AMD Opteron 840

The AMD Opteron 840 is a single-core server processor built on the K8 microarchitecture, specifically the SledgeHammer core stepping. It was released for the server and workstation market segment and is now end-of-life. This analysis focuses on its platform characteristics and the implications of its benchmark percentile position, given the available data.

Platform and Compatibility

The Opteron 840 is physically and electrically designed for the AMD Socket 940 platform. This socket is a critical element of the processor's identity, as it is the foundation for the first-generation Opteron server lineup. The processor is based on the 130 nm process node, with a die size of 193 mm² and a total of 106 million transistors. The chip operates at a base clock of 1400.00 MHz and carries a thermal design power (TDP) of 85 watts.

Memory support is defined by a dual-channel memory bus, though the specific memory types and speeds are not detailed in the available data. Notably, the processor does not support ECC memory, which is an unusual omission for a server-class part and a significant consideration for any potential deployment in error-sensitive workloads. The platform provides PCIe Gen 2 connectivity, which dictates the maximum bandwidth available for expansion cards and storage controllers. The processor is not multiplier-unlocked, meaning its clock frequency is fixed and not intended for user adjustment.

The upgrade path for this platform is inherently limited by its age and market segment. The Socket 940 platform is tied to the first-generation Opteron and Athlon 64 FX processors, and the Opteron 840, as a single-core part, sits at the entry point of that lineup. Any upgrade would require selecting a different Socket 940 processor, but the data does not specify which, if any, higher-performing options exist within this socket's compatibility envelope. The part number is OSA840CCO5AI, which is useful for precise identification.

Who Should Consider It

This processor is not a general-purpose solution for modern workloads. The benchmark data provides no multi-core or single-core scores, but the percentile ranking against all CPUs is 50, which places it exactly in the middle of the database's historical record. This percentile is a relative measure of its performance against every other processor ever benchmarked, not a measure of its capability for contemporary tasks.

For gaming, this processor is not a viable choice. A single core at 1.4 GHz, with no boost clock, lacks the fundamental processing power required for modern game engines, which rely on multiple high-frequency cores. The absence of a boost clock and the lack of ECC support further reinforce its server-oriented, rather than consumer, design intent.

For content creation and office productivity, the same limitations apply. Single-threaded performance is the only available resource, and the 1400.00 MHz base clock is low by any historical standard. The data indicates no integrated graphics, so a discrete GPU would be mandatory for any display output. The only scenario where this processor might be considered is in a legacy server environment running software that is strictly single-threaded and does not require ECC memory, where its 85-watt TDP and fixed clock might be acceptable. For all other purposes, the data suggests this is a historical artifact rather than a practical computing tool.

Benchmark Performance

The the benchmark database contains no benchmark scores for the Opteron 840. The `benchmarks` array is empty, and the `avgBenchmarkScore` is 0. This absence of data is itself a significant finding. The only quantitative performance indicator available is the `percentileVsAllCpus` field, which is 50. This means that in the database's historical distribution of all tested CPUs, the Opteron 840 sits at the exact median.

This 50th percentile is a starting point for interpretation, but it must be understood within the context of the database's composition. The database likely includes many modern processors with vastly higher core counts and clock speeds. A 50th percentile ranking against that full distribution suggests that the Opteron 840 outperforms half of all processors ever recorded, which reflects the long tail of low-end and embedded CPUs in the database. However, it is not a measure of absolute performance. The lack of any benchmark score means that no comparison to rivals can be made with deltas or percentages. The `nearestRivals` array is empty, so there is no direct competitor data to analyze. The processor's performance can only be described qualitatively: it is a single-core, low-clock processor whose historical median position is a statistical artifact of the database's composition, not a sign of modern capability.

How It Compares

The the benchmark database lists no nearest rivals for the Opteron 840. The `nearestRivals` field is an empty array, which precludes any direct comparative analysis. This is an unusual situation, as most processors in the database have at least one or two adjacent competitors. The absence of rivals might indicate that the Opteron 840's performance profile is so unique in its age and design that no other processor in the database falls within a comparable score range, or it might simply reflect a gap in the data collection.

Without rival data, it is impossible to state whether the Opteron 840 is 10% faster or 20% slower than any other specific chip. The only comparison point is the global percentile of 50, which places it in the middle of the entire historical distribution. This means that, in the database's records, it is faster than half of all CPUs and slower than the other half. Given its single-core, 1.4 GHz design, the processors it outperforms are likely to be older or even more limited parts, while the processors it trails are likely to be the vast majority of multi-core chips released in the last two decades. The lack of a direct rival list is a notable gap, but the global percentile provides a coarse positioning that aligns with the processor's status as an early 64-bit server chip.

Single-Thread vs Multi-Thread Behavior

The Opteron 840 has 1 core and 1 thread, which means it is a pure single-threaded processor. There is no multi-threading capability, and the operating system can only schedule one execution thread at a time. This design has a profound impact on workload behavior.

The base clock of 1400.00 MHz is the only speed at which the processor operates; there is no boost clock to provide a temporary performance increase for a single active thread. Consequently, every task, whether it is a simple integer calculation or a complex floating-point operation, is bound by this 1.4 GHz ceiling. For workloads that are inherently single-threaded, such as legacy database queries or certain scientific simulations written before the multi-core era, the Opteron 840's performance is strictly a function of its clock speed and the K8 architecture's instructions per cycle.

For multi-threaded workloads, the processor is fundamentally inadequate. With only one thread, it cannot parallelize any task. A modern operating system will run multiple processes by time-slicing the single core, but this results in severe contention and poor responsiveness. The lack of any multi-thread score in the benchmark data is consistent with this design; there is no multi-thread performance to measure. The 50th percentile ranking, therefore, reflects its single-threaded performance in a distribution that is heavily weighted toward multi-core chips. In real-world terms, the Opteron 840 would be limited to a single, simple task at a time, and any attempt to run multiple applications or a modern multi-threaded operating system would result in a bottleneck. This processor is a representation of the early 64-bit era, where the focus was on addressable memory and single-core clock speed, not on parallel execution.