Intel Core i7-8550U vs Intel Core i7-8565U Comparison

The Intel Core i7-8565U and the Intel Core i7-8550U are two 15-watt mobile processors aimed at thin-and-light laptops, separated by a single generation of Intel’s architecture. The data shows a remarkably consistent pattern: across every single benchmark recorded, the newer i7-8565U finishes ahead. With 17 benchmark wins to zero for the i7-8550U, the question is not whether the newer chip is faster, but exactly how much faster and in which workloads that advantage becomes meaningful.

Head-to-Head Benchmarks

The most striking aspect of this comparison is the uniformity of the results. The i7-8565U wins every head-to-head test, but the margin varies significantly depending on the workload. The Cinebench suite, which stresses pure CPU rendering, shows the largest gaps. In Cinebench R23 multi-core, the i7-8565U scores 5258 against 4926 for the i7-8550U, a 6.7% advantage. The single-core test tells a similar story: 742 versus 695, a 6.8% delta. This pattern repeats across the entire Cinebench family — R15 multi-core shows a 6.7% lead (529 vs 496), R20 multi-core a 6.8% lead (2208 vs 2068), and the single-core variants hover right around 6.9% to 7.2%. The largest single delta in the entire dataset is in Cinebench R15 single-core, where the i7-8565U leads by 7.2% (74 vs 69).

The PassMark suite, which includes more varied and often memory-bound tasks, shows a different picture. Here, the leads are more modest, typically in the 2% to 4% range. The biggest PassMark win for the i7-8565U is in single-threaded performance, where it scores 2118 versus 2021, a 4.8% lead. Integer math shows a 3.9% advantage (21581 vs 20770), while floating-point math is 3.3% ahead (12934 vs 12523). Data compression and encryption show smaller gains of 2.4% and 2.5%, respectively. The closest contest is in the find prime numbers test, where both chips score exactly 22, resulting in a 0% delta — a rare tie that suggests the workload is hitting a hard limit unrelated to clock speed or architecture.

The average benchmark score reflects this overall dominance: the i7-8565U averages 8665, while the i7-8550U averages 8407. This places the i7-8565U at the 65th percentile of all CPUs, one point higher than the i7-8550U’s 64th percentile. The nearest rival data puts these scores into perspective. For the i7-8565U, the closest competitor is the Intel Core i9-13900E, which scores 8676, just 0.1% higher. Interestingly, the i7-8550U’s nearest rival is the Intel Xeon Gold 5318N at 8433, which is 0.3% higher. This suggests both chips are clustered in a performance band where a single percentage point separates them from much larger desktop and server parts.

Where Each One Wins

Given that the i7-8565U wins every benchmark, the “where each one wins” section is more about the degree of victory than the direction. The data clearly shows that the i7-8565U’s advantage is largest in CPU-intensive rendering workloads. The Cinebench tests, which are highly sensitive to both clock speed and architecture efficiency, show consistent 6.7% to 7.2% leads. This makes the i7-8565U the clear choice for any task that involves sustained multi-core computation, such as video encoding, 3D rendering, or heavy spreadsheet calculations that leverage all eight threads.

The i7-8550U, while slower, is not dramatically so in every task. In the PassMark suite, the deltas shrink to the 1.6% to 4.8% range. For example, in the physics test, the i7-8565U leads by just 1.6% (458 vs 451). In data compression, the lead is 2.4%. This means that for everyday tasks like web browsing, office productivity, or light photo editing, the performance difference between the two chips would be difficult to perceive without a stopwatch. The i7-8550U’s strongest showing is in the find prime numbers test, where it ties the i7-8565U at 22, indicating that this particular workload is not improved by the newer architecture.

The single-threaded metrics are particularly telling. The i7-8565U’s 4.8% lead in PassMark single-thread (2118 vs 2021) is smaller than its Cinebench R23 single-core lead of 6.8%. This discrepancy suggests that the i7-8565U’s higher boost clock helps most when the workload is short and bursty, whereas longer single-threaded tasks see a more modest benefit. For users who prioritize raw responsiveness in applications that are not fully multi-threaded, the i7-8565U still wins, but the margin is less pronounced.

Architecture Differences

The fundamental difference between these two chips lies in their architecture and socket. The i7-8565U is built on Whiskey Lake, specifically the Whiskey Lake-U codename, while the i7-8550U uses Kaby Lake, with the Kaby Lake-R codename. Both are manufactured on Intel’s 14 nm process, so the transistor size is identical. The core counts are also the same: 4 cores and 8 threads each. The cache hierarchy is unchanged, with 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3 cache.

