Intel Core i7-8565U vs Intel Core i9-13900E Comparison

Head-to-Head Benchmarks

The benchmark data presents an absolute sweep for the Intel Core i9-13900E, winning all six shared tests with a staggering margin. In Cinebench R15 multicore, the i9-13900E scores 3451 against the i7-8565U’s 529, a delta of 552.4%. The single-core result is even more lopsided in percentage terms: 487 versus 74, giving the i9-13900E a 558.1% advantage. These are not incremental gains; they represent a generational chasm in raw performance.

Moving to Cinebench R20, the pattern holds with identical severity. The multicore test shows 14382 for the i9-13900E versus 2208 for the i7-8565U, a 551.4% delta, while single-core scores of 2030 and 311 translate to a 552.7% gap. The i9-13900E delivers over six times the multicore throughput, which is the kind of result that changes how you plan a workstation build. There is no nuance here — the i7-8565U is not competitive in any rendering workload.

The Cinebench R23 results reinforce the trend. Multicore: 34244 against 5258, a 551.3% delta. Single-core: 4834 against 742, a 551.5% delta. The i9-13900E’s single-core score alone is nearly as high as the i7-8565U’s multicore score, which illustrates how far the architecture has advanced. For any task that scales with threads — video encoding, 3D rendering, compilation — the i9-13900E is not just faster; it is in a different performance class entirely.

It is notably the aggregate benchmark averages tell a different story. The i9-13900E has an avgBenchmarkScore of 8676, while the i7-8565U sits at 8665, a negligible 0.1% difference. This is because the i7-8565U’s benchmark suite includes PassMark tests where it posts respectable numbers, such as 21581 in integer math and 12934 in floating-point math, while the i9-13900E’s data only includes Cinebench and Geekbench results. The head-to-head tests, however, are unambiguous: the i9-13900E wins every single one with deltas above 550%.

Architecture Differences

The architectural gap between these two processors is fundamental. The Intel Core i9-13900E is built on Raptor Lake-S with a 10 nm process node, while the Intel Core i7-8565U uses Whiskey Lake-U on a 14 nm node. That process advantage alone explains a significant portion of the performance disparity, as the newer node allows for higher clock speeds and better power efficiency per transistor.

Core counts differ dramatically. The i9-13900E packs 24 cores and 32 threads, whereas the i7-8565U offers just 4 cores and 8 threads. That is a 6x increase in core count and a 4x increase in thread count. The cache hierarchy reflects this scale: the i9-13900E has 80 KB of L1 per core and 2 MB of L2 per core, with 36 MB of shared L3. The i7-8565U has 64 KB of L1 per core, 256 KB of L2 per core, and only 8 MB of shared L3. The i9-13900E’s L3 cache alone is 4.5 times larger than the i7-8565U’s total cache budget.

Clock speeds also favor the newer part. Both start at a base clock of 1800 MHz, but the i9-13900E boosts up to 5.20 GHz, while the i7-8565U tops out at 4.60 GHz. The boost clock difference of 600 MHz is substantial, especially for single-threaded workloads that rely on frequency headroom.

Memory support and I/O are another differentiator. The i9-13900E supports DDR4 and DDR5 memory in a dual-channel configuration, while the i7-8565U supports DDR3 and DDR4. The i9-13900E also supports ECC memory, which the i7-8565U does not. PCIe connectivity leaps from Gen 3 on the i7-8565U to Gen 5 on the i9-13900E, with both offering 16 CPU lanes. Integrated graphics differ as well: the i9-13900E includes UHD Graphics 770, while the i7-8565U has UHD Graphics 620.

The socket situation could not be more different. The i9-13900E uses Intel Socket 1700 for desktop builds, while the i7-8565U is a mobile part on Intel BGA 1528. The i9-13900E has a 65 W TDP versus the i7-8565U’s 15 W TDP, which reflects the desktop versus mobile design philosophy. Production status also diverges: the i9-13900E is active, while the i7-8565U is end-of-life. The i9-13900E was released in January 2023, and the i7-8565U launched in September 2018.

FAQ

Q: Which processor is faster in single-core workloads?

A: The Intel Core i9-13900E wins every single-core benchmark in the head-to-head data. In Cinebench R23 single-core, it scores 4834 versus 742 for the i7-8565U, a 551.5% delta. The i9-13900E’s boost clock of 5.20 GHz versus 4.60 GHz on the i7-8565U contributes heavily to this result.

Q: How do the two compare in multicore rendering?

A: The i9-13900E is overwhelmingly faster. In Cinebench R23 multicore, it scores 34244 against 5258 for the i7-8565U, a 551.3% delta. With 24 cores and 32 threads versus 4 cores and 8 threads, the i9-13900E is designed for heavy parallel workloads, while the i7-8565U is not.

Q: Do both processors support the same memory types?

A: No. The i9-13900E supports DDR4 and DDR5 in dual-channel mode, while the i7-8565U supports DDR3 and DDR4. The i9-13900E also adds ECC memory support, which the i7-8565U lacks entirely.

Q: Are these processors interchangeable in a system?

