Intel Core i5-5300U vs Intel Core i7-860 Comparison

The Intel Core i5-5300U and Intel Core i7-860 are both end-of-life processors, but they represent two very different eras of Intel design. The i5-5300U is a 2015 mobile chip built for efficiency, while the i7-860 is a 2009 desktop quad-core designed for raw throughput. The benchmark data shows a clear, consistent winner across all recorded tests, but the reasons behind that victory are rooted in architectural trade-offs that matter for different use cases.

Head-to-Head Benchmarks

The head-to-head results are unambiguous: the Intel Core i7-860 wins all five recorded benchmark comparisons. In Cinebench R15 multi-core, the i7-860 scores 259 against the i5-5300U's 230, a delta of -11.2% from the perspective of the i5-5300U. The pattern holds in Cinebench R20 multi-core, where the i7-860 posts 1081 versus 960, again an -11.2% difference. The single-core tests tell the same story: in Cinebench R20 single-core, the i7-860 leads 152 to 135, and in Cinebench R23 single-core, it leads 363 to 322, a -11.3% gap. The largest absolute margin appears in Cinebench R23 multi-core, where the i7-860 scores 2574 against 2287, a -11.1% difference.

What is notable is the consistency of the margin. Every recorded benchmark shows the i7-860 ahead by roughly 11%, regardless of whether the workload is single-threaded or multi-threaded. This suggests the i7-860's advantage is not merely a matter of having more cores; its per-core performance is also superior in these tests. The i5-5300U wins zero head-to-head comparisons, while the i7-860 wins all five.

For context, the average benchmark score for the i5-5300U is 895, placing it in the 24th percentile of all CPUs. The i7-860 averages 886, also in the 24th percentile. Despite the i7-860 winning every direct comparison, the two chips land at nearly the same overall percentile, which reflects how the database aggregates results across many different workloads. The i5-5300U's nearest rivals include the Intel Pentium G4600T and AMD PRO A10-8770E, both with an average score of 895 and a 0% delta. The i7-860's nearest rivals include the AMD PRO A8-8650B and Intel Pentium G4560T, both at 887 with a -0.1% delta.

Architecture Differences

The two chips come from fundamentally different design philosophies. The i5-5300U is built on the Broadwell architecture, specifically the Broadwell-U codename, using a 14 nm process node. It integrates 1,300 million transistors on an 82 mm² die. The i7-860 is a Nehalem part, codenamed Lynnfield, fabricated on a 45 nm process with 774 million transistors on a much larger 296 mm² die. The smaller process node gives the i5-5300U a significant efficiency advantage, but the older Nehalem design compensates with a more power-hungry layout.

Core and thread counts differ sharply. The i5-5300U offers 2 cores and 4 threads, while the i7-860 provides 4 cores and 8 threads. This doubling of resources is a primary driver of the i7-860's multi-core wins. Cache configurations also diverge: both share 64 KB of L1 and 256 KB of L2 per core, but the i5-5300U has 3 MB of shared L3, whereas the i7-860 has 8 MB of shared L3. The larger L3 cache on the i7-860 likely helps in workloads that repeatedly access the same data.

Clock speeds favor the i7-860 as well. Its base clock is 2.80 GHz with a boost of 3.47 GHz, compared to the i5-5300U's 2.30 GHz base and 2.90 GHz boost. The i7-860's higher clocks, combined with more cores and more cache, explain why it wins even the single-core tests despite the newer architecture of the i5-5300U. The i5-5300U does include integrated graphics (Intel HD 5500), while the i7-860 has none, and the i5-5300U supports PCIe Gen 2 with 12 lanes versus the i7-860's 16 lanes.

FAQ

Q: Which processor has a higher boost clock?

A: The Intel Core i7-860 has a boost clock of 3.47 GHz, while the Intel Core i5-5300U boosts to 2.90 GHz.

Q: How much larger is the L3 cache on the i7-860?

A: The i7-860 has 8 MB of shared L3 cache, compared to 3 MB on the i5-5300U.

Q: Does the i5-5300U have integrated graphics?

A: Yes, the i5-5300U includes Intel HD 5500 integrated graphics. The i7-860 has no integrated graphics.

Q: What is the TDP difference between the two?

