Intel Core i5-8305G vs Intel Processor U300 Comparison

Head-to-Head Benchmarks

The benchmark data presents a clear split between these two mobile processors, with the Intel Processor U300 taking three of the four head-to-head victories, while the Intel Core i5-8305G claims one decisive win. The most striking result comes from the Cinebench R23 multi-core test, where the older i5-8305G scores 5739 against the U300's 4905, a 17% advantage. This is the single largest margin of victory for the i5-8305G, and it demonstrates that the older chip's four cores and eight threads can still outpace the newer processor in sustained multi-threaded workloads.

However, the Intel Processor U300 dominates in the other three comparisons. In Cinebench R15 multi-core, the U300 posts 781 points versus 578 for the i5-8305G, a 26% deficit for the older chip. The single-core results are even more lopsided. In Cinebench R15 single-core, the U300 scores 222 against a mere 81 for the i5-8305G, a 63.5% gap. Cinebench R23 single-core shows a similar pattern: the U300 delivers 1616 points while the i5-8305G manages only 810, a 49.9% difference. These single-core numbers reveal a fundamental generational leap in per-core performance.

The average benchmark scores reflect this mixed picture. The Intel Processor U300 holds a higher average score of 1881 compared to 1831 for the i5-8305G. Both processors sit near the 42nd and 43rd percentiles respectively among all CPUs in the database, meaning they are closely matched in overall standing despite their very different architectures.

Architecture Differences

The two processors come from different generations and use fundamentally different designs. The Intel Core i5-8305G is built on Kaby Lake architecture, specifically the Kaby Lake G codename, using a 14 nm process node from Intel. It features 4 cores and 8 threads, with a base clock of 2.80 GHz and a boost clock of 3.80 GHz. The thermal design power is 65 watts, which is substantially higher than the newer part.

The Intel Processor U300 belongs to the Raptor Lake family, specifically Raptor Lake-U, manufactured on a 10 nm process node. It has 5 cores and 6 threads, a base clock of 1200.00 MHz, and a boost clock of 4.40 GHz. Its thermal design power is just 15 watts, reflecting a much more power-efficient design. The socket differs as well: the i5-8305G uses Intel BGA 2270, while the U300 uses Intel BGA 1744.

Cache hierarchies show notable differences. The i5-8305G provides 64 KB of L1 cache per core, 256 KB of L2 per core, and 6 MB of shared L3 cache. The U300 offers 80 KB of L1 per core, 1.25 MB of L2 per core, and 8 MB of shared L3 cache. The larger L2 allocation per core in the U300 helps explain its strong single-core performance, as more data can reside closer to the execution units.

Memory support diverges significantly. The i5-8305G supports DDR4 memory only, while the U300 supports both DDR4 and DDR5, with dual-channel memory bus. The U300 also brings PCIe Gen 4 with 8 lanes from the CPU, whereas the i5-8305G does not have a listed PCIe specification in the database. Integrated graphics differ as well: the i5-8305G pairs with a Radeon RX Vega M GL, a discrete-class GPU solution, while the U300 uses UHD Graphics 48EU. Neither processor supports ECC memory, and both have locked multipliers.

Release dates place these chips in different eras. The i5-8305G launched on January 31, 2018, while the Intel Processor U300 arrived on January 3, 2023, a five-year gap that explains much of the architectural evolution. The U300 has a launch MSRP of $193; the i5-8305G has no listed launch MSRP in the database.

Where Each One Wins

The Intel Core i5-8305G wins in sustained multi-threaded rendering workloads. Its Cinebench R23 multi-core score of 5739 outpaces the U300 by 17%, indicating that for tasks that can fully utilize all eight threads, the older chip retains an advantage. This could matter for video encoding, 3D rendering, or other professional workloads where long-running parallel tasks dominate. The 65-watt TDP gives the i5-8305G more thermal headroom to maintain high clocks across all cores, which the recorded data confirms.

The Intel Processor U300 wins decisively in single-core performance and in the older Cinebench R15 multi-core test. The R15 multi-core result of 781 versus 578 suggests that for shorter or less perfectly parallelized workloads, the U300's newer architecture and higher boost clock of 4.40 GHz provide a substantial edge. The single-core results are the most dramatic: a 63.5% advantage in R15 and a 49.9% advantage in R23. These numbers indicate that day-to-day tasks like web browsing, office applications, and lightly threaded software will feel significantly snappier on the U300.

The U300 also wins on efficiency by the numbers available. Its 15-watt TDP is dramatically lower than the i5-8305G's 65-watt TDP, making it better suited for thin-and-light laptops where battery life and thermal management are priorities. The higher average benchmark score of 1881 versus 1831, combined with a lower power envelope, suggests the U300 delivers more performance per watt, although the database does not provide direct efficiency metrics.

FAQ

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

A: The Intel Processor U300 is clearly ahead. In Cinebench R15 single-core, it scores 222 versus 81 for the i5-8305G, a 63.5% advantage. In Cinebench R23 single-core, it scores 1616 versus 810, a 49.9% lead.

Q: Does the older i5-8305G win any benchmark?

A: Yes. The i5-8305G wins the Cinebench R23 multi-core test with a score of 5739 against the U300's 4905, a 17% margin. This is its only head-to-head victory out of four recorded tests.

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

A: The Intel Core i5-8305G has 4 cores and 8 threads. The Intel Processor U300 has 5 cores and 6 threads. The U300 has more physical cores but fewer threads because it does not offer simultaneous multithreading on all cores.

Q: How do their thermal design powers compare?

A: The i5-8305G has a TDP of 65 watts, while the Intel Processor U300 has a TDP of 15 watts. This makes the U300 a much more power-efficient option for mobile devices.

Q: What memory types does each support?

A: The i5-8305G supports DDR4 memory only. The Intel Processor U300 supports both DDR4 and DDR5, with a dual-channel memory bus configuration.

Q: Which processor has the higher average benchmark score?

A: The Intel Processor U300 has an average benchmark score of 1881, compared to 1831 for the i5-8305G. Both sit close in overall CPU percentile rankings, at 43 and 42 respectively.

The Verdict

The data points to a clear recommendation for most users: the Intel Processor U300 is the better choice for general-purpose mobile computing. Its single-core performance is dramatically superior, with a 63.5% lead in Cinebench R15 and a 49.9% lead in Cinebench R23. For typical consumer workloads that rely on single-thread responsiveness, the U300 will deliver a noticeably smoother experience. Its 15-watt TDP also makes it far more suitable for modern thin-and-light laptops, and its higher average benchmark score of 1881 confirms its overall advantage.

The Intel Core i5-8305G remains relevant only for specific use cases where multi-threaded performance is paramount. Its 17% lead in Cinebench R23 multi-core shows that the eight-thread design can still outmuscle the newer chip in heavily parallel workloads. Users running sustained rendering tasks or professional applications that scale well across all threads might prefer the i5-8305G, provided the higher 65-watt power draw is acceptable.

The benchmark record shows a 3-1 head-to-head victory for the U300, with wins in both single-core tests and the R15 multi-core test. The i5-8305G's single win in R23 multi-core is substantial but narrows the overall picture. Given the U300's five-year newer release date, lower power consumption, and better average score, the database indicates that the Intel Processor U300 is the superior processor for the vast majority of mobile users. The i5-8305G is best reserved for niche multi-threaded workloads where its specific strengths matter more than efficiency or single-core speed.