Intel Core i5-6600 vs Intel Core i5-8269U Comparison

The Intel Core i5-8269U and Intel Core i5-6600 represent two distinct approaches to quad-core computing: a mobile-first, hyper-threaded part versus a desktop stalwart. The benchmark data shows a decisive performance advantage for the newer mobile chip across every single test, despite its lower thermal design power. This head-to-head is not about close competition; it is a demonstration of generational efficiency and architectural feature gains. The i5-8269U wins all six head-to-head benchmark comparisons, with an average benchmark score of 1748 compared to the i5-6600’s 1744, placing both in the 41st percentile of all CPUs.

Head-to-Head Benchmarks

The most striking pattern in the data is the consistency of the i5-8269U’s victory across all Cinebench workloads. The margins are remarkably uniform, hovering around 17% in every test. In the Cinebench R15 multicore test, the i5-8269U scores 609 against the i5-6600’s 520, a 17.1% advantage. This is not a single-threaded fluke; the single-core test shows the same story, with the i5-8269U scoring 85 versus 73, a 16.4% lead. The i5-8269U’s advantage is its ability to process eight threads simultaneously, while the i5-6600 is limited to four. This is the core differentiator in threaded workloads.

Moving to newer benchmarks, the advantage persists. In Cinebench R20, the i5-8269U scores 2538 in multicore and 358 in single-core, while the i5-6600 scores 2167 and 305, respectively. The deltaPct values are 17.1% and 17.4%, showing that the performance gap does not close with newer test versions. The Cinebench R23 results confirm this trend: the i5-8269U’s 6044 multicore and 853 single-core scores beat the i5-6600’s 5161 and 728 by 17.1% and 17.2%. The i5-8269U’s higher boost clock of 4.20 GHz, compared to the i5-6600’s 3.90 GHz, likely contributes to the single-core wins.

The i5-6600 does have one data point the i5-8269U lacks: Geekbench scores. The i5-6600 posts 3755 in Geekbench multicore and 1239 in single-core. However, without a corresponding Geekbench score for the i5-8269U, this cannot be directly compared. The Cinebench results, which are available for both, tell a clear story. The i5-8269U is not just slightly ahead; it is consistently and significantly faster in every comparable test. The 17% advantage is a substantial generational leap, not a marginal improvement.

FAQ

Q: How much faster is the Intel Core i5-8269U than the Intel Core i5-6600 in multi-core workloads?

A: The i5-8269U is consistently about 17% faster in multi-core tests. In Cinebench R23 multicore, it scores 6044 versus 5161, a 17.1% advantage, and in Cinebench R15 multicore, it scores 609 versus 520, also a 17.1% lead.

Q: Does the i5-8269U have an advantage in single-core performance?

A: Yes, the i5-8269U wins all single-core comparisons. In Cinebench R20 single-core, it scores 358 versus 305, a 17.4% advantage. The i5-8269U’s boost clock of 4.20 GHz, compared to the i5-6600’s 3.90 GHz, supports this result.

Q: What is the primary architectural difference that explains the performance gap?

A: The i5-8269U supports Hyper-Threading, providing 8 threads across its 4 cores, while the i5-6600 has only 4 threads. This allows the i5-8269U to process more parallel work, which is the main driver of its multi-core score advantage.

Q: Are these CPUs in the same performance class according to the database?

A: The average benchmark scores are nearly identical, with the i5-8269U at 1748 and the i5-6600 at 1744. Both are ranked in the 41st percentile of all CPUs, and they are listed as nearest rivals to each other, with a deltaPct of 0.3% from the i5-8269U’s perspective.

Q: Which CPU has a higher thermal design power (TDP)?

A: The i5-6600 has a higher TDP of 35 watts, while the i5-8269U is rated at 28 watts. Despite the lower power envelope, the i5-8269U delivers significantly higher benchmark scores.

Q: Does the i5-6600 have any benchmark results that the i5-8269U does not?

A: Yes, the i5-6600 has Geekbench scores of 3755 for multicore and 1239 for single-core. The i5-8269U has no Geekbench results listed, so a direct comparison cannot be made.

Where Each One Wins

The Intel Core i5-8269U wins in every scenario where Cinebench performance is a proxy for real-world productivity. It is the clear choice for users who prioritize multi-threaded applications, such as video editing, 3D rendering, and software compilation. The 17% advantage in Cinebench R23 multicore (6044 vs 5161) directly translates to faster completion times for these tasks. Its single-core wins (853 vs 728 in R23) also make it better for responsive, lightly-threaded applications like web browsing and office productivity. The i5-8269U achieves all this within a 28-watt TDP, making it suitable for compact mobile systems where heat and power are constrained.

The Intel Core i5-6600 has no benchmark wins in this comparison. Its only potential advantage lies in its platform. It is a desktop processor on the Intel Socket 1151, which is a standard platform for full-sized systems. This means it can be paired with a wider range of motherboards and memory configurations, including support for DDR3 and DDR4 memory. However, from a pure performance standpoint, the data shows it is the slower CPU in every test. Its end-of-life production status and lower thread count make it a less attractive option for new builds. The i5-6600’s higher TDP of 35 watts also means it requires more cooling, which is not a problem in a desktop but is a drawback compared to the i5-8269U’s efficiency.

Specification Differences

The two processors differ in nearly every core specification. The i5-8269U has 4 cores and 8 threads, while the i5-6600 has 4 cores and 4 threads. This is the most critical difference, as it doubles the logical processing capacity of the mobile chip. The base clocks are reversed in magnitude: the i5-6600 has a higher base clock of 3.30 GHz, while the i5-8269U has a lower base clock of 2.60 GHz. However, the boost clocks tell a different story, with the i5-8269U reaching 4.20 GHz versus the i5-6600’s 3.90 GHz.

The thermal design power differs significantly. The i5-8269U is rated at 28 watts, while the i5-6600 is rated at 35 watts. This makes the i5-8269U more power-efficient, which is a key consideration for mobile devices. The sockets are also incompatible: the i5-8269U uses Intel BGA 1356 for mobile integration, while the i5-6600 uses Intel Socket 1151 for desktop motherboards. The integrated graphics differ, with the i5-8269U featuring Iris Pro Plus and the i5-6600 featuring UHD Graphics 530. Memory support is also different; the i5-8269U supports DDR4, while the i5-6600 supports both DDR3 and DDR4. Finally, the i5-8269U is listed as Active production, while the i5-6600 is End-of-life.

Architecture Differences

The architectural divide is clear: the i5-8269U is based on Kaby Lake (specifically the Kaby Lake-R refresh), while the i5-6600 is based on the older Skylake architecture. Both use the same 14 nm process node from Intel, but the newer Kaby Lake design incorporates refinements that yield higher performance at lower power. The die size also differs, with the i5-8269U measuring 123 mm² compared to the i5-6600’s 177 mm². This smaller die size, combined with the 28-watt TDP, indicates a more power-efficient design.

The cache hierarchy is identical in structure and size. Both have 64 KB of L1 cache per core, 256 KB of L2 cache per core, and a shared 6 MB L3 cache. Despite this, the performance difference is substantial, highlighting that the efficiency gains come from the core architecture and the addition of Hyper-Threading in the i5-8269U. The i5-8269U’s release date is later (April 2018) compared to the i5-6600 (June 2015), and the market segment is Mobile versus Desktop. The i5-8269U also lacks a launch MSRP, while the i5-6600 has one of $224. The i5-8269U’s smaller die and newer architecture allow it to offer superior performance in a fraction of the power envelope.