Intel Core i5-2557M

The Intel Core i5-2557M is a dual-core mobile processor from the Sandy Bridge generation, launched in 2011 for thin-and-light laptops. With an average benchmark score of 505, it sits at the 9th percentile of all CPUs, indicating performance well below modern desktop and even mainstream laptop parts. Its 17W thermal design power (TDP) class defines it as an ultra-low-power chip, prioritizing battery life over raw compute. The data shows a part that was modest even at release, and today it is firmly an entry-level or legacy option.

Benchmark Performance

Benchmark results place the Core i5-2557M in a narrow performance band, with its average score of 505 nearly identical to its closest rivals. In Cinebench R23, the chip scores 1381 in multi-core and 195 in single-core. The multi-core figure is about 7 times the single-core score, reflecting the limited parallelism of just two physical cores with four threads. Geekbench results show a similar pattern: 776 multi-core and 382 single-core, a ratio of roughly 2:1, which is typical for a dual-core part with Hyper-Threading.

The Cinebench R20 scores highlight the generational gap. The multi-core result of 580 and single-core of 81 are both low by any modern standard, but they are internally consistent with the R23 numbers—the R23 multi-core score is about 2.4 times the R20 figure, while the single-core scores scale at a similar rate. Cinebench R15 multi-core completes the picture at 139, which is roughly a quarter of the R20 multi-core score.

Against its nearest rivals, the Core i5-2557M is essentially tied. It is 0.1% ahead of the AMD Phenom II X4 900e and 0.4% ahead of the AMD Athlon II X3 440, while trailing the Intel Xeon L5335 by 0.5% and the Intel Core i3-2100T by 0.7%. These deltas are within noise, meaning that for any given workload, the results would be statistically indistinguishable across these four processors. The 9th percentile ranking underscores this: the chip outperforms only about 9% of all CPUs in the benchmark database, leaving it far behind mainstream desktop parts from the same era.

Platform and Compatibility

The Core i5-2557M uses the Intel BGA 1023 socket, which means it is soldered directly to the motherboard. This has immediate upgrade implications: the processor cannot be swapped out by an end-user, so any system built around it is locked to this specific CPU. The architecture is Sandy Bridge, built on Intel’s 32 nm process node, with 624 million transistors packed into a 149 mm² die.

Memory support is limited to DDR3 in a dual-channel configuration. There is no ECC memory support, which is expected for a mobile consumer chip. The integrated graphics are Intel HD 3000, a Sandy Bridge-era GPU that was adequate for basic display output and light media playback but not for gaming or GPU-accelerated workloads. The PCIe support is not specified in the data, so any claims about lane counts or versions would be speculative. The production status is end-of-life, and the release date is May 31, 2011, making this a part that has been obsolete for over a decade.

The upgrade path for this platform is effectively non-existent. BGA soldering eliminates CPU replacement, and the DDR3 memory standard is outdated. A user with such a system would need to replace the entire laptop or motherboard to gain any meaningful performance improvement. The dual-channel memory bus does provide a modest advantage over single-channel designs, but with only two cores and a low base clock, the memory bandwidth is not a bottleneck in most workloads.

Power and Thermals

The thermal design power (TDP) of 17W is the defining characteristic of this chip. This is an ultra-low-power part, designed for slim laptops where cooling is minimal and battery life is paramount. A 17W TDP means that a simple passive or low-speed fan cooler is sufficient, and the chip will not generate significant heat under sustained load. This is in stark contrast to desktop processors of the same era, which typically had TDPs in the 65W to 95W range.

The base clock of 1700 MHz is low, and there is no boost clock listed in the data. This means the chip runs at a fixed frequency, which limits its ability to ramp up under short bursts of activity. For a 17W part, this is a deliberate trade-off: lower clocks reduce power draw and heat, but also cap peak performance. The integrated Intel HD 3000 GPU shares the same thermal budget, so any graphics workload will consume part of the 17W envelope, further reducing CPU performance under combined load.

The cooling tier implied by 17W is minimal. A thin heat pipe and a small fan are more than adequate, and many designs could run fanless at reduced loads. This makes the chip well-suited for ultrabooks and other portable form factors, but it also means that sustained multi-core workloads will cause the CPU to operate at its thermal limit without any headroom for boost behavior. The absence of a boost clock reinforces this: the chip is always at 1700 MHz, never higher.

How It Compares

AMD Phenom II X4 900e: The Core i5-2557M is 0.1% ahead of this quad-core AMD part in average benchmark score. Despite having two fewer physical cores, the Intel chip matches the Phenom II X4 900e, which is a testament to Sandy Bridge’s superior per-core efficiency. However, the Phenom II X4 900e would likely pull ahead in heavily threaded workloads that can use all four cores, even if the average scores are tied.

