Intel Core i5-8265U vs Intel Core i7-8650U Comparison

Head-to-Head Benchmarks

The benchmark data presents a remarkably one-sided picture. The Intel Core i7-8650U wins all 17 recorded head-to-head comparisons, with zero victories for the Intel Core i5-8265U. The most dramatic gaps appear in Cinebench workloads, where the i7-8650U consistently leads by roughly 17% across every version of the test. In Cinebench R15 multi-core, the i7-8650U scores 529 versus 451 for the i5-8265U, a 17.3% advantage. Single-core R15 shows a similar pattern: 74 versus 63, a 17.5% lead. The R20 and R23 results mirror this exactly, with deltas of 17.2% to 17.4% across both multi-core and single-core runs. This consistency suggests the performance gap is structural rather than workload-specific.

The Passmark suite tells a more nuanced story. The i7-8650U still wins every test, but the margins shrink considerably in some areas. Floating point math shows only a 2.6% delta (13299 versus 12963), while integer math is even closer at 2.1% (22007 versus 21560). Data compression sits at 3.8% (78936 versus 76049), and random string sorting at 3.6% (10485 versus 10117). The largest Passmark gap appears in the prime number search test, where the i7-8650U scores 22 against 18, a 22.2% delta. That outlier stands out against the otherwise modest Passmark advantages.

Physics simulation shows a substantial 16.5% lead for the i7-8650U (472 versus 405), which aligns more closely with the Cinebench multi-core results than with the other Passmark tests. Multithread performance sits at 6.1% (6193 versus 5838), while data encryption shows 5.4% (2067 versus 1961). Extended instructions land at 2.8% (5042 versus 4904). The single-thread Passmark scores are nearly identical: 2103 versus 2030, a 3.6% delta. What the data implies is that the i7-8650U's advantage is most pronounced in sustained multi-core rendering workloads, while everyday math operations see only marginal gains.

FAQ

Q: Does the Core i7-8650U beat the Core i5-8265U in every benchmark?

A: Yes. The recorded data shows 17 wins for the i7-8650U and 0 wins for the i5-8265U across all Cinebench and Passmark tests.

Q: How large is the performance gap in multi-core workloads?

A: The Cinebench R15, R20, and R23 multi-core tests all show the i7-8650U leading by 17.2% to 17.3%. The Passmark multithread test shows a smaller 6.1% advantage.

Q: Are the single-core differences similar to the multi-core differences?

A: No. Cinebench single-core tests show a 17.2% to 17.5% lead for the i7-8650U, but Passmark single-thread tests show only a 3.6% difference (2103 versus 2030).

Q: Which processor has the higher average benchmark score?

A: The i7-8650U has an average benchmark score of 8932, while the i5-8265U scores 8568. The i7-8650U also sits at the 65th percentile of all CPUs, compared to the 64th percentile for the i5-8265U.

Q: What is the closest rival to each processor in the database?

A: The i7-8650U's nearest rival is the Intel Xeon Gold 6330, with an average score of 8939, just 0.1% higher. The i5-8265U's nearest rival is the Intel Core i5-8250U at 8577, also 0.1% higher.

Q: Is there any workload where the i5-8265U comes close to matching the i7-8650U?

A: The closest margins are in Passmark integer math (2.1% gap) and floating point math (2.6% gap). These are the smallest deltas recorded, though the i5-8265U still loses both.

Architecture Differences

The two processors belong to different architectural generations despite sharing the same 14 nm process node. The i7-8650U is built on Kaby Lake-R, while the i5-8265U uses Whiskey Lake-U. Both are quad-core, eight-thread designs from Intel, but the underlying implementation differs. The i7-8650U uses the Intel BGA 1356 socket, while the i5-8265U uses Intel BGA 1528, indicating a physical package change between generations.

Cache configuration presents a clear distinction. The i7-8650U carries 8 MB of shared L3 cache, compared to 6 MB on the i5-8265U. This 2 MB difference is significant for workloads that benefit from larger working sets. Both processors have identical per-core L1 (64 KB) and L2 (256 KB) caches. The i7-8650U's die size is recorded at 123 mm², while the i5-8265U has no die size listed in the database.

Clock speeds favor the i7-8650U in both base and boost operation. The i7-8650U runs at 1900 MHz base and 4200 MHz boost, while the i5-8265U runs at 1600 MHz base and 3900 MHz boost. The 300 MHz base clock and 300 MHz boost clock advantages for the i7-8650U help explain the consistent Cinebench leads. Both processors have a 15 W TDP, making them comparable in power envelope.

