Intel Core i5-6600 vs Intel Xeon E5-2637 v3 Comparison

Head-to-Head Benchmarks

The benchmark data presents an unambiguous picture: the Intel Xeon E5-2637 v3 wins all six recorded head-to-head comparisons against the Intel Core i5-6600. The victory is consistent across every Cinebench version, both multi-core and single-core workloads, with deltas ranging from 18.7% to 19.2%.

Starting with multi-core performance, the Xeon E5-2637 v3 scores 617 in Cinebench R15, while the Core i5-6600 manages 520. That is an 18.7% advantage. The margin grows slightly in Cinebench R20, where the Xeon posts 2574 versus 2167 for the Core i5, a difference of 18.8%. The trend holds in Cinebench R23, with the Xeon at 6130 and the Core i5 at 5161, again an 18.8% lead. These results are striking because both processors feature four physical cores; the Xeon's advantage stems from its eight threads versus the Core i5's four, a factor that becomes decisive in heavily threaded rendering workloads.

Single-core results tell a similar story, though the gap is more surprising given the Core i5's higher boost clock of 3.90 GHz versus the Xeon's 3.70 GHz. In Cinebench R15 single-core, the Xeon scores 87 against 73 for the Core i5, a 19.2% margin. Cinebench R20 single-core shows the Xeon at 363 and the Core i5 at 305, a 19% difference. Cinebench R23 single-core repeats the pattern: 865 for the Xeon, 728 for the Core i5, an 18.8% gap. The Xeon's older Haswell architecture still delivers superior per-thread performance in these tests, suggesting that its higher base clock of 3.50 GHz and larger cache contribute meaningfully to single-thread efficiency.

In the broader database context, both CPUs sit at the 41st percentile among all processors, indicating they occupy similar overall performance tiers. The Xeon's average benchmark score is 1773, while the Core i5 averages 1744. That is a modest 1.6% difference in aggregate, yet the head-to-head Cinebench results show a much larger spread. The discrepancy arises because the Core i5 has one additional benchmark entry, Geekbench, where it scores 3755 multi-core and 1239 single-core. These Geekbench numbers are not directly comparable to the Cinebench results, and their inclusion pulls the Core i5's average closer to the Xeon's.

The Xeon's nearest rivals in the database include the Intel Xeon E5-4610 v3 at 1777 average score, a 0.2% difference, and the AMD Ryzen 3 PRO 1300 at 1778, a 0.3% difference. The Core i5's nearest rivals include the Intel Core i7-980X at 1746, a 0.1% difference, and the AMD Ryzen 3 4300U at 1742, also a 0.1% difference. These proximity values highlight that both chips are clustered with other mid-range performers, but the raw Cinebench data shows the Xeon pulling consistently ahead of the Core i5 by nearly one-fifth in every test.

FAQ

Q: Which processor is faster in multi-core Cinebench R23?

A: The Intel Xeon E5-2637 v3 scores 6130, which is 18.8% ahead of the Intel Core i5-6600's 5161.

Q: Does the Core i5-6600 win any benchmark comparison?

A: No. The recorded data shows winsA equal to 6 for the Xeon and winsB equal to 0 for the Core i5 across all six head-to-head Cinebench tests.

Q: How do the two CPUs compare in single-core performance?

A: The Xeon leads in every single-core test. In Cinebench R15, it scores 87 versus 73, a 19.2% advantage. In R20, it scores 363 versus 305, a 19% lead. In R23, it scores 865 versus 728, an 18.8% edge.

Q: What is the average benchmark score for each processor?

A: The Xeon E5-2637 v3 has an average benchmark score of 1773, while the Core i5-6600 averages 1744. Both sit at the 41st percentile among all CPUs in the database.

Q: Do the processors support ECC memory?

A: Yes for the Xeon, which has ECC memory support enabled. The Core i5-6600 does not support ECC memory.

Q: Which processor has a higher boost clock?

A: The Core i5-6600 has a boost clock of 3.90 GHz, compared to the Xeon's 3.70 GHz. Despite this, the Xeon still wins all single-core benchmark tests.

Architecture Differences

The two processors come from different Intel generations and process nodes. The Xeon E5-2637 v3 is built on the Haswell architecture, specifically the Haswell-EP variant, using a 22 nm process node. The Core i5-6600 uses the Skylake architecture on a 14 nm process node. Both are manufactured by Intel, but the process shrink gives the Core i5 a smaller die size of 177 mm² compared to the Xeon's 356 mm².

The Xeon packs 2,600 million transistors into its larger die, while the Core i5's transistor count is not recorded in the database. Cache configurations differ substantially. Both feature 64 KB of L1 cache per core and 256 KB of L2 cache per core, but the Xeon has 15 MB of shared L3 cache, while the Core i5 has only 6 MB. This 9 MB difference in L3 cache likely contributes to the Xeon's strong single-core benchmark results, as more cache reduces memory latency for frequently accessed data.

