Intel Core i9-10900X vs Intel Core i9-11900KB Comparison

The Intel Core i9-11900KB and Intel Core i9-10900X are two very different interpretations of the "Core i9" badge, and the benchmark data reflects that. The 11900KB wins all six head-to-head Cinebench comparisons, but the margins are remarkably thin, with every delta falling between 1.9% and 2.0%. The 10900X counters with a 10-core/20-thread configuration versus the 8-core/16-thread 11900KB, yet it still trails in every single test. The verdict is clear: the newer Tiger Lake-H chip is the better performer across the board in the tested workloads, but the margins are small enough that the 10900X's additional cores and desktop platform traits might still matter for specific uses. Both chips sit at the 61st percentile among all CPUs, and their average benchmark scores are nearly identical (5587 vs 5555), so the data shows a statistical tie in overall standing despite the head-to-head sweep.

The Verdict

From the data, the Intel Core i9-11900KB is the winner in every benchmark where the two are directly compared. It leads the 10900X by 1.9% in Cinebench R15 multi-core (1946 vs 1910) and single-core (274 vs 269), by 1.9% in R20 multi-core (8112 vs 7961) and 2.0% in R20 single-core (1145 vs 1123), and by 1.9% in R23 multi-core (19316 vs 18957) and single-core (2727 vs 2676). The pattern is consistent and unambiguous. However, the 10900X is not obsolete; its 10 cores and 20 threads give it a structural advantage in heavily parallel workloads that the 11900KB's 8 cores and 16 threads cannot simply erase with a higher boost clock. The 11900KB's boost clock is 5.30 GHz versus 4.70 GHz for the 10900X, and that clock advantage appears to be the deciding factor in these Cinebench runs. For a user who prioritizes the fastest possible single-threaded response or who needs a lower-power mobile part, the 11900KB is the pick. For a user who values the headroom of two extra physical cores and a quad-channel memory bus, the 10900X remains a viable desktop option, despite losing the head-to-head.

Where Each One Wins

The 11900KB wins in every scenario that the Cinebench suite measures, which includes both multi-threaded and single-threaded rendering workloads. Its single-core wins (274 vs 269, 1145 vs 1123, 2727 vs 2676) show a 1.9-2.0% edge that comes directly from its 5.30 GHz boost clock. The multi-core wins (1946 vs 1910, 8112 vs 7961, 19316 vs 18957) are more surprising given the 10900X's two extra cores, but the 11900KB's newer 10 nm Tiger Lake architecture and higher clocks compensate for the core deficit. The 10900X does not win a single benchmark in the head-to-head data. Its advantages lie outside Cinebench: it supports quad-channel DDR4 memory versus the 11900KB's dual-channel, and it has a higher base clock of 3.70 GHz versus 3.30 GHz. The 10900X also offers Gen 3 PCIe lanes, while the 11900KB offers Gen 4 with 20 lanes, which is a feature difference that could matter for storage or GPU bandwidth in specific builds. The 10900X is a 165 W desktop part, while the 11900KB is a 65 W mobile part, so the desktop chip has more thermal and power headroom for sustained all-core loads, even if the benchmark scores do not reflect that advantage in these particular tests.

Architecture Differences

The 11900KB is built on Intel's 10 nm process node and uses the Tiger Lake-H architecture, while the 10900X is a 14 nm Cascade Lake-X part. This is a generational leap in manufacturing technology, and the die size reflects it: the 11900KB has a 190 mm² die, while the 10900X has no recorded die size in the data. The 11900KB has 8 cores and 16 threads, with a base clock of 3.30 GHz and a boost of 5.30 GHz, and a TDP of 65 W. The 10900X has 10 cores and 20 threads, a base of 3.70 GHz, a boost of 4.70 GHz, and a TDP of 165 W. The cache layouts differ substantially: the 11900KB uses 80 KB of L1 per core and 1.25 MB of L2 per core, with 24 MB of shared L3. The 10900X uses 64 KB of L1 per core and 1 MB of L2 per core, with 19.25 MB of shared L3. The 11900KB also has a smaller per-core cache footprint but a larger total L3 pool. The 11900KB includes integrated UHD Graphics 750, while the 10900X has no integrated graphics. The 11900KB is a mobile-segment part on an Intel BGA 1787 socket, while the 10900X is a desktop part on Intel Socket 2066. Both have unlocked multipliers, but the 10900X is marked as active in production while the 11900KB is end-of-life.

