Intel Core i3-10305 vs Intel Core i5-7640X Comparison

Head-to-Head Benchmarks

The benchmark data reveals a sweeping victory for the Intel Core i3-10305 across every recorded test, with no wins recorded for the Intel Core i5-7640X. The margin is remarkably consistent, hovering near 30% in all six Cinebench comparisons. In Cinebench R15 multi-core, the i3-10305 scores 788 against the i5-7640X’s 607, a delta of 29.8%. The single-core R15 test shows a similar story: 111 versus 85, a 30.6% advantage for the i3-10305.

Moving to Cinebench R20, the pattern holds firmly. The i3-10305 posts 3287 multi-core and 464 single-core, while the i5-7640X manages 2533 and 357 respectively. Those deltas are 29.8% and 30%. The i3-10305’s lead does not waver in the newer R23 workload either: 7828 versus 6031 in multi-core and 1105 versus 851 in single-core, both again at 29.8%.

What does such a consistent delta imply? The near-identical percentage across all tests suggests the advantage is structural rather than workload-specific. The i3-10305 is not merely winning on one type of instruction mix; it is fundamentally faster in both lightly threaded and fully threaded scenarios. The i5-7640X’s best showing is its single-core R15 result, where it still trails by over 30%. There is no benchmark in the database where the i5-7640X comes within striking distance.

The average benchmark scores reinforce this gap. The i3-10305 holds an average score of 2264, while the i5-7640X averages 2167. That is a difference of roughly 4.5% in aggregate, though the head-to-head Cinebench deltas are much larger. The discrepancy stems from the i5-7640X having additional Geekbench results in its record, which are not part of the head-to-head comparison. In Geekbench, the i5-7640X scores 5137 multi-core and 1736 single-core, figures that help its overall average but do not close the Cinebench gap.

Both processors sit at the 47th percentile among all CPUs in the database, which places them in a similar performance tier overall. Yet within that tier, the i3-10305 is clearly the stronger part. The nearest rivals for the i3-10305 include the Intel Core i7-1068NG7 at an average score of 2259 (0.2% behind) and the Intel Core i5-9400 at 2254 (0.4% behind). For the i5-7640X, its closest competitors are the Intel Core i5-1145G7E at 2174 (0.3% ahead) and the AMD Ryzen 5 3400GE at 2175 (0.3% ahead). These rival clusters show that the i3-10305 competes with higher-tier mobile and desktop chips, while the i5-7640X sits alongside more modest parts.

Architecture Differences

The architectural divide between these two chips is substantial, despite both being built on Intel’s 14 nm process. The i3-10305 uses the Comet Lake architecture, specifically the Comet Lake-R codename, and belongs to the Core i3 generation. It ships on the Intel Socket 1200 platform. The i5-7640X, in contrast, uses the Kaby Lake architecture with the Kaby Lake-X codename, part of the Core i5 X-Series 7th Generation, and requires the Intel Socket 2066 platform.

Core and thread counts tell a critical part of the story. The i3-10305 offers 4 cores and 8 threads, enabling simultaneous multithreading. The i5-7640X also has 4 cores but only 4 threads, lacking hyper-threading. This difference alone explains much of the multi-core performance gap: the i3-10305 can process two threads per core, effectively doubling its thread capacity in heavily threaded workloads. The i5-7640X’s higher base clock of 3.90 GHz versus 3.80 GHz does not compensate, nor does its boost clock of 4.30 GHz against the i3-10305’s 4.50 GHz.

Cache allocation also diverges. Both share 64 KB of L1 and 256 KB of L2 per core, but the L3 cache differs: the i3-10305 has 8 MB shared, while the i5-7640X has 6 MB shared. That extra 2 MB of L3 on the i3-10305 can reduce memory latency for frequently accessed data, a factor that likely contributes to its single-core lead.

Memory support is another major differentiator. The i5-7640X supports quad-channel DDR4, a hallmark of the HEDT (high-end desktop) platform, whereas the i3-10305 uses dual-channel DDR4. However, the database records a memory bandwidth figure of 42.7 GB/s for the i3-10305, while no bandwidth number is listed for the i5-7640X. The quad-channel capability of the i5-7640X is theoretically broader, but without a recorded bandwidth measurement, the practical impact remains unquantified in this dataset.

Integrated graphics separate the two as well. The i3-10305 includes Intel UHD Graphics 630, giving it a fallback display output without a discrete GPU. The i5-7640X has no integrated graphics listed, meaning it requires a separate graphics card for any video output. The i3-10305 also supports PCIe Gen 3 with 16 lanes from the CPU, while the i5-7640X lists PCIe Gen 3 without a lane count.

The i5-7640X does have one notable feature advantage: an unlocked multiplier. This allows overclocking, which the i3-10305 cannot do since its multiplier is locked. For users willing to manually tune clocks, the i5-7640X offers headroom that the i3-10305 lacks. However, the stock performance data shows the i3-10305 already ahead despite that limitation.

Power consumption differs sharply. The i3-10305 has a TDP of 65 watts, while the i5-7640X draws 112 watts. The i5-7640X consumes nearly twice the power budget, yet delivers lower performance in every benchmark. This inefficiency is a notable point: the older HEDT part requires more power to do less work.

