Intel Core i9-10900KF vs Intel Core i9-7920X Comparison

Where Each One Wins

The benchmark split between these two Intel processors is unusually clean. The Intel Core i9-7920X wins six of the eight head-to-head tests, while the Intel Core i9-10900KF takes two. The separation is not random: it follows the workload type almost perfectly.

The i9-7920X dominates every Cinebench test, both multi-core and single-core. In Cinebench R15, R20, and R23, the 7920X wins all six variants. The margins are consistent at 6% across every Cinebench test. That includes single-threaded tests where the 10900KF has a much higher boost clock, and multi-threaded tests where the 7920X has two extra cores. The consistency of that 6% delta across all Cinebench workloads suggests an architectural advantage that scales evenly regardless of thread count.

The i9-10900KF counters in Geekbench. It wins Geekbench multi-core by 13.4% and Geekbench single-core by 20.1%. Those are substantial margins, and they flip the overall picture. The database records the 7920X with a 61st percentile against all CPUs, while the 10900KF sits at the 60th percentile. The average benchmark score for the 7920X is 5673, versus 5316 for the 10900KF. So the aggregate numbers favor the older X-series part, but the Geekbench results show the 10900KF is clearly the stronger performer in that specific test suite.

The use-case split is straightforward. Rendering workloads, especially those that mirror Cinebench's rendering engine, favor the 7920X. General system benchmarks, which Geekbench models, favor the 10900KF. The 7920X has 12 cores and 24 threads, while the 10900KF has 10 cores and 20 threads. The 7920X also has a larger L2 cache per core at 1 MB versus 256 KB, and a quad-channel memory bus versus dual-channel. Those hardware differences align with the benchmark results.

The 10900KF's wins are not small. A 20.1% single-core advantage in Geekbench is significant. The 7920X's Cinebench wins are smaller at 6%, but they are universal across every Cinebench test. For users whose primary application is Cinebench-like rendering, the 7920X is the clear choice. For users who care about Geekbench-style mixed workloads, the 10900KF pulls ahead.

Architecture Differences

The two CPUs come from different Intel generations and use different sockets. The i9-7920X is a Skylake-X part from the Core i9 X-Series 7th Generation, built on Intel's 14 nm process. It uses Intel Socket 2066. The i9-10900KF is a Comet Lake part from the Core 10th Generation, also on 14 nm, but it uses Intel Socket 1200. Both are end-of-life products with unlocked multipliers.

Core counts differ: the 7920X has 12 cores and 24 threads, while the 10900KF has 10 cores and 20 threads. Clock speeds are where the 10900KF counters: its base clock is 3.70 GHz and boost clock is 5.30 GHz, versus 2.90 GHz base and 4.40 GHz boost for the 7920X. The 10900KF's boost advantage is nearly a full gigahertz.

Cache layouts are notably different. The 7920X has 64 KB of L1 per core and 1 MB of L2 per core, with 16.5 MB of shared L3. The 10900KF has 64 KB of L1 per core and 256 KB of L2 per core, with 20 MB of shared L3. The 7920X's per-core L2 is four times larger, which helps in certain workloads. The 10900KF's total L3 is larger by 3.5 MB.

Memory support diverges sharply. Both support DDR4, but the 7920X has a quad-channel memory bus with 85.3 GB/s of bandwidth. The 10900KF has a dual-channel bus with 46.9 GB/s. That is a massive bandwidth gap. The 7920X also has 44 PCIe Gen 3 lanes (CPU only), while the 10900KF has 16 PCIe Gen 3 lanes. Neither supports ECC memory.

The 7920X has a larger die at 484 mm², while the 10900KF's die size is not recorded. TDP differs: 140 W for the 7920X versus 125 W for the 10900KF. The 10900KF's launch MSRP is $509. The 7920X's launch MSRP is $1199.

The release dates are far apart. The 7920X launched on 2017-09-09, the 10900KF on 2020-04-29. Both are marked end-of-life in the database. The part numbers are SR3NG for the 7920X and SRH92 for the 10900KF.

Head-to-Head Benchmarks

The head-to-head data is remarkably consistent in Cinebench. The 7920X wins Cinebench R15 multi-core with a score of 2015 against 1901, a 6% margin. Cinebench R15 single-core goes 284 to 268, also 6%. Cinebench R20 multi-core is 8396 against 7924, another 6%. Cinebench R20 single-core is 1185 to 1118, 6% again. Cinebench R23 multi-core is 19991 versus 18867, 6%. Cinebench R23 single-core is 2822 to 2663, 6%. Every Cinebench test, regardless of thread count or generation of the benchmark, produces exactly a 6% delta in favor of the 7920X.

That uniformity is striking. In six different Cinebench workloads, the relative performance gap does not change at all. It suggests the 7920X's advantage in this rendering engine is structural, not dependent on the specific workload mix. The extra two cores and larger L2 cache likely explain the consistency.

