Intel Core i5-1135G7 vs Intel Core i7-8565U Comparison

Head-to-Head Benchmarks

The benchmark data is unambiguous: the Intel Core i5-1135G7 wins every single recorded head-to-head comparison against the Intel Core i7-8565U, with 17 wins and zero losses. This is not a close contest; the newer Tiger Lake part dominates across every workload category measured.

The largest gap appears in data encryption. The i5-1135G7 scores 5,465 in PassMark data encryption, while the i7-8565U manages only 1,993. That is a 174.2% advantage, by far the biggest delta in this matchup. Encryption workloads often rely on newer instruction sets and memory access patterns, and the results show a generational leap rather than a small iteration.

Multi-threaded performance tells a similar story. In PassMark multithread, the i5-1135G7 scores 9,512 versus 5,988 for the i7-8565U, a 58.9% lead. Cinebench R23 multicore shows 7,909 versus 5,258, a 50.4% advantage. The pattern repeats in Cinebench R20 multicore: 3,321 against 2,208, again a 50.4% delta. These are consistent, large margins that point to a fundamentally more capable core design.

Single-threaded results are closer but still favor the newer chip. PassMark single-thread shows 2,640 versus 2,118, a 24.6% lead. Cinebench R23 single-core gives 1,116 versus 742, a 50.4% gap. Cinebench R20 single-core: 468 versus 311, a 50.5% delta. Even in the least favorable comparison, the i5-1135G7 remains ahead by roughly a quarter.

The remaining benchmarks all follow the same direction. PassMark integer math: 31,814 versus 21,581, a 47.4% lead. Floating-point math: 19,221 versus 12,934, a 48.6% advantage. Extended instructions: 7,406 versus 4,770, a 55.3% gap. Data compression: 103,380 versus 75,995, a 36% lead. Prime number finding: 34 versus 22, a 54.5% advantage. Physics: 577 versus 458, a 26% lead. Random string sorting: 12,625 versus 10,200, a 23.8% edge.

The 3DMark results only exist for the i5-1135G7 in this database, so no direct comparison is possible there. But the included scores (2,595 for 16 threads, 1,348 for 2 threads, 1,995 for 4 threads, 2,475 for 8 threads, 2,713 for max threads, and 801 for single thread) indicate the chip scales well with thread count, which matters for gaming and graphics-adjacent workloads.

Architecture Differences

The two processors come from different architectural eras. The i5-1135G7 uses Tiger Lake-U on Intel's 10 nm process, while the i7-8565U is a Whiskey Lake-U part built on 14 nm. This process node difference is a primary driver of the performance gap, as the newer node allows higher efficiency and more complex cores.

The cache layouts differ substantially. The i5-1135G7 has 80 KB of L1 per core and 1.25 MB of L2 per core, with 8 MB of shared L3. The i7-8565U has 64 KB of L1 per core and 256 KB of L2 per core, also with 8 MB of shared L3. The L2 advantage for the Tiger Lake part is significant: 1.25 MB versus 256 KB per core is a 5x difference in that cache level. This helps explain the large wins in integer math and encryption, which are often cache-sensitive.

Memory support also diverges. The i5-1135G7 supports DDR4 and LPDDR4X, while the i7-8565U supports DDR3 and DDR4. The i7-8565U has a listed memory bandwidth of 38.4 GB/s; the i5-1135G7 has no bandwidth figure recorded, but its LPDDR4X support suggests newer memory technology.

PCIe generations differ as well. The i5-1135G7 has Gen 4 with 4 lanes (CPU only), while the i7-8565U has Gen 3 with 16 lanes. This means the newer chip offers faster per-lane bandwidth, though fewer lanes, which matters for storage and GPU connectivity decisions.

Integrated graphics are in different leagues. The i5-1135G7 ships with Iris Xe Graphics G7 with 80 execution units. The i7-8565U has UHD Graphics 620, an older and less capable design. While no graphics benchmarks are in the head-to-head data, the architectural difference is clear from the specifications.

Sockets differ too: the i5-1135G7 uses Intel BGA 1449, while the i7-8565U uses Intel BGA 1528. These are not interchangeable, so platform compatibility is a hard constraint when choosing between them.

Where Each One Wins

The i5-1135G7 wins every recorded benchmark category. There is no workload in the data where the i7-8565U comes out ahead. The strongest i7-8565U showings are in PassMark physics and random string sorting, where it trails by 26% and 23.8% respectively. These are the smallest deltas, suggesting the older chip is least disadvantaged in workloads that rely more on memory bandwidth than raw core throughput.

For encryption-heavy tasks, the i5-1135G7 is the clear choice. The 174.2% advantage in data encryption is the single largest margin, so any workload involving AES or similar encryption will see massive gains. The extended instructions benchmark (55.3% lead) also points to better support for modern instruction sets.

