Intel Core i7-3520M vs Intel Xeon X3450 Comparison

The Intel Core i7-3520M and the Intel Xeon X3450 represent two very different approaches to computing, separated by process technology, intended market, and physical design. The data shows a remarkably close contest in raw processing power, but the path each takes to get there could not be more different. The Xeon X3450, a server/workstation part from 2009, edges out the mobile Core i7-3520M in every single benchmark recorded, yet the margins are so thin that the results might as well be a tie. This analysis breaks down the numbers to see what each chip actually offers.

Head-to-Head Benchmarks

The benchmark results are unusually tight. In the Cinebench R15 multicore test, the Intel Xeon X3450 scores 245 against the Intel Core i7-3520M’s 244, a win for the Xeon by a mere 0.4%. This pattern repeats in Cinebench R20 multicore, where the Xeon posts 1021 versus the i7’s 1018, a 0.3% difference. The single-core results are equally close: in Cinebench R20 single-core, the Xeon leads 144 to 143, a 0.7% advantage. The Cinebench R23 tests follow suit, with the Xeon winning multicore 2431 to 2426 (0.2%) and single-core 343 to 342 (0.3%). Across all five head-to-head tests, the Xeon X3450 takes the win, but the largest margin is under one percent.

What makes this fascinating is the hardware behind the scores. The Xeon X3450 has double the cores (4 versus 2) and double the threads (8 versus 4) compared to the Core i7-3520M. It also has twice the L3 cache, with 8 MB shared versus 4 MB shared. Despite this overwhelming hardware advantage on paper, the Xeon only manages to edge out the i7 by fractions of a point. The i7-3520M’s newer 22 nm Ivy Bridge architecture and higher clock speeds (2.90 GHz base, 3.60 GHz boost versus 2.67 GHz base, 3.20 GHz boost) clearly compensate for its missing cores. The i7 also has a significantly lower TDP of 35 watts, compared to the Xeon’s 95 watts, meaning it achieves near-parity while consuming less than half the power budget.

Looking at the broader benchmark picture, the average benchmark score for the i7-3520M is 843, placing it in the 23rd percentile of all CPUs. The Xeon X3450 averages 837, right behind in the 22nd percentile. The i7’s nearest rivals include the AMD FX-8800P at 843 (a 0.1% delta) and the Intel Core i7-920 at 840 (0.3% delta). The Xeon’s nearest rivals include the Intel Core i5-5200U at 838 (-0.1% delta) and the Intel Core i5-3380M at 838 (-0.2% delta). Interestingly, the Intel Core i5-3380M appears as a rival to both chips, scoring 838, which sits between the two in average performance. This suggests that in real-world aggregate performance, these two CPUs are effectively interchangeable.

The Verdict

From the data, the Intel Xeon X3450 is the faster processor in every recorded test. If the only criterion is raw benchmark scores, the Xeon wins, but the margins are so small that they would be imperceptible in daily use. The Xeon’s 0.4% lead in Cinebench R15 and 0.3% lead in Cinebench R23 multicore are within run-to-run variance. The Xeon’s single-core wins are similarly negligible, with a 0.7% advantage in R20 single-core being the largest gap recorded.

The real decision comes down to context. The i7-3520M is a mobile chip on the Intel BGA 1023 socket, drawing 35 watts. It has integrated graphics (Intel HD 4000), making it a self-contained solution for a laptop. The Xeon X3450 is a server/workstation chip on Intel Socket 1156, drawing 95 watts. It requires a discrete graphics card, as it has no integrated graphics, but it supports ECC memory. For a builder assembling a low-power, compact mobile system, the i7-3520M is the obvious choice. For someone building a legacy server or workstation with ECC memory support, the Xeon X3450 is the pick, even if its performance advantage is negligible.

The data does not support a strong performance-based recommendation for either. The i7-3520M is the more efficient and modern part, while the Xeon X3450 offers ECC memory and more physical cores. If you need ECC, the Xeon is the only option. If you need integrated graphics and low power, the i7 is the only option. On pure performance, flip a coin; the benchmarks say they are equal.

Architecture Differences

The two processors come from different eras and design philosophies. The Intel Core i7-3520M is built on the 22 nm process node using the Ivy Bridge architecture, while the Intel Xeon X3450 uses the 45 nm node with the Nehalem architecture (codename Lynnfield). This process gap explains the massive difference in die size and power consumption. The i7-3520M has a die size of 118 mm², while the Xeon X3450’s die is 296 mm². The Xeon also packs 774 million transistors, a figure not listed for the i7.

