Intel Pentium D 820

The Intel Pentium D 820 is a desktop processor released on 2005-05-25, built on the NetBurst architecture with the Smithfield codename. It operates with 2 cores and 2 threads at a base clock of 2.80 GHz, and the benchmark database places it at the 50th percentile among all CPUs. With a TDP of 130 W and a 90 nm process, this end-of-life processor presents a specific performance profile that warrants examination.

Benchmark Performance

The FACT PACK lists no specific benchmark scores for the Pentium D 820, with an avgBenchmarkScore of 0. However, the percentileVsAllCpus field provides a critical data point: the processor sits at the 50th percentile. This means it outperforms roughly half of the CPUs in the database and trails the other half, placing it squarely in the median tier. The absence of a boost clock means the 2.80 GHz base clock is the maximum sustained frequency, so there is no dynamic headroom for short bursts. The 2 MB L2 cache and 28 KB L1 cache are modest by any standard, and the 90 nm process with 169 million transistors on a 206 mm² die reflects an older generation. The 50th percentile ranking suggests that in a mixed workload, the processor is neither a leader nor a laggard. For single-threaded tasks, the 2.80 GHz clock provides a fixed rate of execution, but the lack of Hyper-Threading means only 2 threads can be processed simultaneously. The data implies that its multi-threaded performance is constrained by the thread count, while its single-threaded performance is dictated by the clock speed. Since no rival scores or deltaPct values are provided, the percentile is the only comparative metric available, and it indicates a median standing that is neither impressive nor disappointing for its era.

Platform and Compatibility

The Pentium D 820 uses the Intel Socket 775, a platform that saw broad adoption. Memory support includes DDR1, DDR2, and DDR3, with a dual-channel memory bus. This wide memory compatibility is notable because it allows the platform to accommodate multiple memory generations, though the memory controller resides on the chipset rather than the CPU. The PCIe support is Gen 2, which is an early iteration of the interface. Integrated graphics are listed as "On certain motherboards (Chipset feature)", meaning the CPU itself contains no GPU, but some motherboards with a compatible chipset can provide display output. ECC memory is not supported, which limits its use in error-correcting environments. The multiplier is locked, so overclocking via multiplier changes is not possible. The part number is SL88T. The processor is end-of-life, and its upgrade path is limited to other Socket 775 processors, though the platform itself is mature. The release date of 2005-05-25 places it in the early dual-core era, and the 90 nm process node is a defining characteristic. The dual-channel memory bus doubles the data path compared to single-channel, which can benefit memory-intensive applications. The absence of an L3 cache is noted, as the cache hierarchy consists only of the 28 KB L1 and 2 MB L2.

How It Compares

The FACT PACK lists no nearest rivals for the Pentium D 820, meaning there are no specific competitor names, scores, or deltaPct values to reference. In the absence of direct rival data, the comparison must rely on the 50th percentile standing and architectural characteristics. The NetBurst architecture, with its long pipeline, was designed for high clock speeds, and the 2.80 GHz base clock reflects that design goal. The dual-core configuration with 2 threads means it can handle two simultaneous tasks, but it cannot execute more than two threads. Compared to later CPUs with more cores and threads, the Pentium D 820 would likely fall behind in multi-threaded benchmarks, but the 50th percentile suggests it holds a median position in a database that includes many older and lower-end parts. The lack of a boost clock means it cannot dynamically increase its frequency, so its performance is constant. The 2 MB L2 cache is available for the two cores, though the FACT PACK does not specify if it is shared or per-core. The memory support for DDR1, DDR2, and DDR3 is a distinguishing feature, but the actual memory bandwidth is not listed. The PCIe Gen 2 support is standard for the era. Without specific rivals, the analysis focuses on the absolute position: a median performer with a fixed clock and limited thread count.

FAQ

Q: What is the base clock speed of the Pentium D 820?

A: The base clock speed is 2.80 GHz, and there is no boost clock.

Q: How many cores and threads does it have?

A: It has 2 cores and 2 threads, meaning it does not support Hyper-Threading.