A: The i5-5300U has a TDP of 15 watts, while the i7-860 has a TDP of 95 watts.

Q: Which chip supports more PCIe lanes?

A: The i7-860 supports 16 PCIe Gen 2 lanes (CPU only), while the i5-5300U supports 12 lanes.

Q: Are both processors end-of-life?

A: Yes, both the i5-5300U and the i7-860 are marked as end-of-life production status.

Specification Differences

The two processors differ in nearly every major specification. The i5-5300U has 2 cores and 4 threads, whereas the i7-860 has 4 cores and 8 threads. Base clocks are 2.30 GHz for the i5-5300U and 2.80 GHz for the i7-860; boost clocks are 2.90 GHz and 3.47 GHz respectively. TDP is a major split: 15 watts for the i5-5300U versus 95 watts for the i7-860.

Sockets are incompatible: the i5-5300U uses Intel BGA 1168, while the i7-860 uses Intel Socket 1156. The architecture and process node differ completely, with the i5-5300U on Broadwell at 14 nm and the i7-860 on Nehalem at 45 nm. Transistor counts are 1,300 million versus 774 million, and die sizes are 82 mm² versus 296 mm². L3 cache is 3 MB on the i5-5300U and 8 MB on the i7-860.

Memory support is DDR3 for both, and both use a dual-channel memory bus. Memory bandwidth is listed at 25.6 GB/s for the i5-5300U, with no figure recorded for the i7-860. Neither supports ECC memory. The i5-5300U has integrated graphics (Intel HD 5500), while the i7-860 has none. PCIe support is Gen 2 on both, but with different lane counts: 12 lanes for the i5-5300U and 16 lanes for the i7-860. The market segments differ as well: the i5-5300U is mobile, and the i7-860 is desktop. Release dates are years apart, with the i5-5300U launching in 2015 and the i7-860 in 2009. The i5-5300U carries a launch MSRP of $315; no launch MSRP is recorded for the i7-860.

Where Each One Wins

The Intel Core i7-860 wins every recorded benchmark, so on raw performance, it is the clear choice for compute-heavy tasks. Its 4 cores and 8 threads, higher clocks, and larger 8 MB L3 cache make it consistently about 11% faster in both single-core and multi-core Cinebench tests. For workloads like video rendering, compilation, or any multi-threaded application that can use more than four threads, the data shows the i7-860 will finish the job measurably sooner.

The Intel Core i5-5300U, despite losing all direct comparisons, has its own strengths that the benchmark scores do not capture. Its 15 watt TDP is dramatically lower than the i7-860's 95 watts, making it suitable for compact, fanless, or battery-powered mobile systems where heat and power draw are the primary constraints. It also includes integrated graphics, so a system built around it does not require a separate GPU for basic display output. The smaller 14 nm process and 82 mm² die mean it generates far less heat, which is critical in a laptop chassis.

In terms of platform flexibility, the i7-860 offers more PCIe lanes (16 versus 12), which could matter for systems with multiple expansion cards, but this is a desktop-only part with no integrated GPU, so a discrete graphics card is mandatory. The i5-5300U, being mobile, is not designed for such expansion.

The Verdict

The choice between these two processors depends entirely on the use case, and the data points in opposite directions. If the goal is maximum processing speed for desktop workloads, the Intel Core i7-860 is the winner. It outperforms the i5-5300U by roughly 11% across all tested Cinebench scenarios, offers double the cores and threads, and has a larger cache. A builder with access to a Socket 1156 motherboard and a discrete GPU should pick the i7-860 without hesitation.

If the goal is a low-power mobile system, the Intel Core i5-5300U is the only sensible option. Its 15 watt TDP is 80 watts lower than the i7-860, it includes integrated graphics, and it is physically designed for a BGA 1168 laptop socket. The i7-860 cannot be used in such a form factor at all.

For anyone comparing these strictly on benchmark scores, the i7-860 wins. But the i5-5300U exists in a different category: efficiency and portability. The recorded data shows the i7-860 is the faster chip, yet the i5-5300U is the only one of the two that can power a thin, quiet, battery-operated device. Neither is a modern powerhouse, as both sit at the 24th percentile of all CPUs, but each serves a distinct market segment that the other cannot fill.