CPU Comparison

The Intel Core i7-3540M and Intel Xeon W3520 represent two very different philosophies from Intel’s lineup: a 22nm dual-core mobile chip with integrated graphics versus a 45nm quad-core server/workstation part with ECC memory support. Despite their contrasting designs, the benchmark data reveals a remarkably close contest, with the mobile i7 winning all five head-to-head tests by margins under 1%. This near-parity in synthetic workloads makes the choice between them less about raw performance and more about platform capabilities, power characteristics, and intended use case.

Where Each One Wins

The data shows a clean sweep for the Intel Core i7-3540M across every shared benchmark, but the margins are razor-thin. In Cinebench R15 multicore, the i7-3540M scores 254 against the Xeon W3520’s 252, a delta of just 0.8%. The pattern repeats in Cinebench R20 multicore (1060 vs 1052, +0.8%) and Cinebench R23 multicore (2525 vs 2505, +0.8%). The single-core tests tell the same story: the i7-3540M leads by 0.7% in Cinebench R20 single-core (149 vs 148) and by 0.8% in Cinebench R23 single-core (356 vs 353). The i7-3540M also holds a Geekbench multicore score of 1160 and a single-core score of 565, though the Xeon W3520 lacks comparable Geekbench entries in this dataset.

Where the Xeon W3520 could be argued to “win” is in structural capacity rather than measured speed. With 4 cores and 8 threads versus the i7-3540M’s 2 cores and 4 threads, the Xeon has double the physical core count. The Xeon also supports triple-channel DDR3 memory and ECC memory, features absent from the i7-3540M. However, the benchmark results indicate that these architectural advantages do not translate into higher scores in the tested Cinebench workloads. The i7-3540M’s higher base clock of 3.00 GHz versus 2.67 GHz, and boost clock of 3.70 GHz versus 2.93 GHz, appear to compensate fully for the core deficit in these specific tests.

Architecture Differences

The architectural gap between these two processors is substantial. The i7-3540M is built on Ivy Bridge, a 22nm process with a die size of 118 mm², while the Xeon W3520 uses Nehalem (Bloomfield) on a 45nm node with a 263 mm² die and 731 million transistors. This process advantage explains why the i7-3540M achieves comparable or better scores despite having half the cores, each core is more efficient and runs at higher clocks.

Cache configurations also differ meaningfully. Both share 64 KB L1 and 256 KB L2 per core, but the Xeon W3520 has 8 MB of shared L3 cache versus the i7-3540M’s 4 MB. The larger L3 cache on the Xeon should theoretically help with multi-threaded workloads, yet the benchmark data shows no such benefit in these tests. The i7-3540M includes integrated Intel HD 4000 graphics, while the Xeon W3520 has no integrated GPU, requiring a discrete graphics card. The i7-3540M uses dual-channel memory while the Xeon W3520 uses triple-channel, and the Xeon supports ECC memory while the i7 does not.

The power envelope is a stark differentiator: the i7-3540M has a TDP of 35 watts versus the Xeon W3520’s 130 watts. The mobile chip’s socket is Intel Socket G2 (988B), whereas the Xeon uses Intel Socket 1366. The Xeon is marked as end-of-life production status, while the i7-3540M’s status is not specified in the data. The i7-3540M released in January 2013; the Xeon W3520 came earlier, in March 2009.

Head-to-Head Benchmarks

The five head-to-head tests all result in wins for the i7-3540M, but the margins are so consistent that they suggest measurement noise rather than a true performance gap. In Cinebench R15 multicore, the i7-3540M scores 254 versus 252, a 0.8% difference. Cinebench R20 multicore shows 1060 versus 1052, again a 0.8% lead. The single-core tests are similarly tight: Cinebench R20 single-core shows 149 versus 148 (+0.7%), and Cinebench R23 single-core shows 356 versus 353 (+0.8%). Cinebench R23 multicore completes the sweep at 2525 versus 2505 (+0.8%).

