Intel Core Ultra 9 285T vs Intel Core Ultra X9 378H Comparison

The Intel Core Ultra 9 285T and Intel Core Ultra X9 378H represent two distinct design philosophies from Intel, one aimed at desktop efficiency and the other at mobile performance. The benchmark data reveals a clear split in workload dominance, with the desktop part taking the majority of the tests while the mobile chip shows specific strengths in certain instruction-heavy tasks.

Head-to-Head Benchmarks

The most decisive wins for the Intel Core Ultra 9 285T come in raw computational throughput. In the PassMark integer math test, the 285T scores 132,433 against the 378H’s 92,603, a 43% advantage. This is the largest margin in any head-to-head comparison and highlights the desktop chip’s superior sustained multi-core output. Floating point math also heavily favors the 285T, with a score of 137,923 versus 114,500, a 20.5% gap. These two results alone indicate that the 285T is the stronger choice for general number-crunching workloads that rely on ALU and FPU performance.

The Cinebench suite provides a consistent but narrower picture. Across all six Cinebench tests (R15, R20, and R23, both multicore and singlecore), the 285T wins by margins between 3.1% and 3.2%. For example, Cinebench R23 multicore shows 33,573 for the 285T against 32,553 for the 378H, while the singlecore test shows 4,739 versus 4,595. The consistency of these margins suggests that the 285T’s architectural advantage is uniform across rendering workloads, rather than being workload-specific.

The 285T also takes the PassMark multithread test with a score of 39,931 versus 38,298, a 4.3% lead. Data encryption shows a larger 7.4% advantage for the 285T (32,061 vs 29,840), and random string sorting goes to the 285T by 6.8% (47,695 vs 44,648). Single-thread performance also favors the 285T at 4,576 versus 4,453, a 2.8% margin.

The Intel Core Ultra X9 378H, despite losing 13 of the 17 head-to-head tests, secures four wins, and they are notable. The largest is in PassMark extended instructions, where the 378H scores 31,315 against the 285T’s 27,477, a 12.3% victory. This indicates that the 378H’s instruction set implementation is more efficient for SIMD or specialized instruction workloads. The physics test is another clear win for the 378H, at 3,404 versus 2,842 for the 285T, a 16.5% margin. This suggests a stronger performance in physics simulation tasks, likely due to different scheduling or core architecture.

The 378H also wins the data compression test, scoring 386,591 versus 384,140, a narrow 0.6% margin. Finally, the prime number finding test goes to the 378H at 357 versus 345, a 3.4% lead. These wins, while fewer, show that the mobile chip can outperform the desktop part in specific application domains.

Where Each One Wins

The data indicates that the Intel Core Ultra 9 285T is the dominant processor for multi-threaded productivity and content creation. Its 43% lead in integer math and 20.5% lead in floating point math make it the clear choice for video encoding, 3D rendering, scientific computation, and software compilation. The consistent 3.1% to 3.2% margins in Cinebench R15, R20, and R23 across both single and multi-core tests reinforce this position for rendering workloads. The 7.4% lead in encryption also makes it better suited for disk encryption and secure communication tasks.

The 285T’s wins in multithread (4.3%), random string sorting (6.8%), and single-thread (2.8%) further establish it as the all-around performer for desktop users. Its 24 cores and 24 threads provide substantial parallelism, and the benchmark results confirm that this translates into real-world performance advantages across most tested categories. The 285T’s average benchmark score of 51,310 places it in the 91st percentile of all CPUs, showing it sits near the top of the performance spectrum.

The Intel Core Ultra X9 378H, by contrast, specializes in specific tasks. The 12.3% win in extended instructions is its most significant advantage, making it the better choice for workloads that leverage advanced vector instructions, such as certain audio/video codecs or AI inference tasks. The 16.5% win in physics is also substantial, suggesting the 378H may be better suited for physics simulation in engineering or gaming applications. The narrow wins in data compression (0.6%) and prime number finding (3.4%) are less decisive but still show competitiveness in those niches.

The 378H’s average benchmark score of 47,468 places it in the 89th percentile, which is close to the 285T’s 91st percentile. This indicates that the mobile chip is not far behind in overall performance, despite having fewer cores and a lower TDP. The 378H’s wins in physics and extended instructions suggest that its architecture, based on Panther Lake, has been optimized for specific instruction paths that the older Arrow Lake design does not prioritize.

