Intel Core Ultra 5 250KF Plus vs Intel Processor U303L Comparison

FAQ

Q: How do the core and thread counts compare between the two processors?

A: The Intel Core Ultra 5 250KF Plus has 18 cores and 18 threads, while the Intel Processor U303L has 5 cores and 6 threads. The Core Ultra 5 uses a 1:1 core-to-thread ratio, whereas the U303L supports hyper-threading, giving it one additional thread over its core count.

Q: What manufacturing processes are used for each chip?

A: The Core Ultra 5 250KF Plus is built on a 3 nm process at TSMC, while the Intel Processor U303L uses a 10 nm process at Intel's own foundry. The Core Ultra 5 also has a notably larger transistor count at 17,800 million, while the U303L's transistor count is not recorded in the database.

Q: Which processor supports ECC memory?

A: Only the Intel Core Ultra 5 250KF Plus supports ECC memory. The Intel Processor U303L does not list ECC support in its specifications.

Q: Do these processors include integrated graphics?

A: The Intel Core Ultra 5 250KF Plus has no integrated graphics (listed as N/A), while the Intel Processor U303L includes UHD Graphics 96EU.

Q: What are the launch dates for these two products?

A: The Intel Processor U303L was released on April 7, 2024, while the Intel Core Ultra 5 250KF Plus was released on March 10, 2026.

Q: How do their memory support options differ?

A: The Core Ultra 5 250KF Plus supports DDR5 memory only, with a dual-channel bus and 115.2 GB/s bandwidth. The Intel Processor U303L supports both DDR4 and DDR5 memory on a dual-channel bus, but its memory bandwidth is not recorded.

Architecture Differences

The two processors come from fundamentally different design lineages. The Intel Core Ultra 5 250KF Plus belongs to the Core Ultra Series 2, using the Arrow Lake Refresh codename. It is built on a 3 nm process at TSMC with 17,800 million transistors on a 243 mm² die. The architecture generation is listed as "Ultra 5 (Arrow Lake)," and it uses the Intel Socket 1851 platform.

The Intel Processor U303L is based on the Raptor Lake architecture, specifically the Raptor Lake-PS variant, built on Intel's 10 nm process. It uses the older Intel Socket 1700 platform. The generation listing for this chip is "Intel Processor (Raptor Lake)," and it is classified as a mobile segment part.

Cache hierarchies differ substantially between the two. The Core Ultra 5 provides 192 KB of L1 cache and 3 MB of L2 cache per core, with 30 MB of shared L3 cache. The U303L provides 80 KB of L1 cache and 1.25 MB of L2 cache per core, with 12 MB of shared L3 cache. These differences reflect the Core Ultra 5's larger core count and more robust cache architecture.

The Core Ultra 5 features PCIe Gen 5 with 20 CPU lanes, while the U303L uses PCIe Gen 4 with 8 CPU lanes. The Core Ultra 5 also has an unlocked multiplier, whereas the U303L does not. The U303L includes integrated UHD Graphics 96EU, but the Core Ultra 5 relies on discrete graphics. Memory support also separates them: the Core Ultra 5 supports only DDR5, while the U303L supports both DDR4 and DDR5.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark entries between the Intel Core Ultra 5 250KF Plus and the Intel Processor U303L. The Core Ultra 5 has a comprehensive benchmark suite recorded, while the U303L has no benchmark scores listed at all. This absence of directly comparable measurements means the analysis must rely on the recorded performance data for the Core Ultra 5 and the specification-level differences between the two parts.

The Core Ultra 5's benchmark results show consistent strength across both single-threaded and multi-threaded workloads. In Cinebench R23, it scores 42,718 in multi-core and 6,030 in single-core. The Cinebench R20 results are 17,941 multi-core and 2,532 single-core, while Cinebench R15 shows 4,305 multi-core and 607 single-core. PassMark tests further detail its capabilities: multi-thread score of 50,146, single-thread score of 4,698, integer math at 123,030, floating-point math at 159,824, and extended instructions at 42,880.

The Core Ultra 5's average benchmark score is 66,159, placing it in the 93rd percentile among all CPUs in the database. Its nearest rivals in the database include the Intel Core 9 273PQE with an average score of 66,099 (0.1% difference), the AMD Ryzen 9 7950X3D at 65,914 (0.4% ahead), the Intel Core Ultra 5 250K Plus at 66,855 (1% behind), and the AMD EPYC 4465P at 66,925 (1.1% behind). These close margins indicate the Core Ultra 5 sits in a highly competitive performance tier.

Since the U303L has no recorded benchmarks, the database offers no quantitative comparison for its performance. The only measurable differences are those found in the specification fields, which show a wide gulf in core counts, clock speeds, cache sizes, and process technology.

Specification Differences

The Intel Core Ultra 5 250KF Plus and Intel Processor U303L differ across nearly every recorded specification field.

