Intel Core 7 251E vs Intel Core Ultra X9 388H Comparison

Head-to-Head Benchmarks

The Intel Core Ultra X9 388H is the only one of these two processors with recorded benchmark data, and that data is substantial. The Core Ultra X9 388H holds an average benchmark score of 44,466, placing it at the 88th percentile of all CPUs in the database. The Intel Core 7 251E has no benchmark scores recorded, an average score of 0, and sits at the 50th percentile. This means every performance comparison between the two is one-sided, with the Core Ultra X9 388H delivering the only measurable results.

The Core Ultra X9 388H posts strong multi-core results across Cinebench versions. In Cinebench R15 multicore it scores 2,955, in R20 multicore it reaches 13,101, and in R23 multicore it peaks at 18,911. These scores indicate a capable multi-threaded workload performer, especially considering the processor's 16 cores and 16 threads. The single-core results follow a similar pattern: 309.5 in Cinebench R15, 1,849 in R20, and 2,200.5 in R23. The R23 single-core score of 2,200.5 is particularly notable, as it demonstrates strong per-thread performance from the 3 nm Panther Lake architecture.

PassMark tests add further detail. The Core Ultra X9 388H scores 36,811 in multithread, 4,280 in single-thread, and 4,280 in the single-thread variant test. Integer math reaches 90,882, floating point math hits 112,550, and extended instructions score 29,943. Data compression scores 361,763, data encryption scores 28,490, and random string sorting scores 44,010. Physics processing returns 3,226, and prime number finding returns 358. These numbers paint a picture of a balanced mobile processor that handles both integer and floating-point workloads competently.

Relative to its nearest rivals in the database, the Core Ultra X9 388H is essentially at parity. The AMD Ryzen 5 7500X3D scores 44,573, which is 0.2% higher. The Intel Core i9-13950HX scores 44,342, which is 0.3% lower. The AMD Ryzen AI Max 385 scores 44,309, 0.4% lower, and the Intel Core i5-13600 scores 44,240, 0.5% lower. The Core Ultra X9 388H therefore sits in a tightly contested cluster where no rival is more than half a percent away. This is a narrow margin band, and the differences are within typical run-to-run variance.

The Intel Core 7 251E has zero benchmark wins and zero benchmark losses recorded, as it has no scores at all. The head-to-head benchmark table is empty. Consequently, the data cannot show any scenario where the Core 7 251E outperforms the Core Ultra X9 388H in a measured test. The only conclusions available are that the Core Ultra X9 388H has verified performance data and the Core 7 251E does not, at least not in the current database.

Architecture Differences

The two processors come from fundamentally different design lineages. The Intel Core 7 251E uses Bartlett Lake architecture, is built on a 10 nm process node, and is produced by Intel. It has a die size of 257 mm². The Intel Core Ultra X9 388H uses Panther Lake architecture with the Panther Lake-H generation designation, is built on a 3 nm process node, and is also produced by Intel. The die size for the Core Ultra X9 388H is not recorded. The process node difference is stark: 10 nm versus 3 nm, which indicates a significant generational leap in manufacturing density for the Core Ultra X9 388H.

Core and thread counts differ substantially. The Core 7 251E has 24 cores and 32 threads, while the Core Ultra X9 388H has 16 cores and 16 threads. The Core 7 251E therefore offers 50% more cores and exactly double the threads. This suggests the Core 7 251E relies on simultaneous multithreading to reach its thread count, whereas the Core Ultra X9 388H does not use SMT at all. The Core Ultra X9 388H is labeled as part of the Core Ultra Series 3, while the Core 7 251E carries no series designation.

Cache layouts diverge as well. The Core 7 251E has 80 KB of L1 cache per core, 2 MB of L2 cache per core, and 36 MB of shared L3 cache. The Core Ultra X9 388H has 192 KB of L1 per core, 3 MB of L2 per core, and 18 MB of shared L3. Per-core L1 and L2 are larger on the Core Ultra X9 388H, but total L3 is exactly double on the Core 7 251E. The larger shared L3 on the Core 7 251E likely benefits workloads with large working sets, while the larger per-core caches on the Core Ultra X9 388H may favor single-threaded responsiveness.

Memory support differs entirely. The Core 7 251E supports DDR4 and DDR5 memory, running on a dual-channel bus with a memory bandwidth of 89.6 GB/s. The Core Ultra X9 388H supports LPDDR5X memory, also on a dual-channel bus, but with a memory bandwidth of 153.6 GB/s. That is a 71% bandwidth advantage for the Core Ultra X9 388H. ECC memory is supported by the Core 7 251E but not by the Core Ultra X9 388H.

PCIe configurations also differ. The Core 7 251E provides Gen 5 with 16 CPU-only lanes, while the Core Ultra X9 388H provides Gen 5 with only 4 CPU-only lanes. The Core 7 251E has far more direct PCIe connectivity, which matters for desktop expansion. Integrated graphics differ as well: the Core 7 251E uses UHD Graphics 770, while the Core Ultra X9 388H uses Arc B390.

The market segments and sockets reflect their intended use. The Core 7 251E is a desktop processor on Intel Socket 1700. The Core Ultra X9 388H is a mobile processor on Intel BGA 2540, meaning it is soldered to the board. The Core 7 251E has a base clock of 2.10 GHz and a boost clock of 5.60 GHz. The Core Ultra X9 388H has the same base clock of 2.10 GHz but a lower boost clock of 5.10 GHz. The Core 7 251E has a TDP of 65, while the Core Ultra X9 388H has a TDP of 25, indicating the mobile part is designed for significantly lower thermal output. The release dates differ: the Core 7 251E was released on 2025-01-12, and the Core Ultra X9 388H on 2026-01-04. Both are currently active in production, and neither has an unlocked multiplier.