The Verdict

The data points to a clear winner for most users: the Intel Core i3-10305. It wins all six head-to-head Cinebench tests by roughly 30%, offers double the thread count, includes integrated graphics, consumes less power, and has a higher boost clock. The only recorded advantages for the i5-7640X are its unlocked multiplier, quad-channel memory support, and a slightly higher base clock. None of those translate into a benchmark victory in this dataset.

The i5-7640X’s quad-channel memory is a theoretical benefit, but the database shows no bandwidth figure to confirm its real-world effect. The unlocked multiplier could appeal to overclockers seeking to push beyond stock clocks, though the stock results already place it behind. For a user building a new system, the i3-10305’s Socket 1200 platform is more modern and its 65-watt TDP is far easier to cool than the 112-watt i5-7640X.

The i5-7640X makes sense only in a narrow scenario: if a user already owns a Socket 2066 motherboard and values overclocking, or needs quad-channel memory for a specific application. Outside of those cases, the benchmark evidence overwhelmingly favors the i3-10305. Its 47th percentile standing matches the i5-7640X, but its actual scores are higher across the board. The i3-10305 is the better performing, more efficient, and more feature-complete processor according to the recorded data.

Specification Differences

The two processors differ in several key specification fields. The i3-10305 has 4 cores and 8 threads, while the i5-7640X has 4 cores and 4 threads. Base clocks are 3.80 GHz versus 3.90 GHz respectively, but boost clocks favor the i3-10305 at 4.50 GHz against 4.30 GHz. TDP is a major split: 65 watts for the i3-10305, 112 watts for the i5-7640X.

Sockets differ completely: Intel Socket 1200 for the i3-10305, Intel Socket 2066 for the i5-7640X. The architectures are Comet Lake (Comet Lake-R codename) versus Kaby Lake (Kaby Lake-X codename). L3 cache is 8 MB shared on the i3-10305 versus 6 MB shared on the i5-7640X. Memory bus width is dual-channel for the i3-10305 and quad-channel for the i5-7640X. The i3-10305 records a memory bandwidth of 42.7 GB/s, while the i5-7640X has none listed.

The i3-10305 includes Intel UHD Graphics 630; the i5-7640X has no integrated graphics. The i3-10305’s multiplier is locked, while the i5-7640X’s is unlocked. PCIe support is Gen 3 with 16 CPU lanes for the i3-10305, versus Gen 3 with no lane count for the i5-7640X. Release dates are also far apart: March 2021 for the i3-10305, June 2017 for the i5-7640X.

FAQ

Q: Which processor is faster in multi-core workloads?

A: The Intel Core i3-10305 wins every multi-core test. In Cinebench R23 multi-core, it scores 7828 versus 6031 for the i5-7640X, a 29.8% advantage. The R20 multi-core result is 3287 versus 2533, and R15 multi-core is 788 versus 607.

Q: Does the i5-7640X win any benchmark?

A: No. The head-to-head data shows 6 wins for the i3-10305 and 0 wins for the i5-7640X across all Cinebench tests.

Q: How do their thread counts compare?

A: The i3-10305 has 8 threads from 4 cores, while the i5-7640X has 4 threads from 4 cores. The i3-10305 supports simultaneous multithreading, the i5-7640X does not.

Q: What is the power draw difference?

A: The i3-10305 has a TDP of 65 watts, while the i5-7640X has a TDP of 112 watts. The i3-10305 delivers higher performance while consuming less power.

Q: Can either processor use integrated graphics?

A: Only the i3-10305 includes integrated graphics, specifically Intel UHD Graphics 630. The i5-7640X has no integrated graphics listed.

Q: Which processor supports overclocking?

A: The i5-7640X has an unlocked multiplier, allowing overclocking. The i3-10305 has a locked multiplier and does not support it.

Where Each One Wins

The Intel Core i3-10305 is the pick for nearly every scenario indicated by the data. It wins all six Cinebench tests, including both single-core and multi-core variants. Its 8 threads make it better suited for multitasking and threaded applications, as evidenced by the 29.8% multi-core lead in R15, R20, and R23. The integrated UHD Graphics 630 provides a display output without a discrete GPU, simplifying basic builds. Its 65-watt TDP is easier to cool and less demanding on power delivery. The higher boost clock of 4.50 GHz contributes to its single-core wins, which range from 29.8% to 30.6% over the i5-7640X.

The Intel Core i5-7640X has a narrower set of advantages, none of which show up in the benchmark results. Its unlocked multiplier appeals to overclockers who want to manually tune clocks beyond stock. The quad-channel memory bus offers broader memory bandwidth potential, though no bandwidth figure is recorded in the database. The slightly higher base clock of 3.90 GHz is its only clock-speed advantage, but the boost clock falls behind. The Socket 2066 platform may be relevant to users with existing HEDT motherboards. For anyone building fresh or upgrading from a locked platform, the i5-7640X offers no benchmark-based reason to choose it over the i3-10305.

The average scores place both at the 47th percentile, but the i3-10305’s 2264 average exceeds the i5-7640X’s 2167. The i3-10305 also sits closer to stronger rivals like the i7-1068NG7 (0.2% behind) and i5-9400 (0.4% behind), while the i5-7640X’s nearest rivals include the i5-1145G7E and Ryzen 5 3400GE, both slightly ahead. The data suggests the i3-10305 is the more competitive part in its segment. The i5-7640X’s only justifications are platform-specific: quad-channel memory, overclocking headroom, and compatibility with Socket 2066 boards. For general workloads, the i3-10305 is the definitive winner.