Intel Core Ultra 7 265T vs Intel Core Ultra X9 378H Comparison

The benchmark data presents a clear, if surprising, hierarchy between these two Intel processors. The mobile-oriented Intel Core Ultra X9 378H is the decisive winner in the vast majority of head-to-head tests, taking 15 of 17 comparisons against the desktop Intel Core Ultra 7 265T. However, the 265T secures two significant victories in math-heavy workloads, revealing a distinct performance profile that matters for specific use cases. The overall average benchmark score is nearly identical, with the 265T at 47697 and the 378H at 47468, a difference of just 0.5%, but this masks a stark division in workload strengths.

Head-to-Head Benchmarks

The Intel Core Ultra X9 378H dominates in processor-wide and single-threaded tests, consistently outperforming the 265T by a narrow but uniform margin. In Cinebench R23 multi-core, the 378H scores 32553 against the 265T’s 31558, a 3.1% advantage. The single-core results follow the same pattern, with the 378H scoring 4595 in Cinebench R23 single-core versus 4455 for the 265T, a 3% lead. These margins are consistent across all Cinebench versions, with the 378H winning R15 multi-core (3281 vs 3180), R15 single-core (462 vs 449), R20 multi-core (13672 vs 13254), and R20 single-core (1929 vs 1871) by roughly 3% in each case.

The most dramatic win for the 378H comes in the Passmark physics test. Here, the 378H scores 3404, a massive 29.8% ahead of the 265T’s 2391. This is the largest performance gap in the entire comparison and indicates a substantial advantage in simulations or physics calculations. The 378H also shows strong results in data compression, scoring 386591 versus 370158, a 4.3% lead, and in extended instructions, where it scores 31315 against 28609, an 8.6% advantage. Smaller but consistent wins appear in Passmark multithread (38298 vs 37084, a 3.2% lead), prime number finding (357 vs 322, a 9.8% lead), and random string sorting (44648 vs 44400, a 0.6% lead). Even in data encryption, where the margin is tightest, the 378H edges ahead with 29840 versus 29687, a 0.5% gain.

The Intel Core Ultra 7 265T fights back where raw math throughput matters. In Passmark floating point math, the 265T scores 129817, a commanding 13.4% ahead of the 378H’s 114500. It repeats this feat in integer math, scoring 104943 versus 92603, a 13.3% lead. These are not minor margins; they represent a significant advantage in number-crunching tasks that rely on sustained arithmetic operations. The 265T also holds a slight edge in the overall average benchmark score, 47697 versus 47468, though this is largely due to its strong showing in these two heavyweight tests.

Architecture Differences

The two processors are built on fundamentally different platforms despite sharing the same 3 nm process node. The Intel Core Ultra 7 265T is a desktop part using the Arrow Lake architecture on an Intel Socket 1851, while the Intel Core Ultra X9 378H is a mobile processor based on the Panther Lake architecture on an Intel BGA 2540 socket. The foundries also differ, with the 265T fabricated by TSMC and the 378H by Intel.

Core configuration is a key differentiator. The 265T features 20 cores and 20 threads, while the 378H has 16 cores and 16 threads. Despite having fewer cores, the 378H achieves higher performance in most tests, suggesting more efficient core design or higher clock speeds. The 265T has a base clock of 1.50 GHz and a boost clock of 5.30 GHz, while the 378H has a higher base clock of 2.00 GHz but a lower boost clock of 5.00 GHz. Cache layouts also differ, with the 265T offering 3 MB of L2 cache per core and 30 MB of shared L3 cache, while the 378H provides 2.5 MB of L2 per core and only 18 MB of L3 cache.

Memory support is another major split. The 265T uses DDR5 memory with dual-channel support and a bandwidth of 102.4 GB/s, while the 378H uses LPDDR5X with dual-channel support and a higher bandwidth of 153.6 GB/s. This memory bandwidth advantage likely contributes to the 378H’s strong performance in compression and physics tests. PCIe connectivity also differs, with the 265T offering Gen 5 with 20 lanes (CPU only) versus the 378H’s Gen 5 with 4 lanes, reflecting the desktop versus mobile design philosophy. The integrated graphics are distinct as well, with the 265T featuring Arc Xe-LPG Graphics with 64EU and the 378H featuring Arc B390. The 265T has a launch MSRP of $384, while the 378H has no listed launch MSRP.

FAQ

Q: Which processor has a higher core count?

A: The Intel Core Ultra 7 265T has 20 cores and 20 threads, while the Intel Core Ultra X9 378H has 16 cores and 16 threads.

Q: Why does the 378H win most benchmarks despite having fewer cores?

