400 (B) is a single-core desktop processor from the 1000 series, built on the K7 Thunderbird B architecture with a 180 nm process. It operates at a fixed 1400.00 MHz base clock with no boost capability, and its benchmark data shows a 50th percentile ranking among all CPUs, indicating it sits at the median of the performance spectrum for its era.

Who Should Consider It

This processor is strictly for legacy system builders or those maintaining period-correct hardware from the early 2000s. The data shows a single core and single thread configuration, which means modern multi-threaded workloads will not benefit from parallel execution. For everyday office tasks like word processing, spreadsheet work, and web browsing of static pages, the 1400.00 MHz clock speed provides adequate responsiveness for basic single-threaded applications.

Gamers from the era will find this suitable for titles that rely on high clock speeds rather than multi-core scaling, as the 1400 MHz frequency was competitive for its time. However, game performance will be limited by the lack of additional cores, so any title that attempted to use background threads would cause noticeable slowdowns. In terms of content creation, the 128 KB L1 and 256 KB L2 cache help with repetitive operations, but the absence of L3 cache and the single-channel memory bus at 2128 MB/s will bottleneck large file processing or video encoding tasks.

This is not a processor for modern productivity, but rather for retro computing enthusiasts, hobbyist overclockers exploring K7 architecture, or those building a secondary machine for legacy software compatibility. The end-of-life production status and 2001-06-05 release date confirm it is a museum piece rather than a daily driver.

Power and Thermals

The thermal design power (TDP) is rated at 72 watts, which places it in a modest power class. For a single-core chip on the 180 nm process, this TDP indicates a reasonably hot-running part that requires active cooling. The data does not specify a boost clock, so thermal load remains constant under full load at the 1400.00 MHz base clock.

A capable air cooler with a decent heatsink and fan will suffice for standard operation, given that the 72 W envelope is well within the range of typical copper or aluminum coolers from that period. Users should ensure adequate case airflow, as the 37 million transistors packed into a 120 mm² die size can generate concentrated heat spots. Passive cooling is not recommended; the 72 W figure demands at least a small fan. For overclocking attempts, the multiplier is locked (multiplierUnlocked: false), so any frequency increases would need to come from raising the front-side bus, which would increase thermal output beyond the 72 W baseline. The Thunderbird B core is known for running hot relative to later K7 revisions, so thermal paste quality and heatsink contact matter more than with cooler-running processors.

Benchmark Performance

Benchmark results for this processor are notably sparse — the avgBenchmarkScore is 0, and the nearestRivals list is empty. The percentileVsAllCpus field shows a 50th percentile ranking, which places it exactly at the median of all CPUs ever tested in this database. This is a meaningful data point: it indicates that half of all processors in the database perform better and half perform worse, but given the age of this part, the comparison pool includes many modern chips that vastly outperform it.

The absence of benchmark scores and rival comparisons means there are no exact deltas to cite. However, the 50th percentile rank suggests that in single-threaded workloads, this chip still outperforms half of the database entries — likely due to its relatively high 1400.00 MHz clock speed, which remains competitive against low-power modern processors in pure frequency terms. The single core and single thread configuration will cause it to fall behind in any multi-threaded test, but for single-threaded integer math or legacy instruction sets, the raw clock speed carries weight.

Memory bandwidth of 2128 MB/s is a significant limiter; the single-channel DDR1 bus (dependent on motherboard) means that memory-intensive benchmarks will show poor scaling compared to processors with dual-channel or higher-bandwidth memory. The 256 KB L2 cache helps mitigate some latency, but without L3 cache, the processor relies heavily on the memory bus for data beyond that 256 KB footprint.

How It Compares

Since the nearestRivals field is empty, there are no direct competitor comparisons with scores or deltaPct values to analyze. The data provides no rival names, no rival scores, and no percentage differences. This means any positional statement must be based solely on the percentileVsAllCpus value.

The 50th percentile rank implies that this processor sits in the middle of the pack, but this is a misleading statistic for modern use because the database likely includes many low-power embedded chips and older processors that this Athlon can outrun. In the context of its own era (mid-2001), the 1400.00 MHz clock was at the high end for AMD’s lineup, but without rival data, we cannot quantify its advantage over contemporary Intel Pentium 4 parts or earlier Athlon models.

The lack of benchmark scores (avgBenchmarkScore: 0) suggests that this specific sample either was not tested under standardized conditions or returned no usable results. This is common for end-of-life parts where the database may have incomplete records. Users should treat the 50th percentile as a rough guide rather than a precise performance indicator.

FAQ

Q: Does this processor have a boost clock?

A: No. The base clock is 1400.00 MHz, and the boostClock field is null, meaning it runs at a fixed frequency with no dynamic overclocking.

Q: What is the memory configuration?

A: It supports DDR1 memory (dependent on motherboard) via a single-channel bus with a maximum bandwidth of 2128 MB/s. ECC memory is not supported.

Q: Is the multiplier unlocked for overclocking?

A: No, the multiplierUnlocked field is false. Overclocking would require increasing the front-side bus, which is not guaranteed to work on all motherboards.

Q: Does it include integrated graphics?

A: The integratedGraphics field states "On certain motherboards (Chipset feature)", meaning the graphics is provided by the chipset, not the CPU itself.

Q: What is the production status and release date?

A: Production status is end-of-life, and the release date was 2001-06-05. The part number is A1400AMS3B.

Q: What is the cache hierarchy?

A: It has 128 KB of L1 cache and 256 KB of L2 cache. There is no L3 cache, no total L3, and no 3D V-Cache.

Platform and Compatibility

The AMD Athlon 1400 (B) uses the AMD Socket A interface, which is a pin-grid array socket that was standard for AMD desktop processors from 2000 to 2003. The architecture is K7 with the codename Thunderbird B, and the generation is listed as "Athlon Model 4 (Thunderbird B)". The process node is 180 nm, with 37 million transistors on a 120 mm² die.

Memory support is DDR1, but the exact type depends on the motherboard — the FACT PACK explicitly notes "Depends on motherboard" in the memorySupport field. The memory bus is single-channel, limiting bandwidth to 2128 MB/s. ECC memory is not supported. There is no PCIe support listed (pcie: null), which indicates this processor predates PCIe and relies on older AGP and PCI slots available on Socket A motherboards. The integrated graphics field notes that graphics are "On certain motherboards (Chipset feature)", so any display output comes from the chipset, not the CPU.

The launch MSRP was $253, which was a premium price point for a desktop processor at the time. The multiplier is locked, so overclocking is limited to bus speed adjustments. The production status is end-of-life, meaning no new units are manufactured, and users must source used or new-old-stock parts. Upgrade paths from this processor would involve moving to a different Socket A chip with more cores or a higher clock speed, but the platform itself is obsolete. The lack of PCIe support means modern graphics cards cannot be used directly, and the single-channel memory bus will bottleneck any modern workload. For compatibility, users need a Socket A motherboard with DDR1 slots and a chipset that supports the 1400 MHz front-side bus. The part number A1400AMS3B can be used to verify compatibility with specific motherboard BIOS versions.