CPU Comparison

The Intel Core i7-870S and Intel Xeon E5530 are both 45 nm Nehalem-era parts with four cores and eight threads, but they target different segments. The benchmark data shows a consistent, though narrow, advantage for the desktop-oriented Core i7-870S across every tested workload, while the Xeon E5530 counters with platform-level features like ECC memory and triple-channel bandwidth. This analysis breaks down the measured performance deltas, architectural commonalities, and specification differences to determine which processor suits which use case.

Head-to-Head Benchmarks

The head-to-head results are uniform: the Intel Core i7-870S wins all five recorded Cinebench tests, but the margins are slim. In Cinebench R15 multicore, the Core i7-870S scores 236 against the Xeon E5530’s 234, a 0.9% delta. The R20 multicore test shows a similar pattern, with the i7-870S at 987 and the E5530 at 977, a 1% edge. The single-core tests follow the same trend: R20 single-core yields 139 for the i7-870S versus 137 for the E5530, a 1.5% advantage, while R23 single-core records 331 against 328, a 0.9% delta.

The largest relative gap appears in Cinebench R20 single-core, where the Core i7-870S leads by 1.5%. This is consistent with its higher boost clock, which directly benefits lightly threaded workloads. The multicore margins are slightly smaller, at 0.9% to 1%, reflecting the fact that both chips have identical core and thread counts, and their shared 8 MB L3 cache levels the playing field for heavily threaded rendering tasks. In R23 multicore, the i7-870S posts 2350 versus 2328 for the E5530, another 0.9% advantage.

Looking at the broader benchmark context, the Core i7-870S has an average benchmark score of 809, placing it in the 22nd percentile of all CPUs. The Xeon E5530 averages 801, sitting in the 21st percentile. The delta between their average scores is just 1%, mirroring the head-to-head results. The nearest rivals for the i7-870S include the AMD A10-6800K at an identical 809 (0% delta) and the Intel Core 2 Extreme QX9775 at 813 (-0.5% delta), indicating the i7-870S sits in a tightly packed performance band. The E5530’s nearest rival is the AMD A10-7700K at 801 (0% delta), with the Intel Pentium Silver J5040 also at 801 (0% delta), showing the Xeon occupies the same performance tier as the i7-870S but at the lower end of that grouping.

Where Each One Wins

The data shows the Intel Core i7-870S wins every benchmark where the two are directly compared, making it the clear choice for raw compute performance. Its strongest advantage is in single-core workloads, as evidenced by the 1.5% lead in Cinebench R20 single-core. This suggests the i7-870S is better suited for applications that rely on per-thread responsiveness, such as older games or lightly threaded productivity tools, where its 3.60 GHz boost clock provides a tangible benefit over the E5530’s 2.67 GHz boost.

For multicore rendering, the i7-870S also leads, but the margin is narrower, around 0.9% to 1%. In Cinebench R15 and R23 multicore, the scores are close enough that the difference is nearly negligible for most users. However, the i7-870S still wins, which means it holds a slight edge in threaded workloads like video encoding or 3D rendering. The Xeon E5530, despite losing all head-to-head tests, offers its own advantages outside raw compute: it supports ECC memory and triple-channel DDR3 with a measured memory bandwidth of 25.6 GB/s, whereas the i7-870S lacks ECC support and uses dual-channel memory without a listed bandwidth figure. For workloads that prioritize data integrity over speed, the E5530’s platform features make it the more appropriate option.

Architecture Differences

Both processors are built on Intel’s Nehalem architecture, but they come from different codenames: the Core i7-870S is Lynnfield, while the Xeon E5530 is Gainestown. The process node is identical at 45 nm, and both use Intel as the foundry. The transistor counts are close, with the i7-870S at 774 million and the E5530 at 731 million, and the die sizes differ modestly at 296 mm² for the i7-870S versus 263 mm² for the E5530. These physical differences do not translate into a major performance gap, as the benchmark scores confirm.

