Intel Core i9-9900T vs Intel Xeon E-2186G Comparison

Head-to-Head Benchmarks

The recorded data presents a clear split between the two processors. Across the eight benchmark comparisons, the Intel Xeon E-2186G claims seven victories, while the Intel Core i9-9900T manages a single, but substantial, win. The most notable result is in Geekbench multicore, where the i9-9900T scores 7298 against the Xeon's 6204, a decisive 17.6% advantage. This is the largest delta recorded in the entire head-to-head set, and it stands in stark contrast to the pattern seen in the Cinebench tests.

In every Cinebench iteration, the Xeon E-2186G holds a consistent lead of approximately 3.5%. The multicore scores show the Xeon at 1158 versus 1117 in R15, 4826 versus 4658 in R20, and 11492 versus 11091 in R23. The single-core Cinebench results follow the same trend: the Xeon leads by 3.7% in R15 (163 vs. 157) and by 3.5% in both R20 (681 vs. 657) and R23 (1622 vs. 1565). This uniformity across different Cinebench versions suggests a stable performance relationship in that specific workload, rather than a random fluctuation.

The Geekbench single-core test breaks the pattern slightly. Here, the Xeon wins again, but with a narrower margin of 6.3%, scoring 1550 against the i9-9900T's 1452. This is a larger single-core gap than the Cinebench results show, indicating that the Xeon's clock advantage translates differently depending on the benchmark's demands. The overall picture is that the Xeon E-2186G dominates the Cinebench suite and the single-core Geekbench test, while the i9-9900T delivers a commanding win in the Geekbench multicore workload. The average benchmark scores reflect this mixed outcome, with the i9-9900T at 3499 and the Xeon at 3462, a difference of just over 1% in favor of the Core part, despite its 1-7 loss in head-to-head tests.

Architecture Differences

Both processors are built on Intel's 14 nm process and use the Coffee Lake architecture, but they target different market segments with distinct configurations. The Intel Core i9-9900T is a desktop part with 8 cores and 16 threads, while the Intel Xeon E-2186G is a server or workstation chip with 6 cores and 12 threads. The core count difference is central to their behavior. The i9-9900T has a base clock of 2.10 GHz and a boost clock of 4.40 GHz, whereas the Xeon E-2186G starts at 3.80 GHz and boosts to 4.70 GHz. The Xeon's higher clocks explain its wins in single-threaded and lightly threaded tests, while the i9-9900T's additional two cores and four threads provide the foundation for its Geekbench multicore victory.

The cache hierarchies also differ. Both share 64 KB of L1 and 256 KB of L2 per core, but the L3 cache is larger on the i9-9900T at 16 MB shared, compared to 12 MB shared on the Xeon. The i9-9900T also has a larger die size at 180.3 mm² versus 154 mm² for the Xeon. The thermal design power (TDP) is a major differentiator: the i9-9900T is rated at 35 watts, while the Xeon E-2186G draws 95 watts. This explains the i9-9900T's much lower base clock, as it is clearly tuned for efficiency in a constrained thermal envelope.

Memory support is another key split. Both support DDR4 memory over a dual-channel bus with a bandwidth of 42.7 GB/s. However, the Xeon E-2186G supports ECC memory, while the i9-9900T does not. This is a critical feature for workstation and server reliability. Integrated graphics differ as well, with the i9-9900T using UHD Graphics 630 and the Xeon using HD Graphics P630. Both connect via PCIe Gen 3 with 16 lanes from the CPU. The Xeon E-2186G belongs to the Xeon E-2100 series with a Coffee Lake-S WS codename, while the i9-9900T is part of the Core i9 Coffee Lake Refresh generation, codenamed Coffee Lake-R. Neither processor has an unlocked multiplier, so overclocking is not an option for either.

Where Each One Wins

The performance data points to distinct use cases for each processor. The Intel Xeon E-2186G wins in all Cinebench tests, both single-core and multicore, as well as in Geekbench single-core. This suite of wins suggests it is the stronger choice for applications that rely on high clock speeds and moderate thread counts. The consistent 3.5% advantage in Cinebench multicore is notable because the Xeon accomplishes this with fewer cores, relying instead on its higher base and boost clocks. For workloads that are latency-sensitive or depend on single-thread performance, such as certain legacy applications or lightly threaded tasks, the Xeon's data is clearly superior.

