Intel Core 3 305 vs Intel Core Ultra X9 388H Comparison

Head-to-Head Benchmarks

The benchmark database shows a decisive sweep in favor of the Intel Core Ultra X9 388H across all 17 recorded comparisons. The Intel Core 3 305 does not record a single win in any test. The margins are substantial, ranging from a relatively narrow single-thread gap to massive multi-thread and math-oriented deficits.

Starting with multi-threaded workloads, the Core Ultra X9 388H leads by 55.3% in Cinebench R15 multicore (2955 versus 1322). The gap widens further in Cinebench R20 multicore, where the Ultra X9 scores 13101 against 5511, a 57.9% advantage. In Cinebench R23 multicore, the Ultra X9 posts 18911 compared to 13123, reducing the deficit to 30.6%, yet still a clear win. The PassMark multithread test shows 36811 for the Ultra X9 versus 15439 for the Core 3 305, a 58.1% difference.

The single-thread comparisons are closer but still favor the Ultra X9. In Cinebench R15 single-core, the Ultra X9 records 309.5 against 186, a 39.9% lead. Cinebench R20 single-core shows 1849 versus 777, a 58% gap. Cinebench R23 single-core narrows the margin to 15.8% (2200.5 versus 1852). PassMark single-thread shows 4280 versus 3977, only a 7.1% difference, the smallest of all head-to-head tests.

Math-intensive workloads show the largest performance deltas. PassMark integer math favors the Ultra X9 by 64.5% (90882 versus 32295). Floating-point math shows a 62.4% advantage (112550 versus 42284). The find prime numbers test records the biggest proportional gap at 67.9% (358 versus 115). Data compression and encryption also demonstrate clear separation: compression at 59.4% (361763 versus 146857) and encryption at 61.3% (28490 versus 11019). Extended instructions, physics, and random string sorting all follow the same pattern, with leads between 54.8% and 61.8%.

The average benchmark score for the Core Ultra X9 388H is 44466, placing it in the 88th percentile of all CPUs in the database. The Core 3 305 averages 18302, which sits in the 72nd percentile. The nearest rivals for the Core 3 305 include the Intel Core i3-14100 (avg 18318, delta -0.1%), the Intel Core 5 330 (avg 18345, delta -0.2%), the Intel Core 7 360 (avg 18374, delta -0.4%), and the AMD Ryzen 5 2600E (avg 18230, delta 0.4%). The Core Ultra X9 388H is bracketed by the AMD Ryzen 5 7500X3D (avg 44573, delta -0.2%), the Intel Core i9-13950HX (avg 44342, delta 0.3%), the AMD Ryzen AI Max 385 (avg 44309, delta 0.4%), and the Intel Core i5-13600 (avg 44240, delta 0.5%). These rival clusters confirm that the Core 3 305 operates in a lower performance tier, while the Ultra X9 competes with high-end desktop and mobile processors.

The Verdict

The data presents an unambiguous hierarchy. The Intel Core Ultra X9 388H outperforms the Intel Core 3 305 in every measured workload, from light single-thread tasks to heavily parallel math and compression tests. The performance gap is not uniform, however, and the shape of the differences matters for interpretation. The smallest margin (7.1%) occurs in single-thread performance, indicating that the Core 3 305 is not far behind in lightly threaded scenarios. The largest margins (over 60%) appear in integer math, floating-point math, encryption, and data compression, all of which scale with core count and memory bandwidth.

The Core Ultra X9 388H uses 16 cores and 16 threads, a base clock of 2.10 GHz, a boost clock of 5.10 GHz, and dual-channel LPDDR5X memory with 153.6 GB/s bandwidth. The Core 3 305 uses 6 cores and 6 threads, a base clock of 1.50 GHz, a boost clock of 4.30 GHz, and single-channel memory with 59.7 GB/s bandwidth. The thread count difference (16 versus 6) and the memory bandwidth difference (153.6 GB/s versus 59.7 GB/s) explain the wide multi-thread and math margins. The boost clock difference (5.10 GHz versus 4.30 GHz) contributes to the single-thread advantage.

For users selecting a mobile processor strictly from these benchmarks, the Core Ultra X9 388H is the clear choice for any workload that uses more than a couple of threads. The Core 3 305 remains competitive only in single-thread applications, where the 7.1% gap would be difficult to perceive in most real-world usage. The Core 3 305 also carries a launch MSRP of $309, while the Core Ultra X9 388H has no recorded launch MSRP in the database.

Where Each One Wins

The Intel Core Ultra X9 388H wins every recorded benchmark, but the magnitude varies by workload type. The largest victories occur in tasks that are heavily parallel or memory-bound. Data encryption shows a 61.3% lead, data compression 59.4%, integer math 64.5%, and floating-point math 62.4%. These workloads benefit directly from the 16-core configuration and the 153.6 GB/s dual-channel memory. The physics test also shows a 61.8% lead, and the find prime numbers test shows 67.9%, both consistent with multi-core scaling.

