CPU Comparison

The Intel Core i9-13900E and the Intel Core i5-8265U represent two extreme ends of the Intel product stack: a 24-core desktop powerhouse built for sustained throughput and a 4-core mobile chip designed for efficiency in compact laptops. The benchmark data shows a decisive, one-sided contest, with the i9-13900E winning all six head-to-head comparisons by margins that exceed 660% in every test. The i5-8265U’s only statistical claim to relevance is its near-identical aggregate benchmark percentile, but the underlying scores reveal a chasm in raw performance.

Head-to-Head Benchmarks

The Cinebench suite delivers a consistent, brutal verdict. In Cinebench R23 multi-core, the i9-13900E scores 34,244 against the i5-8265U’s 4,482, a delta of 664%. The single-core result is similarly lopsided: 4,834 versus 632, a 664.9% advantage. These are not incremental gains; the i9-13900E is processing the same workload roughly 7.6 times faster in multi-threaded rendering, and the single-core margin indicates that even a single Raptor Lake performance core dwarfs a Whiskey Lake core.

The pattern holds across older Cinebench versions. In Cinebench R20 multi-core, the i9-13900E posts 14,382 versus 1,882 (664.2% delta), and single-core shows 2,030 versus 265 (666% delta). The R15 results are equally one-sided: multi-core 3,451 against 451 (665.2%), single-core 487 against 63 (673%). The i9-13900E’s smallest victory is still a 664% margin, which is not a close race but a categorical difference in compute capability.

The i5-8265U does appear in additional Passmark sub-tests not mirrored by the i9-13900E, but these are irrelevant for direct comparison. The data shows no test where the i5-8265U wins; it is winless across all six head-to-head benchmarks. The i9-13900E’s average benchmark score of 8,676 places it in the 65th percentile of all CPUs, while the i5-8265U’s average of 8,568 sits just one percentile lower at 64. This near-parity in percentile is a statistical artifact of the benchmark database’s weighting, not a reflection of comparable performance, the i9-13900E’s scores are spread across heavy multi-core workloads, whereas the i5-8265U’s average is pulled by its Passmark integer math and floating-point results, which are not in the head-to-head set.

FAQ

Q: Which processor is faster in multi-core rendering?

A: The Intel Core i9-13900E wins Cinebench R23 multi-core with a score of 34,244, which is 664% higher than the i5-8265U’s 4,482. The data shows a similar 664.2% margin in Cinebench R20 (14,382 vs. 1,882).

Q: Does the i5-8265U have any single-threaded advantage?

A: No. The i9-13900E leads in every single-core test, including a 664.9% advantage in Cinebench R23 single-core (4,834 vs. 632) and a 673% margin in Cinebench R15 single-core (487 vs. 63). The i5-8265U’s boost clock of 3.90 GHz cannot compensate for the architectural and core-count differences.

Q: Are these processors in the same performance class based on their benchmark percentiles?

A: The i9-13900E sits at the 65th percentile of all CPUs, while the i5-8265U is at the 64th. However, this is misleading for direct comparison because the i9-13900E’s average score of 8,676 is driven by Cinebench results, while the i5-8265U’s average of 8,568 includes Passmark scores that are not part of the head-to-head tests. The head-to-head data shows a 664% or greater delta in every paired test.

Q: What is the i5-8265U’s closest rival according to the data?

A: The nearest rivals for the i5-8265U include the Intel Core i5-8250U (deltaPct -0.1%), Intel Core i7-10510U (deltaPct -0.1%), AMD EPYC 7601 (deltaPct -0.6%), and Intel Pentium Gold G7400 (deltaPct 0.6%). These are all within 0.6% of its average score, indicating the i5-8265U is not an outlier but a typical mid-range mobile chip from its era.

Q: Is the i9-13900E’s performance advantage consistent across all Cinebench versions?

A: Yes. The deltaPct values are remarkably consistent: 665.2% (R15 multi), 673% (R15 single), 664.2% (R20 multi), 666% (R20 single), 664% (R23 multi), and 664.9% (R23 single). The i9-13900E maintains roughly a 6.6x to 6.7x lead across all versions.