For multi-threaded productivity, the i5-1135G7 delivers consistent 50% or better advantages across Cinebench R15, R20, and R23 multicore tests. PassMark multithread shows a 58.9% lead. This makes the newer chip the pick for rendering, video encoding, and compilation tasks.

For single-thread responsiveness, the i5-1135G7 still leads by 24.6% in PassMark and around 50% in Cinebench single-core tests. Daily desktop use, web browsing, and office applications will feel snappier on the Tiger Lake part.

The i7-8565U does offer a higher boost clock (4.60 GHz versus 4.20 GHz) and a higher base clock (1.80 GHz versus 1.50 GHz), but the recorded benchmarks show these clock advantages do not translate into performance wins. The architectural improvements in the i5-1135G7 more than compensate for the lower clock rates.

Specification Differences

| Specification | Intel Core i5-1135G7 | Intel Core i7-8565U |

|---|---|---|

| Base Clock | 1.50 GHz | 1.80 GHz |

| Boost Clock | 4.20 GHz | 4.60 GHz |

| Process Node | 10 nm | 14 nm |

| L1 Cache | 80 KB (per core) | 64 KB (per core) |

| L2 Cache | 1.25 MB (per core) | 256 KB (per core) |

| Socket | Intel BGA 1449 | Intel BGA 1528 |

| Memory Support | DDR4, LPDDR4X | DDR3, DDR4 |

| Memory Bandwidth | Not recorded | 38.4 GB/s |

| PCIe | Gen 4, 4 Lanes | Gen 3, 16 Lanes |

| Integrated Graphics | Iris Xe Graphics G7 80EU | UHD Graphics 620 |

| Release Date | 2020-09-01 | 2018-09-30 |

| Launch MSRP | $309 | $409 |

| Part Number | SRK05 | SREJPSRFFW |

The table above shows only the fields where the two differ. Both have 4 cores, 8 threads, 15 W TDP, 8 MB shared L3, dual-channel memory, no ECC support, and no unlocked multiplier. Both are mobile parts and end-of-life production status.

FAQ

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

A: The i5-1135G7 wins all multi-core tests. In Cinebench R23 multicore it scores 7,909 versus 5,258, a 50.4% lead. PassMark multithread shows 9,512 versus 5,988, a 58.9% advantage.

Q: Is the i7-8565U better at anything?

A: The recorded data shows no benchmark where the i7-8565U wins. It has higher base and boost clocks, but these do not translate into any performance victory in the 17 head-to-head comparisons.

Q: How big is the gap in single-thread performance?

A: The i5-1135G7 leads by 24.6% in PassMark single-thread (2,640 versus 2,118) and by 50.4% in Cinebench R23 single-core (1,116 versus 742).

Q: What about encryption performance?

A: The i5-1135G7 is dramatically faster. It scores 5,465 in PassMark data encryption versus 1,993 for the i7-8565U, a 174.2% advantage.

Q: Do they use the same socket?

A: No. The i5-1135G7 uses Intel BGA 1449, and the i7-8565U uses Intel BGA 1528. They are not compatible with the same motherboards.

Q: Which has better integrated graphics?

A: The i5-1135G7 has Iris Xe Graphics G7 with 80 execution units, while the i7-8565U has UHD Graphics 620. The newer Iris Xe design is a different class of integrated GPU.

The Verdict

The data makes this decision straightforward. The i5-1135G7 outperforms the i7-8565U in every measured benchmark, often by large margins. For multi-threaded workloads, expect roughly 50% higher scores in Cinebench tests. For single-thread tasks, the advantage ranges from 24.6% to 50.4% depending on the test. For encryption, the newer chip is over 2.7x faster.

The i7-8565U's higher clock speeds (4.60 GHz boost versus 4.20 GHz) do not compensate for the architectural advantages of Tiger Lake. The i5-1135G7's larger L2 cache (1.25 MB versus 256 KB per core), newer 10 nm process, and PCIe Gen 4 support all contribute to its dominance.

Choose the i5-1135G7 if you need the best performance for any workload, especially encryption, multi-threaded rendering, or modern instruction set support. Its integrated graphics are also substantially better on paper, with 80 execution units versus the older UHD 620 design.

Choose the i7-8565U only if you have a specific platform requirement that forces the older BGA 1528 socket, or if you need DDR3 memory support. For raw performance, the recorded data shows no reason to prefer the older chip. The i5-1135G7 also launched at a lower MSRP ($309 versus $409), though both are end-of-life parts now.

The percentile rankings confirm the broader picture: both chips sit at the 65th percentile among all CPUs, but the i5-1135G7 has a higher average benchmark score of 9,053 versus 8,665 for the i7-8565U. The nearest rival data for the i5-1135G7 includes the i5-8350U (0.6% behind) and i7-8650U (1.4% behind), while the i7-8565U sits close to the i5-8365U (0.5% behind) and i7-10510U (1% behind). The newer part is simply the stronger processor in this comparison.