Intel Core i7-2920XM vs Intel Xeon W5580 Comparison

The Verdict

The benchmark data is unambiguous: the Intel Core i7-2920XM is the superior processor in every single recorded head-to-head test. It wins all five Cinebench comparisons, with margins between 15.9% and 16.1% across multi-core and single-core workloads. For users choosing between these two end-of-life parts, the i7-2920XM delivers consistently higher raw performance, making it the clear pick for any workload where compute speed matters more than platform specifics.

The Intel Xeon W5580, despite carrying a higher launch MSRP of $1600, trails the i7-2920XM in every benchmark category. In Cinebench R23 multi-core, the Xeon scores 2940 versus 3504 for the i7, a 16.1% deficit. The single-core gap is nearly identical at 16.0%. Where the Xeon does differentiate is in platform attributes, not speed. It supports ECC memory, a triple-channel memory bus, and targets the server/workstation segment. Users who require those server-grade features should pick the W5580; users who want maximum performance in Cinebench tests should pick the i7-2920XM.

Neither processor earns a high percentile ranking among all CPUs. The Xeon sits at the 28th percentile, the i7 at the 27th percentile. Their average benchmark scores are similarly close: 1012 for the Xeon versus 995 for the i7. Yet the head-to-head data tells a different story. The i7 wins decisively on every specific Cinebench test. The database shows a clear winner for computational throughput: the Core i7-2920XM.

Architecture Differences

The two processors come from different architectural eras. The Xeon W5580 uses the Nehalem architecture, codenamed Gainestown, built on a 45 nm process with 731 million transistors and a die size of 263 mm². The i7-2920XM uses the Sandy Bridge architecture, built on a 32 nm process with 1,160 million transistors and a smaller die at 216 mm². This node shrink allowed Intel to pack significantly more transistors into a smaller area, which contributes to the i7's performance advantage.

Core and thread counts are identical: 4 cores and 8 threads on both. Cache configurations also match: 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. The key differences lie elsewhere. The Xeon runs on Intel Socket 1366 while the i7 uses Intel Socket G2 (988B). The Xeon\'s base clock is 3.20 GHz with a boost of 3.47 GHz, while the i7 starts at 2.50 GHz and boosts to 3.50 GHz. The higher boost clock of the i7 likely contributes to its single-core advantage.

Memory architecture differs significantly. The Xeon supports triple-channel DDR3 with a maximum memory bandwidth of 32.0 GB/s, while the i7 uses dual-channel DDR3 with 25.6 GB/s bandwidth. The Xeon also supports ECC memory; the i7 does not. Both run PCIe Gen 2, but the i7 lists 16 lanes (CPU only) while the Xeon offers no explicit lane count. The i7 includes integrated graphics (Intel HD 3000), while the Xeon has none.

The Xeon is a 130 W part, the i7 a 55 W part. The i7 uses a mobile socket (Socket G2) and is an unlocked multiplier (a Core i7 Extreme), while the Xeon is server-oriented and locked. Release dates differ: the Xeon came out in March 2009, the i7 in January 2011. The i7 is the newer design by nearly two years.

FAQ

Q: Which CPU wins the most benchmark tests?

A: The Intel Core i7-2920XM wins all 5 head-to-head Cinebench tests, with zero wins for the Intel Xeon W5580.

Q: How large is the multi-core performance gap?

A: The i7-2920XM leads by 16.1% across Cinebench R15, R20, and R23 multi-core tests. For example, in R20 multi-core the i7 scores 1471 vs 1234 for the Xeon, and in R23 multi-core the margin is 3504 vs 2940.

Q: Does the Xeon have any memory advantage?

A: Yes. The Xeon W5580 supports triple-channel DDR3 with 32.0 GB/s bandwidth and ECC memory. The i7-2920XM is dual-channel with 25.6 GB/s bandwidth and no ECC.

Q: Which processor has a higher boost clock?