Architecture Differences

The two processors are built on entirely different silicon. The i9-13900E uses the Raptor Lake architecture (codename Raptor Lake-S) on a 10 nm process node from Intel, producing a die size of 257 mm². The i5-8265U is a Whiskey Lake part (codename Whiskey Lake-U) built on Intel’s older 14 nm node, with no die size listed in the data. The process node difference is a foundational gap: the 10 nm node allows for a much higher transistor density and power efficiency, which directly enables the i9-13900E’s 24 cores and 32 threads.

The i9-13900E features 80 KB of L1 cache per core and 2 MB of L2 cache per core, with a shared 36 MB L3 cache. The i5-8265U has 64 KB of L1 per core, 256 KB of L2 per core, and only 6 MB of shared L3. The i9-13900E’s L3 cache is six times larger, which is critical for feeding its 24 cores without memory stalls. The i5-8265U’s cache hierarchy is sized for a 4-core design, and the smaller L2 per core (256 KB vs. 2 MB) means each core has less private working set capacity.

The i9-13900E supports DDR4 and DDR5 memory over a dual-channel bus, while the i5-8265U is limited to DDR4. The i9-13900E also supports ECC memory, which the i5-8265U does not. PCIe connectivity differs: the i9-13900E provides Gen 5 with 16 lanes (CPU only), whereas the i5-8265U offers Gen 3 with 16 lanes. The integrated graphics also differ, with the i9-13900E packing UHD Graphics 770 against the i5-8265U’s UHD Graphics 620.

The production statuses reflect their lifecycles: the i9-13900E is marked as Active, while the i5-8265U is End-of-life. The release dates are separated by over four years, with the i9-13900E launching on 2023-01-03 and the i5-8265U on 2018-09-30. The i9-13900E is a desktop part on Intel Socket 1700, while the i5-8265U is a mobile chip on Intel BGA 1528, making them physically incompatible.

Specification Differences

The core and thread counts are the most glaring difference: the i9-13900E has 24 cores and 32 threads, while the i5-8265U has 4 cores and 8 threads. Base clocks are 1800 MHz for the i9-13900E and 1600 MHz for the i5-8265U, but the boost clocks diverge sharply: 5.20 GHz for the i9-13900E versus 3.90 GHz for the i5-8265U. The i9-13900E has a TDP of 65 watts, while the i5-8265U is rated at just 15 watts, a 4.3x difference in power envelope.

The cache configuration differs as detailed above, with the i9-13900E offering 80 KB L1 per core, 2 MB L2 per core, and 36 MB shared L3, versus the i5-8265U’s 64 KB L1, 256 KB L2, and 6 MB L3. Memory support is another split: the i9-13900E supports DDR4 and DDR5, while the i5-8265U only supports DDR4. The i5-8265U is listed with a memory bandwidth of 38.4 GB/s, a figure not provided for the i9-13900E. ECC support is present on the i9-13900E but absent on the i5-8265U.

The socket and market segment are fundamentally different: Intel Socket 1700 desktop versus Intel BGA 1528 mobile. The process node differs (10 nm vs. 14 nm), and the part numbers are distinct (SRMG2 for the i9-13900E, SRFFXSREJQSREJR for the i5-8265U). The i5-8265U has a launch MSRP of $297, which can be stated once as its launch MSRP; the i9-13900E has no launch MSRP listed. Both processors have locked multipliers.

The Verdict

The data is unambiguous: the Intel Core i9-13900E is the superior processor by every measured metric. It wins all six head-to-head benchmarks with a minimum delta of 664%, and the architecture provides a six-fold increase in core count, a 1.7x higher boost clock, and a 4.3x higher TDP to sustain that performance. Anyone selecting between these for a desktop workload, rendering, compilation, or any multi-threaded application, should choose the i9-13900E without hesitation.

The i5-8265U’s sole virtue is its 15-watt TDP, which makes it suitable for thin-and-light laptops, and its nearly identical average benchmark percentile (64 vs. 65) relative to all CPUs. But that percentile is a database artifact; in direct comparison, the i5-8265U is not merely slower but categorically outclassed. The i9-13900E is an active, current-generation desktop part, whereas the i5-8265U is an end-of-life mobile chip with a 2018 release date. If the workload is mobile and power-constrained, the i5-8265U is the only feasible choice due to its BGA socket and 15-watt envelope, but the benchmark data offers no performance-based reason to prefer it. For any scenario where the i9-13900E can be installed, it is the definitive winner.