Intel Core 7 251E vs Intel Core Ultra X9 378H Comparison

The Verdict

The recorded data presents a clear split based on platform and workload. The Intel Core 7 251E is a desktop processor with 24 cores and 32 threads, built for Socket 1700 systems. The Intel Core Ultra X9 378H is a mobile processor with 16 cores and 16 threads on the BGA 2540 socket. The benchmark database shows the Core Ultra X9 378H holds a dominant position in performance percentiles, ranking at the 89th percentile among all CPUs, while the Core 7 251E sits at the 50th percentile. The Core Ultra X9 378H has an average benchmark score of 47,468, placing it within 0.1% of the AMD Ryzen 9 PRO 5945 and 0.3% ahead of the Intel Core i7-13700KF. The Core 7 251E has no recorded benchmark scores in the database, so its actual performance cannot be directly quantified from the available data. The data indicates the Core Ultra X9 378H is the performance leader, while the Core 7 251E offers a distinct desktop feature set with ECC memory support and a higher core count. The choice between them depends entirely on whether the target system is a desktop or a mobile platform.

Architecture Differences

The two processors come from different Intel generations and process nodes. The Core 7 251E uses the Bartlett Lake codename and is built on a 10 nm process node. The Core Ultra X9 378H uses the Panther Lake codename, specifically Panther Lake-H, and is built on a 3 nm process node. This process difference is significant: the 3 nm node is considerably more advanced than the 10 nm node, which likely contributes to the mobile chip's efficiency and performance density. The Core 7 251E has a die size of 257 mm², while the Core Ultra X9 378H has no recorded die size in the database. Both chips are manufactured by Intel, and both are listed as Active in production status.

The core configurations differ substantially. The Core 7 251E has 24 cores and 32 threads, indicating a hybrid architecture with more threads than cores, suggesting some cores lack hyper-threading. The Core Ultra X9 378H has 16 cores and 16 threads, meaning each core maps to exactly one thread. In terms of cache, 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 378H has 192 KB of L1 cache per core, 2.5 MB of L2 cache per core, and 18 MB of shared L3 cache. The Core 7 251E therefore has twice the total L3 cache capacity, while the Core Ultra X9 378H has larger per-core L1 and L2 allocations.

Clock speeds also differ. The Core 7 251E has a base clock of 2.10 GHz and a boost clock of 5.60 GHz. The Core Ultra X9 378H has a base clock of 2.00 GHz and a boost clock of 5.00 GHz. The desktop chip has a higher clock ceiling by 0.60 GHz, but the mobile chip is close in base frequency. The thermal design power differs dramatically: the Core 7 251E has a TDP of 65 watts, while the Core Ultra X9 378H has a TDP of 25 watts. This 40-watt gap reflects the mobile target of the Ultra X9 and the desktop target of the Core 7.

Head-to-Head Benchmarks

The head-to-head benchmark comparison in the database contains no entries for these two processors, so there are no direct side-by-side test results to analyze. However, the Core Ultra X9 378H has a full set of Cinebench and PassMark scores recorded, while the Core 7 251E has none. The available benchmarks for the Core Ultra X9 378H show strong multi-core and single-core results. In Cinebench R15, it scores 3,281 in multi-core and 462 in single-core. In Cinebench R20, the scores are 13,672 multi-core and 1,929 single-core. In Cinebench R23, the scores reach 32,553 multi-core and 4,595 single-core.

The PassMark results for the Core Ultra X9 378H show 92,603 in integer math, 114,500 in floating point math, 386,591 in data compression, 29,840 in data encryption, and 31,315 in extended instructions. It also records 38,298 in multithread, 4,453 in single-thread, 3,404 in physics, 357 in find prime numbers, and 44,648 in random string sorting. These scores place the chip at the 89th percentile overall. Its nearest rivals in the database are the AMD Ryzen 9 PRO 5945 with an average score of 47,527 and a delta of -0.1%, the Intel Core i7-13700KF with 47,330 and a delta of 0.3%, the Intel Core Ultra 7 265T with 47,697 and a delta of -0.5%, and the Intel Core i9-12900F with 47,176 and a delta of 0.6%. The Core Ultra X9 378H therefore sits in a tight cluster where the largest recorded performance gap to any listed rival is 0.6%, which is the difference against the Core i9-12900F.

Because the Core 7 251E has no benchmark scores, the database cannot confirm any performance advantage for that chip. The only measurable performance data belongs to the Core Ultra X9 378H, and that data is strong enough to rank it near the top of the database. The Core 7 251E's higher core count and boost clock suggest theoretical potential, but without recorded measurements, no quantitative comparison is possible.