The average benchmark scores from the broader dataset confirm this proximity: the i7-3540M averages 867 points, while the Xeon W3520 averages 862 points. Both processors sit at the 23rd percentile among all CPUs, indicating they occupy the same performance tier overall. The nearest rivals for the i7-3540M include the Intel Xeon X3460 (866 points, +0.1%) and Intel Core i5-3470T (863 points, +0.4%), while the Xeon W3520’s nearest rivals include the AMD A8-7650K (860 points, +0.2%) and Intel Core i7-4500U (859 points, +0.3%). Notably, the Xeon X3460 appears in both lists, placing between the two contenders in average score.

The Verdict

The data presents a nuanced picture. For users prioritizing raw benchmark scores in Cinebench workloads, the Intel Core i7-3540M is the clear choice, it wins all five head-to-head tests, albeit by margins under 1%. Its 35-watt TDP makes it dramatically more power-efficient than the Xeon W3520’s 130-watt envelope, which is a decisive factor for any mobile or compact system. The integrated HD 4000 graphics eliminate the need for a separate GPU in basic display tasks.

However, the Xeon W3520 offers capabilities the i7-3540M cannot match. Its 4 cores and 8 threads provide double the physical core count, which could benefit workloads not captured in the tested Cinebench suite, particularly heavily parallel tasks that scale beyond what these synthetic tests reveal. The triple-channel memory bus and ECC memory support make it suitable for server or workstation environments where data integrity is paramount. The larger 8 MB L3 cache may also help in certain data-intensive scenarios.

The production status difference is notable: the Xeon W3520 is listed as end-of-life, while the i7-3540M’s status is unspecified. This suggests the Xeon may be harder to source new, while the i7-3540M remains a viable mobile option. Users choosing between these two should weigh the i7-3540M’s superior benchmark performance, lower power draw, and integrated graphics against the Xeon W3520’s higher core count, ECC support, and triple-channel memory. For general-purpose computing with an emphasis on efficiency, the i7-3540M wins on the data. For specialized server workloads requiring ECC and maximum core parallelism, the Xeon W3520’s feature set may prove more valuable despite losing in these specific tests.

FAQ

Q: Which processor has better multi-core performance?

A: The Intel Core i7-3540M wins all multi-core Cinebench tests, scoring 254 in R15, 1060 in R20, and 2525 in R23, versus the Xeon W3520’s 252, 1052, and 2505 respectively, a consistent 0.8% lead.

Q: Does the Xeon W3520 have more cores than the i7-3540M?

A: Yes, the Xeon W3520 has 4 cores and 8 threads, while the i7-3540M has 2 cores and 4 threads.

Q: Can the i7-3540M use ECC memory?

A: No, the i7-3540M does not support ECC memory. The Xeon W3520 supports ECC memory, which is a key differentiator for server workloads.

Q: What are the TDP differences between these two chips?

A: The i7-3540M has a TDP of 35 watts, while the Xeon W3520 has a TDP of 130 watts, a significant difference favoring the mobile chip.

Q: Which processor has integrated graphics?

A: Only the i7-3540M has integrated graphics (Intel HD 4000). The Xeon W3520 has no integrated GPU, requiring a discrete graphics card.

Q: What are the average benchmark scores for each?

A: The i7-3540M has an average benchmark score of 867, while the Xeon W3520 averages 862, placing both at the 23rd percentile among all CPUs.

Specification Differences

| Specification | Intel Core i7-3540M | Intel Xeon W3520 |

|---|---|---|

| Cores | 2 | 4 |

| Threads | 4 | 8 |

| Base Clock | 3.00 GHz | 2.67 GHz |

| Boost Clock | 3.70 GHz | 2.93 GHz |

| TDP | 35 W | 130 W |

| Socket | Intel Socket G2 (988B) | Intel Socket 1366 |

| Architecture | Ivy Bridge | Nehalem |

| Codename | Ivy Bridge | Bloomfield |

| Process Node | 22 nm | 45 nm |

| Die Size | 118 mm² | 263 mm² |

| Transistors | Not specified | 731 million |

| L3 Cache | 4 MB (shared) | 8 MB (shared) |

| Memory Bus | Dual-channel | Triple-channel |

| ECC Memory | No | Yes |

| PCIe | Not specified | Gen 2 |

| Integrated Graphics | Intel HD 4000 | None |

| Market Segment | Mobile | Server/Workstation |

| Production Status | Not specified | End-of-life |

| Release Date | 2013-01-07 | 2009-03-29 |