Intel Core M-5Y51

Launched in late 2014 on Intel's 14 nm Broadwell-Y process, the Core M-5Y51 is a 2-core, 4-thread mobile processor with a 5 W TDP and a 50 mm² die size. Its average benchmark score of 593 places it at the 13th percentile of all CPUs in the database, indicating a part designed for extreme efficiency rather than raw throughput. The following analysis examines its benchmark results, workload behavior, competitive positioning, and thermal implications based strictly on the data provided.

Benchmark Performance

The Core M-5Y51's benchmark results show a consistent pattern across Cinebench versions, with the multicore scores scaling predictably with each iteration of the renderer. In Cinebench R15 multicore, the chip scores 173 points; in R20 multicore, it reaches 724 points; and in R23 multicore, it produces 1,725 points. These figures represent the absolute performance envelope of the part, and the progression between versions reflects the increased workload complexity of each successive Cinebench release rather than any change in processor behavior.

The single-core scores tell a similar story: 102 points in Cinebench R20 single-core and 243 points in Cinebench R23 single-core. When placed against the 13th percentile ranking, these numbers confirm that the Core M-5Y51 sits firmly in the entry-level performance tier. The average benchmark score of 593 exactly matches three of its nearest rivals — the AMD Athlon II X4 620, the Intel Core i3-2102, and the Intel Core i5-580M — all of which also average 593. This exact parity indicates that despite very different architectures, process nodes, and release timelines, these four processors deliver effectively identical aggregate performance in the benchmark suite used here.

The only rival with a different score is the Intel Xeon E5410, which averages 594 points, representing a 0.2% advantage over the Core M-5Y51. This delta is negligible in real-world terms, falling well within run-to-run variance for most benchmark workloads. The data shows that the Core M-5Y51 is not a performance outlier in either direction — it sits precisely at the midpoint of its competitive cluster, with no rival exceeding it by more than 0.2% and none falling below it at all. This suggests that the processor's design goals were entirely focused on power efficiency rather than benchmark leadership, and the numbers bear this out.

Single-Thread vs Multi-Thread Behavior

The ratio between single-thread and multi-thread scores reveals the Core M-5Y51's scaling efficiency. In Cinebench R20, the multicore score of 724 is 7.1 times the single-core score of 102. In Cinebench R23, the multicore score of 1,725 is 7.1 times the single-core score of 243. This consistent 7.1x multiplier across two different Cinebench versions is notable because the processor has only 2 physical cores and 4 threads. Perfect linear scaling with 4 threads would yield a 4.0x multiplier, so the observed 7.1x ratio appears anomalous at first glance.

The explanation lies in the benchmark methodology: the single-core scores are measured under sustained load conditions that include the processor's thermal and power constraints, while the multicore tests benefit from the processor's ability to distribute load across all available threads. The 7.1x ratio suggests that the single-core Cinebench runs do not fully exploit the boost clock of 2.60 GHz, likely due to the 5 W TDP envelope limiting sustained single-core frequency. In contrast, the multicore test may allow the processor to utilize a more balanced power distribution across both cores, resulting in disproportionately higher aggregate throughput.

For real-world workloads, this behavior means that lightly threaded tasks — such as web browsing, document editing, or basic productivity applications — will see performance limited by the single-core ceiling of 102-243 Cinebench points. Heavily threaded workloads, such as video encoding or 3D rendering, will scale better relative to the single-core baseline, but the absolute multicore scores of 724-1,725 points remain low by modern standards. The data indicates a processor that delivers acceptable responsiveness for bursty, single-threaded tasks but will struggle with sustained multi-threaded workloads due to the fundamental power constraints of the 5 W design.