Specification Differences

The two processors differ in several key specification fields. The Core 7 251E supports DDR4 and DDR5 memory, while the Core Ultra X9 378H supports only LPDDR5X. Both use a dual-channel memory bus. The memory bandwidth differs: the Core 7 251E has 89.6 GB/s, while the Core Ultra X9 378H has 153.6 GB/s. The mobile chip has a 64 GB/s higher memory bandwidth, which is a notable advantage for memory-intensive workloads. ECC memory support is present on the Core 7 251E and absent on the Core Ultra X9 378H. This makes the desktop chip suitable for error-correcting memory configurations, a feature often associated with workstation or server-adjacent use.

The PCIe configurations also differ. The Core 7 251E provides Gen 5 with 16 lanes, CPU only. The Core Ultra X9 378H provides Gen 5 with 4 lanes, CPU only. The desktop chip offers 12 more PCIe lanes, which is a significant advantage for expansion options like multiple GPUs or NVMe drives. The integrated graphics units differ as well: the Core 7 251E uses UHD Graphics 770, while the Core Ultra X9 378H uses Arc B390. The Core Ultra X9's Arc B390 is a newer graphics architecture, though no benchmark scores are available to quantify the difference in graphics performance.

The launch MSRP of the Core 7 251E is $384, stated once here as the launch MSRP. The Core Ultra X9 378H has no launch MSRP recorded in the database. The release dates differ: the Core 7 251E was released on 2025-01-12, while the Core Ultra X9 378H was released on 2026-04-03. The Core 7 251E has a part number of SRQDUQ657, while the Core Ultra X9 378H has an unknown part number. Neither processor has an unlocked multiplier, so both are locked for overclocking. The market segments differ, with the Core 7 251E classified as Desktop and the Core Ultra X9 378H classified as Mobile.

FAQ

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 378H has 16 cores and 16 threads.

Q: Which processor has a higher boost clock?

A: The Intel Core 7 251E has a boost clock of 5.60 GHz, which is 0.60 GHz higher than the Intel Core Ultra X9 378H's boost clock of 5.00 GHz.

Q: Which processor supports ECC memory?

A: The Intel Core 7 251E supports ECC memory. The Intel Core Ultra X9 378H does not support ECC memory.

Q: Which processor has higher memory bandwidth?

A: The Intel Core Ultra X9 378H has a memory bandwidth of 153.6 GB/s, while the Intel Core 7 251E has a memory bandwidth of 89.6 GB/s. The mobile chip has 64 GB/s more bandwidth.

Q: What is the performance percentile of each processor?

A: The Intel Core Ultra X9 378H is at the 89th percentile among all CPUs, while the Intel Core 7 251E is at the 50th percentile.

Q: Which processor has a smaller process node?

A: The Intel Core Ultra X9 378H is built on a 3 nm process node, while the Intel Core 7 251E is built on a 10 nm process node. The 3 nm node is smaller and more advanced.

Where Each One Wins

The Intel Core 7 251E wins in core count, thread count, boost clock, L3 cache capacity, PCIe lane count, ECC memory support, and desktop expansion capability. Its 24 cores and 32 threads provide a larger parallel workload capacity on paper, and its 36 MB of shared L3 cache doubles the 18 MB found on the Core Ultra X9 378H. The 16 PCIe Gen 5 lanes allow for more connected devices, and the DDR4 and DDR5 memory support gives it flexibility in memory choice. The 65-watt TDP and desktop socket make it suitable for full-size systems where power draw is less constrained. The data shows it also has a recorded launch MSRP of $384, which is the only pricing information available for either chip.

The Intel Core Ultra X9 378H wins in process node, memory bandwidth, integrated graphics, and every recorded benchmark. Its 3 nm node is a full generation ahead of the 10 nm node used by the Core 7 251E. The 153.6 GB/s memory bandwidth is 64 GB/s higher, which benefits memory-heavy tasks. The Arc B390 integrated graphics is newer than the UHD Graphics 770. The benchmark scores place it at the 89th percentile, and its average score of 47,468 puts it within 0.6% of four established desktop rivals, including the Intel Core i9-12900F and Intel Core i7-13700KF. The 25-watt TDP also indicates high efficiency for a mobile platform.

The use-case split is clear from the data: the Core Ultra X9 378H is the choice for mobile systems where performance per watt matters, and its recorded benchmarks confirm strong compute capability. The Core 7 251E is the choice for desktop builds that need ECC memory, more PCIe lanes, and a higher core count, though its lack of recorded benchmarks means its actual performance remains unverified in the database. The two chips target different sockets and different market segments, so the platform requirement will often dictate the selection before performance is even considered.