FAQ

Q: Which processor wins more head-to-head benchmarks?

A: The Intel Core Ultra 9 285T wins 13 of the 17 head-to-head tests, while the Intel Core Ultra X9 378H wins 4.

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

A: The largest gap is in PassMark integer math, where the 285T scores 132,433 compared to the 378H’s 92,603, a 43% difference.

Q: In which tests does the Intel Core Ultra X9 378H outperform the 285T?

A: The 378H wins in PassMark extended instructions (31,315 vs 27,477), physics (3,404 vs 2,842), data compression (386,591 vs 384,140), and find prime numbers (357 vs 345).

Q: How do the processors compare in Cinebench R23 multicore?

A: The 285T scores 33,573, while the 378H scores 32,553, giving the 285T a 3.1% lead.

Q: What are the average benchmark scores for each processor?

A: The 285T has an average benchmark score of 51,310, and the 378H has an average score of 47,468.

Q: Which processor has a higher single-thread PassMark score?

A: The 285T scores 4,576, while the 378H scores 4,453, a 2.8% advantage for the 285T.

Specification Differences

The two processors differ in several fundamental specifications. The Intel Core Ultra 9 285T has 24 cores and 24 threads, while the Intel Core Ultra X9 378H has 16 cores and 16 threads. The 285T has a base clock of 1.40 GHz and a boost clock of 5.40 GHz, whereas the 378H has a base clock of 2.00 GHz and a boost clock of 5.00 GHz. The 285T has a TDP of 35 watts, while the 378H has a TDP of 25 watts.

Memory support also differs: the 285T supports DDR5 memory with a dual-channel bus and a bandwidth of 102.4 GB/s, while the 378H supports LPDDR5X with a dual-channel bus and a bandwidth of 153.6 GB/s. The 285T supports ECC memory, but the 378H does not. PCIe lane counts differ significantly, with the 285T offering Gen 5 with 20 lanes (CPU only), while the 378H offers Gen 5 with only 4 lanes (CPU only).

Integrated graphics are also different. The 285T uses Arc Xe-LPG Graphics with 64 execution units, while the 378H uses Arc B390. The 285T is a desktop processor on Intel Socket 1851, while the 378H is a mobile processor on Intel BGA 2540.

The 285T has a launch MSRP of $549, while the 378H has no listed launch MSRP. The 285T has a part number of SRQD3, while the 378H’s part number is listed as unknown.

Architecture Differences

The architecture of the two processors reflects their different target platforms. The Intel Core Ultra 9 285T is based on Arrow Lake, with the codename Arrow Lake-S, and belongs to the Core Ultra Series 2 generation. It is manufactured on a 3 nm process at TSMC, with 17,800 million transistors on a die size of 243 mm². Its cache hierarchy includes 192 KB of L1 per core, 3 MB of L2 per core, and 36 MB of shared L3 cache.

The Intel Core Ultra X9 378H is based on Panther Lake, with the codename Panther Lake-H, and belongs to the Core Ultra Series 3 generation. It is also manufactured on a 3 nm process, but at Intel’s own foundry. The transistor count and die size are not recorded in the database. Its cache configuration includes the same 192 KB of L1 per core, but only 2.5 MB of L2 per core and 18 MB of shared L3 cache, half the L3 of the 285T.

The 285T has a larger L2 cache per core (3 MB vs 2.5 MB) and double the total L3 cache (36 MB vs 18 MB). This cache advantage likely contributes to its wins in memory-intensive tests like random string sorting and integer math. The 378H’s higher memory bandwidth (153.6 GB/s vs 102.4 GB/s) may help explain its win in data compression, where memory throughput is critical.

Both processors use 3 nm technology, but from different foundries. The 285T’s Arrow Lake is a desktop-focused design with a higher TDP of 35 watts, while the 378H’s Panther Lake is a mobile design with a lower TDP of 25 watts. The 378H compensates for fewer cores and less cache with a higher base clock (2.00 GHz vs 1.40 GHz) and a more efficient memory interface. The architecture differences, particularly in cache size and memory bandwidth, explain why the 378H wins in extended instructions and physics despite losing the majority of tests.