Intel Core i7-8565U vs Intel Core i7-8650U Comparison

The Intel Core i7-8650U and Intel Core i7-8565U are two 15 W mobile processors aimed at ultraportable laptops, and on paper they appear nearly identical. However, the benchmark data reveals a distinct split: the i7-8650U (Kaby Lake-R) consistently wins in multi-threaded and compute-heavy workloads, while the i7-8565U (Whiskey Lake) edges ahead in single-threaded tasks. Both CPUs share the same 4-core, 8-thread configuration, 8 MB of L3 cache, and 14 nm process node, but their architectural generations and clock strategies lead to tangible performance differences. The i7-8650U wins 12 of the 17 head-to-head benchmark comparisons, while the i7-8565U takes 5, making the older Kaby Lake-R part the better choice for sustained productivity despite the newer Whiskey Lake silicon.

FAQ

Q: Which processor has a higher boost clock?

A: The Intel Core i7-8565U has a boost clock of 4.60 GHz, which is higher than the i7-8650U’s 4.20 GHz boost clock. This explains the i7-8565U’s lead in single-threaded benchmarks like PassMark single-thread (2118 vs 2103).

Q: Are the two CPUs identical in core and thread counts?

A: Yes, both the Intel Core i7-8650U and the Intel Core i7-8565U feature 4 cores and 8 threads, with identical L1 cache at 64 KB per core, L2 cache at 256 KB per core, and 8 MB of shared L3 cache.

Q: Which processor is better for data compression workloads?

A: The Intel Core i7-8650U leads in PassMark data compression with a score of 78936, compared to 75995 for the i7-8565U. This represents a 3.9% advantage for the i7-8650U, making it the stronger choice for file archiving or compression tasks.

Q: Do the two chips support the same memory types?

A: No, the i7-8650U supports only DDR4 memory, while the i7-8565U supports both DDR3 and DDR4. The i7-8565U also specifies dual-channel memory and a memory bandwidth of 38.4 GB/s, whereas the i7-8650U lists no memory bus or bandwidth details.

Q: What is the production status difference between the two?

A: The Intel Core i7-8650U is listed as "Active" in production, while the Intel Core i7-8565U is marked as "End-of-life." This suggests the i7-8650U may still be available for new designs, whereas the i7-8565U is being phased out.

Q: Which chip has a higher average benchmark score?

A: The i7-8650U has an average benchmark score of 8932, which is higher than the i7-8565U’s 8665. Both CPUs sit at the 65th percentile among all CPUs, but the i7-8650U’s overall average is about 3.1% higher.

Architecture Differences

The two processors come from different microarchitecture families despite sharing the same 14 nm process node and Intel as the foundry. The i7-8650U is built on Kaby Lake, with the codename Kaby Lake-R and the generation labeled "Core i7 (Kaby Lake-U Refresh)." In contrast, the i7-8565U uses Whiskey Lake architecture, with the codename Whiskey Lake-U and the generation "Core i7 (Whiskey Lake)." This architectural shift introduces several practical differences. The i7-8650U has a base clock of 1900 MHz, while the i7-8565U has a lower base clock of 1800 MHz. However, the i7-8565U compensates with a higher boost clock of 4.60 GHz versus 4.20 GHz on the i7-8650U. The die size also differs: the i7-8650U measures 123 mm², while the i7-8565U has no listed die size. Socket compatibility is different as well, with the i7-8650U using Intel BGA 1356 and the i7-8565U using Intel BGA 1528, meaning they are not interchangeable on the same motherboard.

Memory support is another differentiator. The i7-8650U only supports DDR4, whereas the i7-8565U supports both DDR3 and DDR4, giving the newer chip more flexibility for system integrators. The i7-8565U also lists a dual-channel memory bus and a memory bandwidth of 38.4 GB/s, while the i7-8650U provides no memory bus or bandwidth specifications. The i7-8565U additionally includes PCIe Gen 3 with 16 lanes (CPU only), a specification absent from the i7-8650U’s data. Integrated graphics are nearly identical—UHD 620 for the i7-8650U and UHD Graphics 620 for the i7-8565U—and both lack ECC memory support and unlocked multipliers. The release dates differ, with the i7-8650U launching on 2017-08-20 and the i7-8565U on 2018-09-30, and the i7-8565U has a launch MSRP of $409.

Head-to-Head Benchmarks

The head-to-head data shows a clear pattern: the i7-8650U dominates in multi-threaded and computational workloads, while the i7-8565U wins in single-threaded tests. In Cinebench R15, both CPUs score exactly 529 in multi-core and 74 in single-core, resulting in a tie (deltaPct 0%). Similarly, Cinebench R20 single-core is a tie at 311 points. The i7-8565U takes the lead in Cinebench R20 multi-core with 2208 vs 2206 (a 0.1% difference) and in Cinebench R23 multi-core with 5258 vs 5253 (also 0.1% ahead). The i7-8565U also wins Cinebench R23 single-core with 742 vs 741, a marginal 0.1% edge.

