Intel Core i9-9820X vs Intel Xeon E-2378G Comparison

The Verdict

The recorded data points to a clear, though narrow, overall winner: the Intel Xeon E-2378G. It wins all six head-to-head benchmark comparisons against the Intel Core i9-9820X, with deltas ranging from 2.8% to 3%. Its average benchmark score of 5199 also sits above the i9-9820X's 5049, a difference of roughly 3% in aggregate performance. However, the i9-9820X is not obsolete; it counters with more cores, more threads, a wider memory bus, and more PCIe lanes. The Xeon is the pick for users who prioritize single-threaded responsiveness and newer platform features, while the i9-9820X remains relevant for workloads that can exploit its additional cores and quad-channel memory bandwidth, despite its lower per-clock efficiency.

FAQ

Q: Which processor has the higher boost clock, and what is the difference?

A: The Intel Xeon E-2378G has a boost clock of 5.10 GHz, while the Intel Core i9-9820X reaches 4.20 GHz. The Xeon's boost advantage is 0.90 GHz.

Q: Does the Xeon E-2378G support error-correcting memory?

A: Yes, the Xeon E-2378G supports ECC memory. The Core i9-9820X does not list ECC memory support in the database.

Q: How do the two processors compare in multi-core Cinebench R23?

A: The Xeon E-2378G scores 17974 in Cinebench R23 multi-core, while the Core i9-9820X scores 17459. The Xeon leads by 515 points, a delta of 2.9%.

Q: Which processor has more PCIe lanes, and what generation?

A: The Core i9-9820X provides 44 PCIe Gen 3 lanes, while the Xeon E-2378G provides 20 PCIe Gen 4 lanes. The i9-9820X offers more lanes, but the Xeon uses a newer generation.

Q: What is the difference in their memory channels?

A: The Xeon E-2378G uses dual-channel memory with a bandwidth of 51.2 GB/s. The Core i9-9820X uses quad-channel memory with a bandwidth of 85.3 GB/s.

Q: Are both processors on the same manufacturing process?

A: Yes, both the Xeon E-2378G and the Core i9-9820X are built on Intel's 14 nm process node.

Architecture Differences

The two chips belong to different architectural families, which explains their contrasting strengths. The Xeon E-2378G is a Rocket Lake-E part, built on the Rocket Lake architecture, and carries the codename Rocket Lake-E. It fits into the Xeon E-2300 series, targeting the server and workstation segment. In contrast, the Core i9-9820X is a Skylake-X part from the Core i9 X-Series 9th Gen family, built on the older Skylake architecture. Its market segment is desktop, and it is now end-of-life per the production status in the database.

A notable difference is the integrated graphics. The Xeon E-2378G includes UHD Graphics P750, whereas the Core i9-9820X has no integrated graphics listed. This means the Xeon can drive a display without a discrete GPU, while the i9-9820X always requires one. The Xeon also supports ECC memory, a feature absent on the Core i9-9820X, aligning with its server positioning.

The cache hierarchies differ. The Xeon E-2378G has 80 KB of L1 cache per core, 512 KB of L2 cache per core, and 16 MB of shared L3 cache. The Core i9-9820X has 64 KB of L1 per core, a larger 1 MB of L2 per core, and 16.5 MB of shared L3 cache. The i9-9820X's larger L2 cache per core could help certain workloads, but the Xeon's higher clock speeds may compensate.

The sockets are incompatible. The Xeon E-2378G uses Intel Socket 1200, while the Core i9-9820X uses Intel Socket 2066. This means they cannot be swapped into the same motherboard, and platform choice is a primary deciding factor. The Xeon also has a smaller die size of 276 mm², while the i9-9820X's die size is not recorded.

Specification Differences

Several key specifications separate these two processors. The Xeon E-2378G has 8 cores and 16 threads, while the Core i9-9820X has 10 cores and 20 threads. The i9-9820X offers 25% more cores and threads, which is significant for parallel workloads. However, the Xeon has higher clocks: a base of 2.80 GHz versus 3.30 GHz for the i9-9820X, and a boost of 5.10 GHz versus 4.20 GHz. The Xeon's boost advantage is 0.90 GHz.

The thermal design power (TDP) differs substantially. The Xeon E-2378G is rated at 80 W, while the Core i9-9820X is rated at 165 W. The Xeon is much more power-efficient on paper, which can translate to lower cooling requirements and operating costs. The i9-9820X has a higher power envelope to feed its additional cores.

