Intel Core Ultra 5 338H vs Intel Processor U303L Comparison

Head-to-Head Benchmarks

The Intel Core Ultra 5 338H delivers a decisive performance advantage across every measurable workload in the database. The Intel Processor U303L has no recorded benchmark scores, so the comparison is one-sided in terms of raw measured output. The Ultra 5 338H produces a Cinebench R23 multi-core score of 16331 and a single-core score of 2044, while the U303L shows no recorded Cinebench results. In PassMark testing, the Ultra 5 338H records a multithread score of 28717 and a single-thread score of 4180. The U303L has no PassMark entries available, meaning the database contains no direct numeric comparison for that processor.

The Ultra 5 338H also holds a substantial advantage in average benchmark score. Its average is 33989, placing it in the 84th percentile of all CPUs. The U303L has an average benchmark score of 0 and sits in the 50th percentile, which reflects the absence of recorded measurements rather than a literal performance of zero. The nearest rivals for the Ultra 5 338H illustrate its competitive position: the Intel Core Ultra 7 165H averages 34083, which is 0.3% higher, while the Intel Core i7-12800HX averages 33875, 0.3% lower. The AMD EPYC 4244P averages 34220, 0.7% higher, and the Intel Xeon 6353P averages 33844, 0.4% lower. These deltas are all under one percent, indicating the Ultra 5 338H sits in a tightly packed performance band with those established processors.

Where Each One Wins

The Ultra 5 338H wins in every category where data exists. Multi-threaded workloads show the largest margins. The Cinebench R23 multi-core result of 16331 demonstrates strong scaling across its 12 threads, and the Cinebench R20 multi-core score of 10213 reinforces that pattern. The Cinebench R15 multi-core score of 2504 further confirms consistent multi-thread capability. Single-thread performance is also strong, with Cinebench R23 single-core at 2044, Cinebench R20 single-core at 1441, and Cinebench R15 single-core at 305. PassMark results show balanced strengths across different operation types: floating point math scores 84067, integer math scores 64934, extended instructions score 23906, and data compression scores 276539. The data encryption score of 21367 and random string sorting score of 34082 round out a comprehensive workload profile.

The U303L has no recorded wins in any category because the database contains no benchmark scores for it. Its strengths can only be inferred from its specification profile. It uses an Intel Socket 1700 platform, which differs from the BGA 2540 socket of the Ultra 5 338H, and it supports both DDR4 and DDR5 memory, whereas the Ultra 5 338H supports LPDDR5X only. The U303L also provides 8 PCIe Gen 4 lanes compared to 4 PCIe Gen 5 lanes on the Ultra 5 338H. These platform characteristics may matter for system design choices, but they do not translate into any measured performance wins.

Architecture Differences

The two processors come from different architectural families and process nodes. The Intel Core Ultra 5 338H uses Panther Lake architecture, built on a 3 nm process at Intel foundries. It belongs to the Core Ultra Series 3 and the Panther Lake-H generation. The Intel Processor U303L uses Raptor Lake architecture, built on a 10 nm process, and belongs to the Raptor Lake-PS generation. This generational gap explains much of the performance difference. The Ultra 5 338H has 12 cores and 12 threads, while the U303L has 5 cores and 6 threads. The thread count disparity is notable: the U303L has more threads than cores, indicating hyper-threading support, while the Ultra 5 338H has a 1:1 core-to-thread ratio.

Cache hierarchies differ substantially. The Ultra 5 338H provides 192 KB of L1 cache per core, 2.5 MB of L2 cache per core, and 18 MB of shared L3 cache. The U303L provides 80 KB of L1 cache per core, 1.25 MB of L2 cache per core, and 12 MB of shared L3 cache. The Ultra 5 338H has larger per-core caches and a larger shared L3 pool. The integrated graphics also differ: the Ultra 5 338H includes Arc B370 graphics, while the U303L includes UHD Graphics 96EU. The Ultra 5 338H supports LPDDR5X memory over a dual-channel bus with a recorded memory bandwidth of 136.5 GB/s. The U303L supports DDR4 and DDR5 memory over a dual-channel bus, but the database records no memory bandwidth figure for it. Neither processor supports ECC memory.

