Intel Core 5 315 vs Intel Core Ultra X9 378H Comparison

The Intel Core 5 315 and the Intel Core Ultra X9 378H are both 3 nm mobile processors, but they occupy distinctly different tiers within Intel's lineup. The recorded data shows a decisive performance gap, with the Ultra X9 378H winning all 17 head-to-head benchmark comparisons. However, the two chips are engineered for different purposes, and the Core 5 315's lower power envelope and smaller footprint position it as a highly efficient solution, while the Ultra X9 378H is a high-end part for demanding workloads. The Core 5 315 holds a 72nd percentile rank among all CPUs, while the Ultra X9 378H sits much higher at the 89th percentile, underscoring the performance hierarchy between them.

Where Each One Wins

The Intel Core Ultra X9 378H dominates every measured workload in the database. In the Cinebench series, the Ultra X9 378H shows a roughly 60.1% advantage in multi-core tests and a similar 60.1% to 60.2% lead in single-core tests. Its performance is not merely a matter of more cores; the single-core results prove that its microarchitecture and higher boost clocks deliver superior per-thread performance as well. The Passmark suite confirms this across the board: integer math, floating point math, data encryption, data compression, and extended instruction workloads all see the Ultra X9 378H take a commanding lead, with deltas ranging from 58% to 68.6%.

The Intel Core 5 315 does not win any of the 17 head-to-head comparisons. Its strengths lie entirely outside raw benchmark scores. The data records a TDP of 15 watts for the Core 5 315 versus 25 watts for the Ultra X9 378H. This suggests the Core 5 315 is the more thermally conservative option, suited for compact, passively or lightly cooled designs where energy draw is the primary constraint. Additionally, the Core 5 315 uses Intel BGA 1516, while the Ultra X9 378H uses Intel BGA 2540, meaning the two chips are not socket-interchangeable. The Core 5 315 also supports both DDR5 and LPDDR5X memory, whereas the Ultra X9 378H only supports LPDDR5X, which could make the Core 5 315 more flexible for certain system designs.

Architecture Differences

The architectural gulf between the two parts is substantial. The Core 5 315 is a 6-core, 6-thread processor based on the Wildcat Lake codename, while the Ultra X9 378H is a 16-core, 16-thread processor from the Panther Lake family. Both use a 3 nm process node from Intel, but the Ultra X9 378H features a dual-channel memory bus with 153.6 GB/s of bandwidth, while the Core 5 315 is limited to a single-channel bus delivering 59.7 GB/s. This memory bandwidth difference alone can heavily influence memory-sensitive workloads such as data compression and encryption, where the Ultra X9 378H leads by 62.2% and 62.7% respectively.

Cache configurations also diverge sharply. The Core 5 315 has 192 KB of L1 cache, 2.5 MB of L2 cache, and 6 MB of shared L3 cache. The Ultra X9 378H lists 192 KB of L1 cache per core and 2.5 MB of L2 cache per core, with a much larger 18 MB of shared L3 cache. The per-core L2 specification on the Ultra X9 378H scales with its 16 cores, providing a total L2 pool that is vastly larger than that of the Core 5 315. The integrated graphics also differ: the Core 5 315 uses Intel Xe3 Graphics with 2 Xe cores, while the Ultra X9 378H uses the more capable Arc B390. The Ultra X9 378H also supports PCIe Gen 5 with 4 CPU lanes, whereas the Core 5 315 uses PCIe Gen 4 with 6 CPU lanes, a trade-off between newer signaling and lane count.

Head-to-Head Benchmarks

The benchmark data shows a consistent and overwhelming lead for the Ultra X9 378H. Starting with Cinebench R15, the Ultra X9 378H scores 3281 in multi-core versus 1308 for the Core 5 315, a 60.1% gap. In single-core R15, the scores are 462 versus 184, a 60.2% difference. Moving to Cinebench R20, the multi-core scores are 13672 versus 5452 (60.1% lead), and single-core scores are 1929 versus 769 (60.1% lead). Cinebench R23 follows the same pattern: 32553 versus 12981 in multi-core (60.1% lead) and 4595 versus 1832 in single-core (60.1% lead). These consistent deltas indicate that the Ultra X9 378H's advantage is not workload-specific; it stems from a fundamental performance advantage in both parallel and sequential execution.