FAQ

Q: Which processor has the higher boost clock?

A: The Intel Core i9-11900KB has a boost clock of 5.30 GHz, while the Intel Core i9-10900X boosts to 4.70 GHz.

Q: How many cores and threads does each processor have?

A: The 11900KB has 8 cores and 16 threads. The 10900X has 10 cores and 20 threads.

Q: Which processor wins in multi-core Cinebench R23?

A: The 11900KB wins with a score of 19316, beating the 10900X's 18957 by a margin of 1.9%.

Q: What is the memory channel difference between the two?

A: The 11900KB supports dual-channel DDR4 memory, while the 10900X supports quad-channel DDR4 memory. The 11900KB has a recorded memory bandwidth of 51.2 GB/s; the 10900X has no bandwidth figure in the data.

Q: Do both processors have integrated graphics?

A: No. The 11900KB includes UHD Graphics 750, while the 10900X has no integrated graphics listed.

Q: What is the TDP difference?

A: The 11900KB has a TDP of 65 W, while the 10900X has a TDP of 165 W.

Q: Which processor has a higher average benchmark score?

A: The 11900KB has an average benchmark score of 5587, while the 10900X has an average of 5555. The 11900KB also has a slightly higher percentile rank at 61, same as the 10900X.

Head-to-Head Benchmarks

The Cinebench R15 multi-core test sets the tone: the 11900KB scores 1946, the 10900X scores 1910, giving the 11900KB a 1.9% lead. The single-core R15 result is nearly identical in percentage, with 274 versus 269, again a 1.9% edge. Moving to Cinebench R20, the multi-core gap widens slightly: 8112 versus 7961 is a 1.9% advantage, while the single-core test shows 1145 versus 1123, a 2.0% lead. Cinebench R23, the most demanding of the trio, follows the same script: 19316 versus 18957 in multi-core (1.9%) and 2727 versus 2676 in single-core (1.9%). The 10900X's only recorded benchmark outside Cinebench is Geekbench, where it scores 10104 multi-core and 1438 single-core, but there is no Geekbench result for the 11900KB in the head-to-head data, so no comparison is possible there. The consistency of the 1.9-2.0% margins across all six tests suggests a fixed performance differential, likely driven by the 11900KB's 0.60 GHz boost clock advantage. The 10900X's two extra cores and 20 threads do not translate into any Cinebench win, which indicates that the 11900KB's per-core efficiency, enabled by the 10 nm process and newer Tiger Lake architecture, overcomes the core-count deficit. The 10900X's higher base clock of 3.70 GHz does not help in these tests, as the 11900KB's 3.30 GHz base is compensated by a much higher boost ceiling.

Specification Differences

The two processors diverge on nearly every hardware specification. The 11900KB has 8 cores and 16 threads; the 10900X has 10 cores and 20 threads. The 11900KB's base clock is 3.30 GHz versus 3.70 GHz for the 10900X, but the boost clocks reverse the order: 5.30 GHz for the 11900KB versus 4.70 GHz for the 10900X. The TDP difference is stark: 65 W for the 11900KB, 165 W for the 10900X. The 11900KB uses an Intel BGA 1787 socket and targets the mobile segment, while the 10900X uses Intel Socket 2066 and targets the desktop segment. The 11900KB is built on a 10 nm process with a 190 mm² die; the 10900X uses a 14 nm process with no die size recorded. Cache configs differ: the 11900KB has 80 KB L1 per core, 1.25 MB L2 per core, and 24 MB shared L3; the 10900X has 64 KB L1 per core, 1 MB L2 per core, and 19.25 MB shared L3. Memory support is DDR4 for both, but the bus width differs: dual-channel for the 11900KB versus quad-channel for the 10900X, with the 11900KB having a recorded bandwidth of 51.2 GB/s and the 10900X having none listed. The 11900KB offers PCIe Gen 4 with 20 lanes, while the 10900X offers PCIe Gen 3 with no lane count. The 11900KB has integrated UHD Graphics 750; the 10900X has no integrated graphics. The 11900KB is end-of-life with a launch MSRP of $539 and part number SRKU4; the 10900X is active in production with no launch MSRP or part number recorded. Both have unlocked multipliers, but the 11900KB is from the 11th Gen Core series with Tiger Lake architecture, while the 10900X is from the 10th Gen X-Series with Cascade Lake architecture.