Memory support is listed as DDR4 for both, but the i5-8265U includes additional specification details: dual-channel memory bus and 38.4 GB/s memory bandwidth. The i7-8650U does not have these fields populated. Both processors integrate UHD 620 graphics (listed as UHD 620 for the i7-8650U and UHD Graphics 620 for the i5-8265U). Neither supports ECC memory, and both have locked multipliers. The i5-8265U lists PCIe Gen 3 with 16 lanes (CPU only), while the i7-8650U has no PCIe data recorded.

Production status differs notably. The i7-8650U is marked as active, while the i5-8265U is end-of-life. Release dates place the i7-8650U in August 2017 and the i5-8265U in September 2018, making the i5 the newer design. The i5-8265U has a recorded launch MSRP of $297, while the i7-8650U has no launch price in the database.

The Verdict

The data supports a clear hierarchy: the i7-8650U outperforms the i5-8265U across every measured workload. The 17.2% to 17.5% Cinebench deltas indicate a substantial advantage in rendering and heavily threaded scenarios, while the smaller Passmark gaps (2.1% to 6.1%) show more modest gains in general computing tasks. The i7-8650U's higher base and boost clocks, combined with the larger 8 MB L3 cache, provide a structural explanation for the consistent lead.

Buyers should choose the i7-8650U if rendering performance, physics simulation, or multithreaded productivity is the priority. The prime number test's 22.2% delta also suggests an edge in integer-heavy algorithmic workloads. The i5-8265U, despite being a newer design, cannot overcome the clock speed and cache deficit. Its only advantages are a recorded launch MSRP of $297 and a newer release date, but neither translates into benchmark wins.

The percentile rankings reinforce this: the i7-8650U sits at the 65th percentile of all CPUs, versus the 64th percentile for the i5-8265U. The average benchmark scores (8932 versus 8568) show a 364-point gap, roughly 4.2% in favor of the i7-8650U. Given that the i5-8265U is end-of-life and the i7-8650U remains active, the i7 is the more future-proof choice from the data alone.

Specification Differences

| Specification | Intel Core i7-8650U | Intel Core i5-8265U |

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

| Base clock | 1900 MHz | 1600 MHz |

| Boost clock | 4200 MHz | 3900 MHz |

| Socket | Intel BGA 1356 | Intel BGA 1528 |

| Architecture | Kaby Lake | Whiskey Lake |

| Codename | Kaby Lake-R | Whiskey Lake-U |

| Generation | Core i7 (Kaby Lake-U Refresh) | Core i5 (Whiskey Lake) |

| L3 cache | 8 MB (shared) | 6 MB (shared) |

| Die size | 123 mm² | Not listed |

| Memory bus | Not listed | Dual-channel |

| Memory bandwidth | Not listed | 38.4 GB/s |

| PCIe | Not listed | Gen 3, 16 Lanes (CPU only) |

| Integrated graphics | UHD 620 | UHD Graphics 620 |

| Production status | Active | End-of-life |

| Release date | 2017-08-20 | 2018-09-30 |

| Launch MSRP | Not listed | $297 |

| Part number | SR3L8 | SRFFXSREJQSREJR |

Where Each One Wins

The i7-8650U wins decisively in rendering workloads. Cinebench R15, R20, and R23 all show the same 17.2% to 17.5% advantage, making this the strongest category for the i7. Physics simulation follows at 16.5%, indicating solid performance in physics-based applications. The prime number test shows the largest single delta at 22.2%, pointing to an edge in certain algorithmic and number-crunching tasks. Data encryption (5.4%) and multithread (6.1%) round out the mid-tier advantages.

The i5-8265U does not win any recorded benchmark. However, the data reveals areas where it comes closest to matching the i7-8650U. Integer math shows just a 2.1% gap, and floating point math is close at 2.6%. Extended instructions (2.8%), single-thread Passmark (3.6%), random string sorting (3.6%), and data compression (3.8%) all fall in the narrow 2% to 4% range. These are the workloads where the i5-8265U's Whiskey Lake architecture nearly closes the gap.

For practical purposes, the i5-8265U remains a competent processor for everyday tasks like spreadsheet calculations, document processing, and light data manipulation, based on the small deltas in integer and floating point math. The i7-8650U pulls away decisively when the workload becomes more demanding, particularly in multi-core rendering, physics simulation, and prime number searching. The data implies that users who frequently run Cinebench-class workloads will notice the difference, while those engaged in basic office tasks may find the two processors functionally similar despite the i7's consistent benchmark lead.