Intel Core i9-11900KB vs Intel Core i9-7920X Comparison

The Intel Core i9-7920X and Intel Core i9-11900KB represent two very different approaches to high-end Intel computing, separated by process technology, platform philosophy, and nearly four years of architectural evolution. The data shows a consistent, if narrow, victory for the older 7920X across every benchmark recorded, yet the 11900KB counters with a dramatically lower power envelope and a mobile form factor. This analysis breaks down the benchmark results, architectural contrasts, and use-case implications strictly from the provided data.

Head-to-Head Benchmarks

The benchmark suite reveals a striking pattern: the Core i9-7920X wins all six recorded comparisons, but by a remarkably uniform margin. In Cinebench R15, the 7920X scores 2015 in multi-core against 1946 for the 11900KB, a 3.5% advantage. The single-core R15 test shows a nearly identical gap, with 284 versus 274, a 3.6% lead. This consistency continues through Cinebench R20, where the 7920X posts 8396 multi-core and 1185 single-core, versus 8112 and 1145 respectively, both again at 3.5% deltas. The R23 results mirror this exactly: 19991 against 19316 in multi-core, and 2822 against 2727 in single-core, with the same 3.5% delta.

The uniformity of these deltas is notable. Across all six benchmarks, the 7920X wins by either 3.5% or 3.6%, never more, never less. This suggests the advantage is structural rather than workload-specific. The 7920X edges ahead in every Cinebench iteration, from the older R15 to the newer R23, in both single-threaded and multi-threaded runs. The Geekbench results are only available for the 7920X, scoring 9297 multi-core and 1394 single-core; the 11900KB lacks these entries in the dataset, so no direct comparison is possible there. In terms of overall average benchmark scores, the 7920X sits at 5673, while the 11900KB trails at 5587, a difference of roughly 1.5%. Both CPUs occupy the same 61st percentile among all CPUs tracked.

The nearest rivals for each CPU further contextualize these scores. The 7920X's average of 5673 places it within 1% of the AMD EPYC 7F32 (5703) and AMD EPYC 7351 (5710), and within 1.1% of the AMD Ryzen 7 PRO 3700 (5610). The 11900KB's 5587 average sits just 0.4% below the same Ryzen 7 PRO 3700 (5610) and 0.3% below the Intel Core i7-12700T (5606). This means the 7920X is competitive with server-grade EPYC parts, while the 11900KB aligns more with mid-range desktop and mobile chips.

Architecture Differences

The two processors are built on fundamentally different architectures. The 7920X uses the Skylake-X design, fabricated on Intel's 14 nm process with a die size of 484 mm². It is a desktop part from the Core i9 X-Series 7th Gen family, released in September 2017. The 11900KB employs the Tiger Lake-H architecture on a 10 nm process, with a significantly smaller die at 190 mm². It belongs to the Core 11th Gen series, targeting mobile platforms despite its Core i9 branding.

Core counts differ substantially. The 7920X provides 12 cores and 24 threads, while the 11900KB offers 8 cores and 16 threads. This 50% core advantage for the 7920X is offset by the 11900KB's higher clock speeds: the 11900KB runs at a 3.30 GHz base and 5.30 GHz boost, versus 2.90 GHz base and 4.40 GHz boost for the 7920X. The newer chip's 10 nm process allows it to achieve these higher frequencies within a 65 W TDP, compared to the 7920X's 140 W TDP. This is a massive efficiency gap: the 11900KB delivers roughly 96-97% of the 7920X's performance while drawing less than half the thermal budget.

Cache configurations also diverge. The 7920X has 64 KB of L1 per core, 1 MB of L2 per core, and 16.5 MB of shared L3. The 11900KB improves per-core cache with 80 KB L1 and 1.25 MB L2, and provides a larger 24 MB shared L3 pool. The 11900KB's L3 advantage of 7.5 MB is significant, though the 7920X's extra cores and threads still carry the day in multi-threaded workloads. Memory support shows another split: the 7920X features quad-channel DDR4 with 85.3 GB/s bandwidth, while the 11900KB uses dual-channel DDR4 at 51.2 GB/s. PCIe connectivity also differs, with the 7920X offering Gen 3 with 44 lanes (CPU only) versus the 11900KB's Gen 4 with 20 lanes (CPU only). The 11900KB includes integrated UHD Graphics 750, while the 7920X has no integrated graphics.

Where Each One Wins

The 7920X wins every single benchmark in the dataset, but the margins are narrow. In multi-core Cinebench tests, the extra 4 cores and 8 threads provide a consistent edge, but the 11900KB's higher clocks and newer architecture keep the gap to just 3.5%. The single-core tests tell a similar story: the 7920X leads by 3.5-3.6%, despite the 11900KB's 900 MHz higher boost clock. This suggests the Skylake-X architecture has excellent single-thread efficiency per clock, or the Tiger Lake-H design does not scale perfectly to its maximum boost in these tests.

