CPU Comparison

Intel Processor U300 and Intel Core i3-9350K represent two distinctly different Intel design philosophies: one is a modern, low-power mobile hybrid from the Raptor Lake generation, while the other is a legacy, high-power desktop quad-core from the Coffee Lake era. Benchmark data reveals a split decision, with the U300 dominating in single-threaded workloads and the i3-9350K taking the crown in a specific multi-threaded test. The following analysis breaks down where each processor wins, the architectural foundations for those results, and which user should consider each chip based strictly on the provided facts.

Where Each One Wins

The head-to-head benchmark results show a clear division of labor. The Intel Processor U300 wins three of the four comparative tests, with its most decisive victories coming in single-core performance. In Cinebench R15 single-core, the U300 scores 222 against the i3-9350K’s 91, a massive 144% delta. Similarly, in Cinebench R23 single-core, the U300 posts 1616 versus 911, a 77.4% advantage. These results indicate that the U300’s architecture and higher efficiency per clock are overwhelmingly superior in lightly-threaded tasks, making it the clear choice for applications that rely on a single fast core.

The i3-9350K, however, claims victory in the Cinebench R23 multi-core test. It scores 6456 against the U300’s 4905, a 24% lead. This is the only test where the i3-9350K wins, and it demonstrates that its four physical cores, when fully loaded, can outpace the U300’s five-core hybrid arrangement in sustained multi-threaded rendering. Notably, the i3-9350K does not have benchmark results for Cinebench R15 multi-core in the head-to-head data where it lost, but it does have a separate R20 multi-core score of 2711, which is not compared directly. The single-core results are not close; the U300’s advantage is so pronounced that it overshadows the i3’s multi-core win in terms of overall architectural efficiency.

Architecture Differences

The architectural gap between these two processors is substantial. The Intel Processor U300 is built on a 10 nm process node and uses the Raptor Lake-U architecture, codenamed Raptor Lake. It features 5 cores and 6 threads, with a base clock of 1200 MHz and a boost clock of 4.40 GHz. This is a mobile part with a 15 W TDP, designed for efficiency and battery life. Its cache hierarchy includes 80 KB of L1 per core, 1.25 MB of L2 per core, and 8 MB of shared L3. The U300 supports both DDR4 and DDR5 memory in a dual-channel configuration, and it provides PCIe Gen 4 with 8 lanes from the CPU. It has integrated UHD Graphics 48EU and is currently marked as Active in production, with a launch MSRP of $193.

In contrast, the Intel Core i3-9350K is a desktop processor from the Coffee Lake generation, built on the older 14 nm process. It has 4 cores and 4 threads, with a much higher base clock of 4.00 GHz and a boost clock of 4.60 GHz. Its TDP is 91 W, reflecting a power-hungry desktop design. The cache sizes are smaller per core: 64 KB L1, 256 KB L2, and 8 MB shared L3. It supports only DDR4 memory in dual-channel mode, with a specified memory bandwidth of 38.4 GB/s. The i3-9350K has a die size of 126 mm², uses PCIe Gen 3 with 16 lanes, and includes UHD 630 integrated graphics. It also supports ECC memory, a feature absent on the U300. The part is end-of-life and was launched with an MSRP of $184, and it has an unlocked multiplier for overclocking, which the U300 lacks.

The fundamental differences are clear: the U300 is a newer, more efficient mobile chip with higher per-core performance due to architectural improvements, while the i3-9350K is an older, higher-clocked desktop chip with more raw multi-threaded throughput in one specific test but significantly weaker single-core performance. The U300’s hybrid core arrangement and newer node allow it to achieve higher single-thread scores despite a lower boost clock, while the i3’s higher base clock and dedicated desktop design help it in sustained all-core workloads.

The Verdict

Based strictly on the benchmark data, the Intel Processor U300 is the superior processor for most general-purpose tasks. Its 144% lead in Cinebench R15 single-core and 77.4% lead in R23 single-core indicate that any application which relies on fast single-thread performance, such as older games, office productivity, or web browsing, will run significantly better on the U300. The U300 also wins the Cinebench R15 multi-core test with a 20.2% margin, showing that its efficiency advantage extends to some multi-threaded scenarios. The average benchmark score for the U300 is 1881, placing it at the 43rd percentile of all CPUs, while the i3-9350K has an average score of 1867 and sits at the 42nd percentile. This indicates that, on average, the U300 is marginally faster across the entire benchmark suite.

