Intel Core i7-5820K vs Intel Xeon E-2226G Comparison

The data gives this comparison a clean verdict: the Intel Xeon E-2226G wins every recorded head-to-head benchmark against the Intel Core i7-5820K, by a consistent margin of roughly eleven percent. Both chips carry six cores, and both are end-of-life Intel parts, but the newer Coffee Lake design outperforms the older Haswell-E flagship in every Cinebench test the database holds, despite the i7-5820K having twelve threads to the Xeon's six. What the 5820K offers instead is a platform advantage, quad-channel memory bandwidth and an unlocked multiplier, that keeps it relevant for specific workloads.

Head-to-Head Benchmarks

The sweep is total. In Cinebench R15 multi-core, the E-2226G scores 944 against the 5820K's 841, a 10.9 percent gap. Single-core R15 goes the same way, 133 versus 118, an 11.3 percent difference that represents the largest lead in the dataset. Cinebench R20 multi-core lands at 3934 for the Xeon against 3508 for the Core i7, a 10.8 percent delta, and R20 single-core repeats the pattern at 555 versus 495, again 10.8 percent.

Cinebench R23, the heaviest render test recorded, is no different. The E-2226G posts 9368 multi-core points to the 5820K's 8354, and 1322 single-core points to 1179, both 10.8 percent apart. Six benchmarks, six Xeon wins, zero for the Core i7.

The consistency of that margin is the telling detail. A gap that holds steady at roughly eleven percent across single- and multi-core tests indicates an architectural clock-and-efficiency advantage rather than a scaling artifact. The Xeon achieves this with half the thread count, six threads against twelve, which means its per-thread throughput is dramatically higher. Hyper-Threading on the 5820K simply cannot compensate for a boost clock of 4.70 GHz against 3.60 GHz on a node two generations newer.

Context from the wider database reinforces how closely matched these two sit overall. The 5820K averages 2642 across its recorded tests and sits at the 49th percentile of all CPUs, with rivals like the Xeon E-2274G (average score 2643, delta 0 percent), the Core i9-8950HK (2641, 0.1 percent) and the Core i7-7740X (2648, -0.2 percent) clustered within a fraction of a percent. The E-2226G averages 2709 and ranks at the 50th percentile, bracketed by the Ryzen 5 PRO 5650U (2713, -0.2 percent), the Xeon E5-2640 v3 (2703, 0.2 percent) and the Xeon D-1577 (2715, -0.2 percent). Both are mid-pack CPUs by modern standards; the Xeon is simply the mid-pack CPU that wins this pairing.

Architecture Differences

The i7-5820K is a Haswell-E part built on Intel's 22 nm process, with a die size of 356 mm² and 2,600 million transistors. The Xeon E-2226G is a Coffee Lake-S WS workstation derivative on the 14 nm node with a 154 mm² die. The newer, denser process is the foundation for the Xeon's frequency advantage: a 3.40 GHz base and 4.70 GHz boost, against 3.30 GHz base and 3.60 GHz boost for the 5820K.

Thread topology diverges sharply. The 5820K pairs its six cores with Hyper-Threading for twelve threads. The E-2226G runs six threads on six cores with no SMT recorded. Cache tells a mixed story: the 5820K carries more L3, 15 MB shared versus 12 MB, while L1 (64 KB per core) and L2 (256 KB per core) are identical between the two.

The memory subsystem is where the older chip fights back. The 5820K's quad-channel DDR4 controller delivers 68.3 GB/s of bandwidth, dwarfing the Xeon's dual-channel 42.7 GB/s. The 5820K also provides 28 PCIe Gen 3 lanes from the CPU against 16 on the Xeon, a meaningful difference for multi-GPU or heavy add-in-card configurations.

Feature splits favor the Xeon on platform security and efficiency: it supports ECC memory, includes HD Graphics P630 integrated graphics, and carries an 80 W TDP versus the 5820K's 140 W. The 5820K counters with an unlocked multiplier for overclocking, which the locked Xeon cannot match. Sockets are incompatible, Socket 2011-3 for the Core i7 and Socket 1151 for the Xeon, so neither drops into the other's board. The Xeon launched at a $255 launch MSRP; no launch MSRP is recorded for the 5820K.