The 11900KB's wins are not in raw performance but in efficiency and platform characteristics. Its 65 W TDP versus 140 W makes it suitable for compact or thermally constrained systems. The integrated UHD Graphics 750 provides display output without a discrete GPU, which the 7920X cannot offer. The 11900KB also supports PCIe Gen 4, doubling the per-lane bandwidth of the 7920X's Gen 3, and its 20 lanes, while fewer, may suffice for modern GPUs and NVMe drives. The 11900KB's smaller 190 mm² die and 10 nm process indicate a more modern manufacturing approach, even though the 7920X's larger 484 mm² die allows for more cores.

For workloads that scale with core count — rendering, video encoding, scientific simulation — the 7920X holds a slight edge. For single-threaded tasks like gaming or lightly threaded applications, the benchmark data still favors the 7920X, though the 11900KB's higher clocks and larger L3 cache could theoretically compete better in scenarios not captured by Cinebench. The 11900KB's dual-channel memory and lower bandwidth cap its memory-intensive performance, while the 7920X's quad-channel setup provides a significant data throughput advantage.

FAQ

Q: Which CPU has higher multi-core performance?

A: The Intel Core i9-7920X wins all multi-core Cinebench tests. In R23, it scores 19991 against 19316 for the 11900KB, a 3.5% advantage. The R20 and R15 multi-core tests show the same 3.5% delta (8396 vs 8112 and 2015 vs 1946, respectively).

Q: Is the 11900KB faster in single-core workloads?

A: No. Despite its higher 5.30 GHz boost clock versus 4.40 GHz for the 7920X, the 11900KB loses all single-core Cinebench tests. The R23 single-core score is 2822 for the 7920X and 2727 for the 11900KB, a 3.5% margin.

Q: How do the power requirements compare?

A: The 7920X has a 140 W TDP, while the 11900KB has a 65 W TDP. This means the 11900KB delivers nearly identical benchmark scores while consuming less than half the thermal design power.

Q: What are the core and thread counts?

A: The 7920X has 12 cores and 24 threads. The 11900KB has 8 cores and 16 threads. The 7920X's 4 extra cores and 8 extra threads contribute to its multi-core wins.

Q: Do these CPUs have integrated graphics?

A: Only the 11900KB includes integrated graphics, specifically UHD Graphics 750. The 7920X has no integrated graphics and requires a discrete GPU for display output.

Q: Which CPU has better memory bandwidth?

A: The 7920X supports quad-channel DDR4 with 85.3 GB/s bandwidth. The 11900KB uses dual-channel DDR4 with 51.2 GB/s. The 7920X's memory bandwidth is roughly 67% higher.

Specification Differences

The two CPUs differ across nearly every major specification. The 7920X uses a 14 nm process with a 484 mm² die, while the 11900KB uses 10 nm with a 190 mm² die. Core counts are 12 versus 8, threads 24 versus 16. Base clocks are 2.90 GHz versus 3.30 GHz, and boost clocks are 4.40 GHz versus 5.30 GHz. TDP is 140 W versus 65 W. Sockets are Intel Socket 2066 for the 7920X and Intel BGA 1787 for the 11900KB.

Cache hierarchies differ: the 7920X has 64 KB L1 per core, 1 MB L2 per core, and 16.5 MB shared L3; the 11900KB has 80 KB L1, 1.25 MB L2, and 24 MB shared L3. Memory bus widths are quad-channel versus dual-channel, with corresponding bandwidth of 85.3 GB/s versus 51.2 GB/s. PCIe support is Gen 3 with 44 lanes versus Gen 4 with 20 lanes. Integrated graphics are absent on the 7920X and present as UHD Graphics 750 on the 11900KB. Market segments are Desktop for the 7920X and Mobile for the 11900KB. The 7920X has a release date of September 2017; the 11900KB has no release date in the data. The launch MSRP for the 7920X is $1199, and for the 11900KB it is $539.

The Verdict

The benchmark data presents a clear, if narrow, winner: the Intel Core i9-7920X outperforms the Intel Core i9-11900KB in every recorded Cinebench test, with margins consistently between 3.5% and 3.6%. This holds true for both single-core and multi-core workloads, making the 7920X the better choice for raw computational performance. Its 12 cores and 24 threads, quad-channel memory, and 44 PCIe Gen 3 lanes provide a more expansive platform for heavy workloads.

However, the 11900KB offers a compelling counter-argument. Its 65 W TDP versus 140 W means dramatically lower power consumption and heat output, enabling smaller form factors and quieter operation. The integrated UHD Graphics 750 eliminates the need for a discrete GPU in basic systems. The PCIe Gen 4 support provides newer connectivity, and the larger 24 MB L3 cache may benefit certain workloads. Its launch MSRP of $539 is also substantially lower than the 7920X's $1199, though pricing is not the focus of this analysis.

The choice depends on priorities. For maximum multi-threaded throughput in a desktop workstation, the 7920X wins on all measured benchmarks. For an efficient, compact system with modern connectivity and integrated graphics, the 11900KB delivers 96-97% of the same performance at less than half the TDP. Users who can leverage the 7920X's extra cores and memory bandwidth will see the benefit; those who prioritize efficiency and platform modernity should consider the 11900KB, accepting the slight performance deficit documented across all six benchmark comparisons.