Intel Core i3-N305 vs Intel Core i5-7600K Comparison

The Intel Core i3-N305 and Intel Core i5-7600K represent two distinct approaches to processor design, separated by six years of architectural evolution. The data shows they land at nearly identical average benchmark scores—1979 for the i3-N305 and 1976 for the i5-7600K, a delta of just 0.1%—yet they achieve this parity through completely different means. The i3-N305 is a 15-watt mobile part with 8 Gracemont efficiency cores, while the i5-7600K is a 91-watt desktop chip with 4 Kaby Lake performance cores. Their head-to-head results reveal a fascinating split: the i3-N305 dominates in five of eight benchmarks, but the i5-7600K wins the two most modern workloads decisively.

Head-to-Head Benchmarks

The most striking result in the comparison is the Cinebench R15 single-core test, where the i3-N305 scores 164.7 against the i5-7600K's 82. That is a 100.9% advantage—the i3-N305 is more than twice as fast in this legacy test. This pattern repeats across the older Cinebench suite. In R15 multi-core, the i3-N305 scores 829 versus 583, a 42.2% lead. In R20 multi-core, the margin is 3349 to 2432, a 37.7% advantage, and in R20 single-core, 472 to 343, a 37.6% lead. Even in Cinebench R23 single-core, the i3-N305 wins with 995 against 817, a 21.8% margin.

The i5-7600K fights back in the newer, more demanding workloads. In Cinebench R23 multi-core, it scores 5792 versus the i3-N305's 5092, a 12.1% advantage. The Geekbench results also favor the older chip. In Geekbench multi-core, the i5-7600K scores 4239 against 3881, an 8.4% lead. The single-core Geekbench gap is the largest of the i5-7600K's wins: 1522 versus 1049, a 31.1% margin. Overall, the i3-N305 wins five benchmarks, while the i5-7600K wins three.

The deltaPct values in the nearestRivals data place these two processors within a very tight cluster. The i3-N305's nearest rival is the i5-7600K itself, at a 0.1% delta, followed by the Intel Xeon E3-1245 v5 at 0.3%, the AMD Ryzen Embedded V1756B at -0.3%, and the Intel Core i5-8279U at -0.4%. The i5-7600K's list mirrors this, with the i3-N305 at -0.1%, the Xeon E3-1245 v5 at 0.2%, the Intel Core i7-10810U at 0.3%, and the AMD Ryzen 3 2300X at 0.4%. Both chips sit at the 44th percentile of all CPUs, reinforcing their statistical equivalence.

Where Each One Wins

The i3-N305's wins are concentrated in the Cinebench suite, particularly the older R15 and R20 iterations. Its decisive single-core performance in R15 and R20 suggests that its Gracemont cores handle short, lightly-threaded bursts exceptionally well. The 100.9% single-core R15 advantage is not a marginal improvement; it is a generational leap in efficiency-core design. For workloads that resemble those tests—short render tasks, legacy application benchmarks, or lightly-threaded productivity—the i3-N305 is clearly the stronger performer.

The i5-7600K's wins are in Geekbench and R23 multi-core. The 31.1% Geekbench single-core margin indicates that Kaby Lake's higher clock speeds—a 4.20 GHz boost against 3.80 GHz—translate into better raw integer and floating-point throughput in that benchmark's modern, speculative-execution-heavy workloads. Its 12.1% R23 multi-core win suggests that sustained, AVX-heavy rendering favors the 91-watt part's ability to maintain higher all-core frequencies without thermal throttling. The i5-7600K also has a dual-channel memory bus versus the i3-N305's single-channel, which likely contributes to its Geekbench multi-core advantage in memory-latency-sensitive tasks.

The split is clean: the i3-N305 wins where core count and efficiency matter most in short bursts, while the i5-7600K wins where sustained throughput and single-thread headroom under modern instruction sets are paramount. Neither chip is universally superior; the benchmark suite determines the outcome.

Architecture Differences

The fundamental architectural divergence begins with the core counts. The i3-N305 packs 8 Gracemont cores with 8 threads, while the i5-7600K has 4 Kaby Lake cores with 4 threads. The i3-N305's Gracemont architecture is designed for power efficiency, operating at a 15-watt TDP, whereas the i5-7600K's Kaby Lake design consumes 91 watts. This 76-watt gap explains the cooling and power delivery requirements—the i3-N305 uses Intel BGA 1264 (soldered, mobile), while the i5-7600K uses Intel Socket 1151 (desktop, replaceable).

