Intel Core i7-6800K vs Intel Xeon E5-4627 v3 Comparison

The Intel Core i7-6800K and Intel Xeon E5-4627 v3 are both End-of-life processors built for the Intel Socket 2011-3 platform, yet they target very different corners of the market. The Core i7 is a desktop part with an unlocked multiplier, while the Xeon is a server/workstation chip with ECC memory support. Benchmark results show a consistent, if modest, advantage for the Xeon across every tested workload, making this comparison less about raw speed and more about platform features and intended use cases.

Head-to-Head Benchmarks

The data from the head-to-head benchmark suite paints a remarkably consistent picture: the Intel Xeon E5-4627 v3 wins all six tested benchmarks, but by a narrow margin that never exceeds 5.8%. In Cinebench R15 multicore, the Xeon scores 971 against the Core i7-6800K’s 916, a 5.7% difference. The single-core result in the same test is 137 versus 129, a 5.8% gap that represents the largest delta in the entire comparison. Moving to Cinebench R20, the Xeon again leads in multicore with 4049 versus 3819, and in single-core with 571 versus 538, both maintaining the same 5.7% and 5.8% margins respectively. The pattern holds in Cinebench R23, where the Xeon posts 9642 to the Core i7’s 9093 in multicore and 1361 to 1283 in single-core, with the delta stuck at 5.7% for both.

What is striking about these results is the uniformity of the performance gap. Regardless of the Cinebench version or whether the workload scales across all cores or runs on a single thread, the Xeon E5-4627 v3 maintains a lead of roughly 5.7% to 5.8% over the Core i7-6800K. This suggests the Xeon’s advantage is not tied to any specific workload characteristic but rather to a fundamental per-clock efficiency edge. The Xeon’s base clock of 2.60 GHz and boost clock of 3.20 GHz are both lower than the Core i7’s 3.40 GHz and 3.60 GHz, yet it still wins every test. That means the Xeon’s Haswell architecture is delivering more work per clock cycle than the Core i7’s Broadwell design in these benchmarks.

The average benchmark scores from the broader database corroborate this head-to-head outcome, though with a tighter margin. The Core i7-6800K has an average benchmark score of 2838, while the Xeon E5-4627 v3 averages 2789. This places the Core i7 slightly ahead in the aggregate, but the two chips sit at the same 51st percentile versus all CPUs. The discrepancy between the head-to-head results and the average scores is explained by the fact that the Core i7’s Geekbench results—5688 multicore and 1237 single-core—are not included in the head-to-head comparison, and the Xeon lacks Geekbench entries entirely. The Core i7’s nearest rivals include the Intel Core i5-10600 at 2837 (a 0% delta) and the Intel Xeon E-2126G at 2842 (a -0.1% delta), showing it sits in a tight cluster. The Xeon’s nearest rivals include the Intel Core i7-5930K at 2775 (a 0.5% delta) and the Intel Core i5-8600K at 2807 (a -0.6% delta), indicating it too is surrounded by comparable performers.

Where Each One Wins

The Intel Xeon E5-4627 v3 is the clear winner in every benchmark where the two are directly compared. Its scores are higher across Cinebench R15, R20, and R23, in both single-core and multicore runs. The Xeon’s 10 cores and 20 threads outnumber the Core i7’s 6 cores and 12 threads, and while the Core i7 compensates with higher clock speeds, the Xeon’s superior per-clock performance and additional cores give it the edge in all tested workloads. The Xeon also brings ECC memory support, a feature absent from the Core i7, which makes it the appropriate choice for error-sensitive server or workstation environments where data integrity is paramount.

However, the Core i7-6800K is not without its advantages. Its Geekbench scores, which are not part of the head-to-head suite, show strong results: 5688 in multicore and 1237 in single-core. These figures are not directly compared to the Xeon, but they contribute to the Core i7’s higher average benchmark score of 2838 versus the Xeon’s 2789. The Core i7 also has a higher memory bandwidth rating at 76.8 GB/s compared to the Xeon’s 68.3 GB/s, and it features an unlocked multiplier, allowing for overclocking—a capability the Xeon lacks entirely. For users who prioritize memory throughput or plan to push the processor beyond stock speeds, the Core i7 is the more flexible option.

The market segments tell the story clearly. The Core i7-6800K is a desktop part, designed for enthusiast builds where overclocking and high single-thread performance matter. The Xeon E5-4627 v3 is a server/workstation processor, built for stability, ECC memory, and consistent multi-threaded throughput. In purely benchmark-driven terms, the Xeon wins every direct comparison, but the Core i7’s aggregate score and overclocking headroom give it a different kind of appeal for desktop users.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Xeon E5-4627 v3 has 10 cores and 20 threads, while the Intel Core i7-6800K has 6 cores and 12 threads.

Q: Does the Core i7-6800K support ECC memory?

A: No, the Core i7-6800K does not support ECC memory. The Xeon E5-4627 v3 does support ECC memory.

Q: What is the launch MSRP for each processor?

A: The Core i7-6800K had a launch MSRP of $434, while the Xeon E5-4627 v3 had a launch MSRP of $2225.

Q: Which processor has a higher boost clock?

A: The Core i7-6800K has a higher boost clock at 3.60 GHz, compared to the Xeon E5-4627 v3’s 3.20 GHz.

Q: How much L3 cache does each processor have?

A: The Core i7-6800K has 15 MB of shared L3 cache, while the Xeon E5-4627 v3 has 25 MB of shared L3 cache.

Q: Which processor is unlocked for overclocking?

A: The Core i7-6800K has an unlocked multiplier, making it overclockable. The Xeon E5-4627 v3 has a locked multiplier.

Specification Differences

The two processors differ in several key specifications beyond their core counts. The Core i7-6800K has a base clock of 3.40 GHz and a boost clock of 3.60 GHz, while the Xeon E5-4627 v3 runs at 2.60 GHz base and 3.20 GHz boost. The Core i7 has a TDP of 140 watts, slightly higher than the Xeon’s 135 watts. Memory bandwidth also differs, with the Core i7 rated at 76.8 GB/s and the Xeon at 68.3 GB/s. The Core i7 supports 28 PCIe Gen 3 lanes, while the Xeon offers 40 PCIe Gen 3 lanes. The Core i7’s L3 cache is 15 MB shared, whereas the Xeon has 25 MB shared. The Core i7 supports DDR4 memory without ECC, while the Xeon supports DDR4 with ECC. The Core i7 has an unlocked multiplier; the Xeon is locked. The Core i7 was released on 2016-05-30, while the Xeon was released on 2015-05-31.

Architecture Differences

The architecture divide between these two chips is significant. The Core i7-6800K is built on Intel’s Broadwell architecture, specifically the Broadwell-E codename, using a 14 nm process node. It contains 3,400 million transistors on a die size of 246 mm². The Xeon E5-4627 v3, in contrast, uses the Haswell architecture with the Haswell-EP codename, fabricated on a larger 22 nm process. It packs 2,600 million transistors into a larger 356 mm² die. Both processors share the same Intel Socket 2011-3 and offer quad-channel memory buses, but the manufacturing differences are substantial. The newer 14 nm process on the Core i7 allows for a smaller die and more transistors, while the Xeon’s 22 nm process results in a larger physical footprint with fewer transistors. The Xeon compensates with more cores, threads, and L3 cache. Additionally, the Core i7 supports 28 PCIe lanes versus the Xeon’s 40, and the Xeon’s ECC memory support is a feature entirely absent from the Core i7. Both processors lack integrated graphics, and both are marked as end-of-life, with the Xeon arriving a year earlier than the Core i7.