Intel Core i7-3520M vs Intel Xeon X5492 Comparison

The Intel Xeon X5492 and Intel Core i7-3520M represent two very different design philosophies from Intel, separated by nearly four years and aimed at entirely different market segments. The Xeon is a dual-die server behemoth from the Core 2 era, while the i7 is a power-sipping mobile chip built on a much newer process. Benchmark data reveals that despite their architectural and physical differences, they land in a remarkably close performance class, with the Xeon holding a narrow but consistent lead across all tested Cinebench workloads.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Xeon X5492 has a higher average benchmark score of 852, compared to the Intel Core i7-3520M's average of 843. This places the Xeon just 0.4% ahead of the AMD Athlon X4 830 and 0.5% behind the Intel Core i5-2500T in its nearest rival list.

Q: How do the two chips compare in terms of physical core count?

A: The Xeon X5492 features four physical cores, while the Core i7-3520M has only two. Both processors support four threads total, meaning the i7 uses Hyper-Threading to match the Xeon's thread count.

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

A: The Xeon X5492 scores 349 points in the Cinebench R23 single-core test, while the Core i7-3520M scores 342. This gives the Xeon a 2% advantage in that specific benchmark.

Q: Does the Core i7-3520M have integrated graphics?

A: Yes, the Intel Core i7-3520M includes Intel HD 4000 integrated graphics. The Intel Xeon X5492, by contrast, has no integrated graphics listed in its specifications.

Q: Which processor supports ECC memory?

A: The Intel Xeon X5492 supports ECC memory, which is typical for its server/workstation market segment. The Intel Core i7-3520M does not support ECC memory.

Q: What are the thermal design power (TDP) ratings for each chip?

A: The Xeon X5492 has a TDP of 150 watts, while the Core i7-3520M has a much lower TDP of 35 watts. This reflects the Xeon's server-oriented design versus the i7's mobile efficiency focus.

The Verdict

The data paints a clear picture of two chips that perform nearly identically in synthetic multi-threaded and single-threaded workloads, but for very different reasons. The Intel Xeon X5492 wins all five head-to-head benchmark comparisons, but its victory margins are slim, ranging from 2% to 2.1%. The largest delta is in Cinebench R20 multi-core, where the Xeon scores 1039 against the i7's 1018, a 2.1% edge. In single-core R20, the Xeon leads 146 to 143, also a 2.1% difference.

For a system builder targeting a server or workstation environment with a Socket 771 platform, the Xeon X5492 is the stronger pick based purely on benchmark results and its ECC memory support. Its 150-watt TDP and lack of integrated graphics are non-issues in that context, where dedicated cooling and discrete GPUs are standard. The Xeon also holds a 23rd percentile ranking among all CPUs, identical to the i7, indicating they sit at the same overall performance tier despite their different designs.

For mobile or compact systems, the Intel Core i7-3520M is the only sensible choice from this pairing, despite losing every benchmark. Its 35-watt TDP makes it suitable for laptops, and the integrated Intel HD 4000 graphics eliminate the need for a separate GPU. The i7's boost clock of 3.60 GHz, compared to the Xeon's fixed 3.40 GHz, suggests it can reach higher peak frequencies when thermals allow, though the Cinebench data shows the Xeon still edges ahead in sustained workloads. The i7 also benefits from a much newer 22 nm process node versus the Xeon's 45 nm node, which contributes to its efficiency. Ultimately, the Xeon is the raw performance winner, but the i7 is the only option for power-constrained applications.

Head-to-Head Benchmarks

The benchmark results are remarkably consistent across all five Cinebench tests, with the Intel Xeon X5492 taking a narrow victory in every single one. Starting with Cinebench R15 multi-core, the Xeon scores 249 against the i7-3520M's 244, a 2% win. The pattern repeats in Cinebench R20 multi-core, where the Xeon posts 1039 versus 1018, extending the margin slightly to 2.1%.

Single-core tests tell the same story. In Cinebench R20 single-core, the Xeon scores 146 and the i7 scores 143, a 2.1% advantage for the older chip. Cinebench R23 single-core sees the Xeon at 349 and the i7 at 342, a 2% lead. The final head-to-head test, Cinebench R23 multi-core, shows the Xeon at 2475 and the i7 at 2426, again a 2% margin.

