Intel Core Duo ULV L2500

The Intel Core Duo ULV L2500 is a mobile processor from Intel's Core Duo (Yonah) family, featuring two cores and two threads at a base clock of 1.2 GHz. With a thermal design power (TDP) of 9 watts, it is engineered for ultra-low-power notebooks and embedded systems. In the benchmark database, it holds a percentile rank of 50, meaning it sits exactly at the median of all CPUs tracked, indicating average performance relative to the full population.

Benchmark Performance

The database lists no explicit benchmark scores for the L2500, but the percentileVsAllCpus value of 50 places it precisely at the midpoint of the CPU performance distribution. This implies that, in aggregate, it outperforms half of the processors in the database and lags behind the other half. Given its modest specifications—2 cores, 2 threads, a fixed 1.2 GHz base clock, and no boost clock—this median ranking is a reasonable outcome. The processor's performance is constrained by its low frequency, but the presence of two physical cores allows it to handle parallel workloads more effectively than a single-core part of similar clock speed.

The cache hierarchy consists of 64 KB of L1 and 2 MB of L2. The 2 MB L2 is shared between the two cores, which can improve data reuse in multi-threaded tasks. The 65 nm process node, with 151 million transistors on a 90 mm² die, is typical for mid-2000s mobile silicon. The absence of a boost clock means the processor's frequency never exceeds 1.2 GHz, so performance is predictable but capped. Memory support is limited to DDR1, which restricts memory bandwidth and can become a bottleneck in memory-intensive applications. In synthetic benchmarks, a 1.2 GHz dual-core from this era would typically produce scores in the low thousands, but without actual data, the percentile remains the primary quantitative indicator.

The 50th percentile also suggests that the L2500 is not an outlier. It represents a middle ground between high-end desktop parts and low-power embedded chips. For a low-voltage mobile processor, this is a notable position: it delivers enough performance for basic tasks while maintaining a very low power envelope. The lack of a boost clock and the modest clock speed mean that sustained workloads will run at the same pace as short bursts, which is a characteristic of efficiency-focused designs.

How It Compares

The nearestRivals field is empty, so there are no direct comparison points from the database. However, the percentile rank provides a positional context. Being at the 50th percentile means the L2500 is exactly average among all CPUs in the database. This is significant because the database likely includes many high-performance desktop and server processors, so an average rank indicates that the L2500 is far from the top but also not at the bottom. Its TDP of 9 W places it in the ultra-low-power segment, which typically sacrifices performance for efficiency. Compared to a hypothetical mainstream mobile processor of its generation, the L2500 would have a much lower clock speed and no boost, making it slower in single-threaded tasks. However, its two physical cores allow it to outperform a single-core part of similar clock speed in multi-threaded workloads.

The processor's architecture, codenamed Yonah, was Intel's first dual-core mobile design. The 65 nm process was a significant step from the earlier 90 nm parts, enabling lower power consumption. The L2500's 9 W TDP is exceptionally low, even for its time, and would have been a key selling point for thin-and-light laptops. In the context of the database, the 50th percentile means it is not an outlier; it represents a typical mid-range mobile CPU. The lack of direct rivals in the database suggests that the L2500 is a niche product, but its percentile rank allows for a general comparison to the broader CPU landscape.

Power and Thermals

The L2500 has a TDP of 9 watts, an extremely low figure that defines its thermal profile. This low TDP means the processor can be cooled passively in many chassis, or at most with a small, low-speed fan. The 65 nm process node contributes to this efficiency by reducing leakage currents and switching losses. The socket is Intel Socket 479, which was common for mobile Pentium M and Core Duo parts. The low TDP also implies that the processor can be used in fanless designs, which is beneficial for silent operation and battery life in portable devices.

The integrated graphics are not part of the CPU itself; rather, they are available "on certain motherboards" as a chipset feature. This means the CPU relies on an external GPU or a chipset-integrated GPU, which can affect overall system power and thermal management. The TDP of 9 W does not include the chipset or graphics, so the total system power would be higher. For thermal design, a simple heat sink is sufficient, and the processor's low power dissipation makes it suitable for compact form factors. The 50th percentile performance is achieved within this low power budget, indicating that the L2500 is an efficient performer relative to its thermal envelope.

FAQ

Q: What is the socket type for the Intel Core Duo ULV L2500?

A: It uses Intel Socket 479.

Q: What memory type does the L2500 support?

A: It supports DDR1 memory.

Q: Does the L2500 have integrated graphics?

A: It does not have integrated graphics on the CPU; graphics are available on certain motherboards as a chipset feature.

Q: What is the production status of this processor?

A: It is end-of-life.

Q: When was the L2500 released?

A: It was released on June 27, 2006.

Q: How many cores and threads does it have?

A: It has 2 cores and 2 threads.

Who Should Consider It

Given its low TDP and modest performance, the L2500 is best suited for basic productivity tasks such as word processing, spreadsheet work, and web browsing. The dual cores can handle light multitasking, such as running a few applications simultaneously. However, the 1.2 GHz clock and lack of a boost clock mean that demanding applications, such as modern video editing or 3D rendering, will be severely limited. The 50th percentile ranking suggests it is average among all CPUs, but that average includes many high-performance parts, so in absolute terms its performance is low.

Users who require a low-power, fanless or near-silent system for embedded applications or legacy software may find the L2500 adequate. Its 9 W TDP makes it suitable for passively cooled devices. The DDR1 memory support is a limitation, as it restricts memory bandwidth and capacity compared to modern standards. For office workloads that are not CPU-intensive, the L2500 can deliver acceptable responsiveness, but it is not recommended for content creation or gaming. The lack of a boost clock means there is no headroom for transient performance spikes, so long-running tasks will always run at the base frequency. In a modern context, this processor is best suited for users who prioritize energy efficiency and silence over raw performance.

Single-Thread vs Multi-Thread Behavior

The L2500's single-thread performance is governed by its 1.2 GHz base clock and the absence of a boost clock. With only 64 KB of L1 cache, the processor has limited data locality for individual threads. The 2 MB L2 cache is shared between the two cores, which can help when a single thread accesses a large working set, but the low clock speed caps the rate of instruction execution. In single-threaded workloads, the L2500 will feel sluggish compared to processors with higher clocks or boost capabilities. Tasks such as spreadsheet recalculation or single-threaded scripting will run at a fixed, modest pace.

Multi-threaded performance benefits from having two physical cores, allowing two threads to run in parallel. Since there is no hyper-threading, the processor can handle exactly two threads simultaneously. This is an advantage over single-core parts, but the low clock speed still limits throughput. The 50th percentile ranking likely reflects a balance: in multi-threaded benchmarks, the two cores provide a decent score, while in single-threaded tests, the low clock pulls the average down. For workloads that can use both cores, such as video encoding or scientific simulations that are well-parallelized, the L2500 can outperform a single-core processor with a higher clock, but it will still be far behind modern multi-core processors. In practice, the single-thread vs multi-thread split means that the L2500 is best for tasks that are naturally parallel and not frequency-sensitive, but its overall performance is limited by the low clock and lack of boost. The shared L2 cache also means that multi-threaded applications can benefit from data reuse, but the low memory bandwidth of DDR1 may become a bottleneck in data-heavy workloads.