Intel Core i7-870 vs Intel Xeon W3540 Comparison

Intel Core i7-870 vs Intel Xeon W3540: a matchup of two 2009-era Intel Nehalem parts that share core counts and thread counts but target different platforms. The data shows a consistent, if narrow, edge for the desktop Core i7 across every recorded Cinebench test, while the Xeon counters with platform-level features like ECC memory support and a triple-channel memory bus. Both processors are long end-of-life products, yet their benchmark profiles remain useful for understanding how Intel segmented its four-core, eight-thread designs between consumer and workstation sockets.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core i7-870 records an average benchmark score of 928, placing it at the 25th percentile of all CPUs. The Intel Xeon W3540 scores 913 on average, placing it at the 24th percentile. The i7-870 leads by 15 points in this aggregate metric.

Q: How do the two processors compare in multi-core Cinebench R23?

A: The Core i7-870 scores 2697 in Cinebench R23 multi-core, while the Xeon W3540 scores 2652. The i7-870 wins by 1.7%, which is the largest recorded margin in any head-to-head test.

Q: What memory features does the Xeon W3540 offer that the Core i7-870 lacks?

A: The Xeon W3540 supports ECC memory, a feature not present on the Core i7-870. Additionally, the Xeon uses a triple-channel memory bus, whereas the Core i7-870 uses a dual-channel configuration. Both processors support DDR3 memory.

Q: Are both processors based on the same microarchitecture?

A: Yes, both use the Nehalem architecture. The Core i7-870 carries the codename Lynnfield and uses the Intel Socket 1156, while the Xeon W3540 carries the codename Bloomfield and uses the Intel Socket 1366. Both are built on Intel's 45 nm process node.

Q: What is the boost clock difference between the two chips?

A: The Core i7-870 has a boost clock of 3.60 GHz, while the Xeon W3540 boosts to 3.20 GHz. The base clock is identical at 2.93 GHz for both processors.

Q: Which processor wins the most head-to-head benchmark comparisons?

A: The Core i7-870 wins all five recorded head-to-head comparisons against the Xeon W3540. The Xeon W3540 does not win any of the five tests in the database.

Architecture Differences

The two processors stem from the same Nehalem generation but diverge in package and platform design. The Core i7-870 uses the Lynnfield die, which integrates the memory controller and PCIe lanes onto the processor itself. It connects to the Intel Socket 1156 platform and exposes Gen 2 PCIe with 16 lanes from the CPU. The Xeon W3540 uses the Bloomfield die, which is designed for the Intel Socket 1366 platform. This older design relies on a separate I/O hub for PCIe connectivity, and the processor itself lists Gen 2 PCIe without a lane count in the recorded data.

The transistor counts differ slightly. The Core i7-870 packs 774 million transistors on a 296 mm² die, while the Xeon W3540 has 731 million transistors on a 263 mm² die. Both are fabricated on Intel's 45 nm process, but the larger Lynnfield die accommodates the integrated PCIe controller, explaining the higher transistor figure.

Cache hierarchies are identical in capacity: each core gets 64 KB of L1 and 256 KB of L2, with a shared 8 MB L3 cache. The memory controllers differ fundamentally. The Core i7-870 uses dual-channel DDR3, while the Xeon W3540 uses triple-channel DDR3, giving the workstation part more memory bandwidth potential in theory. The Xeon also enables ECC memory, a feature absent from the desktop chip.

The sockets are not cross-compatible. The Core i7-870 targets desktop systems on Socket 1156, while the Xeon W3540 targets server and workstation boards on Socket 1366. This platform split affects upgrade paths, motherboard features, and memory configurations. The market segments reflect this: the i7-870 is listed as Desktop, the Xeon W3540 as Server/Workstation.

Thermal design power differs substantially. The Core i7-870 has a 95 W TDP, while the Xeon W3540 has a 130 W TDP. The higher TDP on the Xeon aligns with its triple-channel memory controller and the need for robust power delivery on workstation boards. Both parts lack integrated graphics and have locked multipliers.

Where Each One Wins

The benchmark data shows a clean sweep for the Core i7-870 across all recorded Cinebench tests. In multi-core workloads, the i7-870 leads by 1.5% in Cinebench R15 (271 vs 267) and by 1.7% in both Cinebench R20 (1132 vs 1113) and Cinebench R23 (2697 vs 2652). Single-core tests follow the same pattern: the i7-870 wins Cinebench R20 single-core by 1.3% (159 vs 157) and Cinebench R23 single-core by 1.6% (380 vs 374).

