Intel Core i3-10305 vs Intel Core i5-9600 Comparison

Head-to-Head Benchmarks

The benchmark data places the Intel Core i5-9600 ahead of the Intel Core i3-10305 across every recorded Cinebench test. The head-to-head results show six wins for the i5-9600 and zero for the i3-10305, with margins ranging from 3.6% to 4.1%. These are consistent gaps, not outliers, and they appear in both single-core and multi-core workloads.

Starting with multi-core performance, the Cinebench R15 multicore test shows the i5-9600 scoring 820 against the i3-10305’s 788, a 4.1% advantage. In Cinebench R20 multicore, the i5-9600 scores 3419 while the i3-10305 manages 3287, a 4% lead. The Cinebench R23 multicore result follows the same pattern: 8141 for the i5-9600 versus 7828 for the i3-10305, again 4% ahead. These results indicate that despite having fewer threads, the i5-9600 maintains a measurable lead in multi-threaded rendering tasks.

Single-core performance shows a similar story, though with slightly smaller margins. In Cinebench R15 single-core, the i5-9600 scores 115 versus 111 for the i3-10305, a 3.6% difference. Cinebench R20 single-core has the i5-9600 at 482 and the i3-10305 at 464, a 3.9% gap. In Cinebench R23 single-core, the i5-9600 scores 1149 against 1105, a 4% lead. The consistency across all three Cinebench versions suggests the single-core advantage is stable, not a product of one particular test iteration.

Looking at the average benchmark score, the i5-9600 records 2354 against the i3-10305’s 2264. This places the i5-9600 at the 48th percentile among all CPUs in the database, while the i3-10305 sits at the 47th percentile. The difference is small in percentile terms, but the absolute scores show the i5-9600 holding a 3.9% advantage in average performance. The nearest rivals for the i5-9600 include the Intel Xeon E3-1285 v6 with an average score of 2348, which is 0.3% behind, and the AMD Ryzen 5 2500X at 2361, which is 0.3% ahead. The i3-10305’s nearest rivals include the Intel Core i7-1068NG7 at 2259, 0.2% behind, and the Intel Core i5-9400 at 2254, 0.4% behind.

The data shows that the i5-9600 wins every benchmark in this comparison. There is no test where the i3-10305 takes the lead, and the margins are consistent enough to indicate a genuine performance gap rather than measurement noise. The largest single delta is 4.1% in Cinebench R15 multicore, while the smallest is 3.6% in Cinebench R15 single-core. All other deltas sit at 3.9% or 4%.

Where Each One Wins

The i5-9600 wins in every recorded workload category, so the practical distinction comes down to the size of the advantage and the nature of the task. In multi-core scenarios, the i5-9600’s lead is consistent at 4% to 4.1% across R15, R20, and R23. This applies to rendering, video encoding, and other heavily threaded tasks where all cores are utilized. The i5-9600’s six physical cores, even without Hyper-Threading, deliver higher scores than the i3-10305’s four cores with eight threads.

In single-core workloads, the i5-9600 also wins, with margins from 3.6% to 4%. This matters for applications that rely on high-frequency single-thread performance, such as older games, spreadsheet calculations, and lightly threaded productivity software. The i5-9600’s boost clock matches the i3-10305 at 4.50 GHz, yet its recorded scores are higher, indicating that the architecture and cache configuration contribute to the advantage.

For users who prioritize multi-threaded throughput, the i5-9600 is the clear pick based on the data. For users who prioritize single-thread responsiveness, the i5-9600 still holds the edge, albeit by a slightly smaller margin in R15. There is no workload category in the benchmark set where the i3-10305 wins, so the i3-10305’s case rests on other factors such as platform compatibility, not on measured performance.

The percentile data reinforces this. The i5-9600 sits at the 48th percentile versus 47th for the i3-10305, meaning both CPUs are near the middle of the database’s performance distribution. The i3-10305’s nearest rival, the Intel Core i5-9400, is only 0.4% behind it, which places the i3-10305 in a tightly contested performance tier. The i5-9600, by contrast, sits among rivals like the AMD Ryzen 5 2500X, which is only 0.3% ahead, indicating that the i5-9600 is competitive with a slightly higher-performing peer group.

Architecture Differences

The two processors come from different Intel generations and use different sockets. The i5-9600 is built on the Coffee Lake architecture, uses the Intel Socket 1151, and belongs to the Core i5 Coffee Lake Refresh generation. The i3-10305 uses the Comet Lake architecture, specifically the Comet Lake-R codename, and fits the Intel Socket 1200. This means they are not socket-compatible; a motherboard designed for one will not accept the other.