A: The i7-2920XM boosts to 3.50 GHz, slightly higher than the Xeon\'s 3.47 GHz. The Xeon has a higher base clock at 3.20 GHz vs 2.50 GHz.

Q: Are these processors still relevant by percentile rank?

A: The Xeon sits at the 28th percentile and the i7 at the 27th percentile among all CPUs, indicating both are low in overall performance ranking. Their average benchmark scores are 1012 and 995, respectively.

Q: Can the i7 overclock?

A: Yes. The i7-2920XM has an unlocked multiplier, a feature tied to its Extreme branding. The Xeon W5580 does not.

Specification Differences

| Specification | Intel Xeon W5580 | Intel Core i7-2920XM |

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

| Base Clock | 3.20 GHz | 2.50 GHz |

| Boost Clock | 3.47 GHz | 3.50 GHz |

| TDP | 130 W | 55 W |

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

| Architecture | Nehalem | Sandy Bridge |

| Process Node | 45 nm | 32 nm |

| Transistors | 731 million | 1,160 million |

| Die Size | 263 mm² | 216 mm² |

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

| Memory Bandwidth | 32.0 GB/s | 25.6 GB/s |

| ECC Memory | Yes | No |

| Integrated Graphics | None | Intel HD 3000 |

| Market Segment | Server/Workstation | Mobile |

| Release Date | 2009-03-29 | 2011-01-02 |

| Launch MSRP | $1600 | $1096 |

| Multiplier Unlocked | No | Yes |

| Part Number | SLBF2 | SR02E |

Head-to-Head Benchmarks

The data shows a clean sweep for the i7-2920XM. The only benchmark category where the Xeon even comes close is in the single-core tests, but even there the i7 maintains a lead of 15.9% to 16.0%. In Cinebench R20 single-core, the i7 scores 207 against 174 for the Xeon, a 15.9% delta. In R23 single-core, the i7 scores 494 against 415, a 16.0% delta. The i7 has a higher boost clock (3.50 GHz vs 3.47 GHz), which likely explains the margin.

Multi-core tests show a consistent 16.1% lead for the i7. In Cinebench R15 multi-core, the i7 scores 353 vs 296. In R20 multi-core, it scores 1471 vs 1234. In R23 multi-core, it scores 3504 vs 2940. These are not marginal differences, they are substantial gaps that show the i7 maintains its advantage across different versions of the same benchmark suite. The i7\'s higher transistor count and newer architecture appear to outweigh its lower base clock.

The Xeon never wins a single head-to-head test. Its higher base clock (3.20 GHz) and larger memory bandwidth (32.0 GB/s) do not translate into performance wins. The i7\'s 32 nm process and higher boost clock are the dominant factors.

Where Each One Wins

The i7-2920XM is the clear choice for raw compute performance. It wins every single-core and multi-core Cinebench test. This makes it the better pick for users running Cinebench workloads, video encoding, 3D rendering, or any task that scales with CPU cores and clock speed. The i7 also has the advantage of being an unlocked multiplier, so users willing to overclock can push it further. Its mobile socket and 55 W TDP make it more suitable for compact or lower-power systems, despite being a mobile part in a desktop comparison.

The Xeon W5580 wins in server-specific features. It supports triple-channel memory with 32.0 GB/s bandwidth, which is 25% higher than the i7\'s 25.6 GB/s. It also supports ECC memory, a critical feature for error-sensitive workstation or server workloads. The Xeon\'s launch MSRP of $1600 reflects its server positioning, even though its performance in these benchmarks is lower. For users who prioritize data integrity, multi-channel memory, or require a Socket 1366 platform, the Xeon is the only option here.

The i7-2920XM also holds a price advantage at launch, with a $1096 MSRP versus $1600 for the Xeon. However, pricing should not be the deciding factor, as both processors are end-of-life products. The recorded data sets the verdict: if you value benchmark performance, choose the i7-2920XM. If you value server features like ECC and triple-channel memory, choose the Xeon W5580.