Intel Core 3 305 vs Intel Core 5 120 Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive overall victory for the Intel Core 5 120, which wins 14 of the 17 head-to-head comparisons. The Intel Core 3 305 takes only three wins, but two of those are notable single-threaded results that reveal a different performance profile.

The largest margins belong to the Core 5 120 in compute-heavy workloads. In Cinebench R23 multi-core, the Core 5 120 scores 18255 against 13123 for the Core 3 305, a delta of 28.1%. The same pattern holds across the entire Cinebench suite: R15 multi-core shows 1840 versus 1322 (28.2% delta), R20 multi-core shows 7667 versus 5511 (28.1% delta), and single-core tests show identical deltas of 28.2% in R15 and 28.1% in R20 and R23. The Core 5 120's single-core Cinebench scores are consistently higher: 259 versus 186 in R15, 1082 versus 777 in R20, and 2577 versus 1852 in R23.

The widest gap comes in PassMark integer math, where the Core 5 120 delivers 60462 versus 32295, a 46.6% advantage. Data compression shows a 33.1% delta (219535 versus 146857), and random string sorting favors the Core 5 120 by 18% (21499 versus 17623). PassMark multithread results show 18597 versus 15439, a 17% delta, while floating-point math is closer at 45383 versus 42284, a 6.8% delta. Physics tests give the Core 5 120 a 7.5% edge (1333 versus 1233), and extended instructions show a 5.1% delta (14264 versus 13543). Data encryption is nearly a tie: 11131 versus 11019, a 1% delta.

The Core 3 305's wins are concentrated in two PassMark tests. It leads by 49.4% in finding prime numbers (115 versus 77), and it posts a 10.6% advantage in single-threaded PassMark (3977 versus 3595). These two results appear twice in the data, once under the single_thread label and once under singlethread, confirming the same scores.

Interpreting the Cinebench deltas, the Core 5 120 holds a remarkably consistent 28% lead across both multi-core and single-core workloads in that suite. This consistency suggests a fundamental architectural advantage rather than a workload-specific quirk. The PassMark results add nuance: the Core 3 305's single-thread score of 3977 outpaces the Core 5 120's 3595, yet the Core 5 120 wins every Cinebench single-core test by over 28%. The divergence between PassMark's single-thread methodology and Cinebench's single-core methodology is substantial enough to affect the relative ranking.

Architecture Differences

The two processors come from different Intel families with distinct design philosophies. The Core 3 305 uses the Wildcat Lake codename and a 3 nm process node, fabricated by Intel. The Core 5 120 uses the Raptor Lake-R codename, belongs to the Raptor Lake architecture, and employs a 10 nm process node with a die size of 163 mm². The process node difference is significant: 3 nm versus 10 nm, which explains some of the power and efficiency characteristics visible in the data.

Core counts are identical at six cores, but thread counts differ. The Core 3 305 runs six threads, so each core handles one thread. The Core 5 120 runs 12 threads, meaning each core supports two threads via Hyper-Threading. This thread advantage contributes directly to the Core 5 120's multi-threaded benchmark wins, especially in integer math and data compression where parallel efficiency matters.

Clock speeds also favor the Core 5 120. Its base clock is 2.50 GHz with a boost clock of 4.50 GHz, compared to the Core 3 305's 1.50 GHz base and 4.30 GHz boost. The higher base clock gives the Core 5 120 a sustained performance edge in steady-state workloads, while the boost clocks are relatively close.

Cache hierarchies differ substantially. The Core 3 305 has 192 KB of L1 cache, 2.5 MB of L2 cache, and 6 MB of shared L3 cache. The Core 5 120 has 80 KB of L1 cache per core, 1.25 MB of L2 cache per core, and 18 MB of shared L3 cache. With six cores, the Core 5 120's aggregate L2 cache reaches 7.5 MB, three times the Core 3 305's total. The L3 advantage is larger still: 18 MB versus 6 MB, a threefold difference.

Memory support also separates them. The Core 3 305 supports DDR5 and LPDDR5X with a single-channel memory bus and 59.7 GB/s of memory bandwidth. The Core 5 120 supports DDR4 and DDR5 with a dual-channel memory bus; the database does not record a bandwidth figure for it. The dual-channel configuration likely contributes to the Core 5 120's performance in memory-sensitive workloads, though the missing bandwidth number prevents a direct comparison.

PCIe connectivity differs as well. The Core 3 305 provides Gen 4 with 6 lanes from the CPU, while the Core 5 120 provides Gen 5 with 16 lanes from the CPU. The Core 5 120 offers both a newer PCIe generation and more lanes, which matters for discrete GPUs and high-speed storage. Integrated graphics also differ: the Core 3 305 features Intel Xe3 Graphics with one Xe core, while the Core 5 120 uses UHD Graphics 730.

Thermal design power and sockets further separate them. The Core 3 305 draws 15 W TDP and uses Intel BGA 1516, a mobile socket. The Core 5 120 draws 65 W TDP and uses Intel Socket 1700, a desktop socket. The market segments match these physical differences: the Core 3 305 targets mobile, the Core 5 120 targets desktop. The release dates also differ, with the Core 3 305 launching on 2026-04-15 and the Core 5 120 on 2025-07-30.