Where Each One Wins

The E-2226G owns every rendering and throughput scenario in the database. Content creation in Cinebench, from R15 through R23, single- and multi-threaded alike, goes to the Xeon by 10.8 to 11.3 percent. Any workload dominated by per-core speed benefits from the same frequency lead, and ECC support plus integrated graphics make it the natural fit for an entry workstation or a server node where memory integrity matters and a discrete GPU is optional.

The 5820K's case rests on platform resources rather than benchmark scores. Its 68.3 GB/s of quad-channel bandwidth suits memory-hungry workloads that saturate the Xeon's dual-channel bus. Its 28 CPU PCIe lanes accommodate densely populated expansion setups that 16 lanes cannot. Its unlocked multiplier allows tuning beyond the stock 3.60 GHz boost, a lever the locked Xeon does not offer, and its 15 MB of L3 gives it a larger shared cache for working sets that overflow the Xeon's 12 MB. None of that translates into a recorded benchmark win here, but the raw data shows the 5820K trading blows with parts like the Core i7-7740X (within 0.2 percent), confirming it remains competitive on its own terms.

FAQ

Q: Does the Core i7-5820K win any benchmark against the Xeon E-2226G?

A: No. The Xeon wins all six recorded head-to-head tests, with margins between 10.8 and 11.3 percent.

Q: How can the Xeon win multi-core tests with only six threads against twelve?

A: Its 4.70 GHz boost on the 14 nm Coffee Lake architecture delivers far higher per-thread throughput than the 5820K's 3.60 GHz boost on 22 nm Haswell, more than offsetting the 5820K's Hyper-Threading advantage. It wins Cinebench R23 multi-core 9368 to 8354.

Q: Which chip has better memory bandwidth?

A: The i7-5820K, clearly. Its quad-channel controller provides 68.3 GB/s versus 42.7 GB/s for the Xeon's dual-channel setup.

Q: Does either CPU support ECC memory?

A: Only the Xeon E-2226G. The 5820K has ECC support recorded as false.

Q: Can you overclock these processors?

A: The 5820K has an unlocked multiplier. The E-2226G is locked.

Q: Are both CPUs still in production?

A: No. Both are listed as end-of-life; the 5820K was released in 2014 and the E-2226G in 2019.

The Verdict

Based purely on the recorded data, the Xeon E-2226G is the stronger processor. It wins every benchmark, does so at an 80 W TDP versus 140 W, adds ECC memory support and integrated graphics, and sits half a percentile higher in the database rankings. For rendering, general compute, and workstation duty, it is the clear pick.

The i7-5820K earns a narrower recommendation: choose it only where its platform advantages matter, specifically quad-channel memory bandwidth of 68.3 GB/s, 28 PCIe Gen 3 lanes, the larger 15 MB L3 cache, or an unlocked multiplier for overclocking. In stock benchmark performance it concedes roughly eleven percent across the board, and that gap is consistent enough that no recorded workload favors it.

Specification Differences

| Field | Intel Core i7-5820K | Intel Xeon E-2226G |

|---|---|---|

| Architecture | Haswell | Coffee Lake |

| Codename | Haswell-E | Coffee Lake-S WS |

| Series | Not recorded | Xeon E-2200 series |

| Threads | 12 | 6 |

| Base clock | 3.30 GHz | 3.40 GHz |

| Boost clock | 3.60 GHz | 4.70 GHz |

| TDP | 140 W | 80 W |

| Socket | Socket 2011-3 | Socket 1151 |

| Process node | 22 nm | 14 nm |

| Die size | 356 mm² | 154 mm² |

| Transistors | 2,600 million | Not recorded |

| L3 cache | 15 MB (shared) | 12 MB (shared) |

| Memory bus | Quad-channel | Dual-channel |

| Memory bandwidth | 68.3 GB/s | 42.7 GB/s |

| ECC memory | No | Yes |

| PCIe | Gen 3, 28 lanes (CPU only) | Gen 3, 16 lanes (CPU only) |

| Integrated graphics | None | HD Graphics P630 |

| Market segment | Desktop | Server/Workstation |

| Release date | 2014 | 2019 |

| Launch MSRP | Not recorded | $255 |

| Multiplier unlocked | Yes | No |

| Part number | SR20S | SRF7F |