Geekbench tells a different story. The 10900KF wins Geekbench multi-core with 10733 against 9297, a 13.4% margin. Geekbench single-core goes 1744 to 1394, a 20.1% margin. These are the only two tests where the 10900KF wins, but they are decisive.

The Geekbench results are harder to explain with the raw specs. The 10900KF has fewer cores, a smaller L2 per core, and half the memory bandwidth. Yet it wins multi-core by 13.4%. The boost clock difference likely matters: 5.30 GHz versus 4.40 GHz is a large gap. The 10900KF also has 20 MB of shared L3 versus 16.5 MB. Geekbench appears to reward the higher clocks and larger L3 more than the 7920X's core count and memory bandwidth.

The delta between the two CPUs' average benchmark scores is 357 points in favor of the 7920X. The 7920X's nearest rivals include the AMD EPYC 7F32 at 5703 (0.5% behind the 7920X), the AMD EPYC 7351 at 5710 (0.6% behind), the AMD Ryzen Threadripper 2920X at 5730 (1% behind), and the AMD Ryzen 7 PRO 3700 at 5610 (1.1% ahead of the 7920X). The 10900KF's nearest rivals include the AMD EPYC 7281 at 5315 (0% delta), the AMD Ryzen Threadripper 1920X at 5306 (0.2% behind the 10900KF), the Intel Core i9-9900X at 5301 (0.3% behind), and the Intel Core i9-13900TE at 5342 (0.5% ahead). These rival deltas are all within about 1%, meaning both CPUs sit in tightly contested performance territory.

FAQ

Q: Which CPU is faster in Cinebench?

A: The Intel Core i9-7920X wins all six Cinebench tests. It scores 2015 versus 1901 in R15 multi-core, 284 versus 268 in R15 single-core, 8396 versus 7924 in R20 multi-core, 1185 versus 1118 in R20 single-core, 19991 versus 18867 in R23 multi-core, and 2822 versus 2663 in R23 single-core. Every margin is 6%.

Q: Which CPU is faster in Geekbench?

A: The Intel Core i9-10900KF wins both Geekbench tests. It scores 10733 versus 9297 in multi-core, a 13.4% margin, and 1744 versus 1394 in single-core, a 20.1% margin.

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

A: The Intel Core i9-7920X has 12 cores and 24 threads. The Intel Core i9-10900KF has 10 cores and 20 threads.

Q: What are the memory channel and bandwidth differences?

A: The Intel Core i9-7920X supports quad-channel DDR4 with 85.3 GB/s of bandwidth. The Intel Core i9-10900KF supports dual-channel DDR4 with 46.9 GB/s of bandwidth.

Q: What are the boost clock speeds?

A: The Intel Core i9-7920X boosts to 4.40 GHz. The Intel Core i9-10900KF boosts to 5.30 GHz. The 10900KF also has a higher base clock at 3.70 GHz versus 2.90 GHz.

Q: How do the cache configurations compare?

A: The Intel Core i9-7920X has 64 KB of L1 and 1 MB of L2 per core, with 16.5 MB of shared L3. The Intel Core i9-10900KF has 64 KB of L1 and 256 KB of L2 per core, with 20 MB of shared L3.

The Verdict

The benchmark data supports a clear split based on workload. For Cinebench-style rendering, the Intel Core i9-7920X is the better processor. It wins every Cinebench test by 6%, from single-core R15 to multi-core R23. The consistency of that margin across six tests is the strongest signal in the entire comparison. The 7920X's 12 cores, 24 threads, 1 MB L2 per core, and quad-channel memory with 85.3 GB/s of bandwidth all support this result.

For Geekbench-style workloads, the Intel Core i9-10900KF is the better processor. It wins multi-core by 13.4% and single-core by 20.1%. The 10900KF's 5.30 GHz boost clock and 20 MB of shared L3 likely drive those results. The 10900KF also has the lower launch MSRP at $509, while the 7920X launched at $1199.

Users who prioritize rendering performance in Cinebench-like applications should choose the 7920X. Users who prioritize Geekbench-style mixed workloads should choose the 10900KF. The aggregate average benchmark score favors the 7920X at 5673 versus 5316, and the 7920X holds a 61st percentile versus the 10900KF's 60th. But the average masks the workload-specific divergence. The 7920X is a rendering specialist with a wider memory bus and more cores. The 10900KF is a clock-speed specialist with a higher boost and larger L3.

Both CPUs are end-of-life, so the choice is about existing platforms or used purchases. The 7920X requires Intel Socket 2066, the 10900KF requires Intel Socket 1200. The 7920X offers 44 PCIe Gen 3 lanes and quad-channel memory, making it the stronger platform for I/O-heavy and memory-bandwidth-sensitive tasks. The 10900KF offers a much higher boost clock and a larger L3 cache, making it stronger for latency-sensitive and lightly threaded workloads.

The data does not crown a single winner. The 7920X wins six head-to-head tests, the 10900KF wins two. But the two Geekbench wins are large, and the six Cinebench wins are uniform at 6%. The right choice depends entirely on the target application. For rendering, the 7920X. For Geekbench-style general performance, the 10900KF.