The core configurations differ significantly. The i7-3520M has 2 cores and 4 threads, while the Xeon X3450 has 4 cores and 8 threads. Both use a dual-channel memory bus, but the Xeon supports DDR3 memory with a bandwidth of 21.3 GB/s and has ECC memory support. The i7-3520M does not list memory support or bandwidth in the data, and it does not support ECC memory. The Xeon also has PCIe Gen 2 with 16 lanes (CPU only), while the i7’s PCIe configuration is not listed.

The i7-3520M includes integrated Intel HD 4000 graphics, which the Xeon lacks entirely. The i7 is a mobile part, while the Xeon is a server/workstation part. The Xeon’s production status is listed as end-of-life, while the i7’s status is not specified. Both have locked multipliers, so neither is unlocked for overclocking. The i7 was released on 2012-06-02, while the Xeon was released earlier on 2009-09-07.

FAQ

Q: Which CPU has more cores?

A: The Intel Xeon X3450 has 4 cores and 8 threads, while the Intel Core i7-3520M has 2 cores and 4 threads.

Q: Is the Intel Core i7-3520M faster than the Xeon X3450 in any benchmark?

A: No. The Xeon X3450 wins all five head-to-head benchmarks, with the closest margin being 0.2% in Cinebench R23 multicore and the largest being 0.7% in Cinebench R20 single-core.

Q: Does the Intel Xeon X3450 support ECC memory?

A: Yes, the Xeon X3450 has ECC memory support. The Intel Core i7-3520M does not support ECC memory.

Q: Which CPU has integrated graphics?

A: The Intel Core i7-3520M has integrated Intel HD 4000 graphics. The Intel Xeon X3450 has no integrated graphics, so it requires a discrete GPU.

Q: What is the TDP difference between the two?

A: The Intel Core i7-3520M has a TDP of 35 watts, while the Intel Xeon X3450 has a TDP of 95 watts. The i7 consumes significantly less power.

Q: How do their average benchmark scores compare?

A: The Intel Core i7-3520M has an average benchmark score of 843, and the Intel Xeon X3450 has an average of 837. The i7 is in the 23rd percentile of all CPUs, while the Xeon is in the 22nd percentile.

Where Each One Wins

The Intel Core i7-3520M wins in scenarios where power efficiency and mobility matter. Its 35-watt TDP makes it suitable for laptops and compact systems where heat and battery life are critical. The integrated Intel HD 4000 graphics eliminate the need for a separate GPU, simplifying the build and reducing power draw further. Its smaller die size (118 mm²) and newer 22 nm process make it a more modern part. The i7 is also tied to the faster boost clock of 3.60 GHz, which helps in lightly threaded tasks, even if the benchmark deltas are tiny.

The Intel Xeon X3450 wins in server and workstation environments where ECC memory is a requirement. Its support for DDR3 memory with 21.3 GB/s bandwidth and ECC error correction makes it suitable for data integrity-sensitive workloads. The Xeon’s 4 cores and 8 threads provide a theoretical advantage in heavily multi-threaded applications, even if the benchmarks do not show a significant real-world lead. Its 8 MB of L3 cache is double that of the i7, which could help with larger working sets. The Xeon’s PCIe Gen 2 with 16 lanes (CPU only) is a server-grade feature. The Xeon also has a launch MSRP of $241, which is noted for reference.

The data does not show a clear winner for general-purpose desktop use; the performance is too close. The i7-3520M is the better choice for mobile and low-power builds, while the Xeon X3450 is the better choice for ECC-capable workstations. For everything else, the choice should be dictated by the platform, not the performance numbers.

Specification Differences

The table below highlights the key differences between the two processors, based only on the fields where they differ.

| Specification | Intel Core i7-3520M | Intel Xeon X3450 |

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

| Cores | 2 | 4 |

| Threads | 4 | 8 |

| Base Clock | 2.90 GHz | 2.67 GHz |

| Boost Clock | 3.60 GHz | 3.20 GHz |

| TDP | 35 W | 95 W |

| Socket | Intel BGA 1023 | Intel Socket 1156 |

| Architecture | Ivy Bridge | Nehalem |

| Codename | Ivy Bridge | Lynnfield |

| Process Node | 22 nm | 45 nm |

| Die Size | 118 mm² | 296 mm² |

| Transistors | Not listed | 774 million |

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

| Memory Support | Not listed | DDR3 |

| Memory Bandwidth | Not listed | 21.3 GB/s |

| ECC Memory | No | Yes |

| PCIe | Not listed | Gen 2, 16 Lanes (CPU only) |

| Integrated Graphics | Intel HD 4000 | None |

| Market Segment | Mobile | Server/Workstation |

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

| Release Date | 2012-06-02 | 2009-09-07 |

| Launch MSRP | Not listed | $241 |

| Part Number | SR0MU | SLBLD |