Intel Core i9-11900KB vs Intel Xeon E-2388G Comparison

FAQ

Q: Which processor has the higher boost clock speed?

A: The Intel Core i9-11900KB has a boost clock of 5.30 GHz, while the Intel Xeon E-2388G reaches 5.10 GHz. The Core i9 also has a slightly higher base clock at 3.30 GHz versus 3.20 GHz for the Xeon.

Q: Do both processors support ECC memory?

A: No. The Intel Xeon E-2388G supports ECC memory, which is typical for server and workstation parts. The Intel Core i9-11900KB does not support ECC memory.

Q: Which CPU has the larger L3 cache?

A: The Intel Core i9-11900KB has 24 MB of shared L3 cache, compared to 16 MB of shared L3 cache on the Intel Xeon E-2388G. The Core i9 also has a larger L2 cache at 1.25 MB per core versus 512 KB per core on the Xeon.

Q: What is the thermal design power difference between the two?

A: The Intel Xeon E-2388G is rated at 95 W TDP, while the Intel Core i9-11900KB is rated at 65 W TDP. This means the Core i9 is designed for a lower thermal envelope despite its higher clock speeds.

Q: Which processor wins in the recorded Cinebench benchmarks?

A: The Intel Xeon E-2388G wins all six recorded head-to-head benchmarks, including both single-core and multi-core tests across Cinebench R15, R20, and R23. The margins range from 3.1% to 3.3%.

Q: What are the market segments for these two Intel processors?

A: The Intel Xeon E-2388G is classified as a Server/Workstation processor and remains in active production. The Intel Core i9-11900KB is classified as a Mobile processor and is marked as End-of-life in the database.

Architecture Differences

The Intel Xeon E-2388G and Intel Core i9-11900KB represent two distinct branches of Intel's 11th generation lineup, and the recorded data shows several fundamental architectural divergences. The Xeon E-2388G is built on the Rocket Lake-E architecture, using a 14 nm process node with a die size of 276 mm². The Core i9-11900KB, by contrast, is built on the Tiger Lake-H architecture and uses a 10 nm process node with a smaller die size of 190 mm². Both are manufactured by Intel, but the process node difference is substantial: the Core i9 uses a more advanced 10 nm node while the Xeon relies on the mature 14 nm node.

The socket situation is entirely different as well. The Xeon E-2388G uses Intel Socket 1200, a socketed platform typical of workstation and server deployments. The Core i9-11900KB uses Intel BGA 1787, a ball-grid array package that is soldered directly to the motherboard, consistent with its mobile classification. This means the Xeon is field-replaceable on standard LGA1200 boards, while the Core i9 is tied to its carrier board.

Cache hierarchies also differ beyond the total L3 size. Both processors share the same L1 cache configuration at 80 KB per core. The L2 cache, however, is 512 KB per core on the Xeon and 1.25 MB per core on the Core i9, a meaningful difference for workloads that rely on high-speed local data. The L3 cache totals 16 MB shared on the Xeon and 24 MB shared on the Core i9. Despite the Core i9 having more cache at every level beyond L1, the Xeon still manages to win every recorded benchmark, which points to other factors such as memory latency characteristics, firmware behavior, or sustained power delivery.

Memory support is identical in terms of type and bus width: both support DDR4 in a dual-channel configuration with a recorded memory bandwidth of 51.2 GB/s. Both also offer PCIe Gen 4 with 20 lanes from the CPU. The integrated graphics differ slightly in naming: the Xeon carries UHD Graphics P750 while the Core i9 carries UHD Graphics 750. The Core i9 has an unlocked multiplier, whereas the Xeon E-2388G is locked. ECC memory support is present only on the Xeon, reflecting its server/workstation positioning.

Head-to-Head Benchmarks

The recorded head-to-head data is remarkably one-sided. The Intel Xeon E-2388G wins all six benchmark comparisons, and the margins are tightly clustered. In Cinebench R15 multi-core, the Xeon scores 2009 against 1946 for the Core i9, a 3.2% advantage. In Cinebench R15 single-core, the Xeon scores 283 against 274, a 3.3% edge. Moving to Cinebench R20, the Xeon posts 8374 in multi-core versus 8112, again 3.2% ahead, and 1181 in single-core versus 1145, a 3.1% lead. In Cinebench R23, the Xeon's multi-core score is 19939 against 19316, a 3.2% margin, and its single-core score is 2814 against 2727, also 3.2% ahead.