How It Compares

vs AMD Athlon II X4 620: The Athlon II X4 620 matches the Core M-5Y51 exactly with an average score of 593 and a 0% delta. This is a remarkable result given the architectural differences: the Athlon II is a quad-core desktop part from an earlier era, while the Core M-5Y51 is a dual-core mobile chip with integrated graphics. The parity suggests that the Core M-5Y51's superior IPC from the Broadwell architecture and higher boost clock compensate for the Athlon's two additional physical cores. For a mobile processor to equal a desktop quad-core from the same era is a testament to architectural efficiency.

vs Intel Core i3-2102: The Core i3-2102 also matches at 593 points with a 0% delta. The i3-2102 is a desktop dual-core with Hyper-Threading, just like the Core M-5Y51, but it operates at significantly higher clock speeds in a much larger thermal envelope. The fact that the Core M-5Y51 ties this desktop part — despite a 5 W TDP versus a desktop-class power budget — highlights how far process technology and microarchitecture had advanced by the Broadwell generation. Both parts deliver identical aggregate performance, but the Core M-5Y51 does so at a fraction of the power.

vs Intel Core i5-580M: The Core i5-580M completes the trio of exact matches at 593 points with a 0% delta. The i5-580M is a mobile dual-core from the Arrandale generation, released several years earlier. It features a higher base clock and a larger thermal envelope than the Core M-5Y51, yet the benchmark data shows no performance advantage. This indicates that the Core M-5Y51's newer architecture and higher boost clock of 2.60 GHz fully compensate for the older chip's clock speed advantage. The 0% delta is a clear signal that generational IPC improvements have neutralized the older part's frequency lead.

vs Intel Xeon E5410: The Xeon E5410 is the only rival that leads the Core M-5Y51, with an average score of 594 and a delta of -0.2% for the Core M-5Y51. This is a server-class quad-core processor from the Penryn generation, and its advantage is minuscule — less than one point in a 593-594 scale. The 0.2% deficit is statistically insignificant and would be imperceptible in any real application. The data shows that the Core M-5Y51 effectively holds its own against a server chip with twice the core count, which underscores the efficiency of the Broadwell architecture.

FAQ

Q: What is the Core M-5Y51's average benchmark score relative to all CPUs?

A: The Core M-5Y51 has an average benchmark score of 593, placing it at the 13th percentile of all CPUs in the database.

Q: How does the Core M-5Y51 compare to the AMD Athlon II X4 620?

A: The two processors have identical average scores of 593, resulting in a 0% performance delta.

Q: What is the difference between the Core M-5Y51 and the Intel Xeon E5410?

A: The Xeon E5410 averages 594 points, which is 0.2% higher than the Core M-5Y51's 593 points.

Q: What are the Cinebench R23 results for the Core M-5Y51?

A: In Cinebench R23, the processor scores 1,725 points in multicore and 243 points in single-core.

Q: How many cores and threads does the Core M-5Y51 have?

A: The processor has 2 cores and 4 threads, with a base clock of 1.10 GHz and a boost clock of 2.60 GHz.

Q: What is the cache configuration of the Core M-5Y51?

A: It features 64 KB of L1 cache per core, 256 KB of L2 cache per core, and 4 MB of shared L3 cache.

Power and Thermals

The Core M-5Y51 is defined by its 5 W TDP, which is the most distinctive specification in the entire fact pack. This thermal design power is exceptionally low for a dual-core processor with 4 threads, and it directly explains the benchmark results observed across all tests. The 14 nm process node from Intel enables this level of efficiency, and the 50 mm² die size reflects the compact, power-optimized design. The processor is built for the Intel BGA 1234 socket, indicating a soldered, non-upgradeable mobile platform.

The thermal implications of a 5 W TDP are straightforward: the Core M-5Y51 can be cooled by a passive heatsink in a fanless chassis, or by the smallest active cooling solutions available. This makes the processor suitable for ultra-thin laptops, tablets, and passively cooled devices where traditional cooling towers and fans are impossible. The benchmark data confirms that this power constraint is the primary limiter of performance — the architecture is capable of higher throughput, but the 5 W envelope caps both single-core boost frequencies and sustained multi-core operation.

Given the 13th percentile ranking and the exact parity with older desktop and server parts, the Core M-5Y51's performance class is best understood as "fanless-capable efficiency." The 5 W TDP implies that any cooling solution — from a thin heat pipe to a small aluminum heatsink — is sufficient to prevent thermal throttling under sustained load. The data does not indicate any thermal headroom for overclocking, and the multiplier is locked, so the 2.60 GHz boost clock represents the maximum achievable frequency under any conditions. For system integrators, the 5 W TDP means no active cooling is strictly required, but including a low-speed fan would allow the processor to maintain boost clocks for longer durations in warm environments.