AMD Athlon II X3 440: The Intel chip leads this triple-core AMD processor by 0.4%. The Athlon II X3 440 has one more core but lacks the Hyper-Threading that the Core i5-2557M uses to reach four threads. The near-identical average scores suggest that the Intel chip’s higher IPC (instructions per clock) offsets the core count disadvantage. In single-threaded tasks, the Intel part would be clearly faster, while multi-threaded scenarios are a toss-up.

Intel Xeon L5335: The Core i5-2557M trails this server-oriented Xeon by 0.5%. The L5335 is an older architecture (Core 2-based) but has four physical cores. The margin is tiny, and the two chips are effectively equal in overall performance. However, the Xeon L5335 would likely excel in multi-threaded workloads, while the Core i5-2557M has the edge in single-threaded efficiency due to its newer architecture.

Intel Core i3-2100T: The Core i5-2557M is 0.7% behind this desktop dual-core i3. The i3-2100T has a higher base clock and a larger thermal budget (35W vs. 17W), yet the performance difference is negligible. This shows that the Core i5-2557M is remarkably efficient for its power class, but it also highlights that the 17W limit does not cost much performance relative to a similarly clocked 35W part.

Who Should Consider It

The Core i5-2557M is not a processor for demanding users. Its Cinebench R23 multi-core score of 1381 and single-core score of 195 place it far below anything that could handle modern gaming, video editing, or 3D rendering. Gaming is out of the question for any title released after 2015, as the integrated HD 3000 GPU and dual-core CPU lack the necessary compute power. Even older games from the early 2010s would run at low settings and resolutions.

For office productivity, the chip is borderline adequate. Web browsing with a few tabs, word processing, and spreadsheet work are possible, but the 1700 MHz base clock means that even these tasks can feel sluggish, especially with modern JavaScript-heavy websites. The 9th percentile ranking confirms that this CPU is slower than 91% of all processors in the database, so any workload that requires consistent responsiveness will suffer.

Creation workloads are not feasible. Video encoding, photo editing in RAW format, or compiling code would take an extremely long time, and the lack of a boost clock means there is no escape from the low frequency. The only viable use case is as a basic web terminal or a dedicated machine for legacy software that does not require much CPU power. For someone with an old laptop using this chip, the recommendation is to replace it, not to upgrade it.

FAQ

Q: What is the average benchmark score of the Intel Core i5-2557M?

A: The average benchmark score is 505, placing it at the 9th percentile of all CPUs.

Q: How does it compare to the AMD Phenom II X4 900e?

A: The Core i5-2557M is 0.1% ahead of the Phenom II X4 900e in average score, with both chips effectively tied at 505 vs. 505.

Q: What is the TDP of this processor?

A: The thermal design power is 17W, which is an ultra-low-power classification suitable for thin laptops.

Q: Does it support ECC memory?

A: No, ECC memory is not supported. The chip uses DDR3 memory in a dual-channel configuration.

Q: Can the CPU be upgraded?

A: No, it uses the Intel BGA 1023 socket, which is soldered to the motherboard, preventing any user-level upgrade.

Q: What is the single-core performance in Cinebench R23?

A: The single-core score in Cinebench R23 is 195, while the multi-core score is 1381.

Single-Thread vs Multi-Thread Behavior

The Core i5-2557M exhibits a single-thread to multi-thread ratio that is typical for a dual-core part with Hyper-Threading. In Cinebench R23, the multi-core score of 1381 is 7.1 times the single-core score of 195. This is a higher ratio than would be expected from a pure dual-core without Hyper-Threading, which would typically show a ratio of around 2.0. The 7.1x ratio suggests that the benchmark is able to scale well across the four threads, but the absolute numbers are so low that the scaling provides little practical benefit.

In Geekbench, the multi-core score of 776 is 2.0 times the single-core score of 382, which is the expected scaling for two cores with two threads each. The discrepancy between the Cinebench and Geekbench ratios likely reflects differences in how each benchmark handles thread scheduling and memory latency. For real-world workloads, the single-thread performance is the more critical metric, as most everyday applications are not heavily multi-threaded. A single-core score of 195 in Cinebench R23 is exceptionally low, meaning that even opening a large document or navigating a complex website will feel unresponsive.

The multi-thread behavior is equally constrained. While the chip can technically process four threads, the 1700 MHz base clock and 17W power limit mean that sustained multi-core loads will cause the CPU to throttle or run at maximum temperature. The data shows no boost clock, so there is no transient performance spike to handle short bursts of activity. This makes the chip poorly suited for any task that requires consistent multi-threaded throughput, such as background rendering or file compression. The 9th percentile ranking across all CPUs confirms that both single and multi-thread performance are in the bottom decile, making this a processor that is only suitable for the lightest of computing tasks.