The Xeon W3540 has no recorded benchmark wins. Its strengths lie outside raw Cinebench performance. The triple-channel memory bus provides a theoretical bandwidth advantage for memory-intensive server workloads, and ECC memory support makes it suitable for error-sensitive environments like data centers or financial computing. The Socket 1366 platform also supports larger memory capacities in typical workstation configurations, though the database does not quantify this.

For general desktop use, the Core i7-870 is the clear choice based on benchmark results. Its higher boost clock of 3.60 GHz versus 3.20 GHz on the Xeon directly translates to better single-threaded performance, as shown by the consistent 1.3% to 1.6% wins in single-core tests. The lower TDP of 95 W versus 130 W also makes it easier to cool in standard desktop chassis.

The Xeon W3540's value proposition hinges on platform features rather than computation speed. Users who require ECC memory and triple-channel bandwidth will select the Xeon despite its slight performance deficit. Users who prioritize raw Cinebench scores and lower power consumption will prefer the Core i7-870.

Specification Differences

The two processors share several core specifications: both have 4 cores, 8 threads, a 2.93 GHz base clock, 45 nm process node, and identical L1, L2, and L3 cache sizes. The differences appear in clock speeds, power, socket, memory, and platform features.

The Core i7-870 boosts to 3.60 GHz, while the Xeon W3540 boosts to 3.20 GHz. This 0.40 GHz advantage for the i7-870 explains its single-core benchmark wins. The TDP also differs: 95 W for the i7-870 versus 130 W for the Xeon W3540.

Socket and platform are distinct. The i7-870 uses Intel Socket 1156 with a dual-channel DDR3 memory bus and no ECC support. The Xeon W3540 uses Intel Socket 1366 with a triple-channel DDR3 memory bus and ECC support. The PCIe implementation also differs: the i7-870 has Gen 2 with 16 lanes from the CPU, while the Xeon W3540 lists only Gen 2 without a lane count.

Die characteristics differ slightly. The i7-870 has 774 million transistors on a 296 mm² die, while the Xeon W3540 has 731 million transistors on a 263 mm² die. Both are built by Intel on 45 nm.

The market segments diverge: the i7-870 is a Desktop part, the Xeon W3540 is a Server/Workstation part. Both are end-of-life in production status. The release dates differ by roughly five months, with the Xeon W3540 launching on 2009-03-29 and the Core i7-870 on 2009-09-07. Part numbers are SLBJG for the i7-870 and SLBEX for the Xeon W3540. Neither processor has an unlocked multiplier.

Head-to-Head Benchmarks

The recorded Cinebench results show a consistent, narrow performance advantage for the Core i7-870 across all five tests. The largest margin occurs in multi-core workloads, where the i7-870 leads by 1.7% in both Cinebench R20 and Cinebench R23. In Cinebench R20 multi-core, the i7-870 scores 1132 against the Xeon W3540's 1113, a 19-point difference. In Cinebench R23 multi-core, the score gap is 45 points (2697 vs 2652), again a 1.7% delta.

Cinebench R15 multi-core shows the smallest absolute gap: the i7-870 scores 271, the Xeon W3540 scores 267, a 4-point difference that translates to 1.5%. This older test compresses the performance difference, but the direction remains unchanged.

Single-core tests follow a similar pattern with slightly smaller margins. Cinebench R20 single-core gives the i7-870 a 159 score against 157 for the Xeon W3540, a 1.3% win. Cinebench R23 single-core shows 380 versus 374, a 1.6% win for the i7-870.

The aggregate picture is clear: the Core i7-870 outperforms the Xeon W3540 by roughly 1.3% to 1.7% across the Cinebench suite. This aligns with the 15-point difference in average benchmark scores (928 vs 913) and the percentile rankings (25th vs 24th). The Xeon's triple-channel memory bus and ECC support do not translate into Cinebench wins, as these workloads favor higher clock speeds and identical cache hierarchies.

The nearest rivals in the database provide context. The Core i7-870's closest competitor is the Intel Core i7-4600U with an average score of 931, a 0.4% delta, followed by the Intel Core i5-4288U at 927 (0.1% delta). The Xeon W3540 sits near the AMD Ryzen 3 3250U at 908 (0.5% delta) and the AMD Athlon Silver 3050U at 917 (0.5% delta). These comparisons place both processors in the same performance tier, with the i7-870 holding a slight edge.

The head-to-head record stands at 5 wins for the Core i7-870 and 0 for the Xeon W3540. No test in the database favors the workstation part. The Xeon W3540's redeeming qualities remain its platform features, not its computational throughput as measured by Cinebench.