The cache hierarchy is identical on both chips: 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. This means architectural differences come down to memory controllers and platform integration. The i7-870S uses a dual-channel memory bus, while the E5530 uses triple-channel, which gives the Xeon a theoretical bandwidth advantage that is quantified at 25.6 GB/s. The i7-870S has no listed memory bandwidth figure. The i7-870S also specifies PCIe Gen 2 with 16 lanes (CPU only), whereas the E5530 lists only PCIe Gen 2 without a lane count. Neither chip has integrated graphics.

Specification Differences

The most prominent specification difference is the socket: the Core i7-870S uses Intel Socket 1156, while the Xeon E5530 uses Intel Socket 1366. This alone determines motherboard compatibility and prevents direct swapping. Clock speeds differ significantly. The i7-870S runs at a base clock of 2.67 GHz and boosts to 3.60 GHz, while the E5530 has a base clock of 2.40 GHz and a lower boost of 2.67 GHz. The i7-870S is the faster part in both metrics, which explains its consistent benchmark wins.

Thermal design power is nearly identical, with the i7-870S rated at 82 W and the E5530 at 80 W. Memory support differs in channel count and ECC capability: the i7-870S supports dual-channel DDR3 without ECC, while the E5530 supports triple-channel DDR3 with ECC enabled. The market segments diverge as expected, with the i7-870S classified as Desktop and the E5530 as Server/Workstation. Release dates also differ, with the i7-870S launching on 2010-07-18 and the E5530 on 2009-03-29. The E5530 has a launch MSRP of $530, which may be stated once as a historical reference. Part numbers are SLBQ7 for the i7-870S and SLBF7 for the E5530. Neither processor has an unlocked multiplier, and both are end-of-life.

FAQ

Q: Which processor has a higher boost clock?

A: The Intel Core i7-870S boosts to 3.60 GHz, while the Intel Xeon E5530 boosts to 2.67 GHz.

Q: What is the performance difference in Cinebench R20 multicore?

A: The Core i7-870S scores 987, and the Xeon E5530 scores 977, giving the i7-870S a 1% lead.

Q: Does the Xeon E5530 support ECC memory?

A: Yes, the Xeon E5530 supports ECC memory, while the Core i7-870S does not.

Q: How do the average benchmark scores compare?

A: The Core i7-870S has an average benchmark score of 809, and the Xeon E5530 has 801, a difference of 1%.

Q: What socket does each processor use?

A: The Core i7-870S uses Intel Socket 1156, and the Xeon E5530 uses Intel Socket 1366.

Q: Which processor has a higher memory bandwidth?

A: The Xeon E5530 has a listed memory bandwidth of 25.6 GB/s, while the Core i7-870S has no listed bandwidth figure.

The Verdict

The benchmark data is unambiguous: the Intel Core i7-870S outperforms the Intel Xeon E5530 in every recorded test. For users who prioritize raw compute performance, the i7-870S is the better choice, with a 1.5% advantage in single-core R20 and a 0.9% to 1% edge in multicore tests. Its higher base and boost clocks (2.67 GHz and 3.60 GHz versus 2.40 GHz and 2.67 GHz) drive these results, and its desktop socket (1156) makes it suitable for consumer platforms.

The Xeon E5530, however, is not without merit. Its triple-channel memory bus with 25.6 GB/s bandwidth and ECC support make it the only option here for server or workstation environments where data integrity is critical. The E5530 also consumes slightly less power at 80 W versus 82 W, though the difference is negligible. Its Socket 1366 platform and server segment classification indicate it belongs in a different class of system.

In short, the data shows the Core i7-870S is the faster processor for computing tasks, while the Xeon E5530 is the appropriate pick for memory-intensive, error-checking workloads that demand ECC and higher bandwidth. The choice hinges on the platform and reliability requirements, not on raw benchmark scores, where the i7-870S holds a slim but consistent lead.