The Intel Core i9-9900T wins the Geekbench multicore test by a wide margin. The 17.6% lead in that benchmark indicates that the additional cores and threads are highly effective in this specific workload. The 16 MB of shared L3 cache, larger than the Xeon's 12 MB, may also contribute to its performance in cache-sensitive scenarios. This makes the i9-9900T the better option for heavily parallel workloads that scale well with core count, such as rendering or compilation tasks that are structured like the Geekbench multicore test.

The thermal characteristics reinforce this split. The i9-9900T's 35 watt TDP is unusually low for an 8-core part, making it suitable for compact or passively cooled systems where heat dissipation is a challenge. The Xeon E-2186G's 95 watt TDP requires more robust cooling but enables its higher sustained clock speeds. The ECC memory support on the Xeon is a deciding factor for error-sensitive environments like data processing or long-running compute jobs. The i9-9900T, without ECC, is more aligned with consumer desktop use, despite its competitive multicore showing.

FAQ

Q: Which processor has a higher single-core performance?

A: The Intel Xeon E-2186G wins all single-core benchmarks. It leads by 3.7% in Cinebench R15 (163 vs. 157), by 3.5% in R20 (681 vs. 657), by 3.5% in R23 (1622 vs. 1565), and by 6.3% in Geekbench single-core (1550 vs. 1452).

Q: How do the two compare in multicore performance?

A: The results are mixed. The Xeon E-2186G wins all three Cinebench multicore tests by about 3.5% (R15: 1158 vs. 1117, R20: 4826 vs. 4658, R23: 11492 vs. 11091). The Core i9-9900T wins Geekbench multicore by 17.6% (7298 vs. 6204).

Q: What is the difference in core and thread counts?

A: The Intel Core i9-9900T has 8 cores and 16 threads. The Intel Xeon E-2186G has 6 cores and 12 threads.

Q: Do both processors support ECC memory?

A: No. The Intel Xeon E-2186G supports ECC memory. The Intel Core i9-9900T does not.

Q: What are the clock speeds of each processor?

A: The i9-9900T has a base clock of 2.10 GHz and a boost clock of 4.40 GHz. The Xeon E-2186G has a base clock of 3.80 GHz and a boost clock of 4.70 GHz.

Q: Which processor has the larger L3 cache?

A: The Intel Core i9-9900T has 16 MB of shared L3 cache. The Intel Xeon E-2186G has 12 MB of shared L3 cache.

The Verdict

The data does not point to a single outright winner; the choice depends on the workload. For users prioritizing single-threaded speed and consistent performance across Cinebench-style rendering tasks, the Intel Xeon E-2186G is the clear choice. Its higher clock speeds deliver a 3.5% to 6.3% advantage in all single-core tests and a 3.5% lead in Cinebench multicore, despite having fewer cores. The ECC memory support adds reliability for workstation use, and the 95 watt TDP reflects its focus on sustained performance over efficiency.

For users who need maximum throughput in Geekbench multicore-style workloads, the Intel Core i9-9900T is the better option. Its 17.6% lead in that specific test is substantial and directly tied to its 8-core, 16-thread configuration. The larger 16 MB L3 cache and the dramatically lower 35 watt TDP make it attractive for power-constrained builds. However, its lower clocks mean it loses every single-core benchmark and the entire Cinebench suite. The i9-9900T is the choice for parallel processing in an efficient package, while the Xeon E-2186G is the choice for clock-sensitive tasks and ECC reliability. The average benchmark scores are close, 3499 for the i9-9900T and 3462 for the Xeon, but the distribution of wins tells the real story.

Specification Differences

| Specification | Intel Core i9-9900T | Intel Xeon E-2186G |

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

| Cores | 8 | 6 |

| Threads | 16 | 12 |

| Base Clock | 2.10 GHz | 3.80 GHz |

| Boost Clock | 4.40 GHz | 4.70 GHz |

| TDP | 35 W | 95 W |

| L3 Cache | 16 MB (shared) | 12 MB (shared) |

| Die Size | 180.3 mm² | 154 mm² |

| ECC Memory | No | Yes |

| Integrated Graphics | UHD Graphics 630 | HD Graphics P630 |

| Market Segment | Desktop | Server/Workstation |

| Codename | Coffee Lake-R | Coffee Lake-S WS |

| Generation | Core i9 (Coffee Lake Refresh) | Xeon E (Coffee Lake) |

| Series | None | Xeon E-2100 series |

| Release Date | 2019-04-22 | 2018-05-30 |

| Launch MSRP | $423 | $506 |

| Part Number | SRG1B | SR3WR |