Cores and threads: The Core Ultra 5 has 18 cores and 18 threads. The U303L has 5 cores and 6 threads.

Clock speeds: The Core Ultra 5 has a base clock of 4.20 GHz and a boost clock of 5.30 GHz. The U303L has a base clock of 1.20 GHz and a boost clock of 2.60 GHz.

TDP: The Core Ultra 5 has a TDP of 125 W, whereas the U303L has a TDP of 15 W.

Socket: The Core Ultra 5 uses Intel Socket 1851; the U303L uses Intel Socket 1700.

Process node: The Core Ultra 5 uses a 3 nm process at TSMC. The U303L uses a 10 nm process at Intel.

Transistors and die size: The Core Ultra 5 has 17,800 million transistors and a 243 mm² die size. The U303L has no recorded transistor count or die size.

Cache: The Core Ultra 5 has 192 KB L1 per core, 3 MB L2 per core, and 30 MB shared L3. The U303L has 80 KB L1 per core, 1.25 MB L2 per core, and 12 MB shared L3.

Memory: The Core Ultra 5 supports DDR5 only, with 115.2 GB/s bandwidth. The U303L supports DDR4 and DDR5, with no bandwidth figure recorded.

ECC: The Core Ultra 5 supports ECC memory; the U303L does not.

PCIe: The Core Ultra 5 offers PCIe Gen 5 with 20 CPU lanes. The U303L offers PCIe Gen 4 with 8 CPU lanes.

Integrated graphics: The Core Ultra 5 has no iGPU. The U303L includes UHD Graphics 96EU.

Market segment: The Core Ultra 5 is a desktop part. The U303L is a mobile part.

Multiplier: The Core Ultra 5 has an unlocked multiplier; the U303L does not.

Launch MSRP: The Core Ultra 5 has a launch MSRP of $184. The U303L has a launch MSRP of $285.

Release date: The Core Ultra 5 was released March 10, 2026. The U303L was released April 7, 2024.

Where Each One Wins

The Intel Core Ultra 5 250KF Plus wins on essentially every performance-related dimension recorded in the database. Its 18 cores and 5.30 GHz boost clock position it for demanding multi-threaded workloads and high-frequency single-threaded tasks. The 30 MB of shared L3 cache, 3 MB per-core L2 cache, and 115.2 GB/s memory bandwidth provide the resources needed for sustained computational throughput. The 93rd percentile ranking among all CPUs confirms its placement in the upper tier of processor performance.

The Core Ultra 5 also wins on platform capability. PCIe Gen 5 with 20 lanes offers substantially more I/O bandwidth than the U303L's PCIe Gen 4 with 8 lanes. ECC memory support makes it suitable for workstation and reliability-focused environments. The unlocked multiplier allows tuning for users who require flexibility in clock configuration. Its desktop market segment and 125 W TDP indicate it is designed for systems with adequate cooling and power delivery.

The Intel Processor U303L wins on power efficiency and integration. Its 15 W TDP is dramatically lower than the Core Ultra 5's 125 W, making it suited for power-constrained mobile applications. The integrated UHD Graphics 96EU removes the need for a discrete GPU in systems that only require basic display output. Its support for both DDR4 and DDR5 memory provides flexibility for system builders working with existing memory inventories. The mobile market segment, Socket 1700 compatibility, and 2024 release date make it a relevant option for low-power embedded or portable designs.

The Verdict

The Intel Core Ultra 5 250KF Plus is the clear performance leader in this comparison. Its 18 cores, 5.30 GHz boost clock, 30 MB L3 cache, and 3 nm process technology place it in the 93rd percentile of all CPUs in the database. The benchmark data confirms strong multi-threaded and single-threaded results, with an average score of 66,159 and narrow margins against top-tier rivals like the AMD Ryzen 9 7950X3D and Intel Core 9 273PQE. For desktop systems requiring maximum compute throughput, ECC support, PCIe Gen 5 connectivity, and overclocking capability, the Core Ultra 5 is the appropriate choice.

The Intel Processor U303L serves a different purpose entirely. With 5 cores, 6 threads, a 15 W TDP, and integrated graphics, it is built for efficiency rather than peak performance. Its dual memory support and mobile segment classification suit compact or low-power systems where the Core Ultra 5's 125 W TDP and desktop socket would be impractical. The U303L has no recorded benchmark scores in the database, so its performance cannot be quantified against the Core Ultra 5, but its specification profile clearly targets a different workload class.

The decision between these two processors depends on the intended use case. The Core Ultra 5 250KF Plus suits high-performance desktop builds, content creation workstations, and compute-heavy tasks. The Intel Processor U303L suits low-power mobile platforms, basic computing, and systems requiring integrated graphics with flexible memory options. The 93rd percentile ranking of the Core Ultra 5 versus the 50th percentile ranking of the U303L reflects the performance gap, though the U303L's efficiency advantages remain relevant for its target segment.