The Core Ultra X9 388H also wins the Cinebench suite across all versions, with the R20 multi-core test showing a 57.9% margin and R15 multi-core showing 55.3%. The R23 multi-core margin is smaller at 30.6%, suggesting that the workload scales differently or that the Core 3 305 is better optimized for that specific renderer. The single-core Cinebench results favor the Ultra X9 with margins between 15.8% and 58%, depending on the version. The R20 single-core test is the outlier at 58%, while R23 single-core is only 15.8%, indicating that the Core 3 305 performs relatively better in the newer Cinebench version.

The Intel Core 3 305 does not record a win in any category, so its "where it wins" section is defined by the narrowness of defeats. In PassMark single-thread, the Core 3 305 trails by only 7.1%, which is the closest result in the entire comparison. In Cinebench R23 single-core, the deficit is 15.8%, still moderate. These two tests represent the best-case scenarios for the Core 3 305, suggesting it can handle basic single-threaded productivity and light rendering tasks without a major penalty. For any workload that scales with cores or memory bandwidth, the Core 3 305 falls behind by half or more.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core Ultra X9 388H has an average benchmark score of 44466, while the Intel Core 3 305 averages 18302. The Ultra X9 also holds the 88th percentile among all CPUs, compared to the 72nd percentile for the Core 3 305.

Q: What is the single-thread performance difference?

A: In PassMark single-thread, the Core Ultra X9 388H scores 4280 versus 3977 for the Core 3 305, a 7.1% lead. In Cinebench R23 single-core, the Ultra X9 scores 2200.5 versus 1852, a 15.8% lead.

Q: How do the core counts and thread counts compare?

A: The Core Ultra X9 388H has 16 cores and 16 threads. The Core 3 305 has 6 cores and 6 threads. Neither processor supports multi-threading per core, so thread counts equal core counts.

Q: Which processor has more cache?

A: The Core Ultra X9 388H has 18 MB of shared L3 cache, 3 MB of L2 cache per core, and 192 KB of L1 cache per core. The Core 3 305 has 6 MB of shared L3 cache, 2.5 MB of L2 cache, and 192 KB of L1 cache.

Q: What are the memory bandwidth specifications?

A: The Core Ultra X9 388H uses dual-channel LPDDR5X with 153.6 GB/s bandwidth. The Core 3 305 uses single-channel DDR5 and LPDDR5X with 59.7 GB/s bandwidth.

Q: Which processor has a higher boost clock?

A: The Core Ultra X9 388H boosts to 5.10 GHz, while the Core 3 305 boosts to 4.30 GHz. The base clocks are 2.10 GHz and 1.50 GHz, respectively.

Architecture Differences

The two processors come from different Intel families and use different sockets. The Core 3 305 is part of the Core 3 generation with the codename Wildcat Lake, while the Core Ultra X9 388H belongs to the Core Ultra Series 3 and uses the Panther Lake architecture, specifically the Panther Lake-H variant. Both are manufactured on a 3 nm process at Intel, but they target different performance levels within the mobile segment.

The Core 3 305 uses the Intel BGA 1516 socket, while the Core Ultra X9 388H uses the Intel BGA 2540 socket. The Core 3 305 has 6 cores and 6 threads, with a base clock of 1.50 GHz and a boost clock of 4.30 GHz. The Core Ultra X9 388H has 16 cores and 16 threads, with a base clock of 2.10 GHz and a boost clock of 5.10 GHz. The thermal design power differs as well: the Core 3 305 is rated at 15 W, while the Core Ultra X9 388H is rated at 25 W.

Cache organization shows a significant architectural split. The Core 3 305 has 192 KB of L1 cache, 2.5 MB of L2 cache, and 6 MB of shared L3 cache. The Core Ultra X9 388H has 192 KB of L1 cache per core, 3 MB of L2 cache per core, and 18 MB of shared L3 cache. The per-core L2 allocation suggests a more distributed cache design in the Ultra X9, which aligns with its higher core count.

Memory support also differs. The Core 3 305 supports both DDR5 and LPDDR5X, but only through a single-channel memory bus, yielding 59.7 GB/s bandwidth. The Core Ultra X9 388H supports only LPDDR5X, but uses a dual-channel bus, more than doubling the bandwidth to 153.6 GB/s. Neither processor supports ECC memory.

PCIe connectivity distinguishes the two as well. The Core 3 305 provides PCIe Gen 4 with 6 lanes (CPU only). The Core Ultra X9 388H provides PCIe Gen 5 with 4 lanes (CPU only). The Core 3 305 has a higher lane count but an older generation, while the Ultra X9 offers the newer standard with fewer lanes.

Integrated graphics differ substantially. The Core 3 305 includes Intel Xe3 Graphics with 1 Xe core. The Core Ultra X9 388H includes Arc B390 graphics, which represents a different product tier. The release dates also differ: the Core 3 305 launched on April 15, 2026, while the Core Ultra X9 388H launched earlier on January 4, 2026. The Core 3 305 has a recorded part number of SAE3L and a launch MSRP of $309; the Core Ultra X9 388H has part number SA4QWQ9EK and no recorded launch MSRP. Neither processor has an unlocked multiplier.