CPU Comparison

The Intel Xeon E-2126G and Intel Core i7-6800K are two six-core processors from different eras of Intel’s lineup, yet they land within 0.1% of each other in average benchmark score. The Xeon E-2126G, a Coffee Lake workstation part, and the i7-6800K, a Broadwell-E enthusiast desktop chip, represent divergent design philosophies: one leans on high boost clocks and modern IPC, while the other relies on extra threads and a wider memory bus. Benchmark results show a near-total split, with the i7-6800K winning six of eight head-to-head tests, but the Xeon taking the Geekbench single-core crown by a massive 26.5% margin.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Xeon E-2126G scores 2842, while the Intel Core i7-6800K scores 2838. The delta is a mere 0.1%, placing them statistically in a dead heat.

Q: How do the two CPUs compare in multi-threaded Cinebench R23?

A: The Intel Core i7-6800K wins with a score of 9093, beating the Xeon E-2126G’s 8891 by 2.2%. This advantage is consistent across all Cinebench versions tested.

Q: Where does the Xeon E-2126G achieve its biggest victory?

A: In Geekbench single-core, the Xeon scores 1565 versus the i7-6800K’s 1237, a 26.5% lead. This is the largest performance gap between the two in any benchmark.

Q: What is the difference in memory channel support?

A: The Xeon E-2126G supports dual-channel DDR4 with 42.7 GB/s bandwidth, while the i7-6800K supports quad-channel DDR4 with 76.8 GB/s bandwidth.

Q: Does either processor feature integrated graphics?

A: Only the Intel Xeon E-2126G includes integrated graphics, specifically HD Graphics P630. The i7-6800K has no integrated GPU.

Q: Which processor has a higher boost clock?

A: The Xeon E-2126G boosts to 4.50 GHz, while the i7-6800K boosts to 3.60 GHz. The Xeon’s base clock is 3.30 GHz versus the i7’s 3.40 GHz.

Architecture Differences

The two processors are built on the same 14 nm process node from Intel, but they come from distinct architectural families. The Xeon E-2126G uses the Coffee Lake architecture, specifically the Coffee Lake-S WS codename, and belongs to the Xeon E-2100 series. It is a 6-core, 6-thread part with a 12 MB shared L3 cache. The i7-6800K uses the older Broadwell architecture (Broadwell-E codename) and is a 6-core, 12-thread processor with a 15 MB shared L3 cache. Both share the same per-core L1 and L2 cache sizes at 64 KB and 256 KB respectively.

The die sizes differ substantially: the Xeon E-2126G has a 154 mm² die, while the i7-6800K’s die is 246 mm². The i7-6800K also has a transistor count of 3,400 million, a figure not listed for the Xeon. The i7-6800K is built for the Intel Socket 2011-3 platform, while the Xeon uses Intel Socket 1151. This reflects their different market segments: the Xeon is aimed at Server/Workstation use, while the i7 is a Desktop part.

A key architectural difference is memory support. The Xeon E-2126G supports dual-channel DDR4 with 42.7 GB/s bandwidth and includes ECC memory support. The i7-6800K supports quad-channel DDR4 with 76.8 GB/s bandwidth but lacks ECC support. PCIe lane counts also differ: the Xeon offers 16 CPU lanes on Gen 3, while the i7-6800K offers 28 Gen 3 lanes. The Xeon includes HD Graphics P630 integrated graphics, whereas the i7-6800K has none. Finally, the multiplier is locked on the Xeon, while the i7-6800K is multiplier-unlocked for overclocking.

Head-to-Head Benchmarks

The benchmark results show a clear pattern: the i7-6800K dominates in Cinebench tests, while the Xeon E-2126G wins decisively in Geekbench single-core. In Cinebench R15 multicore, the i7-6800K scores 916 against the Xeon’s 896, a 2.2% win. The single-core R15 test follows the same trend, with the i7 at 129 and the Xeon at 126, a 2.3% margin. Moving to Cinebench R20, the i7-6800K again takes multicore at 3819 versus 3734 (2.2% ahead), and single-core at 538 versus 527 (2% ahead). Cinebench R23 shows the i7-6800K winning multicore at 9093 vs 8891 (2.2% ahead) and single-core at 1283 vs 1255 (2.2% ahead).