Memory architecture represents another significant divide. The Xeon supports DDR4 memory with a quad-channel bus and a theoretical memory bandwidth of 68.3 GB/s. The Core i5 supports both DDR3 and DDR4, but only with a dual-channel bus, yielding 34.1 GB/s of memory bandwidth. For memory-intensive server workloads, the Xeon's quad-channel setup offers double the bandwidth of the Core i5's dual-channel configuration.

PCI Express support also differs. The Xeon provides Gen 3 with 40 lanes (CPU only), while the Core i5 provides Gen 3 with 16 lanes (CPU only). That is a 24-lane difference, giving the Xeon significantly more expansion headroom for multiple GPUs, NVMe drives, or other high-bandwidth peripherals.

The Xeon includes ECC memory support, a critical feature for server and workstation reliability, while the Core i5 lacks it entirely. The Core i5 does include integrated graphics, specifically UHD Graphics 530, whereas the Xeon has no integrated graphics. This means the Core i5 can power a display without a discrete GPU, while the Xeon requires a separate graphics card.

Specification Differences

The core count is identical: both have 4 physical cores. However, the Xeon supports 8 threads through Hyper-Threading, while the Core i5 supports only 4 threads. This thread count difference is a primary driver of the multi-core benchmark gaps.

Base clocks differ, with the Xeon at 3.50 GHz and the Core i5 at 3.30 GHz. Boost clocks invert the relationship: the Core i5 boosts to 3.90 GHz, higher than the Xeon's 3.70 GHz. The Xeon has a TDP of 135 watts, while the Core i5 draws only 35 watts. That is a 100-watt difference, reflecting the Xeon's server-grade power requirements versus the Core i5's desktop efficiency focus.

Sockets are incompatible: the Xeon uses Intel Socket 2011-3, while the Core i5 uses Intel Socket 1151. Memory support differs as described: the Xeon supports only DDR4 with quad-channel, while the Core i5 supports DDR3 and DDR4 with dual-channel. Memory bandwidth is 68.3 GB/s for the Xeon and 34.1 GB/s for the Core i5.

PCIe lanes differ at 40 for the Xeon and 16 for the Core i5, both Gen 3. The Xeon has ECC memory support, the Core i5 does not. The Core i5 has integrated graphics, the Xeon does not. Market segments differ: the Xeon targets Server/Workstation, while the Core i5 targets Desktop. Both are end-of-life in production status, but the Xeon launched on September 7, 2014, while the Core i5 launched on June 30, 2015, nearly ten months later. The launch MSRP for the Xeon is $996, while the Core i5's launch MSRP is $224. Neither processor has an unlocked multiplier.

The Verdict

The data points to a clear performance hierarchy. In every recorded benchmark, the Xeon E5-2637 v3 outperforms the Core i5-6600 by roughly 19%. This applies to both single-core and multi-core Cinebench tests across R15, R20, and R23 versions. The Xeon's eight threads give it a decisive edge in multi-threaded workloads, while its larger 15 MB L3 cache appears to bolster single-thread scores even against the Core i5's higher boost clock.

For users running threaded rendering workloads, the Xeon is the better choice. Its 18.8% lead in Cinebench R23 multi-core translates directly into faster completion times for CPU-based rendering tasks. The quad-channel memory and 40 PCIe lanes also make it suitable for workstation builds requiring substantial memory bandwidth and expansion capacity. The ECC memory support adds reliability for data-critical environments.

For users prioritizing power efficiency or needing integrated graphics, the Core i5-6600 has advantages that the benchmark scores do not capture. Its 35 watt TDP is dramatically lower than the Xeon's 135 watts, making it far easier to cool and more economical in daily operation. The integrated UHD Graphics 530 means a discrete GPU is unnecessary for basic display output, which can reduce system cost and complexity.

The socket incompatibility ensures these are not interchangeable parts. The Xeon requires a Socket 2011-3 motherboard, typically associated with server platforms, while the Core i5 fits the mainstream Socket 1151. Anyone building a new system should base their choice on the platform requirements first, then weigh the Xeon's performance and memory advantages against the Core i5's efficiency and integrated graphics.

In aggregate benchmark terms, the two are close: the Xeon's average score of 1773 is only 1.6% higher than the Core i5's 1744, and both sit at the 41st percentile. But the head-to-head Cinebench data shows a consistent 19% gap. The discrepancy is explained by the Core i5's Geekbench scores, which are not part of the head-to-head comparison. For workloads resembling Cinebench, the Xeon is the clear winner. For mixed workloads including Geekbench-style tasks, the gap narrows considerably.

The verdict from the recorded data: the Xeon E5-2637 v3 is the faster processor in every tested scenario, with a substantial and consistent margin. The Core i5-6600 remains a viable alternative for users who value low power draw and built-in graphics, but it cannot match the Xeon's raw compute performance.