The consistency of these margins is notable. Across six different workload configurations, the Xeon's advantage never falls below 3.1% and never exceeds 3.3%. This suggests a systematic performance difference rather than workload-specific variation. The Core i9 has higher base and boost clocks, more L2 and L3 cache, and a more advanced 10 nm process node, yet it trails the Xeon in every recorded test. The 95 W TDP of the Xeon, compared to 65 W for the Core i9, may allow the Xeon to sustain higher all-core performance under load, which would explain the multi-core wins. But the single-core wins are more surprising given the Core i9's higher boost clock. The data does not explain the mechanism, but the outcome is clear.

A separate Geekbench measurement exists for the Xeon E-2388G, showing a multi-core score of 9615 and a single-core score of 2227. No corresponding Geekbench result is recorded for the Core i9-11900KB, so a direct comparison on that test is not possible from the database. The average benchmark score for the Xeon is 5805, while the Core i9 averages 5587, a difference of 218 points, or roughly 3.9% in favor of the Xeon.

Specification Differences

The two processors differ across several specification fields in the database. The base clock is 3.20 GHz for the Xeon E-2388G and 3.30 GHz for the Core i9-11900KB. Boost clock is 5.10 GHz versus 5.30 GHz. TDP is 95 W for the Xeon and 65 W for the Core i9. The socket differs: Intel Socket 1200 for the Xeon, Intel BGA 1787 for the Core i9. Architecture is Rocket Lake for the Xeon and Tiger Lake for the Core i9. Process node is 14 nm for the Xeon and 10 nm for the Core i9.

Die size is 276 mm² for the Xeon and 190 mm² for the Core i9. L2 cache is 512 KB per core on the Xeon versus 1.25 MB per core on the Core i9. L3 cache is 16 MB shared on the Xeon versus 24 MB shared on the Core i9. ECC memory support is present on the Xeon and absent on the Core i9. Integrated graphics are UHD Graphics P750 on the Xeon and UHD Graphics 750 on the Core i9. The multiplier is locked on the Xeon and unlocked on the Core i9. Market segment is Server/Workstation for the Xeon and Mobile for the Core i9. Production status is Active for the Xeon and End-of-life for the Core i9. Both share the same launch MSRP of $539, the same DDR4 dual-channel memory support, the same 51.2 GB/s memory bandwidth, and the same PCIe Gen 4 with 20 lanes.

The Verdict

The database paints a clear picture: the Intel Xeon E-2388G outperforms the Intel Core i9-11900KB in every recorded benchmark, despite the Core i9's higher clock speeds, larger caches, and newer process node. The Xeon's advantage ranges from 3.1% to 3.3% across Cinebench R15, R20, and R23 in both single-core and multi-core testing. Its average benchmark score of 5805 is 218 points higher than the Core i9's 5587. The Xeon also holds a 61st percentile ranking among all CPUs, matching the Core i9's percentile, but with a higher absolute average score.

The Core i9-11900KB is not without redeeming qualities in the specification sheet. It consumes less power at 65 W TDP, has a larger L2 and L3 cache, offers a higher boost clock, and includes an unlocked multiplier for overclocking. It is also built on a smaller 10 nm process with a smaller die. However, none of these advantages translate into benchmark wins in the recorded data. The Core i9 is also marked as End-of-life, while the Xeon remains in active production. For any workload represented by Cinebench, the Xeon E-2388G is the stronger performer.

Where Each One Wins

The Intel Xeon E-2388G wins every recorded performance test in the database. It leads by 3.2% in Cinebench R15 multi-core, 3.3% in Cinebench R15 single-core, 3.2% in Cinebench R20 multi-core, 3.1% in Cinebench R20 single-core, 3.2% in Cinebench R23 multi-core, and 3.2% in Cinebench R23 single-core. It also has the higher average benchmark score at 5805 versus 5587. In addition, the Xeon supports ECC memory, which is a critical feature for server and workstation reliability. It is socketed on Intel Socket 1200, making it serviceable in standard LGA1200 motherboards. Its production status is Active, meaning it remains a current product.

The Intel Core i9-11900KB wins in areas that do not appear in the benchmark results. It has a lower TDP at 65 W versus 95 W, which could be relevant for thermally constrained systems. It offers a higher base clock at 3.30 GHz and a higher boost clock at 5.30 GHz. Its cache hierarchy is larger, with 1.25 MB L2 per core and 24 MB shared L3. It uses a smaller 10 nm process node and a smaller die at 190 mm². It has an unlocked multiplier, which may appeal to users who plan to overclock. Its integrated graphics are listed as UHD Graphics 750, and it is classified as a mobile processor, suggesting it is intended for compact or portable platforms despite its BGA packaging.

For users who prioritize raw recorded performance, ECC memory support, or a socketed workstation platform, the data points to the Intel Xeon E-2388G. For users who prioritize lower power consumption, larger cache capacity, or an unlocked multiplier, the Intel Core i9-11900KB offers those specification advantages, even though they do not produce benchmark wins in the recorded Cinebench results.