A: The 378H has a higher base clock of 2.00 GHz versus 1.50 GHz, a larger memory bandwidth of 153.6 GB/s versus 102.4 GB/s, and a different architecture (Panther Lake) that appears more efficient in single-threaded and multi-threaded workloads, as shown by its 3% lead in Cinebench R23 multi-core.

Q: In which areas does the 265T outperform the 378H?

A: The 265T wins in Passmark floating point math (129817 vs 114500, a 13.4% lead) and integer math (104943 vs 92603, a 13.3% lead), making it stronger for raw arithmetic computation.

Q: What is the biggest performance gap between the two processors?

A: The largest gap is in Passmark physics, where the 378H scores 3404, a 29.8% advantage over the 265T’s 2391.

Q: Do these processors use the same memory type?

A: No, the 265T supports DDR5 memory, while the 378H supports LPDDR5X memory. The 378H has significantly higher memory bandwidth at 153.6 GB/s compared to 102.4 GB/s.

Q: What is the difference in socket types?

A: The 265T uses Intel Socket 1851 for desktop builds, while the 378H uses Intel BGA 2540, which is a mobile socket.

The Verdict

The data points to a clear conclusion: the Intel Core Ultra X9 378H is the superior processor for general and most specialized workloads. It wins 15 of 17 head-to-head benchmarks, including all Cinebench tests, all Passmark multithread tests, and the physics test by a landslide. The 378H’s 3% lead in Cinebench R23 multi-core and single-core, combined with its 29.8% advantage in physics, makes it the better choice for rendering, simulation, and everyday productivity tasks. Its higher memory bandwidth of 153.6 GB/s likely drives these wins, enabling faster data movement.

The Intel Core Ultra 7 265T is not without merit, but its strengths are narrowly focused. It wins decisively in floating point math and integer math, with 13.4% and 13.3% leads respectively. This makes it a specialized tool for scientific computing, financial modeling, or any workload that hammer on arithmetic operations. However, for everything else, the 378H is ahead. The 265T’s higher core count of 20 versus 16 does not translate into a multi-threaded win, as the 378H outperforms it in Passmark multithread by 3.2%. The 265T also operates at a higher TDP of 35 watts versus 25 watts, which may factor into system design but does not yield a performance advantage in the data.

For a buyer deciding between these two, the choice is straightforward. If the workload is dominated by math-heavy computation, the 265T’s floating point and integer wins are compelling. For any other use case, including gaming, content creation, or general multitasking, the 378H’s consistent wins across every Cinebench test and most Passmark tests make it the stronger pick.

Specification Differences

The two processors diverge on nearly every major specification. The 265T has 20 cores and 20 threads, while the 378H has 16 cores and 16 threads. Base clocks differ, with the 265T at 1.50 GHz and the 378H at 2.00 GHz. Boost clocks also differ, with the 265T at 5.30 GHz and the 378H at 5.00 GHz. The TDP is lower for the 378H at 25 watts, compared to 35 watts for the 265T. The 265T uses a desktop socket (Intel Socket 1851), while the 378H uses a mobile socket (Intel BGA 2540). Architectures differ, with the 265T using Arrow Lake and the 378H using Panther Lake. The foundry is different, with TSMC producing the 265T and Intel producing the 378H. L2 cache is 3 MB per core on the 265T versus 2.5 MB per core on the 378H. L3 cache is 30 MB shared on the 265T versus 18 MB shared on the 378H. Memory support is DDR5 for the 265T and LPDDR5X for the 378H. Memory bandwidth is 102.4 GB/s for the 265T and 153.6 GB/s for the 378H. PCIe lanes are 20 on the 265T versus 4 on the 378H. The integrated graphics are Arc Xe-LPG Graphics 64EU on the 265T and Arc B390 on the 378H.

Where Each One Wins

The Intel Core Ultra X9 378H is the winner for any workload that benefits from consistent multi-core and single-core performance. It wins all six Cinebench tests, covering both single and multi-core rendering scenarios. It also wins Passmark multithread, data compression, data encryption, extended instructions, prime number finding, physics, and random string sorting. This makes it the better choice for video editing, 3D rendering, data compression, and any application that uses physics simulations. The 378H’s 29.8% lead in physics is particularly notable for engineering or scientific software that relies on rigid body dynamics.

The Intel Core Ultra 7 265T wins in exactly two areas: floating point math and integer math. These are core arithmetic operations used in financial analysis, scientific computing, and certain types of data processing. The 13.4% lead in floating point and 13.3% lead in integer math are significant enough to justify choosing the 265T for dedicated math workstations. However, its overall average benchmark score of 47697 is only 0.5% higher than the 378H’s 47468, meaning this advantage is isolated. For users who do not spend most of their time in math-heavy applications, the 378H’s broader wins make it the more versatile processor.