Intel Core Ultra 5 245KF vs Intel Core Ultra X9 388H Comparison

The Intel Core Ultra 5 245KF and the Intel Core Ultra X9 388H represent two distinct approaches from Intel: a desktop-first design with high power limits and a mobile-focused part built for efficiency. The benchmark data shows a decisive performance gap, but the X9 388H holds a specific advantage in one physics workload. The following analysis uses recorded measurements to compare these two processors across compute, memory, and platform features.

Head-to-Head Benchmarks

The benchmark results are overwhelmingly in favor of the Intel Core Ultra 5 245KF. Across the seventeen recorded head-to-head tests, the 245KF wins sixteen, with the only exception being a single PassMark physics test. The most dramatic difference appears in Cinebench R23 single-core, where the 245KF scores 5173 against 2200.5 for the X9 388H, a delta of 135.1%. This is not a marginal gap; it indicates a fundamental difference in per-core execution capability.

The multi-core tests show a similar pattern, though the margins vary. In Cinebench R23 multi-core, the 245KF delivers 36647 points versus 18911 for the X9 388H, a 93.8% advantage. That result dwarfs the Cinebench R20 multi-core gap, where the 245KF scores 15391 against 13101, a 17.5% lead. The Cinebench R15 multi-core test shows the 245KF at 3693 versus 2955, a 25% lead. The data suggests that the R23 multi-core workload is particularly favorable to the 245KF, likely due to sustained boost behavior under longer loads.

Single-core performance across other Cinebench versions reinforces the 245KF's dominance. In Cinebench R15 single-core, the 245KF scores 521 against 309.5, a 68.3% lead. Cinebench R20 single-core shows 2172 versus 1849, a 17.5% lead. These results indicate that the 245KF's higher base and boost clocks, 4.20 GHz and 5.20 GHz respectively, translate directly into superior per-thread performance compared to the X9 388H's 2.10 GHz base and 5.10 GHz boost.

PassMark tests also lean heavily toward the 245KF, but with smaller margins than Cinebench. Data compression shows 460123 versus 361763, a 27.2% lead. Data encryption scores 33381 versus 28490, a 17.2% lead. Extended instructions, which reflect SIMD and specialized instruction throughput, show 37912 versus 29943, a 26.6% lead. Integer math is the closest PassMark result, with 98854 versus 90882, an 8.8% lead. Floating-point math shows 131546 versus 112550, a 16.9% lead. Random string sorting shows 55206 versus 44010, a 25.4% lead. The PassMark multithread score is 43110 versus 36811, a 17.1% lead.

The sole X9 388H win is in PassMark physics, where it scores 3226 against 2998, a 7.1% advantage. This is a narrow margin, and it stands in contrast to the rest of the data. The physics test may favor the X9 388H's 16 cores versus the 245KF's 14 cores, but the overall multithread results do not support a consistent core-count advantage for the X9 388H. The 245KF wins the PassMark multithread test by 17.1%, which suggests that its higher clocks and better scaling outweigh the two-core deficit.

The average benchmark scores place the 245KF at 55093, versus 44466 for the X9 388H. The 245KF sits in the 91st percentile of all CPUs, while the X9 388H sits in the 88th. The nearest rivals for the 245KF include the AMD Ryzen 9 9900X3D at 54762 (0.6% delta) and the Intel Core Ultra 5 245K at 54053 (1.9% delta). The X9 388H's nearest rivals include the AMD Ryzen 5 7500X3D at 44573 (-0.2% delta) and the Intel Core i9-13950HX at 44342 (0.3% delta). These deltas show that the 245KF competes with high-end desktop parts, while the X9 388H aligns with mid-range desktop and high-end mobile parts.

FAQ

Q: Which processor has the higher single-core performance?

A: The Intel Core Ultra 5 245KF wins every recorded single-core test. In Cinebench R23 single-core, it scores 5173 versus 2200.5 for the X9 388H, a 135.1% lead. In PassMark single-thread, the 245KF scores 4715 versus 4280, a 10.2% lead.

Q: Does the X9 388H win any benchmark at all?

A: Yes, the X9 388H wins the PassMark physics test with a score of 3226 versus 2998, a 7.1% advantage. This is the only one of the seventeen head-to-head tests that it wins.

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

A: The 245KF leads in all multi-core Cinebench tests. Cinebench R23 multi-core shows 36647 versus 18911, a 93.8% lead. Cinebench R20 multi-core shows 15391 versus 13101, a 17.5% lead. Cinebench R15 multi-core shows 3693 versus 2955, a 25% lead. PassMark multithread also favors the 245KF, 43110 versus 36811, a 17.1% lead.

Q: What is the difference in core and thread counts?

A: The X9 388H has 16 cores and 16 threads. The 245KF has 14 cores and 14 threads. Despite having two fewer cores, the 245KF posts higher multi-core scores in every recorded test except the PassMark physics test.

Q: Which processor has a higher boost clock?

A: The 245KF has a boost clock of 5.20 GHz. The X9 388H has a boost clock of 5.10 GHz. The 245KF also has a much higher base clock at 4.20 GHz versus 2.10 GHz.

Q: What is the memory bandwidth difference?