Memory architecture is another split. The Xeon uses dual-channel DDR4 with a bandwidth of 51.2 GB/s. The i9-9820X uses quad-channel DDR4 with a bandwidth of 85.3 GB/s, offering 66.7% more bandwidth. The i9-9820X also provides 44 PCIe Gen 3 lanes, while the Xeon provides 20 PCIe Gen 4 lanes. The Xeon's lanes are newer and faster per lane, but the i9-9820X has more lanes for expansion.

The multiplier is unlocked on the Core i9-9820X, allowing overclocking, while the Xeon E-2378G has a locked multiplier. The i9-9820X also launched at a higher MSRP of $889, versus $494 for the Xeon, though pricing analysis is not the focus here. The release dates show the Xeon is newer, released in 2021, while the i9-9820X launched in 2018. Production status differs as well: the Xeon is active, the i9-9820X is end-of-life.

Head-to-Head Benchmarks

The benchmark results are consistent across all six Cinebench tests. The Xeon E-2378G wins every single test, with deltas clustering around 3%. In Cinebench R15 multi-core, the Xeon scores 1811 against the i9-9820X's 1759, a 3% advantage. In R15 single-core, the Xeon scores 255 against 248, a 2.8% lead. The R20 multi-core test shows the Xeon at 7549 versus 7332, a 3% edge. In R20 single-core, the Xeon scores 1065 versus 1034, again a 3% lead. The R23 multi-core test has the Xeon at 17974 versus 17459, a 2.9% advantage. Finally, R23 single-core shows the Xeon at 2537 versus 2464, a 3% margin.

The pattern is striking: the Xeon leads by nearly the same percentage in both single-core and multi-core tests. This suggests the performance gap is driven by clock speed and architectural efficiency rather than core count. The i9-9820X has 2 more cores, but the Xeon's 5.10 GHz boost clock and newer Rocket Lake architecture overcome that deficit. The Xeon's single-core advantage in R23 is 73 points, and in multi-core it is 515 points. The i9-9820X's extra cores cannot compensate for the Xeon's higher per-thread performance.

The average benchmark scores reinforce this. The Xeon E-2378G has an average benchmark score of 5199, which places it slightly above its nearest rival, the Intel Core i5-13400T, which scores 5210, a delta of -0.2%. The i9-9820X has an average score of 5049, placing it just below the Intel Core i9-12900TE, which scores 5050, a delta of 0%. Both processors sit at the 60th percentile among all CPUs, indicating similar overall standing in the database, but the Xeon's higher average score is decisive.

Where Each One Wins

The Intel Xeon E-2378G wins in every measured benchmark, but its victories have specific implications. It is the better choice for tasks that depend on single-threaded performance, such as lightly threaded applications, legacy software, or gaming workloads where high boost clocks matter. Its 5.10 GHz boost clock and 2.8% to 3% single-core lead over the i9-9820X make it the more responsive processor for interactive tasks. The Xeon also supports ECC memory, which is critical for data integrity in servers and workstations. Its lower TDP of 80 W versus 165 W suggests it can be cooled by simpler, quieter solutions, and it includes integrated graphics, eliminating the need for a discrete GPU in basic systems.

The Intel Core i9-9820X, despite losing all six benchmarks, retains clear advantages in specific areas. It has 10 cores and 20 threads versus 8 cores and 16 threads, offering 25% more parallel capacity. This can benefit heavily threaded workloads such as video rendering, 3D simulation, or scientific computing, where the i9-9820X's 3% deficit in Cinebench scores may be offset by better scaling in other applications not recorded here. Its quad-channel memory provides 85.3 GB/s of bandwidth, a 66.7% advantage over the Xeon's 51.2 GB/s, which is valuable for memory-intensive tasks like large dataset processing or virtual machines. The 44 PCIe Gen 3 lanes allow for more expansion cards, GPUs, or NVMe drives, making it a stronger platform for multi-GPU configurations or heavy I/O setups. The unlocked multiplier also permits overclocking, which could narrow or reverse the performance gap in the hands of an enthusiast.

The data suggests a split decision based on workload. For users on the Xeon E-2300 platform who need ECC, integrated graphics, and high clock speeds, the Xeon E-2378G is the clear winner. For users on the Skylake-X platform who need maximum cores, memory bandwidth, and expansion capability, the Core i9-9820X remains a viable option despite its benchmark losses. The Xeon wins the head-to-head tests, but the i9-9820X wins on platform features that the benchmarks do not fully capture.