The Geekbench results flip the script. In Geekbench multicore, the Xeon E-2126G scores 5743, narrowly edging out the i7-6800K’s 5688, a 1% win. The single-core Geekbench test is where the Xeon truly shines: it scores 1565 versus the i7-6800K’s 1237, a massive 26.5% delta. This is the single largest performance differential in the entire comparison, highlighting the Xeon’s superior single-thread capability due to its higher 4.50 GHz boost clock versus the i7’s 3.60 GHz.

Overall, the i7-6800K wins six of the eight head-to-head benchmarks, but its victories are narrow, ranging from 2% to 2.3%. The Xeon’s two wins include one narrow multicore victory and one overwhelming single-core victory. The average benchmark scores reflect this near-balance: 2842 for the Xeon and 2838 for the i7-6800K, a 0.1% difference. The percentile rankings are identical at 51 for both processors.

Specification Differences

The two processors differ on several key specification fields. The Xeon E-2126G has 6 threads, while the i7-6800K has 12 threads. Base clocks are 3.30 GHz for the Xeon and 3.40 GHz for the i7-6800K, but boost clocks diverge sharply: 4.50 GHz versus 3.60 GHz. Thermal design power is 80 W for the Xeon and 140 W for the i7-6800K. Sockets differ: Intel Socket 1151 for the Xeon, Intel Socket 2011-3 for the i7. The Xeon uses Coffee Lake architecture; the i7 uses Broadwell. L3 cache is 12 MB shared on the Xeon versus 15 MB shared on the i7. Die size is 154 mm² for the Xeon and 246 mm² for the i7.

Memory configurations are notably different: the Xeon supports dual-channel memory with 42.7 GB/s bandwidth, while the i7 supports quad-channel with 76.8 GB/s. ECC memory is supported only on the Xeon. PCIe lanes are 16 for the Xeon versus 28 for the i7. Integrated graphics are present on the Xeon (HD Graphics P630) but absent on the i7. The Xeon is a server/workstation part, while the i7 is a desktop part. The release dates differ: the Xeon launched on 2018-07-11, the i7 on 2016-05-30. The multiplier is locked on the Xeon and unlocked on the i7. The i7-6800K has 3,400 million transistors; no transistor count is listed for the Xeon.

Where Each One Wins

The Intel Core i7-6800K is the winner for multi-threaded workloads that scale with thread count. Its 12 threads versus the Xeon’s 6 threads give it a consistent edge in all Cinebench multicore tests, where it leads by roughly 2.2% regardless of the benchmark version. The i7-6800K also wins every Cinebench single-core test, albeit by a smaller 2% to 2.3% margin, which is surprising given its lower boost clock. This suggests the Broadwell architecture’s IPC is competitive with Coffee Lake in these specific workloads. The i7-6800K’s quad-channel memory support and 76.8 GB/s bandwidth, plus 28 PCIe lanes, make it better suited for memory-heavy applications and multi-GPU configurations. Its unlocked multiplier also offers overclocking headroom that the Xeon lacks.

The Intel Xeon E-2126G wins decisively in Geekbench single-core, scoring 26.5% higher than the i7-6800K. This is its standout advantage, driven by its 4.50 GHz boost clock. The Xeon also wins Geekbench multicore by a slim 1% margin, indicating that its higher clock speed can offset the thread deficit in some modern benchmarks. The Xeon’s integrated HD Graphics P630 provides a display output without a discrete GPU, which is useful for basic workstation tasks. Its ECC memory support and lower 80 W TDP make it attractive for reliability-focused, power-conscious server or workstation builds. The dual-channel memory and 16 PCIe lanes are more limited, but the Xeon’s 154 mm² die and newer Coffee Lake architecture suggest better power efficiency per unit of performance.

In summary, the i7-6800K is the choice for heavily multi-threaded rendering and compute workloads, while the Xeon E-2126G excels in single-thread performance and scenarios requiring ECC memory or integrated graphics. The 0.1% average score difference means most users would be hard-pressed to notice a real-world performance gap in general use.