The process nodes differ significantly: the i3-N305 is built on Intel's 10 nm process, while the i5-7600K uses 14 nm. The cache hierarchy is also distinct. The i3-N305 has 96 KB of L1 per core and 2 MB of L2 per module, while the i5-7600K has 64 KB of L1 per core and 256 KB of L2 per core. Both share 6 MB of L3, but the i3-N305's L3 is shared across 8 cores, whereas the i5-7600K's is shared across 4 cores, giving the older chip more L3 per core.

Memory support diverges as well. The i3-N305 supports both DDR4 and DDR5, but only in single-channel mode, with 38.4 GB/s bandwidth. The i5-7600K supports DDR4 only, but in dual-channel mode, also with 38.4 GB/s bandwidth. The PCIe lanes differ: the i3-N305 offers Gen 3 with 9 lanes, while the i5-7600K offers Gen 3 with 16 lanes. The integrated graphics are different—UHD Graphics 770 on the i3-N305 versus HD 630 on the i5-7600K. The i3-N305 also has an unlocked multiplier disabled (locked), while the i5-7600K has an unlocked multiplier for overclocking. Neither supports ECC memory.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Core i3-N305 has an average benchmark score of 1979, while the Intel Core i5-7600K scores 1976. The delta is 0.1% in favor of the i3-N305, making them statistically equivalent.

Q: Why does the i3-N305 win the Cinebench R15 single-core test by such a large margin?

A: The i3-N305 scores 164.7 versus 82 for the i5-7600K, a 100.9% advantage. This reflects the Gracemont core's efficiency in short, single-threaded bursts, which the older Kaby Lake core cannot match in this specific legacy workload.

Q: In which benchmark does the i5-7600K have its largest victory?

A: The i5-7600K wins Geekbench single-core by the widest margin, scoring 1522 against 1049 for the i3-N305, a 31.1% difference. This is its only win exceeding 10% in any benchmark.

Q: How do the core counts and TDPs compare?

A: The i3-N305 has 8 cores and 8 threads with a 15-watt TDP, while the i5-7600K has 4 cores and 4 threads with a 91-watt TDP. The i3-N305 uses a 10 nm process, while the i5-7600K uses 14 nm.

Q: What memory configurations do the two processors support?

A: The i3-N305 supports DDR4 and DDR5 in single-channel mode with 38.4 GB/s bandwidth. The i5-7600K supports DDR4 only in dual-channel mode with the same 38.4 GB/s bandwidth.

Q: Which processor is better for overclocking?

A: The i5-7600K has an unlocked multiplier (multiplierUnlocked is true), allowing overclocking. The i3-N305 has a locked multiplier (multiplierUnlocked is false), so it cannot be overclocked.

The Verdict

The data does not crown a single overall winner; it identifies two different tools for two different jobs. The i3-N305 is the choice for workloads that resemble the Cinebench R15/R20 suite, where it holds leads of 37.6% to 42.2% in multi-core and 37.6% to 100.9% in single-core. Its 8-core configuration and Gracemont architecture make it effective for short, parallel bursts and legacy applications. Its 15-watt TDP and mobile socket (Intel BGA 1264) also point toward fanless or low-power systems where energy efficiency is paramount.

The i5-7600K is the pick for sustained, modern rendering and Geekbench-style integer workloads. Its 12.1% R23 multi-core win and 31.1% Geekbench single-core win demonstrate that its higher boost clock (4.20 GHz) and dual-channel memory bus deliver superior performance where the workload can use them. Its 91-watt TDP and desktop socket (Intel Socket 1151) make it suitable for traditional tower systems with active cooling. The unlocked multiplier adds overclocking headroom that the i3-N305 cannot offer.

For a user prioritizing the highest raw throughput in current-generation render tests or speculative-execution-heavy benchmarks, the i5-7600K's wins in R23 multi-core and both Geekbench tests are decisive. For a user running legacy Cinebench versions or seeking the most efficient 8-core solution in a compact form factor, the i3-N305's five benchmark victories, including a doubled R15 single-core score, make it the obvious choice. The 44th percentile ranking for both chips confirms they are mid-pack performers, but their strengths lie in different arenas. Choose the i3-N305 for efficiency and legacy workload dominance; choose the i5-7600K for modern single-threaded and sustained multi-core performance.