The Intel Core i3-9350K is only the better choice in scenarios that specifically require maximum multi-threaded rendering performance, as evidenced by its 24% win in Cinebench R23 multi-core. This suggests that for workloads like video encoding or 3D rendering that can utilize all cores effectively for extended periods, the i3-9350K can outperform the U300. However, this advantage is isolated to a single test, and the i3-9350K is an end-of-life product with a higher TDP and no DDR5 support. For a modern system builder, the U300’s combination of superior single-core speed, lower power draw, and active production status makes it the more versatile and future-proof option.

FAQ

Q: Which processor has a higher single-core benchmark score?

A: The Intel Processor U300 is significantly faster in single-core tests. It scores 222 in Cinebench R15 single-core and 1616 in Cinebench R23 single-core, compared to the i3-9350K’s 91 and 911, respectively.

Q: Does the Intel Core i3-9350K win any benchmark comparisons?

A: Yes, the i3-9350K wins the Cinebench R23 multi-core test. It scores 6456 against the U300’s 4905, a 24% lead.

Q: What is the difference in core and thread counts?

A: The Intel Processor U300 has 5 cores and 6 threads, while the Intel Core i3-9350K has 4 cores and 4 threads.

Q: Which processor supports DDR5 memory?

A: The Intel Processor U300 supports both DDR4 and DDR5 memory. The Intel Core i3-9350K supports only DDR4.

Q: What are the TDP ratings for these processors?

A: The Intel Processor U300 has a TDP of 15 W, indicating a low-power mobile design. The Intel Core i3-9350K has a TDP of 91 W, typical of a desktop processor.

Q: Is the Intel Core i3-9350K still in production?

A: No, the Intel Core i3-9350K is marked as end-of-life. The Intel Processor U300 is currently marked as active in production.

Head-to-Head Benchmarks

The most striking result in the head-to-head comparison is the Cinebench R15 single-core test. The Intel Processor U300 scores 222, while the Intel Core i3-9350K scores just 91. This represents a 144% delta, meaning the U300 is nearly two and a half times faster in this test. This is an extraordinary margin and highlights the generational leap in single-thread performance between Raptor Lake and Coffee Lake. The U300’s newer architecture, even with a lower boost clock of 4.40 GHz compared to the i3’s 4.60 GHz, delivers vastly superior instruction-per-clock efficiency.

In Cinebench R23 single-core, the margin narrows slightly but remains decisive. The U300 scores 1616 against the i3-9350K’s 911, a 77.4% delta. This consistency across different Cinebench versions confirms that the U300’s single-core advantage is not an anomaly but a fundamental architectural strength. For any user prioritizing applications that are not fully multi-threaded, this data strongly favors the U300.

The Cinebench R15 multi-core test also goes to the U300, with a score of 781 versus the i3-9350K’s 650, a 20.2% delta. This is interesting because the i3-9350K has a significantly higher base clock (4.00 GHz) and boost clock (4.60 GHz) than the U300 (1.20 GHz base, 4.40 GHz boost). The U300’s win here suggests that its hybrid core configuration and efficiency allow it to beat the older desktop chip even in a multi-threaded scenario, likely due to better sustained performance and thermal management within the benchmark’s duration.

The only benchmark where the i3-9350K emerges victorious is Cinebench R23 multi-core. Here, the i3 scores 6456, while the U300 scores 4905. The delta is -24%, indicating the i3 is 24% faster. This is a substantial lead and suggests that in a longer, more demanding multi-threaded workload, the i3-9350K’s four full-power cores can outpace the U300’s five-core setup. The R23 multi-core test is known for being more prolonged and stressful than R15, which may explain why the i3’s higher sustained clock speeds and desktop-oriented power delivery give it the edge. This single win prevents the U300 from achieving a clean sweep and shows that the i3-9350K still holds relevance for heavy rendering tasks. Overall, the benchmark data shows a U300 victory in three out of four tests, with the i3-9350K holding a narrow but significant performance niche in one specific workload.