The Verdict

The data strongly favors the Intel Core Ultra X9 388H for any user who needs verified performance. It has a full suite of benchmark scores across Cinebench R15, R20, R23, and PassMark tests, and it sits at the 88th percentile of all CPUs. Its nearest rivals are within 0.5% in either direction, which means it is competitive with the AMD Ryzen 5 7500X3D, the Intel Core i9-13950HX, the AMD Ryzen AI Max 385, and the Intel Core i5-13600. The Core Ultra X9 388H is a proven quantity.

The Intel Core 7 251E, by contrast, has no benchmark data in the database. Its average benchmark score is 0, and it sits at the 50th percentile. That percentile is not a performance rating; it is a default position for a processor without measurements. Users who rely on recorded data cannot confirm any performance level for the Core 7 251E. The processor offers more cores (24 versus 16), more threads (32 versus 16), a higher boost clock (5.60 GHz versus 5.10 GHz), and double the L3 cache (36 MB versus 18 MB), but none of that is validated by benchmark results.

For users who prioritize verified multi-threaded performance, mobile efficiency, and high memory bandwidth, the Core Ultra X9 388H is the clear choice. For users who need a desktop processor with broad PCIe connectivity, ECC memory support, and a larger L3 cache, the Core 7 251E has appealing specifications, but the lack of benchmark data means those specs cannot be quantified. The recorded data shows no scenario where the Core 7 251E outperforms the Core Ultra X9 388H, simply because the Core 7 251E has no scores.

Specification Differences

The following specification fields differ between the Intel Core 7 251E and the Intel Core Ultra X9 388H:

• Cores: 24 (Core 7 251E) versus 16 (Core Ultra X9 388H)
• Threads: 32 versus 16
• Boost clock: 5.60 GHz versus 5.10 GHz
• TDP: 65 versus 25
• Socket: Intel Socket 1700 versus Intel BGA 2540
• Architecture: Bartlett Lake versus Panther Lake
• Process node: 10 nm versus 3 nm
• Die size: 257 mm² versus not recorded
• L1 cache per core: 80 KB versus 192 KB
• L2 cache per core: 2 MB versus 3 MB
• L3 cache shared: 36 MB versus 18 MB
• Memory support: DDR4, DDR5 versus LPDDR5X
• Memory bandwidth: 89.6 GB/s versus 153.6 GB/s
• ECC memory: true versus false
• PCIe lanes (CPU only): 16 versus 4
• Integrated graphics: UHD Graphics 770 versus Arc B390
• Market segment: Desktop versus Mobile
• Release date: 2025-01-12 versus 2026-01-04
• Launch MSRP: $384 versus not recorded
• Part number: SRQDUQ657 versus SA4QWQ9EK

Fields that are the same include base clock (2.10 GHz), memory bus type (dual-channel), PCIe generation (Gen 5), production status (Active), and multiplier lock (both locked). The foundry for both is Intel.

FAQ

Q: Which processor has a higher boost clock?

A: The Intel Core 7 251E has a boost clock of 5.60 GHz, while the Intel Core Ultra X9 388H has a boost clock of 5.10 GHz.

Q: Does the Intel Core Ultra X9 388H support ECC memory?

A: No. The Core Ultra X9 388H does not support ECC memory. The Intel Core 7 251E does support ECC memory.

Q: What is the memory bandwidth difference?

A: The Intel Core Ultra X9 388H has a memory bandwidth of 153.6 GB/s, while the Intel Core 7 251E has 89.6 GB/s. The Core Ultra X9 388H has 71% more bandwidth.

Q: Which processor has more cores and threads?

A: The Intel Core 7 251E has 24 cores and 32 threads. The Intel Core Ultra X9 388H has 16 cores and 16 threads.

Q: What is the process node for each processor?

A: The Intel Core 7 251E is built on a 10 nm process node. The Intel Core Ultra X9 388H is built on a 3 nm process node.

Q: Which processor has recorded benchmark scores?

A: Only the Intel Core Ultra X9 388H has recorded benchmark scores in the database. Its average benchmark score is 44,466, and it sits at the 88th percentile. The Intel Core 7 251E has no benchmark scores recorded.

Where Each One Wins

The Intel Core Ultra X9 388H wins in every measured benchmark category because it is the only processor with recorded scores. Its Cinebench R23 multicore score of 18,911 and single-core score of 2,200.5 demonstrate strong performance in both parallel and single-threaded workloads. Its PassMark multithread score of 36,811 and single-thread score of 4,280 confirm balanced capabilities. Its 153.6 GB/s memory bandwidth and 3 nm process node give it an efficiency and memory-throughput advantage. Its nearest rivals are within 0.5%, placing it in a competitive tier with the AMD Ryzen 5 7500X3D, Intel Core i9-13950HX, AMD Ryzen AI Max 385, and Intel Core i5-13600.

The Intel Core 7 251E wins in specification-based categories where benchmark data is not required. It has 24 cores versus 16, 32 threads versus 16, a higher boost clock of 5.60 GHz versus 5.10 GHz, and double the L3 cache at 36 MB versus 18 MB. It supports ECC memory, provides 16 CPU-only PCIe Gen 5 lanes versus 4, and uses a desktop socket with a 257 mm² die. It also has a recorded launch MSRP of $384. These are architectural and platform advantages, but they are not validated by any benchmark scores.

For mobile workloads, the Core Ultra X9 388H is the only choice with data. For desktop expansion and memory integrity, the Core 7 251E offers a wider PCIe interface and ECC support. The Core Ultra X9 388H is the verified performer; the Core 7 251E is the unmeasured specification sheet.