A: No. The i9-13900E uses Intel Socket 1700 and is a desktop processor, while the i7-8565U uses Intel BGA 1528 and is a mobile processor. They are physically incompatible and target entirely different market segments — desktop versus mobile.

Q: What is the production status of each CPU?

A: The i9-13900E is marked as active production, while the i7-8565U is end-of-life. The release dates reflect this: the i9-13900E came out in January 2023, and the i7-8565U launched in September 2018.

Q: Does the i7-8565U have any benchmark advantage?

A: In the head-to-head tests, the i7-8565U wins zero of six benchmarks. However, its aggregate benchmark average of 8665 is nearly identical to the i9-13900E’s 8676, a 0.1% difference, because the i7-8565U’s test suite includes PassMark results that are not present in the i9-13900E’s data.

Specification Differences

The specifications diverge on nearly every measurable field. Core count is the most obvious split: the i9-13900E has 24 cores and 32 threads, versus 4 cores and 8 threads on the i7-8565U. Both have a base clock of 1800 MHz, but the boost clock differs — 5.20 GHz for the i9-13900E and 4.60 GHz for the i7-8565U. The TDP is 65 W for the desktop part and 15 W for the mobile part.

The process node is 10 nm for the i9-13900E and 14 nm for the i7-8565U. Cache configurations are entirely different: the i9-13900E has 80 KB L1 per core, 2 MB L2 per core, and 36 MB shared L3, while the i7-8565U has 64 KB L1 per core, 256 KB L2 per core, and 8 MB shared L3. Memory support sees the i9-13900E accept DDR4 and DDR5, whereas the i7-8565U accepts DDR3 and DDR4. The i9-13900E supports ECC memory; the i7-8565U does not.

PCIe capabilities move from Gen 3 on the i7-8565U to Gen 5 on the i9-13900E, with both providing 16 CPU lanes. Integrated graphics are UHD Graphics 770 on the i9-13900E and UHD Graphics 620 on the i7-8565U. The socket is Intel Socket 1700 versus Intel BGA 1528, reflecting desktop versus mobile designs. The i9-13900E has a die size of 257 mm², while the i7-8565U’s die size is not listed. Production status is active for the i9-13900E and end-of-life for the i7-8565U. The i7-8565U has a launch MSRP of $409; the i9-13900E has no launch MSRP listed.

Where Each One Wins

The Intel Core i9-13900E wins every benchmark where both processors were tested. Its six head-to-head victories cover Cinebench R15, R20, and R23 in both single-core and multicore configurations. For workloads that rely on raw CPU throughput — 3D rendering, video encoding, scientific computation, software compilation — the i9-13900E is the clear choice. Its 24 cores and 32 threads provide massive parallel processing capability, and the 5.20 GHz boost clock ensures strong single-threaded performance for lighter tasks.

The Intel Core i7-8565U has no benchmark victories in the head-to-head data. However, its 15 W TDP makes it suitable for thin-and-light laptops where battery life and thermal constraints are paramount. Its mobile BGA 1528 socket means it is soldered into motherboards, so it wins in scenarios where a low-power, integrated mobile solution is required. The PassMark results in its benchmark suite, such as 21581 in integer math and 12934 in floating-point math, show it can handle everyday productivity tasks without issue — just not at the scale of the i9-13900E.

The aggregate benchmark averages are nearly identical — 8676 for the i9-13900E and 8665 for the i7-8565U — but this is misleading. The i9-13900E’s average is based on Cinebench and Geekbench data, while the i7-8565U’s includes additional PassMark tests. In the shared test categories, the i9-13900E dominates completely.

The Verdict

The data makes the choice straightforward for most users. The Intel Core i9-13900E is the superior processor in every head-to-head benchmark, with deltas exceeding 550% across all six tests. It offers 24 cores, 32 threads, a 5.20 GHz boost clock, DDR5 support, ECC memory, PCIe Gen 5, and a 36 MB L3 cache. This is a desktop powerhouse for anyone building a workstation that handles rendering, compilation, or other multi-threaded workloads. Its 65 W TDP is reasonable for a desktop part, and its active production status means it remains a viable purchase.

The Intel Core i7-8565U is not a competitor in performance terms. Its 4 cores and 8 threads, 14 nm process, 8 MB L3 cache, and 15 W TDP place it firmly in the mobile efficiency category. It is end-of-life, uses a soldered BGA 1528 socket, and supports only DDR3 and DDR4 memory. Its single advantage is power consumption — at 15 W, it is suited for battery-powered laptops where the i9-13900E’s 65 W TDP would be impossible to cool or power.

For a desktop builder seeking maximum performance, the i9-13900E is the only rational choice from this comparison. For someone looking at an ultraportable laptop, the i7-8565U serves a purpose, but it cannot be recommended for any performance-sensitive task. The benchmark results are decisive: six wins for the i9-13900E, zero for the i7-8565U, with no close calls. The i7-8565U’s only consolation is its launch MSRP of $409, but the i9-13900E’s lack of a published MSRP and its overwhelming performance make the newer part the clear winner in any scenario where performance matters.