Where Each One Wins

The Core 5 120 dominates in almost every category that benefits from additional threads, larger caches, and higher clock speeds. Multi-threaded compute workloads show its strength: Cinebench R23 multi-core, PassMark integer math, data compression, random string sorting, and multithread tests all go to the Core 5 120 by double-digit margins. The 46.6% integer math advantage and 33.1% data compression advantage indicate strong performance in productivity tasks, compilation, and file archiving. The 18% random string sorting edge and 17% multithread edge reinforce this pattern.

Single-core Cinebench results also favor the Core 5 120, with consistent 28% deltas across R15, R20, and R23. This indicates that for lightly threaded applications like games, web browsing, and office productivity, the Core 5 120's higher clock speeds and architectural efficiency deliver measurable gains. The floating-point math result (6.8% delta) and physics result (7.5% delta) suggest moderate advantages in scientific computing and simulation workloads.

The Core 3 305's wins are narrower in scope but meaningful in specific contexts. Its 49.4% advantage in finding prime numbers is the largest single delta in either direction, suggesting a peculiar strength in certain integer workloads that do not scale with thread count. The PassMark single-thread score of 3977 versus 3595, a 10.6% delta, indicates that the Core 3 305 has a faster single-threaded execution path in PassMark's methodology, even though Cinebench disagrees. This could reflect different instruction mixes or memory latency characteristics.

The near-tie in data encryption (1% delta) shows that encryption workloads are roughly equivalent between the two, despite the Core 5 120's overall performance advantage. This could indicate that AES-NI or similar instruction paths are similarly efficient on both processors. Extended instructions show a modest 5.1% delta in favor of the Core 5 120, suggesting comparable SIMD or vectorized workload performance.

For power-sensitive mobile use, the Core 3 305's 15 W TDP versus the Core 5 120's 65 W TDP represents a large efficiency gap, though the data does not include battery life or power draw measurements. The Core 3 305's single-channel memory and smaller L3 cache likely contribute to its lower power envelope.

FAQ

Q: Which processor has more threads?

A: The Intel Core 5 120 has 12 threads from six cores, while the Intel Core 3 305 has six threads from six cores. The Core 5 120 supports two threads per core.

Q: How do the Cinebench R23 scores compare?

A: The Core 5 120 scores 18255 in multi-core and 2577 in single-core. The Core 3 305 scores 13123 in multi-core and 1852 in single-core. The Core 5 120 leads by 28.1% in both tests.

Q: What is the difference in process node?

A: The Core 3 305 uses a 3 nm process node, while the Core 5 120 uses a 10 nm process node. Both are fabricated by Intel.

Q: Which processor has a larger L3 cache?

A: The Core 5 120 has 18 MB of shared L3 cache, three times the Core 3 305's 6 MB of shared L3 cache.

Q: Do both processors support ECC memory?

A: No, neither processor supports ECC memory according to the database.

Q: What are the memory bus configurations?

A: The Core 3 305 uses a single-channel memory bus with DDR5 and LPDDR5X support. The Core 5 120 uses a dual-channel memory bus with DDR4 and DDR5 support.

Q: Which processor wins more head-to-head benchmarks?

A: The Core 5 120 wins 14 of 17 comparisons. The Core 3 305 wins three, including PassMark single-thread and prime number tests.

The Verdict

The benchmark data clearly positions the Intel Core 5 120 as the stronger overall processor. It wins 14 of 17 head-to-head tests, holds a 77th percentile ranking versus all CPUs, and posts an average benchmark score of 25362. Its nearest rival, the AMD Ryzen 5 5600X3D, matches it exactly at 25365, while the Intel Core i7-11700KF trails by 0.2% and the AMD Ryzen 7 7840U trails by 0.3%. The Core 5 120 also edges out the Intel Core i5-13400F by 0.3%. These comparisons place it in solid company among mid-range desktop processors.

The Intel Core 3 305, by contrast, sits at the 72nd percentile with an average benchmark score of 18302. Its nearest rivals are the Intel Core i3-14100 at 18318 (0.1% ahead), the Intel Core 5 330 at 18345 (0.2% ahead), and the Intel Core 7 360 at 18374 (0.4% ahead). The AMD Ryzen 5 2600E trails by 0.4% at 18230. The Core 3 305's average score is 28% lower than the Core 5 120's, consistent with the Cinebench deltas.

For desktop users prioritizing compute throughput, multi-threaded productivity, and gaming single-core performance, the Core 5 120 is the clear choice. Its 12 threads, 18 MB L3 cache, dual-channel memory, and Gen 5 PCIe support make it suitable for a wide range of workloads. The 65 W TDP and Socket 1700 compatibility fit standard desktop builds.

For mobile users or those prioritizing power efficiency, the Core 3 305 offers a 15 W TDP, a 3 nm process node, and a 10.6% PassMark single-thread advantage over the Core 5 120. Its single-channel memory and 6 MB L3 cache limit performance in memory-heavy tasks, but its efficiency profile and integrated Xe3 Graphics could serve thin-and-light laptops. The Core 3 305's launch MSRP is $309, while the Core 5 120's launch MSRP is $211.

The data does not support a single recommendation for all use cases. The Core 5 120 wins on raw performance, particularly in multi-threaded integer math, compression, and Cinebench workloads. The Core 3 305 wins on efficiency and a specific PassMark single-thread metric, plus the prime number test. Users who need sustained multi-threaded performance should select the Core 5 120; users who prioritize low power draw and mobile form factors should consider the Core 3 305.