The Passmark suite reinforces the trend. The Ultra X9 378H scores 386591 in data compression versus 146143, a 62.2% lead. Data encryption shows 29840 versus 11119, a 62.7% lead. Extended instructions result in 31315 versus 13143, a 58% lead. The largest gap appears in find prime numbers, where the Ultra X9 378H scores 357 versus 112, a 68.6% lead. Floating point math shows 114500 versus 42441 (62.9% lead), and integer math shows 92603 versus 31690 (65.8% lead). The multithread test shows 38298 versus 15272 (60.1% lead), and physics shows 3404 versus 1163 (65.8% lead). Random string sorting results in 44648 versus 17551, a 60.7% lead.

The smallest relative gap is in single-threaded performance. The Passmark single-thread test shows 4453 for the Ultra X9 378H versus 4021 for the Core 5 315, a 9.7% lead. This smaller delta indicates that while the Ultra X9 378H has a strong per-core advantage, it is not as overwhelming as its multi-threaded dominance. Still, even in this closest comparison, the Ultra X9 378H remains ahead, leaving the Core 5 315 without a single victory in the recorded benchmarks.

The Verdict

The data directs a straightforward choice. The Intel Core Ultra X9 378H is the superior processor for any workload that benefits from raw compute performance. Its 89th percentile ranking, compared to the Core 5 315's 72nd percentile, places it in a different performance class entirely. The Ultra X9 378H's nearest rivals include the AMD Ryzen 9 PRO 5945 with an average score of 47527 (0.1% higher), the Intel Core Ultra 7 265T with 47697 (0.5% higher), and the Intel Core i7-13700KF with 47330 (0.3% lower). The Core 5 315, by contrast, sits near the Intel Core i7-9700 (18180 average score, 0% delta) and the AMD Ryzen 7 5700U (18176 average score, 0.1% delta), showing it competes with older or lower-power parts.

For a system designer prioritizing energy efficiency, the Core 5 315's 15 watt TDP versus the Ultra X9 378H's 25 watt TDP is the defining specification. The Core 5 315 can be implemented in thinner, fanless, or longer-battery-life designs where the Ultra X9 378H's power draw would be prohibitive. The single-channel memory bus and 6 MB L3 cache are acceptable for light productivity and media consumption, and the PCIe Gen 4 connectivity is sufficient for standard peripherals. The Ultra X9 378H, however, is the clear choice for a mobile workstation or high-performance laptop where rendering, compilation, data analysis, or large-scale number crunching are primary tasks. Its 18 MB L3 cache, dual-channel 153.6 GB/s memory bandwidth, and Arc B390 graphics make it a far more complete high-end package.

The launch MSRP of the Core 5 315 is $340, which positions it as a mid-range part. The Ultra X9 378H has no recorded launch MSRP, but its performance tier and nearest rivals (which include desktop-class chips like the Intel Core i9-12900F with an average score of 47176) indicate it is a premium offering. Users who need maximum throughput should select the Ultra X9 378H without reservation. Users who value minimal power draw and a smaller physical footprint above all else will find the Core 5 315 adequate, but they must accept a 60% or greater deficit in nearly every multithreaded benchmark and a 9.7% deficit even in single-threaded work.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core Ultra X9 378H has 16 cores and 16 threads, while the Intel Core 5 315 has 6 cores and 6 threads.

Q: How large is the performance gap in single-threaded workloads?

A: The smallest gap is in the Passmark single-thread test, where the Ultra X9 378H scores 4453 versus 4021, a 9.7% lead. In Cinebench R23 single-core, the gap is larger: 4595 versus 1832, a 60.1% lead.

Q: What is the difference in memory bandwidth?

A: The Core 5 315 uses a single-channel memory bus with 59.7 GB/s bandwidth, while the Ultra X9 378H uses a dual-channel bus with 153.6 GB/s bandwidth.

Q: Do both processors use the same socket?

A: No. The Core 5 315 uses Intel BGA 1516, and the Ultra X9 378H uses Intel BGA 2540.

Q: Which processor supports PCIe Gen 5?

A: Only the Ultra X9 378H supports PCIe Gen 5, with 4 CPU lanes. The Core 5 315 uses PCIe Gen 4 with 6 CPU lanes.

Q: What are the average benchmark scores for each?

A: The Core 5 315 has an average benchmark score of 18188, while the Ultra X9 378H has an average benchmark score of 47468. The Ultra X9 378H's nearest rival, the AMD Ryzen 9 PRO 5945, scores 47527 with a 0.1% delta.