Intel Atom Z520

Intel Atom Z520 is a single-core, dual-threaded mobile processor from Intel’s Silverthorne generation, built on a 45 nm process with 47 million transistors and a die size of 26 mm². Released in April 2008 and now end-of-life, this chip targets low-power mobile devices, operating at a base clock of 1334.00 MHz with no boost capability. The benchmark data shows no recorded scores for this unit, placing it at the 50th percentile among all CPUs, with an average benchmark score of 0, indicating it sits in the middle of the distribution purely by rank, not by measured performance.

Benchmark Performance

The Intel Atom Z520 has no benchmark scores listed in the database, and its nearestRivals array is empty, meaning there are no direct comparison points from the FACT PACK. Its average benchmark score is 0, which reflects an absence of tested workloads rather than a literal zero-performance result. The 50th percentile ranking is a positional metric, it says that half of all CPUs in the database are below this model and half are above, but with no scores, this is a default placement rather than a computed performance tier.

Because no rival scores or deltaPct values exist, any percentage-based comparison is impossible from the FACT PACK data alone. What the data does show is the hardware foundation: one core, two threads, and a 1334.00 MHz base clock. In the context of its 2008 release, this clock speed was typical for ultra-low-voltage Atom parts, but the absence of benchmark results means the database cannot quantify its compute capability relative to any other processor. The 45 nm process and 47 million transistors suggest a modest transistor budget, consistent with a design focused on energy efficiency over raw throughput.

The empty benchmarks list also implies that no standardized tests (e.g., multi-threaded or single-threaded suites) have been run or recorded for this SKU. For a database user, this means the Z520’s performance profile must be inferred from its architectural parameters, single core, dual threads, no boost, rather than from empirical scores. The 50th percentile is a neutral anchor; it does not indicate that the chip outperforms or underperforms any specific rival, only that its database entry lacks the measured data to move it away from the median.

Single-Thread vs Multi-Thread Behavior

With one physical core and two threads, the Atom Z520 relies on hyper-threading to present two logical processors to the operating system. This configuration means multi-threaded workloads can only overlap two threads on a single execution pipeline, which typically yields limited scaling over single-threaded performance, often in the range of a few percent to maybe 20% in ideal cases, though the FACT PACK provides no such figures. The base clock of 1334.00 MHz applies to both logical threads, and there is no boost clock to dynamically increase frequency under load.

For real workloads, the single-thread vs. multi-thread split is stark: single-threaded tasks will see the full 1334.00 MHz, but any gain from the second thread depends entirely on the efficiency of the core’s shared resources (e.g., execution units, cache). The L1 cache is 56 KB per core, and L2 is 512 KB per core, both small by modern standards but typical for Silverthorne. This limited cache means that multi-threaded applications that thrash shared data could see diminishing returns, while single-threaded latency-sensitive tasks might benefit from the relatively low clock speed’s power savings.

The data shows no boost clock, so frequency is fixed. This makes the Z520 predictable in power draw but also caps its peak performance. In practice, the dual-thread capability is useful for background tasks or lightly threaded OS operations, but heavy parallel workloads would likely saturate the single core quickly. The 2 W TDP (see Power and Thermals) reinforces that this is not a performance-oriented part; its behavior is tuned for sustained low-power operation, where multi-threading offers a modest throughput bump without raising the thermal envelope.

How It Compares

The nearestRivals list is empty in the FACT PACK, so there are no direct competitor names, scores, or deltaPct values to cite. This absence means the Z520 cannot be positioned against any specific CPU in the database, no percentage lead or deficit can be stated. Without rival data, the comparison must rely on its own architectural markers: 1 core, 2 threads, 1334.00 MHz, 45 nm process, and 2 W TDP.

Given the empty rival list, the only contextual anchor is the 50th percentile rank, which is a global placement across all CPUs. That rank, combined with a zero average benchmark score, suggests that the Z520 is neither a standout nor a laggard in the database’s ranking, it is simply unmeasured. For a user seeking a comparison, the data does not support any claim of superiority or inferiority to another named processor. The chip’s end-of-life status and 2008 release further indicate that any modern comparison would be anachronistic.

In the absence of rivals, the analysis must highlight what the Z520 is not: it is not a multi-core powerhouse, not a high-clock part, and not a chip with any boost capability. Its single-core, dual-thread design places it in the ultra-low-power segment, where its 2 W TDP and 45 nm process are the defining features. The database does not provide any other processors in this class, so the comparison is limited to internal characteristics.

FAQ

Q: What is the base clock speed of the Intel Atom Z520?

A: The base clock is 1334.00 MHz, with no boost clock available.

Q: How many cores and threads does the Atom Z520 have?

A: It has 1 core and 2 threads, indicating hyper-threading support on a single physical core.

Q: What is the process node and transistor count?

A: The process node is 45 nm, and the chip contains 47 million transistors on a 26 mm² die.

Q: Does the Atom Z520 have integrated graphics?

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

Q: What is the production status of this processor?

A: It is end-of-life, having been released on 2008-04-01.

Q: What is the TDP and what cooling does it imply?

A: The TDP is 2 W, which implies passive or very small fanless cooling solutions, typical for low-power mobile devices.

Power and Thermals

The Atom Z520 has a thermal design power (TDP) of 2 W, which is exceptionally low, among the lowest in any CPU category. This TDP class implies that the chip can be cooled by passive heatsinks or small, low-speed fans, and it is suited for fanless designs in compact mobile devices. The 45 nm process, while old by modern standards, was a key enabler for this low power draw, as was the modest 47 million transistor count.

The 2 W TDP also means that the motherboard and surrounding components must be designed for minimal power delivery, likely with a simple voltage regulator circuit. The socket is Intel BGA 441, which is a ball-grid array package, soldered directly to the motherboard, not socketed for user replacement. This reinforces the integrated, low-power design philosophy. The absence of a boost clock further caps thermal output, as the chip never exceeds its base 1334.00 MHz frequency.

For cooling, the data suggests that no active cooling is required in most scenarios. A small passive heat spreader or a thin heatpipe attached to the chassis would suffice. The 2 W figure is a design target; actual power draw may vary with workload, but the FACT PACK provides no additional power measurements. Given the end-of-life status and 2008 release, this TDP was competitive in its era for ultra-mobile PCs and netbooks, where battery life and low heat were paramount. The chip’s integrated graphics are a chipset feature, not on-die, which also helps keep the CPU’s thermal footprint minimal.