Q: What is the TDP of this processor?

A: The TDP is 130 W, which requires a substantial cooling solution.

Q: What memory types does it support?

A: It supports DDR1, DDR2, and DDR3 memory, with a dual-channel memory bus.

Q: Does it have integrated graphics?

A: Integrated graphics are available on certain motherboards as a chipset feature, but not on the CPU itself.

Q: What socket does it use?

A: It uses the Intel Socket 775.

Q: Is the multiplier unlocked?

A: No, the multiplier is locked.

Q: What is the process node?

A: The process node is 90 nm, with 169 million transistors on a 206 mm² die.

Power and Thermals

The TDP is 130 W, which is a high figure for a dual-core processor. This TDP class implies that a capable air cooler is necessary, and in many cases, a more robust cooling solution may be required to maintain stable operation. The 90 nm process node contributes to this power draw, as smaller nodes typically reduce power consumption. The NetBurst architecture is known for high power consumption, and the 130 W TDP reflects that characteristic. The data shows that the processor runs hot relative to its performance class. A 130 W TDP means that the cooling solution must be designed to dissipate that heat continuously. The lack of a boost clock means the processor runs at a constant 2.80 GHz, which keeps power draw steady. The 169 million transistors on a 206 mm² die also indicate a relatively large chip for the era. For system builders, the 130 W TDP means that power supply and cooling must be chosen accordingly. The end-of-life status means that finding new coolers might be difficult, but the 130 W figure is the key constraint. The processor does not support ECC memory, which is unrelated to thermals but relevant to platform design. The 130 W TDP is a constant factor that influences chassis airflow and fan selection.

Who Should Consider It

Given its 50th percentile ranking and 2-core/2-thread configuration, the Pentium D 820 is suited for basic desktop tasks. For office workloads such as word processing, spreadsheets, and web browsing, the 2.80 GHz base clock provides adequate single-thread performance. However, for modern gaming, the lack of multiple threads and a boost clock would likely result in subpar performance, as most games require more than 2 threads. For content creation, such as video editing or 3D rendering, the 2-thread limitation is a severe bottleneck, and the 130 W TDP would be a drawback. The processor is end-of-life, so it is not recommended for new builds. It could be used for legacy systems or as a basic secondary machine. The dual-channel memory support and PCIe Gen 2 allow for a reasonable platform, but the CPU's compute capability is limited. The 28 KB L1 and 2 MB L2 caches are small by modern standards. The data indicates that this is a processor for light, single-threaded tasks, and its 50th percentile position reflects that it is not a high-end part. For users who need to run older software that is not multi-threaded, the 2.80 GHz clock is acceptable. The lack of integrated graphics on the CPU means a discrete GPU is required, unless a compatible motherboard provides chipset-based graphics.

Single-Thread vs Multi-Thread Behavior

The Pentium D 820 has 2 cores and 2 threads, which means it can execute two threads simultaneously, but no more. The base clock of 2.80 GHz applies to both cores. In single-threaded workloads, the processor operates at 2.80 GHz, and the NetBurst architecture's high clock speed is its primary advantage. However, the 90 nm process and older architecture mean that the instructions per clock (IPC) is likely lower than newer CPUs, though the FACT PACK does not provide IPC data. In multi-threaded workloads, the 2 threads allow for dual-core scaling, but the lack of Hyper-Threading means that a single core cannot handle two threads. The 2 MB L2 cache is available for the two cores, though the sharing model is unspecified. The 50th percentile suggests that in mixed workloads, it performs at the median. The single-thread performance is dictated by the 2.80 GHz clock, while multi-thread performance is limited to 2 threads. For applications that are heavily single-threaded, the processor may perform adequately, but for multi-threaded applications, it will not scale beyond 2 threads. The data implies that users should prioritize single-threaded applications. The absence of a boost clock means that the processor cannot dynamically increase its frequency for short bursts, so sustained single-thread performance is equal to the base clock. The 130 W TDP is a constant factor, and the dual-channel memory bus can help with memory-bound tasks, but the overall thread count is the defining limitation.