These deltas are small enough that they could be considered within run-to-run variance in real-world usage, but the consistency across all five tests suggests the Xeon holds a genuine, if modest, performance edge. Notably, the i7-3520M's nearest rival list includes the Intel Xeon X5470, another Harpertown server chip, with the i7 scoring 0.4% higher. This places the mobile i7 essentially on par with a previous-generation Xeon, which contextualizes the X5492's lead. The X5492 itself sits 0.4% below the Intel Core i5-5250U and 0.8% below the Intel Core i7-4500U, indicating that its performance is comparable to low-voltage mobile chips from a much later era. Given that the Xeon achieves this with four physical cores and a 150-watt TDP, while the i7-3520M uses two cores and 35 watts, the efficiency gap is stark.

Specification Differences

The two processors diverge sharply on almost every physical and electrical specification. The Intel Xeon X5492 uses the Intel Socket 771, while the Intel Core i7-3520M uses Intel BGA 1023, which is a soldered mobile package. The Xeon has a base clock of 3.40 GHz with no boost clock listed, whereas the i7 has a lower base of 2.90 GHz but a boost clock of 3.60 GHz. This means the i7 has a higher maximum frequency when thermally boosted, yet it still loses in single-core benchmarks.

TDP is the most dramatic difference: the Xeon consumes 150 watts, while the i7 consumes just 35 watts. The Xeon is built on a 45 nm process node and contains 820 million transistors spread across a die size of 2x 107 mm². The i7 uses a 22 nm process and has a die size of 118 mm². The Xeon's cache hierarchy includes 64 KB of L1 per core and 6 MB of L2 per die, with no L3 cache. The i7 has 64 KB of L1 per core, 256 KB of L2 per core, and 4 MB of shared L3 cache. Both support dual-channel memory, but the Xeon supports DDR2 and DDR3, while the i7's memory support is not listed in the data.

ECC memory is supported only on the Xeon, which is expected for its server/workstation market segment. The i7 targets the mobile segment and includes integrated graphics, which the Xeon lacks. The Xeon supports PCIe Gen 2, while the i7's PCIe generation is not specified. The Xeon was released in September 2008 with a launch MSRP of $1493, while the i7 was released in June 2012 and has no launch MSRP listed. The Xeon is marked as end-of-life, and its part number is SLBBD; the i7's part number is SR0MU. Neither chip has an unlocked multiplier.

Architecture Differences

The architectural gap between these two chips is fundamental. The Intel Xeon X5492 is built on the Core 2 architecture with the codename Harpertown, representing the last generation of Intel's Core 2 microarchitecture before the Core i-series took over. It uses a 45 nm process node, which was modern in 2008 but is now several generations old. The chip is physically composed of two dies, each measuring 107 mm², giving a combined die size of 2x 107 mm² and housing 820 million transistors. The cache layout reflects this dual-die design: each die has 6 MB of L2 cache, and there is no shared L3 cache. This means the four cores are split across two dies, with communication between dies occurring over the front-side bus architecture of the Socket 771 platform.

The Intel Core i7-3520M, in contrast, uses the Ivy Bridge architecture, a 22 nm design that is a direct descendant of the original Core i7 (Nehalem) and later Sandy Bridge. It is a monolithic die measuring 118 mm², which is actually smaller than one of the Xeon's dies despite containing more modern logic. The i7 has a more sophisticated cache hierarchy with 256 KB of L2 per core and 4 MB of shared L3 cache, allowing all cores to access a common pool of fast memory. The 22 nm process node provides significant transistor density and power efficiency improvements over the Xeon's 45 nm node, which explains the massive TDP disparity (35 watts versus 150 watts) despite comparable benchmark scores.

The i7 also supports Hyper-Threading, enabling two threads per core, which is how it achieves four threads from two physical cores. The Xeon, with four physical cores and four threads, does not use Hyper-Threading. The i7's integrated Intel HD 4000 graphics further differentiate it architecturally, as the Xeon has no graphics capability at all. The Xeon's support for ECC memory and its server-oriented PCIe Gen 2 connectivity highlight its workstation pedigree. The i7's lack of ECC support and unspecified PCIe generation underscore its consumer mobile focus. These architectural differences explain why two chips with nearly identical benchmark scores are suited for entirely different use cases: the Xeon for multi-socket server farms where raw throughput per socket matters, and the i7 for thin-and-light laptops where every watt counts.