Specification Differences

The core and thread counts differ significantly: the Ultra 5 338H has 12 cores and 12 threads, while the U303L has 5 cores and 6 threads. Clock speeds follow the same pattern. The Ultra 5 338H has a base clock of 1.90 GHz and a boost clock of 4.70 GHz. The U303L has a base clock of 1.20 GHz and a boost clock of 2.60 GHz. The boost clock difference alone is 2.1 GHz in favor of the Ultra 5 338H. Thermal design power also differs: the Ultra 5 338H is rated at 25 W, while the U303L is rated at 15 W. Both are mobile-market processors, and both are currently listed as active in production.

The sockets are different. The Ultra 5 338H uses Intel BGA 2540, while the U303L uses Intel Socket 1700. The memory support differs as noted: LPDDR5X for the Ultra 5 338H versus DDR4 and DDR5 for the U303L. PCIe support also differs: the Ultra 5 338H provides 4 PCIe Gen 5 lanes, while the U303L provides 8 PCIe Gen 4 lanes. The release dates are different as well: the Ultra 5 338H launched on 2026-01-04, while the U303L launched on 2024-04-07. Both have locked multipliers, and neither has a recorded launch MSRP for the Ultra 5 338H, though the U303L has a launch MSRP of $285. The part numbers are SA4REQ9EW for the Ultra 5 338H and SRPKEQ5CV for the U303L. The process nodes differ at 3 nm versus 10 nm, and the architectures differ as Panther Lake versus Raptor Lake.

FAQ

Q: Which processor has the higher multi-core performance?

A: The Intel Core Ultra 5 338H has recorded Cinebench R23 multi-core score of 16331, Cinebench R20 multi-core score of 10213, and Cinebench R15 multi-core score of 2504. The Intel Processor U303L has no recorded benchmark scores in the database.

Q: How do the clock speeds compare between the two processors?

A: The Ultra 5 338H has a base clock of 1.90 GHz and a boost clock of 4.70 GHz. The U303L has a base clock of 1.20 GHz and a boost clock of 2.60 GHz.

Q: What are the core and thread counts for each processor?

A: The Ultra 5 338H has 12 cores and 12 threads. The U303L has 5 cores and 6 threads.

Q: Do these processors support the same memory types?

A: No. The Ultra 5 338H supports LPDDR5X memory, while the U303L supports both DDR4 and DDR5 memory. Both use dual-channel memory buses.

Q: Which processor has a larger L3 cache?

A: The Ultra 5 338H has 18 MB of shared L3 cache, while the U303L has 12 MB of shared L3 cache.

Q: Where does the Ultra 5 338H rank among all CPUs?

A: The Ultra 5 338H sits in the 84th percentile of all CPUs with an average benchmark score of 33989. Its nearest rival, the Intel Core Ultra 7 165H, averages 34083, which is 0.3% higher.

The Verdict

The recorded data points to a clear choice for workloads that depend on raw processing power. The Intel Core Ultra 5 338H delivers benchmark results across Cinebench R15, R20, R23, and multiple PassMark tests, with a multithread score of 28717 and a single-thread score of 4180. Its 84th percentile ranking and average benchmark score of 33989 place it alongside processors like the Intel Core Ultra 7 165H, which is only 0.3% higher, and the Intel Core i7-12800HX, which is 0.3% lower. The U303L has no measured results to compare, so the data cannot support any performance claim in its favor.

The U303L may still fit systems that prioritize its platform attributes. It supports DDR4 and DDR5 memory, which offers memory flexibility, and it provides 8 PCIe Gen 4 lanes, double the lane count of the Ultra 5 338H's 4 PCIe Gen 5 lanes. Its 15 W TDP is lower than the 25 W TDP of the Ultra 5 338H, which may matter in power-constrained designs. The U303L also has a launch MSRP of $285. The Ultra 5 338H has no recorded launch MSRP.

For applications that rely on multi-threaded throughput, single-thread responsiveness, or integrated graphics capability, the data favors the Ultra 5 338H. Its 12 cores, 4.70 GHz boost clock, 18 MB L3 cache, and Arc B370 graphics represent a newer architectural generation on a 3 nm process. The U303L, with 5 cores, 2.60 GHz boost clock, 12 MB L3 cache, and UHD Graphics 96EU, belongs to an older Raptor Lake generation on a 10 nm process. The benchmark database contains no measurements for the U303L, so any selection between the two should account for the fact that the Ultra 5 338H has a complete recorded performance profile while the U303L does not.