A: The X9 388H supports LPDDR5X memory with a recorded bandwidth of 153.6 GB/s. The 245KF supports DDR5 memory with a recorded bandwidth of 102.4 GB/s. The X9 388H has a 50% higher memory bandwidth figure.

The Verdict

The data points to a clear performance hierarchy. The Intel Core Ultra 5 245KF is the faster processor in nearly every recorded workload. It leads by double-digit percentages in most Cinebench and PassMark tests, and its 91st percentile ranking versus 88th confirms its higher standing. The 245KF's single-core advantage is particularly large, with the Cinebench R23 single-core delta at 135.1%. This makes it the preferred choice for desktop users who prioritize raw compute throughput, especially in single-threaded applications that dominate many productivity tasks.

The Intel Core Ultra X9 388H, however, is not without merit. Its 153.6 GB/s memory bandwidth is a significant spec advantage over the 245KF's 102.4 GB/s. It also includes integrated graphics, specifically an Arc B390, while the 245KF has no integrated graphics. The X9 388H's 25 W TDP versus 125 W for the 245KF indicates a far lower power envelope, which is critical for mobile platforms. The PassMark physics win, while narrow, shows that its 16-core layout can win specific workloads.

For a desktop builder looking at the 245KF, the choice is straightforward: it delivers higher scores across the board, and its unlocked multiplier allows for overclocking. For a laptop designer considering the X9 388H, the trade-off is clear: lower performance but far lower power consumption, plus integrated graphics and higher memory bandwidth. The data does not support the X9 388H as a performance competitor to the 245KF. Instead, it positions the X9 388H as a mobile processor that offers balanced capabilities within a constrained power budget.

Specification Differences

The two processors differ in nearly every major specification category. The 245KF has 14 cores and 14 threads, while the X9 388H has 16 cores and 16 threads. The 245KF has a base clock of 4.20 GHz and a boost clock of 5.20 GHz. The X9 388H has a base clock of 2.10 GHz and a boost clock of 5.10 GHz. The 245KF has a TDP of 125 W, while the X9 388H has a TDP of 25 W.

Socket and platform differ. The 245KF uses Intel Socket 1851, a desktop socket, while the X9 388H uses Intel BGA 2540, a ball-grid array for mobile. The 245KF has an unlocked multiplier, while the X9 388H does not. Memory support differs: the 245KF uses DDR5 with dual-channel bus and 102.4 GB/s bandwidth. The X9 388H uses LPDDR5X with dual-channel bus and 153.6 GB/s bandwidth.

PCIe lanes differ. The 245KF provides Gen 5 with 20 lanes (CPU only). The X9 388H provides Gen 5 with 4 lanes (CPU only). Integrated graphics differ: the 245KF has none, while the X9 388H includes an Arc B390. The 245KF has a launch MSRP of $294; the X9 388H has no recorded launch MSRP.

Architecture Differences

The 245KF is built on the Arrow Lake architecture, specifically Arrow Lake-S, and belongs to the Core Ultra Series 2. The X9 388H is built on the Panther Lake architecture, specifically Panther Lake-H, and belongs to the Core Ultra Series 3. Both use a 3 nm process node, but the foundries differ: the 245KF is fabricated by TSMC, while the X9 388H is fabricated by Intel.

The 245KF has a transistor count of 17,800 million and a die size of 243 mm². The X9 388H has no recorded transistor count or die size. Cache configurations differ. Both have 192 KB of L1 per core and 3 MB of L2 per core. The 245KF has 24 MB of shared L3 cache, while the X9 388H has 18 MB of shared L3 cache.

Neither processor supports ECC memory. The 245KF has a part number of SRQCY and was released on 2024-10-23. The X9 388H has a part number of SA4QWQ9EK and was released on 2026-01-04. Both are listed as Active in production status. The 245KF has a market segment of Desktop, while the X9 388H has a market segment of Mobile.

Where Each One Wins

The 245KF wins in all compute-heavy workloads that the benchmark data covers. It leads in Cinebench R15, R20, and R23, both single-core and multi-core. It leads in PassMark data compression, encryption, extended instructions, prime numbers, floating-point math, integer math, multithread, random string sorting, and single-thread. The 245KF also wins the PassMark multithread test, despite having two fewer cores than the X9 388H.

The X9 388H wins only the PassMark physics test, with a 7.1% margin. That test is often sensitive to memory latency and specific instruction patterns, and the X9 388H's higher memory bandwidth of 153.6 GB/s may contribute. The X9 388H also holds spec advantages that do not appear in the compute benchmarks: integrated graphics, a lower TDP of 25 W, and a mobile socket for compact systems.

The practical split is clear. The 245KF is for desktop workloads that demand maximum multi-threaded and single-threaded speed, such as rendering, compilation, and high-refresh gaming. Its 125 W TDP and Socket 1851 place it in a power-hungry but capable desktop platform. The X9 388H is for mobile systems where power efficiency and integrated graphics matter more than peak compute. Its 16 cores and 153.6 GB/s memory bandwidth give it a balanced profile, but the recorded data shows that the 245KF outperforms it in 16 of 17 head-to-head tests.