CPU Comparison

The Intel Core i9-9900 and Intel Xeon E-2278G are two 8-core, 16-thread processors built on the same 14nm Coffee Lake architecture and sharing the same Intel Socket 1151 platform. The benchmark data shows a clear, if narrow, victory for the Core i9-9900 across every single test, with the largest margin appearing in the Geekbench multicore suite. The Xeon E-2278G offers a different set of platform capabilities, primarily ECC memory support, which positions it for workstation reliability rather than raw benchmark supremacy. For most users, the Core i9-9900 is the superior choice based on performance data alone; the Xeon E-2278G only becomes relevant when its specific server-oriented features are a hard requirement.

The Verdict

The data indicates that the Intel Core i9-9900 is the faster processor in every benchmark category recorded. It wins all eight head-to-head comparisons, with the most significant advantage being an 11.2% lead in Geekbench multicore. For desktop users seeking maximum performance in a Socket 1151 board, the Core i9-9900 is the clear pick. Its average benchmark score of 4163 places it in the 57th percentile of all CPUs, slightly ahead of the Xeon E-2278G’s 4052 average score.

The Xeon E-2278G is not a processor for those chasing benchmark records. Its wins are nonexistent in this dataset, but its value proposition lies entirely in its platform features. With ECC memory support and a market segment of Server/Workstation, it is designed for environments where data integrity and system stability are paramount over peak throughput. The Core i9-9900, with a Desktop market segment, is the better choice for content creation, gaming, and general high-performance desktop workloads. The choice is simple: pick the Core i9-9900 for performance, or the Xeon E-2278G for ECC memory support in a workstation build.

Architecture Differences

Despite their different market segments, the two processors share a striking amount of core architecture. Both are built on Intel's 14 nm process node and use the Coffee Lake architecture. The Core i9-9900 uses the Coffee Lake-R codename, while the Xeon E-2278G uses Coffee Lake-S WS, but their fundamental structure is identical. Each features 8 cores and 16 threads, with a base clock of 3.10 GHz for the Core i9-9900 and 3.40 GHz for the Xeon E-2278G. Both processors boost to the same 5.00 GHz maximum.

The cache hierarchy is also identical, with 64 KB of L1 cache per core, 256 KB of L2 cache per core, and a shared 16 MB L3 cache. The die size is nearly the same, with the Core i9-9900 measuring 180.3 mm² and the Xeon E-2278G at 180 mm². The key architectural differentiator is memory support. The Core i9-9900 does not support ECC memory, while the Xeon E-2278G does. This single feature defines the Xeon's workstation identity. The integrated graphics differ as well, with the Core i9-9900 featuring UHD Graphics 630 and the Xeon E-2278G using HD Graphics P630. Both use DDR4 memory in a dual-channel configuration with a 42.7 GB/s bandwidth, and both provide Gen 3 PCIe with 16 lanes from the CPU.

The power envelopes differ notably. The Core i9-9900 has a 65W TDP, while the Xeon E-2278G has a 95W TDP, reflecting the Xeon's higher base clock. Neither processor has an unlocked multiplier, so overclocking is not a differentiator. The production status for both is end-of-life, and their release dates are close, with the Core i9-9900 launching on 2019-04-22 and the Xeon E-2278G on 2019-05-28.

Where Each One Wins

Based on the benchmark data, the Core i9-9900 wins in every measured category. The most decisive victory is in Geekbench multicore, where it scores 8175 versus 7354 for the Xeon E-2278G, a delta of 11.2%. This suggests the Core i9-9900 has a significant advantage in workloads that scale across multiple cores, possibly due to different power management or thermal characteristics. The Geekbench singlecore test also favors the Core i9-9900, with a score of 1687 versus 1633, a 3.3% lead.

In the Cinebench tests, the differences are marginal. The Core i9-9900 edges out the Xeon E-2278G in Cinebench R15 multicore (1361 vs 1360), R20 multicore (5673 vs 5670), and R23 multicore (13509 vs 13502), each with a 0.1% delta. The singlecore scores in Cinebench are essentially tied, with R15 and R20 showing identical scores of 192 and 800, and R23 showing a 0.1% difference (1907 vs 1906). This indicates that in pure rendering tasks, the two processors are functionally equivalent.

The Xeon E-2278G's win is not in performance but in platform capability. Its ECC memory support is the sole feature that gives it an edge in specific use cases. For a server or workstation where a single-bit memory error could corrupt critical data, the Xeon E-2278G is the only choice between these two. The Core i9-9900, with its higher Geekbench scores, is better suited for desktop applications that benefit from raw compute power, such as video editing, 3D rendering, and software compilation.

FAQ

Q: Which processor has a higher base clock speed?

A: The Intel Xeon E-2278G has a base clock of 3.40 GHz, while the Intel Core i9-9900 has a base clock of 3.10 GHz. Both processors boost to 5.00 GHz.

Q: Does the Intel Core i9-9900 support ECC memory?

A: No, the Intel Core i9-9900 does not support ECC memory. The Intel Xeon E-2278G is the one with ECC memory support enabled.

Q: What is the performance difference in Geekbench multicore?

A: The Intel Core i9-9900 scores 8175 in Geekbench multicore, which is 11.2% higher than the Intel Xeon E-2278G's score of 7354.

Q: Which processor has a lower TDP?

A: The Intel Core i9-9900 has a TDP of 65W, which is lower than the Intel Xeon E-2278G's TDP of 95W.

Q: Are the cache sizes the same on both processors?

A: Yes, both processors have 64 KB of L1 cache per core, 256 KB of L2 cache per core, and a shared 16 MB L3 cache.

Q: In which benchmark does the Intel Core i9-9900 show the largest lead?

A: The largest lead for the Intel Core i9-9900 is in the Geekbench multicore test, where it outperforms the Intel Xeon E-2278G by 11.2%.

Head-to-Head Benchmarks

The head-to-head data reveals a pattern of near-identical performance in Cinebench workloads, with the Geekbench suite providing the only substantial separation. In Cinebench R15 multicore, the Core i9-9900 scores 1361 against the Xeon E-2278G's 1360, a 0.1% difference that is effectively a tie. The singlecore result in R15 is a perfect tie at 192 points for both processors. This pattern continues in Cinebench R20, where the multicore scores are 5673 and 5670, again a 0.1% delta, and the singlecore scores are both exactly 800.

The Cinebench R23 results follow the same trend. The Core i9-9900 posts a multicore score of 13509, narrowly beating the Xeon E-2278G's 13502, a 0.1% margin. The singlecore scores are 1907 and 1906, also a 0.1% difference. These results strongly suggest that the two chips are virtually indistinguishable in CPU-bound rendering tasks, likely due to their identical core counts, cache configurations, and boost clocks.

The Geekbench tests tell a different story. In Geekbench multicore, the Core i9-9900 achieves 8175, while the Xeon E-2278G manages 7354. This 11.2% delta is the largest in the dataset and indicates that the Core i9-9900 has a measurable advantage in workloads that Geekbench uses to simulate real-world applications. The Geekbench singlecore test also favors the Core i9-9900, with a score of 1687 versus 1633, a 3.3% lead. The reason for this divergence is not explicitly stated in the data, but the difference in TDP between the 65W Core i9-9900 and the 95W Xeon E-2278G may play a role in how the processors sustain performance under varying load conditions. Overall, the Core i9-9900 wins all eight head-to-head comparisons, but only the Geekbench multicore test shows a margin that would be noticeable in everyday use.