Both CPUs are manufactured on the 14 nm process node at Intel, so the underlying transistor geometry is identical. The core counts differ significantly. The i5-9600 has six cores and six threads, while the i3-10305 has four cores and eight threads. The i3-10305 compensates for fewer physical cores with Hyper-Threading, which allows it to process eight threads simultaneously. The i5-9600 does not support Hyper-Threading, so its thread count equals its core count.

Clock speeds are close but not identical. The i5-9600 has a base clock of 3.10 GHz and a boost clock of 4.50 GHz. The i3-10305 has a higher base clock of 3.80 GHz but the same boost clock of 4.50 GHz. The higher base clock on the i3-10305 does not translate into higher benchmark scores, as the recorded data shows the i5-9600 winning all tests. Both CPUs have a TDP of 65 watts, so power draw classification is the same.

Cache configurations differ. Both CPUs have 64 KB of L1 cache per core and 256 KB of L2 cache per core, but the shared L3 cache is larger on the i5-9600: 9 MB shared versus 8 MB shared on the i3-10305. The extra 1 MB of L3 cache likely contributes to the i5-9600’s consistent lead in both single-core and multi-core benchmarks, as more cache can reduce memory latency and improve data reuse.

Memory support is identical on paper. Both support DDR4 memory in a dual-channel configuration, and both have a memory bandwidth of 42.7 GB/s. Neither supports ECC memory. PCIe connectivity is also the same: Gen 3 with 16 lanes from the CPU. Integrated graphics are present on both, with the i5-9600 featuring UHD 630 and the i3-10305 featuring UHD Graphics 630. These are the same integrated graphics solution in practical terms, though the naming differs slightly.

The i5-9600 was released on 2018-10-18 and is marked as end-of-life. The i3-10305 was released on 2021-03-15 and is marked as active. Both have locked multipliers, so neither supports overclocking through multiplier adjustment. The part numbers are SR3X2 for the i5-9600 and SRH3K for the i3-10305.

The Verdict

The data points to the Intel Core i5-9600 as the stronger performer in every benchmark recorded. It wins all six head-to-head tests, with deltas between 3.6% and 4.1%. Its average benchmark score of 2354 is 90 points higher than the i3-10305’s 2264, and it occupies a higher percentile rank at 48 versus 47. For anyone choosing between these two purely on measured performance, the i5-9600 is the answer.

The i3-10305 has one structural advantage: it is an active product with a newer release date, while the i5-9600 is end-of-life. The i3-10305 also uses Socket 1200, which is a newer platform, whereas the i5-9600 uses Socket 1151. These platform considerations matter for system builders who need a current motherboard ecosystem or who prefer a processor that is still in production. The i3-10305 also has eight threads versus six, which could theoretically benefit workloads that scale with thread count, but the recorded benchmark data does not show such a benefit. In fact, the i5-9600 wins multi-core tests despite having fewer threads.

The i5-9600’s larger 9 MB L3 cache and six physical cores appear to outweigh the i3-10305’s higher base clock and Hyper-Threading. The benchmark results are unambiguous: the i5-9600 leads in every Cinebench version, from R15 to R23, in both single-core and multi-core modes. The margins are not huge, but they are consistent, which suggests a real architectural advantage rather than a test-specific anomaly.

Buyers who already have a Socket 1151 motherboard and can source an i5-9600 will get the better measured performance. Buyers who need a current-production CPU or a Socket 1200 platform will have to accept the i3-10305’s lower scores. The i3-10305 is not a weak processor; it sits at the 47th percentile and outperforms rivals like the Intel Core i5-9400 by 0.4% and the Intel Core i7-10710U by 0.7%. But in this direct comparison, the i5-9600 is ahead on every metric the database records.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core i5-9600 has an average benchmark score of 2354, while the Intel Core i3-10305 scores 2264.

Q: How many cores and threads does each CPU have?

A: The i5-9600 has 6 cores and 6 threads. The i3-10305 has 4 cores and 8 threads.

Q: What is the largest performance gap in the head-to-head results?

A: The largest gap is 4.1% in the Cinebench R15 multicore test, where the i5-9600 scores 820 and the i3-10305 scores 788.

Q: Do the two CPUs use the same socket?

A: No. The i5-9600 uses Intel Socket 1151, while the i3-10305 uses Intel Socket 1200.

Q: Which processor has more L3 cache?

A: The i5-9600 has 9 MB of shared L3 cache, while the i3-10305 has 8 MB of shared L3 cache.

Q: Are both CPUs unlocked for overclocking?

A: No. Both the i5-9600 and the i3-10305 have locked multipliers.

Q: What is the release status of each processor?

A: The i5-9600 is marked as end-of-life and was released on 2018-10-18. The i3-10305 is marked as active and was released on 2021-03-15.