The PassMark suite tells a different story. The i7-8650U wins decisively in data compression (78936 vs 75995, 3.9% ahead) and data encryption (2067 vs 1993, 3.7% ahead). Extended instructions favor the i7-8650U by 5.7% (5042 vs 4770), which is the largest margin in any test. Floating point math goes to the i7-8650U at 13299 vs 12934 (2.8% ahead), and integer math shows a 2% lead (22007 vs 21581). The i7-8650U also wins multithread (6193 vs 5988, 3.4% ahead), physics (472 vs 458, 3.1% ahead), and random string sorting (10485 vs 10200, 2.8% ahead). Find prime numbers is a tie at 22. The only PassMark tests the i7-8565U wins are single-thread and singlethread, both at 2118 vs 2103, a 0.7% margin. Overall, the i7-8650U secures 12 wins versus 5 for the i7-8565U.

The Verdict

Based on the data, the Intel Core i7-8650U is the better choice for users prioritizing multi-threaded performance and compute-heavy tasks. Its wins in 12 of 17 benchmarks, including substantial margins in extended instructions (5.7%), data compression (3.9%), and multithread (3.4%), make it the stronger all-around performer for productivity workloads. The i7-8565U, while newer and featuring a higher boost clock, only manages to win in single-threaded tests and two Cinebench multi-core tests by negligible margins of 0.1%. For laptop buyers, the i7-8650U offers more consistent performance across a wider range of tasks, and its active production status means it may be easier to find in current systems. However, the i7-8565U’s higher single-thread score (2118 vs 2103) and its support for DDR3 memory could appeal to specific use cases where legacy memory is a requirement. The i7-8650U also has a higher average benchmark score (8932 vs 8665), reinforcing its overall performance advantage.

Specification Differences

The key specification differences between the two processors are clear. The base clock differs: 1900 MHz on the i7-8650U versus 1800 MHz on the i7-8565U. The boost clock is reversed, with the i7-8565U at 4.60 GHz and the i7-8650U at 4.20 GHz. Socket types are different, with the i7-8650U using Intel BGA 1356 and the i7-8565U using Intel BGA 1528. Architecture and codename differ, with the i7-8650U on Kaby Lake (Kaby Lake-R) and the i7-8565U on Whiskey Lake (Whiskey Lake-U). The die size is listed for the i7-8650U at 123 mm², while the i7-8565U has no die size data. Memory support varies, with the i7-8650U limited to DDR4 and the i7-8565U supporting both DDR3 and DDR4. The i7-8565U specifies a dual-channel memory bus and 38.4 GB/s bandwidth, while the i7-8650U lacks these details. PCIe support is only listed for the i7-8565U as Gen 3 with 16 lanes. Release dates differ: 2017-08-20 for the i7-8650U and 2018-09-30 for the i7-8565U. The i7-8565U has a launch MSRP of $409, while the i7-8650U has no listed MSRP. Production status is Active for the i7-8650U and End-of-life for the i7-8565U. The part numbers differ: SR3L8 for the i7-8650U and SREJPSRFFW for the i7-8565U.

Where Each One Wins

The Intel Core i7-8650U is the clear winner for multi-threaded and compute-intensive workloads. It excels in PassMark extended instructions with a 5.7% lead, data compression with a 3.9% advantage, and data encryption at 3.7% ahead. It also wins in multithread (3.4%), physics (3.1%), floating point math (2.8%), random string sorting (2.8%), and integer math (2%). These results make the i7-8650U the better choice for tasks like video encoding, 3D rendering, scientific calculations, and any workload that leverages multiple cores or advanced instruction sets. The i7-8650U also ties the i7-8565U in Cinebench R15 multi-core and single-core tests, as well as Cinebench R20 single-core, showing parity in older rendering benchmarks.

The Intel Core i7-8565U wins in single-threaded performance, taking the PassMark single-thread and singlethread tests with a 0.7% margin (2118 vs 2103). It also edges ahead in Cinebench R20 multi-core (2208 vs 2206) and Cinebench R23 multi-core (5258 vs 5253) by 0.1%, plus Cinebench R23 single-core (742 vs 741) by 0.1%. These wins are minimal, but they indicate that the i7-8565U has a slight edge in lightly-threaded applications like web browsing, office productivity, and older games that rely on a single core. The i7-8565U also offers memory flexibility with DDR3 support and a defined memory bandwidth of 38.4 GB/s, which could be an advantage for systems with legacy RAM. For users who prioritize raw single-thread speed or need DDR3 compatibility, the i7-8565U is the better pick, but the i7-8650U provides superior multi-threaded performance across the board.