The most significant architectural difference is the boost clock. The i7-8565U has a boost clock of 4.60 GHz, while the i7-8550U tops out at 4.00 GHz. This 0.6 GHz advantage directly explains the consistent performance lead in single-threaded and lightly-threaded workloads. The base clock is identical at 1800 MHz for both, so the i7-8565U’s advantage is entirely dependent on its ability to reach and sustain higher boost frequencies under load. The data suggests that Whiskey Lake’s improved power management allows it to hit those higher clocks more effectively, even within the same 15-watt TDP envelope.

The socket changed from Intel BGA 1356 on the i7-8550U to Intel BGA 1528 on the i7-8565U. This means the chips are not physically interchangeable, and a laptop designed for one will not accept the other. The i7-8565U also lists PCIe Gen 3 with 16 lanes (CPU only), while the i7-8550U’s PCIe information is not provided in the data. Memory support differs as well: the i7-8565U supports both DDR3 and DDR4, while the i7-8550U only lists DDR4. The i7-8565U also specifies a dual-channel memory bus with 38.4 GB/s of bandwidth, while the i7-8550U’s memory bus and bandwidth fields are null. The integrated graphics are nearly identical, listed as UHD Graphics 620 for the i7-8565U and UHD 620 for the i7-8550U, which are effectively the same GPU.

The Verdict

The data is unambiguous: the Intel Core i7-8565U is the superior processor in every measured aspect. Its average benchmark score of 8665 is 3.1% higher than the i7-8550U’s 8407, and it wins all 17 head-to-head comparisons. The largest gains are in rendering workloads, where the 6.7% to 7.2% deltas in Cinebench are directly attributable to the 600 MHz higher boost clock. For users who run CPU-intensive applications, the i7-8565U is the clear choice.

However, the i7-8550U is not a poor performer. Its 64th percentile ranking places it in the same performance tier as the i7-8565U’s 65th percentile, and its nearest rivals include the Intel Xeon Gold 5318N, a server-class chip. In everyday productivity tasks, the 2% to 4% deltas in PassMark tests would be imperceptible to most users. The i7-8550U also remains in active production, while the i7-8565U is end-of-life, which could affect long-term availability and driver support.

The choice between these two chips should be driven by workload. If the laptop will be used for heavy multi-threaded tasks like video editing, 3D modeling, or software compilation, the i7-8565U’s consistent 6.8% lead in multi-core benchmarks justifies its selection. For general-purpose use where the laptop is primarily a web browser, document editor, and media player, the i7-8550U offers nearly identical real-world performance, and its active production status might make it easier to find in current systems. The i7-8565U’s launch MSRP is $409, which provides a reference point for its positioning, but the data alone shows it is the faster chip.

FAQ

Q: Is the Intel Core i7-8565U faster than the Intel Core i7-8550U in all benchmarks?

A: Yes. The i7-8565U wins all 17 recorded head-to-head benchmarks, with deltas ranging from 0% (find prime numbers) to 7.2% (Cinebench R15 single-core).

Q: What is the biggest performance difference between the two chips?

A: The largest delta is in Cinebench R15 single-core, where the i7-8565U scores 74 versus 69 for the i7-8550U, a 7.2% advantage. The Cinebench multi-core tests consistently show about a 6.7% lead.

Q: Do both processors have the same number of cores and threads?

A: Yes, both have 4 cores and 8 threads, with an identical cache layout of 64 KB L1 per core, 256 KB L2 per core, and 8 MB shared L3.

Q: What is the key clock speed difference?

A: The i7-8565U has a boost clock of 4.60 GHz, while the i7-8550U has a boost clock of 4.00 GHz. Their base clocks are both 1800 MHz.

Q: Are these chips interchangeable in laptops?

A: No. The i7-8565U uses the Intel BGA 1528 socket, while the i7-8550U uses the Intel BGA 1356 socket. They also belong to different architectures (Whiskey Lake vs Kaby Lake).

Q: Which chip has better memory support?

A: The i7-8565U supports both DDR3 and DDR4 with a dual-channel bus and 38.4 GB/s bandwidth. The i7-8550U only lists DDR4 support, with no bandwidth specification provided.

Specification Differences

| Field | Intel Core i7-8565U | Intel Core i7-8550U |

| :--- | :--- | :--- |

| Boost Clock | 4.60 GHz | 4.00 GHz |

| Socket | Intel BGA 1528 | Intel BGA 1356 |

| Architecture | Whiskey Lake | Kaby Lake |

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

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

| Process Node | 14 nm | 14 nm |

| Die Size | Not specified | 123 mm² |

| Memory Support | DDR3, DDR4 | DDR4 |

| Memory Bus | Dual-channel | Not specified |

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

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

| Integrated Graphics | UHD Graphics 620 | UHD 620 |

| Production Status | End-of-life | Active |

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

| Launch MSRP | $409 | Not specified |

| Part Number | SREJPSRFFW | SR3LC |